Free Flight Indoor Bud Tenny BIG SUMMER last two columns have commented early thorough planning already done 1986 Nats especially regard scheduling Indoor events other big Indoor meet summer US door Championships sponsored National Free Flight Society Tony Italiano NFFS Indoor ramrod has nounced USIC will held same site last yearthe convention center Niagara Falls NY excellent site last years meet wellmanaged contest announced date next USIC June 17-19 1986 should good warmup Nats other hand planning 1986 Lake Charles Nats has done should insure excellent contest two very good sites will used either Civic Center downtown Lake Charles Burton Coliseum Both have similar floor area approximately same hangup hazards Col iseum has higher ceiling Start building now contests care feeding props Last time started talking about prop wobble usually can prevent prop wobble careful construction attention detail Once prop built things check may cure problem However quote Dick Kowal ski Sometimes prop just wobbles its way glory Fix replace general hard look prop tell will wobble learn flying visual inspection offending prop may show problem checklist 1 The prop shaft must perfectly alignedperpendicular spar centerline shaft must pass through center motor see Figure 1 2 The hook should formed motor tends center itself Some times double knot forms hook motor fully wound knot off-center prop may wobble stralghten out before launch 3 The blade angle pitch should equal both blades addition camber should match both blades Covered props using sliced ribs builtup frame galn lose camber ribs damaged All-balsa prop blades can lose camber twist high humidity collisions obstructions can crack wood glue joints 4 Both prop blades should have exactly same blade shape area same mechanical strength blade must build right first After prop has used need check often sure hasnt damaged cracked outline loosened rib can lead uneven stress loading unequal pitch between blades Uneven covering ten sion between blades can give different airfoil blade usually resulting uneven running Small holes cover ing reduce blade efficiency larger holes will probably make prop wiggle Fixes bent prop shaft misalign ment hook usually clearly visible severe enough cause prop wobble double thrust-bearing Very few Continued page 152 r i eI /Ij--\ fi4\\ hi) 4 Model Aviation good prop-pitch-checker allows measuring pitch angle anywhere blade Props deep camberand twist require speciai care repaired Stan Chiitons Easy B Note thin prop biades fuliiength spar L Kruse plc typicai indoor-prop shaft L must pass through center spar perpendicu iar wood both pianes version seifcenterlng hook R Theres information make coiumn S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side as
Edition: Model Aviation - 1986/04
Page Numbers: 74, 152
Free Flight Indoor Bud Tenny BIG SUMMER last two columns have commented early thorough planning already done 1986 Nats especially regard scheduling Indoor events other big Indoor meet summer US door Championships sponsored National Free Flight Society Tony Italiano NFFS Indoor ramrod has nounced USIC will held same site last yearthe convention center Niagara Falls NY excellent site last years meet wellmanaged contest announced date next USIC June 17-19 1986 should good warmup Nats other hand planning 1986 Lake Charles Nats has done should insure excellent contest two very good sites will used either Civic Center downtown Lake Charles Burton Coliseum Both have similar floor area approximately same hangup hazards Col iseum has higher ceiling Start building now contests care feeding props Last time started talking about prop wobble usually can prevent prop wobble careful construction attention detail Once prop built things check may cure problem However quote Dick Kowal ski Sometimes prop just wobbles its way glory Fix replace general hard look prop tell will wobble learn flying visual inspection offending prop may show problem checklist 1 The prop shaft must perfectly alignedperpendicular spar centerline shaft must pass through center motor see Figure 1 2 The hook should formed motor tends center itself Some times double knot forms hook motor fully wound knot off-center prop may wobble stralghten out before launch 3 The blade angle pitch should equal both blades addition camber should match both blades Covered props using sliced ribs builtup frame galn lose camber ribs damaged All-balsa prop blades can lose camber twist high humidity collisions obstructions can crack wood glue joints 4 Both prop blades should have exactly same blade shape area same mechanical strength blade must build right first After prop has used need check often sure hasnt damaged cracked outline loosened rib can lead uneven stress loading unequal pitch between blades Uneven covering ten sion between blades can give different airfoil blade usually resulting uneven running Small holes cover ing reduce blade efficiency larger holes will probably make prop wiggle Fixes bent prop shaft misalign ment hook usually clearly visible severe enough cause prop wobble double thrust-bearing Very few Continued page 152 r i eI /Ij--\ fi4\\ hi) 4 Model Aviation good prop-pitch-checker allows measuring pitch angle anywhere blade Props deep camberand twist require speciai care repaired Stan Chiitons Easy B Note thin prop biades fuliiength spar L Kruse plc typicai indoor-prop shaft L must pass through center spar perpendicu iar wood both pianes version seifcenterlng hook R Theres information make coiumn S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side as