WE ARE BLESSED some very talented individuals Precision Aerobatics community may aware Frank Williams Houston Texas Frank Sally Williams ably hosted CDd Houston contests including FAI team race team selections Besides being very talented flier always top twenty Continued page 173 - -o SEAIJ DHING LINE~1 0 --7Co 0 E JHfiIGE LAE o - - - Results Frank Williams wind tunnel tests Frank aeronautical engineer currently working NASAs Space Shuttle pro gram looked stab/elevator combinations saw some very inter esting phenomena See text detailed explanation Allen Brickhauss Arcturus ready go 1991 season An OS V Max 40 tuned pipe powers 64-oz 675 sq beauty Stuart Richmond sent photos Deifin 22 belonging Czechoslovakias top rated flier Viadisial Trnka Engine probably Tom Dixon Merco 61 Delfin breaks down transport June 1991 55 [Lttx Aerobatics Frank McMiIIan 12108 Gunter Grove San Antonio TX 78231 Windy Urtnowskis new Cardinal built PSP plans drawn Steve Buso Big Jim St-60 pipe engine lots goodies Windys Pro Stunt Products gorgeous ship STAB / ELEVATOR EFFICIENCY OPEN HINGE LINE VERSUS SEALED TAB- LEV6CHORL 3 THICKNES / TUNNEL VELOCITY 50MPH PEN C P 1t32 0 051015202530354045 ELEVATOR DEFLECTION DEGREES rest room food concession facilities field might make weekend part vacation lodging entertainment within ten minute drive field special interest readers column fact included 30 events flown Precision Sport Profile Scale full details super weekend contest please contact John Thompson 1145 Birch Avenue Cottage Grove Oregon 97424 Tel 503/942-7324 Rocky Mountain CL Championships held Saturday Sunday July 6 7 will also twoday meet Barbecue Saturday night Sport Profile Scale events will flown Sunday 7th full details meet write Gerald Deneau 6464 South Andes Place Aurora Colorado 80016 Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column CL Aerobatics/McMiIIan Continued page 55 several times top ten Frank Aeronautical Engineer working NASA Space Shuttle program About year ago Frank acquired portable wind tunnel has performed some experiments will interesting us SAMS MODELS SPITFIRE England13 or26 span Europes lead ng F ee F ght V ntage specialist SAMS 1600 Item catalog FREE Send $2 postage SAMS Chapel Sandon Herts SG9 OQJ England NOTE $ billsfVISA/ Master Card hecks & stamps valid England Heres account set evenings last winter Mike Denton spent little bit time looking stab/elevator combinations wind tunnel looked several different combinations shapes hinge line geometries saw some fairly interesting phenomena should reported some time time being though heres plot effect simple hinge line seal effectiveness relatively common stab/elevator shape begin tunnel has about 12 diameter test section capable producing velocity about 50 mph eight foot long tunnel powered hp motor straightening vanes screen mesh contraction section Its kind thing might find high school physics lab balance two component mechanical measuring lift drag measures nearest 01 pounds flow laminar might ultimately like its bad either its certainly lot better sitting shop guessing what might happening flow around section question expand moment lot experimental data wing sections control surfaces etc text books Unfortunately data isnt applicable modeler since derived Reynolds numbers velocities chord lengths far III SS00 Antque Mita y CviIiar Helicopters Sailpisnes I3Ous5553iewa~riasI IcrFOTO-PMKSkcIuingKOKUPANI I75P0 cATAL sunsI SHIPPING & HANDLING UPS Ground Contineetal US $495 UPS Air & Parcel Post $495 pIus 1 00k Subtotal IContinental US UPS Next Day Air $1400 plus $100 per lb Shipment total COD add $395 Foreign Orders Parcel Post Air $495 * 20% Subtotal US Mail $495 plus 10% Subtotal June 1991 173 WHY TAKE THE CHANCE OF DESTROYING YOUR MASTERPIECE WITH INFERIOR MASKING TAPE THINK ABO UT iT OUR KITS CONTAIN THE FINEST MASKING & FINE-LINE TAPE AVAILABLE ANYWHERE WE OFFER YOU PERFECTION DISCOVER THE ART OF MASKING MASKING MASTER $2525 MASKING MASThH9 II $1925 TECHTAPE MASKING TECHNOLOGY UREA TED FOR MODELERS BY MODELERS SATISFACTION GUARANTEED OR MONEY BACK SEE OUR OTHER AD IN THIS ISSUE PENETRATE THE SKY LanDer RCs DART GOOD FLYING SPORT AEROBATIC MODEL ITS ARF THATS MADE IN THE USA Fuselage Length 42Wing Span 63 Rec Engine Size 40-60 4 Stroke 80-90Area 630 sq Flying Weight 6 lbsRadio Channels 4 Send SASE free color catalog Phone 404-532-6401 900 530 EST M-F Lanier RC PO Box 458 Oakwood GA 30566 above what use However applicable data out look RPVs recoverable pilotless aircraft wind turbine research has begun appear some data close needs addition RC soaring community has sponsored some low Reynolds number experiments theoretical work recently Herk Stokely editor soaring column Flying Models publishes semi regular paper called Soar Tech covers some excellent technical topics dont know National Free Flight Society has published annual symposium report last 23 years covers low-speed aerodynamic subjects topics although may look little different certainly transferable Control Line applications However always cases like typical stunt ship stab elevator elevator deflection 45 degrees no us will ever very interested cases like having tunnel FAX 404-532-2163 garage going great advantage ever get time use tail section tests installed pair parallel plates section about three inches apart plates would allow approximate easily two dimensional flow field test sections made three inches wide just enough span test area stabs three inches length elevators also three inches long Thus overall chord length test article six inches span three inches test section Im going tell about made simply /8 sheet balsa leading edge stab slightly tapered rounded necessarily wedge shape slightly tapered about A6 diameter leading edge contour elevator triangular leading edge simple straight line taper trailing edge original open hinge line model Concours gaPthan lessa /32 almost visible unless held up light what really blew away youll see chart gap really better competent modelers usually build really didnt expect gain sealed tape bottom side tests simply measure lift drag section various settings elevator five degrees attitude stabilizer varied aligned parallel tunnel axis tests figure indicates fairly normal variation lift