Yhe Schuemann Wing latest advances come Germany new wing planform design has used impressive results both full-size model Sailplanes significantly reduces drag because simple shape can easily duplicated al wing U Peter Carr THERE ARE PILOTS like Brian Agnew Tom Brightbil can max out just picture model Sailplane Meanwhile rest us still looking special design will magi cally turn us Top Gun fliers Tradition ally search has led borrowing de sign features Free Flight fullLeft Our authors Atrix modified wing airfoil Eppler 205 root tip aileron set Inboard smooth tip airflow original wing has modified incorporate Schuemann planform Above trailing edge Discus wing tip Note slight less Aquila upaweep aileron stab hinge gaps sealed tape drafting Mylar 36 Model Aviation 110 WINGSPAN 22221886 FLAP275 RON I145 I44 145I I18I 6 REAR VIEW OF TIP DISCUS PLANFORM ATRIX PLANFORM SCHUEMANN WINGS Aithought theyre very similar look closely youll note two different planforms shown drawing left cen terline drawing depicts model-size version Discus planform right side depicts planform modified Atrix wing size aircraft nucleus frus tration delightF3B Soaring Today separate arenas full-size sailpianes F3B have come together give us clear design trend Both Discus Stan dard Class man-carrying sailplane Epsilon model F3B fame using Schuemann wing planform some very good reasons may want vestigate new configuration self Usage Schuemann wing hasnt confined sailplanes Burt Rutan has designed two new powered aircraft using planform six-passenger plane called Catbird features winglet just behind engine cowl Schuemann wing T-tail other plane Un limited Class Racer vaguely resem bles P-38 Lightning has two large en gine pods connected wing hori zontal stab cockpit pod middle Obviously virtues wing shape just apparent fast clean powered planes Discus large part drag produced wing comes inboard outboard ends reduce inboard drag wing meets fuselage designers use bolted-down mount attaches wing flush top fuselage mak ing two joints instead usual four result plug-in wings used outboard end wing tips trick reduce amount lift zero turn nullifies drag elliptical wing World War II British Spitfire good example tempt achieve Spitfire wing used smooth reduction chord zero point whereas Schuemann wing uses sharply defined breaks Spitfire wing tip produces slightly smaller drag numbers very hard average modeler reproduce Recently big fix tip drag turned-up turned-down tips such found Cessna 150 series full-size alrplane Aquila model Sailplane tip design variations sub ject much experimentation some very outlandish wings resulted Some de signers used outsized fins probably added drag saved great topics conversation fly ing field Much work missed main point problem Drag produced wing tip alone also much further inboard Wil Schuemann1 found through wool tuft tests ASW-12 Sail plane tip losses caused tips alone shape entire wing improve sailplane Mr Schuemann devised multiple sweep leading edgea real benefit us modelers shape causes airflow remain straight produces lift contrast traditional shapes allow flow change direction toward wing root about two-thirds chord produces flow separation wing surface uncontrollable change pressure near trailing edge two conditions continually produce drag contribute onset stall wing sailplane just part total package Characteristics associated nose tail moments ver tical horizontal tailplane areas will re main about same regardless wing shape exception would Blanik swept-forward planforms ThereFebruary 1989 37 6 8I Continued page 149 Tip view Discus ailerons board quite far help ensure clean straight flow tip model now year old latest design Schempp-Hirth Due single center-mount spoiler used Atrix built T-taii remove stab turbulence same type arrangement used full-size Discus TOLED THIRTY-FIFTH ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO ADVANCED TICKETS may ordered sending selfaddressed stamped business size 4Vax9 envelope TICKETS 38235 Castle Romulus Ml 48174 orders above 5 tickets must include extra postage US orders must include 25 centsper order handling charge foreign orders must include 50 cents per order handling charge need send addressed envelope will provide necessary postageExpress Mail Orders Will Accepted Include check money order US funds made payable Weak Signals R/C Club Ticket prices $400 per day adults $1 00 per dayfor children 12 under Please specify number Deadline ticket orders March 31 1989 sales final non-refundable TICKETSAREALSOAVAILABLEAT THE DOOR Exposition information available contacting Wayne Yeager co-director ticket address phone 313 941-6661 Bring latest completely finished models display enter competition exciting awards R/C radios will awarded first second third place winners following classes NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models No Engines HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED models entered competition will judged Best Finish Best MonoKote Directors Award Best Show Come join us enjoy yourselves unquestionably worlds greatest radio control model show will have traditional Swap Shop Saturday Night Auction Open public three great days APRIL 7 8 9 1989 FRIDAY9am to6pm SATURDAY9amto6pm SUNDAY9 am 430 pm presented Weak Signals R/C Club Toledo Ohio crystals explained last month Airtronics Fu taba arent making interchangeable crystals avail able products Now know rest story what think should done about channels Dont tell write AMA dis trict VP can tell George sent HAPPY NEW YEAR Schuemann WinglCarr Continued page 37 fore reducing wings drag essentially way reduce overall drag best accomplished using fully sheeted wing modified Atrix model shown photos rib/spar built-up structure wing could have made sheeted foam No matter what material inside goal make glass-smooth surface still strong enough withstand hard launches keeping goal airfoil should chosen will yield good compromise between thermaling speed requirements Several Eppler Selig airfoils clearly top choices No matter use reduction drag inherent Schuemann planform will increase wings performance Nearly high-speed powered aircraft use wings tapered root tip Sailplanes other hand generally use constant chord partway tip increase strength Schuemann wing used Discus modified Atrix con stunt chord about half span out tip leading edge swept back intervals about 40% 20% 10% modified Atrix wing diagram indi cates exact proportions used tip latest Discus design employs mild up turn trailing edge similar old Aquila model Sailplane tip chord small however doubt upsweep really has much effect center pres sure airfoil blurred since moves aft progressively toward tip retards noticeable step some airfoils like Eppler 205 exhibit effect rather forgiving ship less touchy elevator same 205 airfoil double-tapered wing very nice windy weather light lift may flying hard edge envelope As sweptwing aircraft center-of-gravity CU needs further aft would straight wing modified Atrix will unflyable center-of-gravity 25% root chord becomes very civ ilized CU back 33% 35% Utilizing planform also has addi tional advantage Sailplane straight wing ballasting becomes necessary windy conditions make model able penetrate Herk Stokelys Soaring col umn2 states really need crease airspeed about half wind speed get decent penetration prob lem ballast remains airplane during entire flight model using clean low-drag Schue mann wing will have higher average unbal lasted speed still working light lift landing slowly planform can fly unballasted others loading up add weight search far downwind gale winds still make back landing circle As full-size Discus will have no trouble picking out Sailplane gaggle will probably highest flying several times faster oth ers working lift no else can reach References 1 Spackman Elliot Schuemann Wing Planform RIG Soaring Digest July 1988 2 Herk Stokely Flying Models magazine September 1988 Note ATRIX plans Model Aviation magazine December 1986 issue RC Electrics/Kopski Continued page 39 issues t offered some motor/prop/power/rpm data cobalt 05s Continued page 153 February 1989 149
Edition: Model Aviation - 1989/02
Page Numbers: 36, 37, 149
Yhe Schuemann Wing latest advances come Germany new wing planform design has used impressive results both full-size model Sailplanes significantly reduces drag because simple shape can easily duplicated al wing U Peter Carr THERE ARE PILOTS like Brian Agnew Tom Brightbil can max out just picture model Sailplane Meanwhile rest us still looking special design will magi cally turn us Top Gun fliers Tradition ally search has led borrowing de sign features Free Flight fullLeft Our authors Atrix modified wing airfoil Eppler 205 root tip aileron set Inboard smooth tip airflow original wing has modified incorporate Schuemann planform Above trailing edge Discus wing tip Note slight less Aquila upaweep aileron stab hinge gaps sealed tape drafting Mylar 36 Model Aviation 110 WINGSPAN 22221886 FLAP275 RON I145 I44 145I I18I 6 REAR VIEW OF TIP DISCUS PLANFORM ATRIX PLANFORM SCHUEMANN WINGS Aithought theyre very similar look closely youll note two different planforms shown drawing left cen terline drawing depicts model-size version Discus planform right side depicts planform modified Atrix wing size aircraft nucleus frus tration delightF3B Soaring Today separate arenas full-size sailpianes F3B have come together give us clear design trend Both Discus Stan dard Class man-carrying sailplane Epsilon model F3B fame using Schuemann wing planform some very good reasons may want vestigate new configuration self Usage Schuemann wing hasnt confined sailplanes Burt Rutan has designed two new powered aircraft using planform six-passenger plane called Catbird features winglet just behind engine cowl Schuemann wing