Radio Control: Aerobatics

RADIO CONTROL AEROBATICS U 4 ra SIll LT&IiWJ7T iiizwzi fl i7II SI LtThI kl WE PICK UP left off discussion basic flight maneuvers Having previously chewed way through Stall Turns Loops months discussion will consider Jmmelmanns Cuban Eights rolling maneuvers stan last column mentioned progressed up Pattern skill ladder basic maneuvers would constantly reappear elements compose more-complex maneuvers found higher-skill classes Pondering just few seconds leads straight conclusion good idea spend time effort necessary master simple fundamentals because simple fundamentals going go away cant decent Stall Turn Figure M s going struggle learn dont think Immelmana Turn really stan process fitting separate elements together complex maneuvers Something case can made Stall Turn well think Immelmann really first true hybrid maneuver Immelmann combines maneuver elements two oldest aerobatic maneuver families Loops Rolls its basic form center maneuver consists merely half loop half roll upright flight Looping rules apply downgrades After old friend straight-and-level entry half loop performed finishes precisely over point started center flag half roll done immediately after aircraft comes level inverted position should obvious center roll displaced offset slightly past maneuver center surprising pilots judges seem have bought idea roll centered pilot doing maneuver way results buttonhook effect radius half loop tightens up near top roll done slight up line Both mistakes will fetch stiff downgrade front judge knows rules As loops good strong engine pilots best friend during Immelmann most-common mistake losing heading andlor dipping during after rollusually result inadequate airspeed over top like roll out right against engine torque because believe holds nose up better maneuver finishes straight-and-level flight heading 1800 entry heading properly done entry heading parallel flight line means exit heading parallel well opposite direction common theme should have picked up now straight lines entry exit AMA Competition Regulations plain subject Maneuver entries exits . will least 15 meters length downgrade missing entrylexit line mandatory 2 points no downgrade exists making entry exit lines too long providing limits aerobatic frame observed Form straight-entry-and-exit habit scores will improve Cuban Eight like Immelmann hybrid maneuver made up rolling looping segments Unlike Immelmann symmetrical nutshell funny place symmetry means have over have have over well Actually according Websters means balanced correspondence opposing pans both sides median line about center axis size shape relative position should derive two partial loops make up body Eight supposed identical 450 down lines connect should intersect exactly front pilot half rolls should centered exactlyat midpoint down lines other arent very good deriving things can go read maneuver description section Competition Regulations Cuban first really complex maneuver encountered Pattern hierarchy usually takes pilots consistently perform well full October1998 95 Mike Lance L Seattle Lyle Laughery Tn-Cities WA area fly Masters Mikes well-done Boxer 120 foreground Rob Satalino L Jeff Aranyos matched Finesse models Excellent young Masters competitors Chicago IL area basic Cuban Eight maneuver included present Sportsman class Half Reverse Cuban included Novice class full half Cubans various types common feature current Advanced Masters FAI schedules Cubans tough maneuvers well tougher score well tougher judge well because maneuver composed elements basic Cuban obligatory straight-and-level entry must perform 5/ loop 450 inverted down line half roll line midpoint centered judges another 450 line segment another /v loop another 450 inverted down line another half roll centered midpoint second line first half roll judges final 450 down line finally 1/8 loop straight-and-level exit Cuban takes long time full easy places make serious mistake bad side big city Saturday night have model whizzing around up right front judges whole time has ten points give youor ten take away Cuban isnt gimmie under conditions can especially devilish wind As maneuver appears Sportsman class differs other looping maneuvers fact has downwind instead upwind orientation significant amount breeze can problem As always maneuver wind-corrected aircraft flown such way allow influence wind track aircraft geometry maneuver must remain unaffectedthe loops must round intersect point cross still centered etc have make look judge like isnt windy up can make look easy well 15 mph tailwind aircraft going take bit elevator input round loop will 15 mph headwind downwind 450 descent will have flown bit steeper Kestrel 2M has very popular fantasi since its introduction back 1993 customers have requested larger version wonderful flying sailplane Kestrel 100 its larger span higher aspect ratio has greater performance its little brother SD7084 airfoil used increase wings speed range penetration wingloading planform sinkrate L/D fantastic Another breakthrough sailplane NSP October 1998 96 Bob Crump lands Python after winning Sportsman round Bill Bowens Typhoon D carries its scoresheets fin Model Othello WA contest Dad Bob Crump well-known FAI pilot built Aeroshell Bill Tn-Cities WA area Wingspan 100935 sq weight 46 oz Wingloading 65 ozisq Airfoil 507084/7080 Skill level NOV/N Radio standard receiver 2-3 servos 550 mah battery pack P Northeast Products 16 Kirby Lane Willis h t t p 11w w w aiR c attitude allow drift