coefficient versus elevator deflection open hinge line model As measure confidence tunnel balanc3-the curve very close data other sources sealed hinge line model significant improvement can seen 200 deflection sealed section produces much lift unsealed section will ever generate 45 0 deflection Past 250 deflection sealed section falls off lift approaches magnitude unsealed 450 250 particular section sealed configuration produces about 25% lift unsealed section deflection Certainly something consider think felt beginning flier field 3/ control surface gap Tudor likely giving something away nice tight gap pro stunt a/c probably losing couple percent Better think again may performance As said earlier low Reynolds numbers some very interesting things happenphenomena quite unique model airplane aerodynamics particular sheet slab section moderate higher lift coefficients possessed laminar separation bubble leading edge stabilizer could seen inserting wire streamer thread test section area just downstream leading edge flow would separate bubble about inch reattach surface side effect bubble reattachment mother nature tries reshape flow pattern really Continued page 176 j Fults Tooling 174 Model Aviation HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT LTATONE PRODUCTS CORP Available dealer Made Amenca wait Amerleon Teehiwlogy RJL K61 Feetsea Include Single Ring Forged Piston investment Ceat Crankcase &hnueie Porting Double Ball Swings Forged Rod Bushed Both Ends Machined LaIesr sampurwr LOflcW~UU cuupmUnr HP VT2J & VT49 Four Cycle Made Austna hudwcries Features Include Double 81/Bearings ABC Overhead Rotary Valves supported roller bearings Forged Rod Bushed both ends Ringed ABC Piston/Cylinder true chrome HP Gold Cup 61 ABC Also Available 20 40 Sizes 61 Hell ringed 40& 61 rear intake Marine versions Features Include Schnuerle Porting Double Ball Bearings Slide Valve Carburetor Forged Rod ed both ends ABC Piston/C vlinder true chrome Wntage Forster Glow & Ignition very low production engine produced America Sold factory direct Glow $9500Ignition $13500 choice 29 38 Add $300 S&il CA Residents add tax 4-6 weak delivery FACTORY PARTS & SERVICE FOR HB ENGINES- RJL ENGINES- HP ENGINES KRAFT 61 Cox CONQUEST 15 TAIPAN 40 HGK ENGINES- FORSTER ENGINES MCCOY SERIES 21 SLACK HEAD FINNED CASE CALL OR WRFIE FOR FREE INFORMATION RJL INDUSTRIES USA PO Box5 SIERRA Mwr CA 91025 TELEPHONE 818 359-0016 fr & MODEL BUILDING 7SERVICE RADIO CONT1OL PROOUCI3 carry full line Byron Originals Bob Parkerson Tom Cook Bob Violet products COD Orders Accepted 718 983-9735 128 WATCHOGUE tOAD EN SlAt-f 0314 wants produce turbulent boundary layer downstream attachment delay flow separation later surface nicely contoured NACA 0010 section actually slightly poorer performance slab sheet section Theres still lot learned going build new stab/elevator right now what kind would build No question about light Builder Model Rule has few rules event has remained unchanged least intent since start certainly does imply cannot should changed Over last few years opinions have stated privately press over validity relevance long-standing part event given reality busy modern life has become common local contests permit fliers enter planes comply BOM provided waive appearance points opinion good circumstance event general promotes fliers competing people get flying better off event will now future note endorsement unofficial stops local contests National Event Directors have knowingly permitted violations BOM nor should rule effect Further participants sign names enter stating will comply rules written Therefore rationalization anyone simply valid Realize points intentionally left unsaid perhaps time surface issue again deal course its companion appearance points BOM dropped appearance points go also no good way enforce can see argument facilitating greatest participation good buy has certainly helped RC legal few community would want supply finished competitive planes Thats positive Bottom line Precision Aerobatics community want away BOM get together work official rules process change rules Ive flying stunt thirty-nine years has always basic topic has stood test believe event has endured part because BOM has required competitors persevere achieve high standards Like old friend Ill hate see go year Northwest Regionals reputation largest finest CL meeting grows grows Held permanent CL site Eugene Oregon Airport features three asphalt four grass circles meet includes virtually competitive events year its May 25 26 Contact John Thompson 1145 Birch Ave Cottage Grove Oregon 97424 Tel 503/942-7324 details D CL Navy Carrier/Perry Continued page 56 required forward cockpit rear cockpit turtledeck formed -in balsa forward fuselage kept full depth A-in pieces added expand plywood doublers same height balsa outline cut resemble radial cowl prototype few additional pieces /8-in balsa around nose some sandpaper complete radial engine illusion horizontal stabilizer elevator cut hard %-in balsa n spruce piece hinge line hold dacron thread hinges spruce elevator section spans full width tail connects two halves elevator vertical stabilizer formed A-in balsa added strength Ive kept text short month allow photographs XS2C-l model would happy hear anyone wishes try XS2C-l conversion Sig Skyray will provide full-size outlines wingtips horizontal stabilizer elevator fuselage vertical stabilizer plus threeview drawing prototype XS2C-l bonus point documentation Cost package five dollars Theres still plenty time prepare Nationals Control Line flight areas have paved since last year flying conditions should considerably improved hope see D hi EIectri~g money back Adjustable silchlog polst Solderless lenolnal toe easy hookup ___ ON/OFF Controller ower save weIght very hIgh etficlency 006V loss 20 Sloe 22x13x63 Add SlOt shippio0 cslifoodrcidosodd 725%5217Ts Send Check money order coumoisi h Sky taIoosooo3929 Kansas St #9 obe~ooeSan DlegoCA 92104•- TELLITE FREE FLIGHT KITS ~Oo/o off ad 26 /A Gas 320 Gas 450 A-B Gas 788 B-C-fl Gas 788 8-C-fl Gas Full Kit $2795 Full Kit $3095 Fu K $4295 PoKI $4795 Fu Kt $6795 rnd 4~muhiIhuIsU CA OG P M vrlip U 0Ps Add $3 95 SP p 176 Model Aviation
Edition: Model Aviation - 1991/06
