Free Flight Old-Timers Clarence Haught TRIMMING UP time read spring should upon us have successful urgings get Old-Timer build new one its time trim up new bird Trimming initial flights always anx ious time have friend help eases tension nevertheless anxious time RC fliers have access experienced flier does have winters work stake may thus provide calmness coolness needed test flier Free Right us must own have previous Free Flight experience modem models will find transition Old-Timers easier some differences some old tried-and-true trim methods like stab tilt dont work well Old-Timers Some basic principles Center-of-gravity pylon models usually specified plans should about 50% wing chord CG cabin models about 33% wing chord measuring back leading edge Pylon models turn right under power cabin models turn left due propwash beyond simple dissertation important fact trim Glide circle may either direction usually simpler glide turn opposite power turn allows treat power glide portions separately although may argued opposite turn trim may cause model fly out thermal launched feel safer pattern Trim can broken down some basic rules 1 Control climb angle stabilizer inci dence 2 Control climb turn side thrust 3 Control glide circle rudder tab 4 Control glide angle center-of-gravity changes nose tail weight other variables complicate trim process system depends natural power turn engine side thrust overcome rudder offset glide turn during powered portion flight engine quits glide turn opposite direction controlled rudder tab offset Begin checking proper CG flying surface alignment Correct warps steaming out like passing warped surface over pan boiling water holding warped surface alignment cools little washout wing tips about 1/8 desir able other warps should eliminated trim method Hand-glide model correct diving zooming tendencies adjusting stabilizer will establish starting place will changing stabilizer angles correct climb angles Pack up leading edge correct zooming stall conditions Add rudder tab provide gentle turn left pylon models right cabin models Get engine running well full power prop intend use check timer engine stopping ready begin trim flights Start trimming full power reduced-power flights wont tell anything youll have start over increase power model should launched just off side wind slight upward angle Pylon models turn right under power should launched just right wind oppo site true cabin models start fivesecond engine run need see what hap pening running too long case something goes wrong Watch extent turn present climb angle can adjust turn adding side thrust engine minor rudder tab adjustments long disturb basic glide turn too much Adjust climb angle changing stabilizer incidence Go easy use small adjustments Adjust thing time otherwise may know what effects created adjustment Tiy another test hop observe flight pat tern everything seems okay increase engine run another three seconds try another flight things right make another adjustment Repeat sequence often necessary achieve good flight pattern Observe model engine quits see makes transition glide stall stalls climb too steepand resultant stall could disastrous least cost lot altitude Watch glide carefully determine size glide circle glide speed Look signs stalling diving glide correct adding removing tail nose weight Remember change thing per flight unless verge crashing Dont hurry process starts getting tedious pack up go home try agaln another day fresh last reminder Always use dethermalizer flight trim flight models have flown away some mighty short engine runs Trimming model same glide power turn popular modelers method can control both power glide circle direction rudder tab However im portant flight principle begins show up As model turns wing outside turn moving faster wing inside creating lift tending tighten up turn nose gets down during situation spiral dive will result often ends disastrously former trim technique factor usually neutralized opposite rudder tab solution spiral dive provide washin main panel wing inside circle creates lift offset lift cre ated faster-moving outboard wing panel lift increased drag too washed-in wing will drag glide assist establishing glide turn well may able establish right/right pattern pylon model left/left pattern cabin model using much rudder tab trick Continued page 162 62 Model Aviation Mike Mulligan launches Canadiandesign ed Veteran Californias Mile Square Park Design built conform 8-az rules Photo Mik Mikkeison Southern California ignition Fliers SCiFs sponsored contest two-bit models Engine man John Morreil built Scientific Models Miss Worlds Fair event spans 25 Mikkeison plc John Rieses craft isa Trenton Terror forthe 1/aA Texaco event Power isa Cox Baby Bee Site Moorpark CA Simi valley Photo Mikkeison BobSchafers Westerner has SuperCyclone power doped tissue covering Site Al bany OR Schafer photo SMHTh ZNDUETNZRD 7555 S GbeI 5od Atmcadeo CA 93422 5I 456-1717 am InvIted join NATIONAL SOARING SOCIETY OFFICIAL AMA SOARING SPECIAL INTERESTGROUP YEARLY NSS SOAR-IN TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PROGRAM EXCELLENT 81-MONTHLY NEWSLETTER NSS FULLY SUPPORTS ThE F3B SOARING TEAM & 1SF SOARING PROGRAM NSS IS INVOLVED IN ThE ORGANIZATION AND OVERSEEING O ThE SOARING PORTION OF AMA NATS INCLUDING AWARDS BANQUET YEARLY DUES ARE $1200 SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS Information Contact NSS Secretary/Treasurer R T DICK CR0 WLEY P0 Box 440342 Aurora CO 80044 towards supporting category Free Flight Club memberships $1250 per year says year-end renewal slip Should lower rates subscription newsletter am unable say can write Jim Adams SCAMPS Secretary 2538 W Spurgeon Santa Ana CA 92706 inquire accordingly Excuse now go dye some plastic See ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Old-Timers/Haught Continued page 62 much wasbin trailing edge down enough Most fliers start i Other trim factors same both methods trim situation think step through NEW FOURMOST PRODUCTS Bulk head Fitting Simple method feed fuel vent tubes through solId bulkheads DrIll hole No lB drIll sIze bulkhead fIrewall up 3/8 thick ProvIdes sealed tank compartment elImInates fuel line chaffIng Color coded easy identIfIcatIon MOULDED NYLON FUELPROOF WeIght 1/2GM EACH SIze 3/32 10 PRICE 2for $250 FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Bomb Release Fourmost Bomb-release mechanism SImple lIght weIght device Ideal fun-fly events Fasten unIt plane screws provIded Attach spring-loaded latch thread connect throttle rudder servo CorrosIon problem unit molded nylon sprIng stainless WeIght 1/10 OUNCE PRICE $250 503 357-2732 before attempting change Take easy keep