T-tail other plane Un limited Class Racer vaguely resem bles P-38 Lightning has two large en gine pods connected wing hori zontal stab cockpit pod middle Obviously virtues wing shape just apparent fast clean powered planes Discus large part drag produced wing comes inboard outboard ends reduce inboard drag wing meets fuselage designers use bolted-down mount attaches wing flush top fuselage mak ing two joints instead usual four result plug-in wings used outboard end wing tips trick reduce amount lift zero turn nullifies drag elliptical wing World War II British Spitfire good example tempt achieve Spitfire wing used smooth reduction chord zero point whereas Schuemann wing uses sharply defined breaks Spitfire wing tip produces slightly smaller drag numbers very hard average modeler reproduce Recently big fix tip drag turned-up turned-down tips such found Cessna 150 series full-size alrplane Aquila model Sailplane tip design variations sub ject much experimentation some very outlandish wings resulted Some de signers used outsized fins probably added drag saved great topics conversation fly ing field Much work missed main point problem Drag produced wing tip alone also much further inboard Wil Schuemann1 found through wool tuft tests ASW-12 Sail plane tip losses caused tips alone shape entire wing improve sailplane Mr Schuemann devised multiple sweep leading edgea real benefit us modelers shape causes airflow remain straight produces lift contrast traditional shapes allow flow change direction toward wing root about two-thirds chord produces flow separation wing surface uncontrollable change pressure near trailing edge two conditions continually produce drag contribute onset stall wing sailplane just part total package Characteristics associated nose tail moments ver tical horizontal tailplane areas will re main about same regardless wing shape exception would Blanik swept-forward planforms ThereFebruary 1989 37 6 8I Continued page 149 Tip view Discus ailerons board quite far help ensure clean straight flow tip model now year old latest design Schempp-Hirth Due single center-mount spoiler used Atrix built T-taii remove stab turbulence same type arrangement used full-size Discus TOLED THIRTY-FIFTH ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO ADVANCED TICKETS may ordered sending selfaddressed stamped business size 4Vax9 envelope TICKETS 38235 Castle Romulus Ml 48174 orders above 5 tickets must include extra postage US orders must include 25 centsper order handling charge foreign orders must include 50 cents per order handling charge need send addressed envelope will provide necessary postageExpress Mail Orders Will Accepted Include check money order US funds made payable Weak Signals R/C Club Ticket prices $400 per day adults $1 00 per dayfor children 12 under Please specify number Deadline ticket orders March 31 1989 sales final non-refundable TICKETSAREALSOAVAILABLEAT THE DOOR Exposition information available contacting Wayne Yeager co-director ticket address phone 313 941-6661 Bring latest completely finished models display enter competition exciting awards R/C radios will awarded first second third place winners following classes NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models No Engines HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED models entered competition will judged Best Finish Best MonoKote Directors Award Best Show Come join us enjoy yourselves unquestionably worlds greatest radio control model show will have traditional Swap Shop Saturday Night Auction Open public three great days APRIL 7 8 9 1989 FRIDAY9am to6pm SATURDAY9amto6pm SUNDAY9 am 430 pm presented Weak Signals R/C Club Toledo Ohio crystals explained last month Airtronics Fu taba arent making interchangeable crystals avail able products Now know rest story what think should done about channels Dont tell write AMA dis trict VP can tell George sent HAPPY NEW YEAR Schuemann WinglCarr Continued page 37 fore reducing wings drag essentially way reduce overall drag best accomplished using fully sheeted wing modified Atrix model shown photos rib/spar built-up structure wing could have made sheeted foam No matter what material inside goal make glass-smooth surface still strong enough withstand hard launches keeping goal airfoil should chosen will yield good compromise between thermaling speed requirements Several Eppler Selig airfoils clearly top choices No matter use reduction drag inherent Schuemann planform will increase wings performance Nearly high-speed powered aircraft use wings tapered root tip Sailplanes other hand generally use constant chord partway tip increase strength Schuemann wing used Discus modified Atrix con stunt chord about half span out tip leading edge swept back intervals about 40% 20% 10% modified Atrix wing diagram indi cates exact proportions used tip latest Discus design employs mild up turn trailing edge