Page Numbers: 55, 173, 174, 176
WE ARE BLESSED some very talented individuals Precision Aerobatics community may aware Frank Williams Houston Texas Frank Sally Williams ably hosted CDd Houston contests including FAI team race team selections Besides being very talented flier always top twenty Continued page 173 - -o SEAIJ DHING LINE~1 0 --7Co 0 E JHfiIGE LAE o - - - Results Frank Williams wind tunnel tests Frank aeronautical engineer currently working NASAs Space Shuttle pro gram looked stab/elevator combinations saw some very inter esting phenomena See text detailed explanation Allen Brickhauss Arcturus ready go 1991 season An OS V Max 40 tuned pipe powers 64-oz 675 sq beauty Stuart Richmond sent photos Deifin 22 belonging Czechoslovakias top rated flier Viadisial Trnka Engine probably Tom Dixon Merco 61 Delfin breaks down transport June 1991 55 [Lttx Aerobatics Frank McMiIIan 12108 Gunter Grove San Antonio TX 78231 Windy Urtnowskis new Cardinal built PSP plans drawn Steve Buso Big Jim St-60 pipe engine lots goodies Windys Pro Stunt Products gorgeous ship STAB / ELEVATOR EFFICIENCY OPEN HINGE LINE VERSUS SEALED TAB- LEV6CHORL 3 THICKNES / TUNNEL VELOCITY 50MPH PEN C P 1t32 0 051015202530354045 ELEVATOR DEFLECTION DEGREES rest room food concession facilities field might make weekend part vacation lodging entertainment within ten minute drive field special interest readers column fact included 30 events flown Precision Sport Profile Scale full details super weekend contest please contact John Thompson 1145 Birch Avenue Cottage Grove Oregon 97424 Tel 503/942-7324 Rocky Mountain CL Championships held Saturday Sunday July 6 7 will also twoday meet Barbecue Saturday night Sport Profile Scale events will flown Sunday 7th full details meet write Gerald Deneau 6464 South Andes Place Aurora Colorado 80016 Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column CL Aerobatics/McMiIIan Continued page 55 several times top ten Frank Aeronautical Engineer working NASA Space Shuttle program About year ago Frank acquired portable wind tunnel has performed some experiments will interesting us SAMS MODELS SPITFIRE England13 or26 span Europes lead ng F ee F ght V ntage specialist SAMS 1600 Item catalog FREE Send $2 postage SAMS Chapel Sandon Herts SG9 OQJ England NOTE $ billsfVISA/ Master Card hecks & stamps valid England Heres account set evenings last winter Mike Denton spent little bit time looking stab/elevator combinations wind tunnel looked several different combinations shapes hinge line geometries saw some fairly interesting phenomena should reported some time time being though heres plot effect simple hinge line seal effectiveness relatively common stab/elevator shape begin tunnel has about 12 diameter test section capable producing velocity about 50 mph eight foot long tunnel powered hp motor straightening vanes screen mesh contraction section Its kind thing might find high school physics lab balance two component mechanical measuring lift drag measures nearest 01 pounds flow laminar might ultimately like its bad either its certainly lot better sitting shop guessing what might happening flow around section question expand moment lot experimental data wing sections control surfaces etc text books Unfortunately data isnt applicable modeler since derived Reynolds numbers velocities chord lengths far III SS00 Antque Mita y CviIiar Helicopters Sailpisnes I3Ous5553iewa~riasI IcrFOTO-PMKSkcIuingKOKUPANI I75P0 cATAL sunsI SHIPPING & HANDLING UPS Ground Contineetal US $495 UPS Air & Parcel Post $495 pIus 1 00k Subtotal IContinental US UPS Next Day Air $1400 plus $100 per lb Shipment total COD add $395 Foreign Orders Parcel Post Air $495 * 20% Subtotal US Mail $495 plus 10% Subtotal June 1991 173 WHY TAKE THE CHANCE OF DESTROYING YOUR MASTERPIECE WITH INFERIOR MASKING TAPE THINK ABO UT iT OUR KITS CONTAIN THE FINEST MASKING & FINE-LINE TAPE AVAILABLE ANYWHERE WE OFFER YOU PERFECTION DISCOVER THE ART OF MASKING MASKING MASTER $2525 MASKING MASThH9 II $1925 TECHTAPE MASKING TECHNOLOGY UREA TED FOR MODELERS BY MODELERS SATISFACTION GUARANTEED OR MONEY BACK SEE OUR OTHER AD IN THIS ISSUE PENETRATE THE SKY LanDer RCs DART GOOD FLYING SPORT AEROBATIC MODEL ITS ARF THATS MADE IN THE USA Fuselage Length 42Wing Span 63 Rec Engine Size 40-60 4 Stroke 80-90Area 630 sq Flying Weight 6 lbsRadio Channels 4 Send SASE free color catalog Phone 404-532-6401 900 530 EST M-F Lanier RC PO Box 458 Oakwood GA 30566 above what use However applicable data out look RPVs recoverable pilotless aircraft wind turbine research has begun appear some data close needs addition RC soaring community has sponsored some low Reynolds number experiments theoretical work recently Herk Stokely editor soaring column Flying Models publishes semi regular paper called Soar Tech covers some excellent technical topics dont know National Free Flight Society has published annual symposium report last 23 years covers low-speed aerodynamic subjects topics although may look little different certainly transferable Control Line applications However always cases like typical stunt ship stab elevator elevator deflection 45 degrees no us will ever very interested cases like having tunnel FAX 404-532-2163 garage going great advantage ever get time use tail section tests installed pair parallel plates section about three inches apart plates would allow approximate easily two dimensional flow field test sections made three inches wide just enough span test area stabs three inches length elevators also three inches long Thus overall chord length test article six inches span three inches test section Im going tell about made simply /8 sheet balsa leading edge stab slightly tapered rounded necessarily wedge shape slightly tapered about A6 diameter leading edge contour elevator triangular leading edge simple straight line taper trailing edge original open hinge line model Concours gaPthan lessa /32 almost visible unless held up light what really blew away youll see chart gap really better competent modelers usually build really didnt expect gain sealed tape bottom side tests simply measure lift drag section various settings elevator five degrees attitude stabilizer varied aligned parallel tunnel axis tests figure indicates fairly normal