upwind line flown shallow fuselage angle track must 450 horizon aircraft attitude should anything takes achieve objective Although throttle usually retarded during descents rolls given strong enough breeze might have fly upwind descents partial full throttle crosswind component might have everything described above also hold rudder wind Cuban can teach lot about aerobatic flying Respect practice often under different conditions can Common errors watch flattening bottoms loops overor under-pulling 450 descents habitually rolling late early making second loop larger first consistently performing whole maneuver off center Expect make errors Some form maneuver appears schedule class precisely because its such challenge time basic Cuban Eight appeared simultaneously Sportsman Advanced Expert Masters schedules Rolls come easily some people hard others doesnt seem correlate smoothness skill other maneuvers believe pilots have hard time rolls simply dont think upside down very well some reason aircraft goes its back minds select either off panic modes thumbs left struggle through thing alone cure keep mind cockpit realize aircraft doesnt care its upside down Watch wings fuselage angle relative horizon coordinate elevator input hold heading horizontal line amount varies design balancepoint location airplanes need small amount elevator input hold line through consecutive rolls Some people like provide quick shot down elevator aircraft comes inverted others use down up elevator airplane switches sides upright inverted back again kind rowing motion have seen good results using both methods whatever feels comfortable Whatever method rate must kept constant Three Horizontal Rolls roll rate should slow enough pilot judge can keep up what happening old AMA-style days three rolls commonly stretched five seconds total durationa length impossible turuaround flying Rolling right usually works better people rolling left works better Aileron differential up down should whatever particular aircraft takes achieve nice axial roll horizontally Most time designs will little different setting usually less what works perfectly vertical rolls check differential horizontal rolls some half reverse Cuban Eight-style turnarounds Note old common Pattern Split-S Pull 450 up line half roll continue line 5/ loop level flight tail airplane yaws same direction roll increase differential tail yaws opposite direction decrease differential Generally speaking farther rear balance point located given design better airplane will roll less elevator will needed maintain altitude careful fine spirits fast cars its easy dangerous go too far center point Three Horizontal Rolls maneuver inverted portion second roll Common faults three rolls performing maneuver off center gallops elevation improper altitude like center maneuver bottom half aerobatic frame Too high placement usually scores low Too October 1998 97 Escape Ordit WARRIRDS 97 RIRDS o u THUNDER IN THESAY NEW ENGLAND SCALE $1995 EACH PRIORITY MAIL TO1 AMR PRODUCTIONS P0 1011813 TOAIS RIVER II 08754 IGHTER VANES FULL sPIN Build Great Fighter Wind Vanes Yard Field 24 Inch Wing Span Color PiCS Plan Info Send $200 emaea LI1Rl IV 4338 Auslin Blvd Island ParK NY 11558 CANOPIESTeF 516/431-4121 Fax 516/889-2682 mrulOjee 5 olock e al otrer syotwos & have lull irS ul sorvo snoes wrUr Us vendor ird Call lax Jmul us 11 lop ace order loll ace ye free cata 09 low placement dangerous shows fault elevation bobble Other usual faults changes heading roll rate crashing latter very serious fault since get zero maneuver get go home early build new airplane Straight Inverted Flight really isnt much rolling maneuver As far Im concerned really isnt maneuver exercise bearing same relationship aerobatics piano scale does Mozart concerto does help think Straight Inverted Flight two-point roll center point midpoint inverted portion rules simple Roll line roll out line fly line middle looks better usually scores higher roll out slowly gracefully Fast slow make certain roll rate same both ends easiest spots Sportsman pattern steal points flip side maneuver easy correctly judge will usually zing total disgust mess up Weve looked lines entries exits flying straight-and-level stall turns loops rolls Cubans Immelmanns inverted flight just about covers building blocks Pattern flying exception snaps spins will have future subject advanced maneuvers merely combinations above Think giant pizza menu sky Yessir want half rolls square loop about couple vertical lines half roll half loop middle call Humpty Bump Special Aresti Catalog aerobatic maneuvers used IAC IMAC people actually set up way K factor degree difficulty values assigned elements make up maneuvers rather maneuvers themselves total K maneuver calculated just adding up various element K factors get decent grip basics weve covered youll able call yourself aerobatic pilot blushing winning Sportsman level above wont problem unless course opponent reads column too case may have resort drastic measures like increasing practice time important winning youll good shape move morecomplicated future wont intimidated impressive lists strange maneuvers because read down will see new exciting combinations old friends have already sharing practice time shippingS Save aver $30 now plus 10% orders next yearl Wood Skinned Wings 9250 Molded Parts $275 Deluxe Systems 9310 rscvt FAfltW srnw FREE CST Savers Club Membership system purchase U Composite Skinned Wings 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