similar old Aquila model Sailplane tip chord small however doubt upsweep really has much effect center pres sure airfoil blurred since moves aft progressively toward tip retards noticeable step some airfoils like Eppler 205 exhibit effect rather forgiving ship less touchy elevator same 205 airfoil double-tapered wing very nice windy weather light lift may flying hard edge envelope As sweptwing aircraft center-of-gravity CU needs further aft would straight wing modified Atrix will unflyable center-of-gravity 25% root chord becomes very civ ilized CU back 33% 35% Utilizing planform also has addi tional advantage Sailplane straight wing ballasting becomes necessary windy conditions make model able penetrate Herk Stokelys Soaring col umn2 states really need crease airspeed about half wind speed get decent penetration prob lem ballast remains airplane during entire flight model using clean low-drag Schue mann wing will have higher average unbal lasted speed still working light lift landing slowly planform can fly unballasted others loading up add weight search far downwind gale winds still make back landing circle As full-size Discus will have no trouble picking out Sailplane gaggle will probably highest flying several times faster oth ers working lift no else can reach References 1 Spackman Elliot Schuemann Wing Planform RIG Soaring Digest July 1988 2 Herk Stokely Flying Models magazine September 1988 Note ATRIX plans Model Aviation magazine December 1986 issue RC Electrics/Kopski Continued page 39 issues t offered some motor/prop/power/rpm data cobalt 05s Continued page 153 February 1989 149
Edition: Model Aviation - 1989/02
Page Numbers: 36, 37, 149
Yhe Schuemann Wing latest advances come Germany new wing planform design has used impressive results both full-size model Sailplanes significantly reduces drag because simple shape can easily duplicated al wing U Peter Carr THERE ARE PILOTS like Brian Agnew Tom Brightbil can max out just picture model Sailplane Meanwhile rest us still looking special design will magi cally turn us Top Gun fliers Tradition ally search has led borrowing de sign features Free Flight fullLeft Our authors Atrix modified wing airfoil Eppler 205 root tip aileron set Inboard smooth tip airflow original wing has modified incorporate Schuemann planform Above trailing edge Discus wing tip Note slight less Aquila upaweep aileron stab hinge gaps sealed tape drafting Mylar 36 Model Aviation 110 WINGSPAN 22221886 FLAP275 RON I145 I44 145I I18I 6 REAR VIEW OF TIP DISCUS PLANFORM ATRIX PLANFORM SCHUEMANN WINGS Aithought theyre very similar look closely youll note two different planforms shown drawing left cen terline drawing depicts model-size version Discus planform right side depicts planform modified Atrix wing size aircraft nucleus frus tration delightF3B Soaring Today separate arenas full-size sailpianes F3B have come together give us clear design trend Both Discus Stan dard Class man-carrying sailplane Epsilon model F3B fame using Schuemann wing planform some very good reasons may want vestigate new configuration self Usage Schuemann wing hasnt confined sailplanes Burt Rutan has designed two new powered aircraft using planform six-passenger plane called Catbird features winglet just behind engine cowl Schuemann wing T-tail other plane Un limited Class Racer vaguely resem bles P-38 Lightning has two large en gine pods connected wing hori zontal stab cockpit pod middle Obviously virtues wing shape just apparent fast clean powered planes Discus large part drag produced wing comes inboard outboard ends reduce inboard drag wing meets fuselage designers use bolted-down mount attaches wing flush top fuselage mak ing two joints instead usual four result plug-in wings used outboard end wing tips trick reduce amount lift zero turn nullifies drag elliptical wing World War II British Spitfire good example tempt achieve Spitfire wing used smooth reduction chord zero point whereas Schuemann wing uses sharply defined breaks Spitfire wing tip produces slightly smaller drag numbers very hard average modeler reproduce Recently big fix tip drag turned-up turned-down tips such found Cessna 150 series full-size alrplane Aquila model Sailplane tip design variations sub ject much experimentation some very outlandish wings resulted Some de signers used outsized fins probably added drag saved great topics conversation fly ing field Much work missed main point problem Drag produced wing tip alone also much further inboard Wil Schuemann1 found through wool tuft tests ASW-12 Sail plane tip losses caused tips alone shape entire wing improve sailplane Mr Schuemann devised multiple sweep leading edgea real benefit us modelers shape causes airflow remain straight produces lift contrast traditional shapes allow flow change direction toward wing root about two-thirds chord produces flow separation wing surface uncontrollable change