variation lift coefficient versus elevator deflection open hinge line model As measure confidence tunnel balanc3-the curve very close data other sources sealed hinge line model significant improvement can seen 200 deflection sealed section produces much lift unsealed section will ever generate 45 0 deflection Past 250 deflection sealed section falls off lift approaches magnitude unsealed 450 250 particular section sealed configuration produces about 25% lift unsealed section deflection Certainly something consider think felt beginning flier field 3/ control surface gap Tudor likely giving something away nice tight gap pro stunt a/c probably losing couple percent Better think again may performance As said earlier low Reynolds numbers some very interesting things happenphenomena quite unique model airplane aerodynamics particular sheet slab section moderate higher lift coefficients possessed laminar separation bubble leading edge stabilizer could seen inserting wire streamer thread test section area just downstream leading edge flow would separate bubble about inch reattach surface side effect bubble reattachment mother nature tries reshape flow pattern really Continued page 176 j Fults Tooling 174 Model Aviation HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT LTATONE PRODUCTS CORP Available dealer Made Amenca wait Amerleon Teehiwlogy RJL K61 Feetsea Include Single Ring Forged Piston investment Ceat Crankcase &hnueie Porting Double Ball Swings Forged Rod Bushed Both Ends Machined LaIesr sampurwr LOflcW~UU cuupmUnr HP VT2J & VT49 Four Cycle Made Austna hudwcries Features Include Double 81/Bearings ABC Overhead Rotary Valves supported roller bearings Forged Rod Bushed both ends Ringed ABC Piston/Cylinder true chrome HP Gold Cup 61 ABC Also Available 20 40 Sizes 61 Hell ringed 40& 61 rear intake Marine versions Features Include Schnuerle Porting Double Ball Bearings Slide Valve Carburetor Forged Rod ed both ends ABC Piston/C vlinder true chrome Wntage Forster Glow & Ignition very low production engine produced America Sold factory direct Glow $9500Ignition $13500 choice 29 38 Add $300 S&il CA Residents add tax 4-6 weak delivery FACTORY PARTS & SERVICE FOR HB ENGINES- RJL ENGINES- HP ENGINES KRAFT 61 Cox CONQUEST 15 TAIPAN 40 HGK ENGINES- FORSTER ENGINES MCCOY SERIES 21 SLACK HEAD FINNED CASE CALL OR WRFIE FOR FREE INFORMATION RJL INDUSTRIES USA PO Box5 SIERRA Mwr CA 91025 TELEPHONE 818 359-0016 fr & MODEL BUILDING 7SERVICE RADIO CONT1OL PROOUCI3 carry full line Byron Originals Bob Parkerson Tom Cook Bob Violet products COD Orders Accepted 718 983-9735 128 WATCHOGUE tOAD EN SlAt-f 0314 wants produce turbulent boundary layer downstream attachment delay flow separation later surface nicely contoured NACA 0010 section actually slightly poorer performance slab sheet section Theres still lot learned going build new stab/elevator right now what kind would build No question about light Builder Model Rule has few rules event has remained unchanged least intent since start certainly does imply cannot should changed Over last few years opinions have stated privately press over validity relevance long-standing part event given reality busy modern life has become common local contests permit fliers enter planes comply BOM provided waive appearance points opinion good circumstance event general promotes fliers competing people get flying better off event will now future note endorsement unofficial stops local contests National Event Directors have knowingly permitted violations BOM nor should rule effect Further participants sign names enter stating will comply rules written Therefore rationalization anyone simply valid Realize points intentionally left unsaid perhaps time surface issue again deal course its companion appearance points BOM dropped appearance points go also no good way enforce can see argument facilitating greatest participation good buy has certainly helped RC legal few community would want supply finished competitive planes Thats positive Bottom line Precision Aerobatics community want away BOM get together work official rules process change rules Ive flying stunt thirty-nine years has always basic topic has stood test believe event has endured part because BOM has required competitors persevere achieve high standards Like old friend Ill hate see go year Northwest Regionals reputation largest finest CL meeting grows grows Held permanent CL site Eugene Oregon Airport features three asphalt four grass circles meet includes virtually competitive events year its May 25 26 Contact John Thompson 1145 Birch Ave Cottage Grove Oregon 97424 Tel 503/942-7324 details D CL Navy Carrier/Perry Continued page 56 required forward cockpit rear cockpit turtledeck formed -in balsa forward fuselage kept full depth A-in pieces added expand plywood doublers same height balsa outline cut resemble radial cowl prototype few additional pieces /8-in balsa around nose some sandpaper complete radial engine illusion horizontal stabilizer elevator cut hard %-in balsa n spruce piece hinge line hold dacron thread hinges spruce elevator section spans full width tail connects two halves elevator vertical stabilizer formed A-in balsa added strength Ive kept text short month allow photographs XS2C-l model would happy hear anyone wishes try XS2C-l conversion Sig Skyray will provide full-size outlines wingtips horizontal stabilizer elevator fuselage vertical stabilizer plus threeview drawing prototype XS2C-l bonus point documentation Cost package five dollars Theres still plenty time prepare Nationals Control Line flight areas have paved since last year flying conditions should considerably improved hope see D hi EIectri~g money back Adjustable silchlog polst Solderless lenolnal toe easy hookup ___ ON/OFF Controller ower save weIght very hIgh etficlency 006V loss 20 Sloe 22x13x63 Add SlOt shippio0 cslifoodrcidosodd 725%5217Ts Send Check money order coumoisi h Sky taIoosooo3929 Kansas St #9 obe~ooeSan DlegoCA 92104•- TELLITE FREE FLIGHT KITS ~Oo/o off ad 26 /A Gas 320 Gas 450 A-B Gas 788 B-C-fl Gas 788 8-C-fl Gas Full Kit $2795 Full Kit $3095 Fu K $4295 PoKI $4795 Fu Kt $6795 rnd 4~muhiIhuIsU CA OG P M vrlip U 0Ps Add $3 95 SP p 176 Model Aviation
Edition: Model Aviation - 1991/06