pressure near trailing edge two conditions continually produce drag contribute onset stall wing sailplane just part total package Characteristics associated nose tail moments ver tical horizontal tailplane areas will re main about same regardless wing shape exception would Blanik swept-forward planforms ThereFebruary 1989 37 6 8I Continued page 149 Tip view Discus ailerons board quite far help ensure clean straight flow tip model now year old latest design Schempp-Hirth Due single center-mount spoiler used Atrix built T-taii remove stab turbulence same type arrangement used full-size Discus TOLED THIRTY-FIFTH ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO ADVANCED TICKETS may ordered sending selfaddressed stamped business size 4Vax9 envelope TICKETS 38235 Castle Romulus Ml 48174 orders above 5 tickets must include extra postage US orders must include 25 centsper order handling charge foreign orders must include 50 cents per order handling charge need send addressed envelope will provide necessary postageExpress Mail Orders Will Accepted Include check money order US funds made payable Weak Signals R/C Club Ticket prices $400 per day adults $1 00 per dayfor children 12 under Please specify number Deadline ticket orders March 31 1989 sales final non-refundable TICKETSAREALSOAVAILABLEAT THE DOOR Exposition information available contacting Wayne Yeager co-director ticket address phone 313 941-6661 Bring latest completely finished models display enter competition exciting awards R/C radios will awarded first second third place winners following classes NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models No Engines HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED models entered competition will judged Best Finish Best MonoKote Directors Award Best Show Come join us enjoy yourselves unquestionably worlds greatest radio control model show will have traditional Swap Shop Saturday Night Auction Open public three great days APRIL 7 8 9 1989 FRIDAY9am to6pm SATURDAY9amto6pm SUNDAY9 am 430 pm presented Weak Signals R/C Club Toledo Ohio crystals explained last month Airtronics Fu taba arent making interchangeable crystals avail able products Now know rest story what think should done about channels Dont tell write AMA dis trict VP can tell George sent HAPPY NEW YEAR Schuemann WinglCarr Continued page 37 fore reducing wings drag essentially way reduce overall drag best accomplished using fully sheeted wing modified Atrix model shown photos rib/spar built-up structure wing could have made sheeted foam No matter what material inside goal make glass-smooth surface still strong enough withstand hard launches keeping goal airfoil should chosen will yield good compromise between thermaling speed requirements Several Eppler Selig airfoils clearly top choices No matter use reduction drag inherent Schuemann planform will increase wings performance Nearly high-speed powered aircraft use wings tapered root tip Sailplanes other hand generally use constant chord partway tip increase strength Schuemann wing used Discus modified Atrix con stunt chord about half span out tip leading edge swept back intervals about 40% 20% 10% modified Atrix wing diagram indi cates exact proportions used tip latest Discus design employs mild up turn trailing edge similar old Aquila model Sailplane tip chord small however doubt upsweep really has much effect center pres sure airfoil blurred since moves aft progressively toward tip retards noticeable step some airfoils like Eppler 205 exhibit effect rather forgiving ship less touchy elevator same 205 airfoil double-tapered wing very nice windy weather light lift may flying hard edge envelope As sweptwing aircraft center-of-gravity CU needs further aft would straight wing modified Atrix will unflyable center-of-gravity 25% root chord becomes very civ ilized CU back 33% 35% Utilizing planform also has addi tional advantage Sailplane straight wing ballasting becomes necessary windy conditions make model able penetrate Herk Stokelys Soaring col umn2 states really need crease airspeed about half wind speed get decent penetration prob lem ballast remains airplane during entire flight model using clean low-drag Schue mann wing will have higher average unbal lasted speed still working light lift landing slowly planform can fly unballasted others loading up add weight search far downwind gale winds still make back landing circle As full-size Discus will have no trouble picking out Sailplane gaggle will probably highest flying several times faster oth ers working lift no else can reach References 1 Spackman Elliot Schuemann Wing Planform RIG Soaring Digest July 1988 2 Herk Stokely Flying Models magazine September 1988 Note ATRIX plans Model Aviation magazine December 1986 issue RC Electrics/Kopski Continued page 39 issues t offered some motor/prop/power/rpm data cobalt 05s Continued page 153 February 1989 149