Page Numbers: 55, 173, 174, 176
WE ARE BLESSED some very talented individuals Precision Aerobatics community may aware Frank Williams Houston Texas Frank Sally Williams ably hosted CDd Houston contests including FAI team race team selections Besides being very talented flier always top twenty Continued page 173 - -o SEAIJ DHING LINE~1 0 --7Co 0 E JHfiIGE LAE o - - - Results Frank Williams wind tunnel tests Frank aeronautical engineer currently working NASAs Space Shuttle pro gram looked stab/elevator combinations saw some very inter esting phenomena See text detailed explanation Allen Brickhauss Arcturus ready go 1991 season An OS V Max 40 tuned pipe powers 64-oz 675 sq beauty Stuart Richmond sent photos Deifin 22 belonging Czechoslovakias top rated flier Viadisial Trnka Engine probably Tom Dixon Merco 61 Delfin breaks down transport June 1991 55 [Lttx Aerobatics Frank McMiIIan 12108 Gunter Grove San Antonio TX 78231 Windy Urtnowskis new Cardinal built PSP plans drawn Steve Buso Big Jim St-60 pipe engine lots goodies Windys Pro Stunt Products gorgeous ship STAB / ELEVATOR EFFICIENCY OPEN HINGE LINE VERSUS SEALED TAB- LEV6CHORL 3 THICKNES / TUNNEL VELOCITY 50MPH PEN C P 1t32 0 051015202530354045 ELEVATOR DEFLECTION DEGREES rest room food concession facilities field might make weekend part vacation lodging entertainment within ten minute drive field special interest readers column fact included 30 events flown Precision Sport Profile Scale full details super weekend contest please contact John Thompson 1145 Birch Avenue Cottage Grove Oregon 97424 Tel 503/942-7324 Rocky Mountain CL Championships held Saturday Sunday July 6 7 will also twoday meet Barbecue Saturday night Sport Profile Scale events will flown Sunday 7th full details meet write Gerald Deneau 6464 South Andes Place Aurora Colorado 80016 Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column CL Aerobatics/McMiIIan Continued page 55 several times top ten Frank Aeronautical Engineer working NASA Space Shuttle program About year ago Frank acquired portable wind tunnel has performed some experiments will interesting us SAMS MODELS SPITFIRE England13 or26 span Europes lead ng F ee F ght V ntage specialist SAMS 1600 Item catalog FREE Send $2 postage SAMS Chapel Sandon Herts SG9 OQJ England NOTE $ billsfVISA/ Master Card hecks & stamps valid England Heres account set evenings last winter Mike Denton spent little bit time looking stab/elevator combinations wind tunnel looked several different combinations shapes hinge line geometries saw some fairly interesting phenomena should reported some time time being though heres plot effect simple hinge line seal effectiveness relatively common stab/elevator shape begin tunnel has about 12 diameter test section capable producing velocity about 50 mph eight foot long tunnel powered hp motor straightening vanes screen mesh contraction section Its kind thing might find high school physics lab balance two component mechanical measuring lift drag measures nearest 01 pounds flow laminar might ultimately like its bad either its certainly lot better sitting shop guessing what might happening flow around section question expand moment lot experimental data wing sections control surfaces etc text books Unfortunately data isnt applicable modeler since derived Reynolds numbers velocities chord lengths far III SS00 Antque Mita y CviIiar Helicopters Sailpisnes I3Ous5553iewa~riasI IcrFOTO-PMKSkcIuingKOKUPANI I75P0 cATAL sunsI SHIPPING & HANDLING UPS Ground Contineetal US $495 UPS Air & Parcel Post $495 pIus 1 00k Subtotal IContinental US UPS Next Day Air $1400 plus $100 per lb Shipment total COD add $395 Foreign Orders Parcel Post Air $495 * 20% Subtotal US Mail $495 plus 10% Subtotal June 1991 173 WHY TAKE THE CHANCE OF DESTROYING YOUR MASTERPIECE WITH INFERIOR MASKING TAPE THINK ABO UT iT OUR KITS CONTAIN THE FINEST MASKING & FINE-LINE TAPE AVAILABLE ANYWHERE WE OFFER YOU PERFECTION DISCOVER THE ART OF MASKING MASKING MASTER $2525 MASKING MASThH9 II $1925 TECHTAPE MASKING TECHNOLOGY UREA TED FOR MODELERS BY MODELERS SATISFACTION GUARANTEED OR MONEY BACK SEE OUR OTHER AD IN THIS ISSUE PENETRATE THE SKY LanDer RCs DART GOOD FLYING SPORT AEROBATIC MODEL ITS ARF THATS MADE IN THE USA Fuselage Length 42Wing Span 63 Rec Engine Size 40-60 4 Stroke 80-90Area 630 sq Flying Weight 6 lbsRadio Channels 4 Send SASE free color catalog Phone 404-532-6401 900 530 EST M-F Lanier RC PO Box 458 Oakwood GA 30566 above what use However applicable data out look RPVs recoverable pilotless aircraft wind turbine research has begun appear some data close needs addition RC soaring community has sponsored some low Reynolds number experiments theoretical work recently Herk Stokely editor soaring column Flying Models publishes semi regular paper called Soar Tech covers some excellent technical topics dont know National Free Flight Society has published annual symposium report last 23 years covers low-speed aerodynamic subjects topics although may look little different certainly transferable Control Line applications However always cases like typical stunt ship stab elevator elevator deflection 45 degrees no us will ever very interested cases like having tunnel FAX 404-532-2163 garage going great advantage ever get time use tail section tests installed pair parallel plates section about three inches apart plates would allow approximate easily two dimensional flow field test sections made three inches wide just enough span test area stabs three inches length elevators also three inches long Thus overall chord length test article six inches span three inches test section Im going tell about made simply /8 sheet balsa leading edge stab slightly tapered rounded necessarily wedge shape slightly tapered about A6 diameter leading edge contour elevator triangular leading edge simple straight line taper trailing edge original open hinge line model Concours gaPthan lessa /32 almost visible unless held up light what really blew away youll see chart gap really better competent modelers usually build really didnt expect gain sealed tape bottom side tests simply measure lift drag section various settings elevator five degrees attitude stabilizer varied aligned parallel tunnel axis tests figure indicates fairly normal variation lift coefficient versus elevator deflection open hinge line model As measure confidence tunnel balanc3-the curve very close data other sources sealed hinge line model significant improvement can seen 200 deflection sealed section produces much lift unsealed section will ever generate 45 0 deflection Past 250 deflection sealed section falls off lift approaches magnitude unsealed 450 250 particular section sealed configuration produces about 25% lift unsealed section deflection Certainly something consider think felt beginning flier field 3/ control surface gap Tudor likely giving something away nice tight gap pro stunt a/c probably losing couple percent Better think again may performance As said earlier low Reynolds numbers some very interesting things happenphenomena quite unique model airplane aerodynamics particular sheet slab section moderate higher lift coefficients possessed laminar separation bubble leading edge stabilizer could seen inserting wire streamer thread test section area just downstream leading edge flow would separate bubble about inch reattach surface side effect bubble reattachment mother nature tries reshape flow pattern really Continued page 176 j Fults Tooling 174 Model Aviation HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT LTATONE PRODUCTS CORP Available dealer Made Amenca wait Amerleon Teehiwlogy RJL K61 Feetsea Include Single Ring Forged Piston investment Ceat Crankcase &hnueie Porting Double Ball Swings Forged Rod Bushed Both Ends Machined LaIesr sampurwr LOflcW~UU cuupmUnr HP VT2J & VT49 Four Cycle Made Austna hudwcries Features Include Double 81/Bearings ABC Overhead Rotary Valves supported roller bearings Forged Rod Bushed both ends Ringed ABC Piston/Cylinder true chrome HP Gold Cup 61 ABC Also Available 20 40 Sizes 61 Hell ringed 40& 61 rear intake Marine versions Features Include Schnuerle Porting Double Ball Bearings Slide Valve Carburetor Forged Rod ed both ends ABC Piston/C vlinder true chrome Wntage Forster Glow & Ignition very low production engine produced America Sold factory direct Glow $9500Ignition $13500 choice 29 38 Add $300 S&il CA Residents add tax 4-6 weak delivery FACTORY PARTS & SERVICE FOR HB ENGINES- RJL ENGINES- HP ENGINES KRAFT 61 Cox CONQUEST 15 TAIPAN 40 HGK ENGINES- FORSTER ENGINES MCCOY SERIES 21 SLACK HEAD FINNED CASE CALL OR WRFIE FOR FREE INFORMATION RJL INDUSTRIES USA PO Box5 SIERRA Mwr CA 91025 TELEPHONE 818 359-0016 fr & MODEL BUILDING 7SERVICE RADIO CONT1OL PROOUCI3 carry full line Byron Originals Bob Parkerson Tom Cook Bob Violet products COD Orders Accepted 718 983-9735 128 WATCHOGUE tOAD EN SlAt-f 0314 wants produce turbulent boundary layer downstream attachment delay flow separation later surface nicely contoured NACA 0010 section actually slightly poorer performance slab sheet section Theres still lot learned going build new stab/elevator right now what kind would build No question about light Builder Model Rule has few rules event has remained unchanged least intent since start certainly does imply cannot should changed Over last few years opinions have stated privately press over validity relevance long-standing part event given reality busy modern life has become common local contests permit fliers enter planes comply BOM provided waive appearance points opinion good circumstance event general promotes fliers competing people get flying better off event will now future note endorsement unofficial stops local contests National Event Directors have knowingly permitted violations BOM nor should rule effect Further participants sign names enter stating will comply rules written Therefore rationalization anyone simply valid Realize points intentionally left unsaid perhaps time surface issue again deal course its companion appearance points BOM dropped appearance points go also no good way enforce can see argument facilitating greatest participation good buy has certainly helped RC legal few community would want supply finished competitive planes Thats positive Bottom line Precision Aerobatics community want away BOM get together work official rules process change rules Ive flying stunt thirty-nine years has always basic topic has stood test believe event has endured part because BOM has required competitors persevere achieve high standards Like old friend Ill hate see go year Northwest Regionals reputation largest finest CL meeting grows grows Held permanent CL site Eugene Oregon Airport features three asphalt four grass circles meet includes virtually competitive events year its May 25 26 Contact John Thompson 1145 Birch Ave Cottage Grove Oregon 97424 Tel 503/942-7324 details D CL Navy Carrier/Perry Continued page 56 required forward cockpit rear cockpit turtledeck formed -in balsa forward fuselage kept full depth A-in pieces added expand plywood doublers same height balsa outline cut resemble radial cowl prototype few additional pieces /8-in balsa around nose some sandpaper complete radial engine illusion horizontal stabilizer elevator cut hard %-in balsa n spruce piece hinge line hold dacron thread hinges spruce elevator section spans full width tail connects two halves elevator vertical stabilizer formed A-in balsa added strength Ive kept text short month allow photographs XS2C-l model would happy hear anyone wishes try XS2C-l conversion Sig Skyray will provide full-size outlines wingtips horizontal stabilizer elevator fuselage vertical stabilizer plus threeview drawing prototype XS2C-l bonus point documentation Cost package five dollars Theres still plenty time prepare Nationals Control Line flight areas have paved since last year flying conditions should considerably improved hope see D hi EIectri~g money back Adjustable silchlog polst Solderless lenolnal toe easy hookup ___ ON/OFF Controller ower save weIght very hIgh etficlency 006V loss 20 Sloe 22x13x63 Add SlOt shippio0 cslifoodrcidosodd 725%5217Ts Send Check money order coumoisi h Sky taIoosooo3929 Kansas St #9 obe~ooeSan DlegoCA 92104•- TELLITE FREE FLIGHT KITS ~Oo/o off ad 26 /A Gas 320 Gas 450 A-B Gas 788 B-C-fl Gas 788 8-C-fl Gas Full Kit $2795 Full Kit $3095 Fu K $4295 PoKI $4795 Fu Kt $6795 rnd 4~muhiIhuIsU CA OG P M vrlip U 0Ps Add $3 95 SP p 176 Model Aviation
Edition: Model Aviation - 1991/06
Page Numbers: 55, 173, 174, 176
WE ARE BLESSED some very talented individuals Precision Aerobatics community may aware Frank Williams Houston Texas Frank Sally Williams ably hosted CDd Houston contests including FAI team race team selections Besides being very talented flier always top twenty Continued page 173 - -o SEAIJ DHING LINE~1 0 --7Co 0 E JHfiIGE LAE o - - - Results Frank Williams wind tunnel tests Frank aeronautical engineer currently working NASAs Space Shuttle pro gram looked stab/elevator combinations saw some very inter esting phenomena See text detailed explanation Allen Brickhauss Arcturus ready go 1991 season An OS V Max 40 tuned pipe powers 64-oz 675 sq beauty Stuart Richmond sent photos Deifin 22 belonging Czechoslovakias top rated flier Viadisial Trnka Engine probably Tom Dixon Merco 61 Delfin breaks down transport June 1991 55 [Lttx Aerobatics Frank McMiIIan 12108 Gunter Grove San Antonio TX 78231 Windy Urtnowskis new Cardinal built PSP plans drawn Steve Buso Big Jim St-60 pipe engine lots goodies Windys Pro Stunt Products gorgeous ship STAB / ELEVATOR EFFICIENCY OPEN HINGE LINE VERSUS SEALED TAB- LEV6CHORL 3 THICKNES / TUNNEL VELOCITY 50MPH PEN C P 1t32 0 051015202530354045 ELEVATOR DEFLECTION DEGREES rest room food concession facilities field might make weekend part vacation lodging entertainment within ten minute drive field special interest readers column fact included 30 events flown Precision Sport Profile Scale full details super weekend contest please contact John Thompson 1145 Birch Avenue Cottage Grove Oregon 97424 Tel 503/942-7324 Rocky Mountain CL Championships held Saturday Sunday July 6 7 will also twoday meet Barbecue Saturday night Sport Profile Scale events will flown Sunday 7th full details meet write Gerald Deneau 6464 South Andes Place Aurora Colorado 80016 Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column CL Aerobatics/McMiIIan Continued page 55 several times top ten Frank Aeronautical Engineer working NASA Space Shuttle program About year ago Frank acquired portable wind tunnel has performed some experiments will interesting us SAMS MODELS SPITFIRE England13 or26 span Europes lead ng F ee F ght V ntage specialist SAMS 1600 Item catalog FREE Send $2 postage SAMS Chapel Sandon Herts SG9 OQJ England NOTE $ billsfVISA/ Master Card hecks & stamps valid England Heres account set evenings last winter Mike Denton spent little bit time looking stab/elevator combinations wind tunnel looked several different combinations shapes hinge line geometries saw some fairly interesting phenomena should reported some time time being though heres plot effect simple hinge line seal effectiveness relatively common stab/elevator shape begin tunnel has about 12 diameter test section capable producing velocity about 50 mph eight foot long tunnel powered hp motor straightening vanes screen mesh contraction section Its kind thing might find high school physics lab balance two component mechanical measuring lift drag measures nearest 01 pounds flow laminar might ultimately like its bad either its certainly lot better sitting shop guessing what might happening flow around section question expand moment lot experimental data wing sections control surfaces etc text books Unfortunately data isnt applicable modeler since derived Reynolds numbers velocities chord lengths far III SS00 Antque Mita y CviIiar Helicopters Sailpisnes I3Ous5553iewa~riasI IcrFOTO-PMKSkcIuingKOKUPANI I75P0 cATAL sunsI SHIPPING & HANDLING UPS Ground Contineetal US $495 UPS Air & Parcel Post $495 pIus 1 00k Subtotal IContinental US UPS Next Day Air $1400 plus $100 per lb Shipment total COD add $395 Foreign Orders Parcel Post Air $495 * 20% Subtotal US Mail $495 plus 10% Subtotal June 1991 173 WHY TAKE THE CHANCE OF DESTROYING YOUR MASTERPIECE WITH INFERIOR MASKING TAPE THINK ABO UT iT OUR KITS CONTAIN THE FINEST MASKING & FINE-LINE TAPE AVAILABLE ANYWHERE WE OFFER YOU PERFECTION DISCOVER THE ART OF MASKING MASKING MASTER $2525 MASKING MASThH9 II $1925 TECHTAPE MASKING TECHNOLOGY UREA TED FOR MODELERS BY MODELERS SATISFACTION GUARANTEED OR MONEY BACK SEE OUR OTHER AD IN THIS ISSUE PENETRATE THE SKY LanDer RCs DART GOOD FLYING SPORT AEROBATIC MODEL ITS ARF THATS MADE IN THE USA Fuselage Length 42Wing Span 63 Rec Engine Size 40-60 4 Stroke 80-90Area 630 sq Flying Weight 6 lbsRadio Channels 4 Send SASE free color catalog Phone 404-532-6401 900 530 EST M-F Lanier RC PO Box 458 Oakwood GA 30566 above what use However applicable data out look RPVs recoverable pilotless aircraft wind turbine research has begun appear some data close needs addition RC soaring community has sponsored some low Reynolds number experiments theoretical work recently Herk Stokely editor soaring column Flying Models publishes semi regular paper called Soar Tech covers some excellent technical topics dont know National Free Flight Society has published annual symposium report last 23 years covers low-speed aerodynamic subjects topics although may look little different certainly transferable Control Line applications However always cases like typical stunt ship stab elevator elevator deflection 45 degrees no us will ever very interested cases like having tunnel FAX 404-532-2163 garage going great advantage ever get time use tail section tests installed pair parallel plates section about three inches apart plates would allow approximate easily two dimensional flow field test sections made three inches wide just enough span test area stabs three inches length elevators also three inches long Thus overall chord length test article six inches span three inches test section Im going tell about made simply /8 sheet balsa leading edge stab slightly tapered rounded necessarily wedge shape slightly tapered about A6 diameter leading edge contour elevator triangular leading edge simple straight line taper trailing edge original open hinge line model Concours gaPthan lessa /32 almost visible unless held up light what really blew away youll see chart gap really better competent modelers usually build really didnt expect gain sealed tape bottom side tests simply measure lift drag section various settings elevator five degrees attitude stabilizer varied aligned parallel tunnel axis tests figure indicates fairly normal variation lift coefficient versus elevator deflection open hinge line model As measure confidence tunnel balanc3-the curve very close data other sources sealed hinge line model significant improvement can seen 200 deflection sealed section produces much lift unsealed section will ever generate 45 0 deflection Past 250 deflection sealed section falls off lift approaches magnitude unsealed 450 250 particular section sealed configuration produces about 25% lift unsealed section deflection Certainly something consider think felt beginning flier field 3/ control surface gap Tudor likely giving something away nice tight gap pro stunt a/c probably losing couple percent Better think again may performance As said earlier low Reynolds numbers some very interesting things happenphenomena quite unique model airplane aerodynamics particular sheet slab section moderate higher lift coefficients possessed laminar separation bubble leading edge stabilizer could seen inserting wire streamer thread test section area just downstream leading edge flow would separate bubble about inch reattach surface side effect bubble reattachment mother nature tries reshape flow pattern really Continued page 176 j Fults Tooling 174 Model Aviation HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT LTATONE PRODUCTS CORP Available dealer Made Amenca wait Amerleon Teehiwlogy RJL K61 Feetsea Include Single Ring Forged Piston investment Ceat Crankcase &hnueie Porting Double Ball Swings Forged Rod Bushed Both Ends Machined LaIesr sampurwr LOflcW~UU cuupmUnr HP VT2J & VT49 Four Cycle Made Austna hudwcries Features Include Double 81/Bearings ABC Overhead Rotary Valves supported roller bearings Forged Rod Bushed both ends Ringed ABC Piston/Cylinder true chrome HP Gold Cup 61 ABC Also Available 20 40 Sizes 61 Hell ringed 40& 61 rear intake Marine versions Features Include Schnuerle Porting Double Ball Bearings Slide Valve Carburetor Forged Rod ed both ends ABC Piston/C vlinder true chrome Wntage Forster Glow & Ignition very low production engine produced America Sold factory direct Glow $9500Ignition $13500 choice 29 38 Add $300 S&il CA Residents add tax 4-6 weak delivery FACTORY PARTS & SERVICE FOR HB ENGINES- RJL ENGINES- HP ENGINES KRAFT 61 Cox CONQUEST 15 TAIPAN 40 HGK ENGINES- FORSTER ENGINES MCCOY SERIES 21 SLACK HEAD FINNED CASE CALL OR WRFIE FOR FREE INFORMATION RJL INDUSTRIES USA PO Box5 SIERRA Mwr CA 91025 TELEPHONE 818 359-0016 fr & MODEL BUILDING 7SERVICE RADIO CONT1OL PROOUCI3 carry full line Byron Originals Bob Parkerson Tom Cook Bob Violet products COD Orders Accepted 718 983-9735 128 WATCHOGUE tOAD EN SlAt-f 0314 wants produce turbulent boundary layer downstream attachment delay flow separation later surface nicely contoured NACA 0010 section actually slightly poorer performance slab sheet section Theres still lot learned going build new stab/elevator right now what kind would build No question about light Builder Model Rule has few rules event has remained unchanged least intent since start certainly does imply cannot should changed Over last few years opinions have stated privately press over validity relevance long-standing part event given reality busy modern life has become common local contests permit fliers enter planes comply BOM provided waive appearance points opinion good circumstance event general promotes fliers competing people get flying better off event will now future note endorsement unofficial stops local contests National Event Directors have knowingly permitted violations BOM nor should rule effect Further participants sign names enter stating will comply rules written Therefore rationalization anyone simply valid Realize points intentionally left unsaid perhaps time surface issue again deal course its companion appearance points BOM dropped appearance points go also no good way enforce can see argument facilitating greatest participation good buy has certainly helped RC legal few community would want supply finished competitive planes Thats positive Bottom line Precision Aerobatics community want away BOM get together work official rules process change rules Ive flying stunt thirty-nine years has always basic topic has stood test believe event has endured part because BOM has required competitors persevere achieve high standards Like old friend Ill hate see go year Northwest Regionals reputation largest finest CL meeting grows grows Held permanent CL site Eugene Oregon Airport features three asphalt four grass circles meet includes virtually competitive events year its May 25 26 Contact John Thompson 1145 Birch Ave Cottage Grove Oregon 97424 Tel 503/942-7324 details D CL Navy Carrier/Perry Continued page 56 required forward cockpit rear cockpit turtledeck formed -in balsa forward fuselage kept full depth A-in pieces added expand plywood doublers same height balsa outline cut resemble radial cowl prototype few additional pieces /8-in balsa around nose some sandpaper complete radial engine illusion horizontal stabilizer elevator cut hard %-in balsa n spruce piece hinge line hold dacron thread hinges spruce elevator section spans full width tail connects two halves elevator vertical stabilizer formed A-in balsa added strength Ive kept text short month allow photographs XS2C-l model would happy hear anyone wishes try XS2C-l conversion Sig Skyray will provide full-size outlines wingtips horizontal stabilizer elevator fuselage vertical stabilizer plus threeview drawing prototype XS2C-l bonus point documentation Cost package five dollars Theres still plenty time prepare Nationals Control Line flight areas have paved since last year flying conditions should considerably improved hope see D hi EIectri~g money back Adjustable silchlog polst Solderless lenolnal toe easy hookup ___ ON/OFF Controller ower save weIght very hIgh etficlency 006V loss 20 Sloe 22x13x63 Add SlOt shippio0 cslifoodrcidosodd 725%5217Ts Send Check money order coumoisi h Sky taIoosooo3929 Kansas St #9 obe~ooeSan DlegoCA 92104•- TELLITE FREE FLIGHT KITS ~Oo/o off ad 26 /A Gas 320 Gas 450 A-B Gas 788 B-C-fl Gas 788 8-C-fl Gas Full Kit $2795 Full Kit $3095 Fu K $4295 PoKI $4795 Fu Kt $6795 rnd 4~muhiIhuIsU CA OG P M vrlip U 0Ps Add $3 95 SP p 176 Model Aviation