flying Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Hemiptere/Backstrom Continued page 65 technique turn dryer twist warp Stratght place area hot air blast until tissue wrinkles flatten out remove hot air hold same position until cool may require applicationso have pa tience live central Texas have plenty grass fields fortestflymg calm winds testing Indoor models very rare As result usually make first test across bedroom onto bed Make up motor doubled 18-in-long Yn FAI rubber Proceed test glide adding clay necessary straight level glide model taken Indoor site glide tests continued using launch height about three feet appeared OK launch height increased normal standing post tion satisfied motor installed normally about 200 turns put few tries under power resulted removing clay added during glide tests adding downthrust now drawing other adjustment add bit clay right wing tip correct tendency turn too tightly left Fortunately model has rubber center very close model CG adding rubber causes very small trim change think best thing trimming model forget tandem wings just think model large tall CG about 60% MAC marked side view drawing CL Scale/Boss Continued page 66 NASA still alive making effort reestablish itself organization represent Scale modeling national level First respect NASA newsletter John Guenther said recognizes communica tion lack newsletter major problem within NASA solution may hand John hopes least part newsletter problem will solved through efforts Stan Alexander has just volun teered take job Replica editor Stan addition being current newsletter editor local Tennessee RC Club runs annual RC Scale Masters qualifying meet September Dixon TN appears Stan no stranger Scale modeling very well qualified handle job Replica editor wish him success tremendous undertaldng Stan has taken job Replica editor doesnt mean newsletter will miraculously appear regular intervals Stan going need material make publication guys gals heres come communication two-way street 1 62 Model Aviation AVAILABLE AT AMERICAS FINEST HOBBY SHOPS$495 DISTRIBUTED BY
Edition: Model Aviation - 1987/04
Page Numbers: 62, 162
Free Flight Old-Timers Clarence Haught TRIMMING UP time read spring should upon us have successful urgings get Old-Timer build new one its time trim up new bird Trimming initial flights always anx ious time have friend help eases tension nevertheless anxious time RC fliers have access experienced flier does have winters work stake may thus provide calmness coolness needed test flier Free Right us must own have previous Free Flight experience modem models will find transition Old-Timers easier some differences some old tried-and-true trim methods like stab tilt dont work well Old-Timers Some basic principles Center-of-gravity pylon models usually specified plans should about 50% wing chord CG cabin models about 33% wing chord measuring back leading edge Pylon models turn right under power cabin models turn left due propwash beyond simple dissertation important fact trim Glide circle may either direction usually simpler glide turn opposite power turn allows treat power glide portions separately although may argued opposite turn trim may cause model fly out thermal launched feel safer pattern Trim can broken down some basic rules 1 Control climb angle stabilizer inci dence 2 Control climb turn side thrust 3 Control glide circle rudder tab 4 Control glide angle center-of-gravity changes nose tail weight other variables complicate trim process system depends natural power turn engine side thrust overcome rudder offset glide turn during powered portion flight engine quits glide turn opposite direction controlled rudder tab offset Begin checking proper CG flying surface alignment Correct warps steaming out like passing warped surface over pan boiling water holding warped surface alignment cools little washout wing tips about 1/8 desir able other warps should eliminated trim method Hand-glide model correct diving zooming tendencies adjusting stabilizer will establish starting place will changing stabilizer angles correct climb angles Pack up leading edge correct zooming stall conditions Add rudder tab provide gentle turn left pylon models right cabin models Get engine running well full power prop intend use check timer engine stopping ready begin trim flights Start trimming full power reduced-power flights wont tell anything youll have start over increase power model should launched just off side wind slight upward angle Pylon models turn right under power should launched just right wind oppo site true cabin models start fivesecond engine run need see what hap pening running too long case something goes wrong Watch extent turn present climb angle can adjust turn adding side thrust engine minor rudder tab adjustments long disturb basic glide turn too much Adjust climb angle changing stabilizer incidence Go easy use small adjustments Adjust thing time otherwise may know what effects created adjustment Tiy another test hop observe flight pat tern everything seems okay increase engine run another three seconds try another flight things right make another adjustment Repeat sequence often necessary achieve good flight pattern Observe model engine quits see makes transition glide stall stalls climb too steepand resultant stall could disastrous least cost lot altitude Watch glide carefully determine size glide circle glide speed Look signs stalling diving glide correct adding removing tail nose weight Remember change thing per flight unless verge crashing Dont hurry process starts getting tedious pack up go home try agaln another day fresh last reminder Always use dethermalizer flight trim flight models have flown away some mighty short engine runs Trimming model same glide power turn popular modelers method can control both power glide circle direction rudder tab However im portant flight principle begins show up As model turns wing outside turn moving faster wing inside creating lift tending tighten up turn nose gets down during situation spiral dive will result often ends disastrously former trim technique factor usually neutralized opposite rudder tab solution spiral dive provide washin main panel wing inside circle creates lift offset lift cre ated faster-moving outboard wing panel lift increased drag too washed-in wing will drag glide assist establishing glide turn well may able establish right/right pattern pylon model left/left pattern cabin model using much rudder tab trick Continued page 162 62 Model Aviation Mike Mulligan launches Canadiandesign ed Veteran Californias Mile Square Park Design built conform 8-az rules Photo Mik Mikkeison Southern California ignition Fliers SCiFs sponsored contest two-bit models Engine man John Morreil built Scientific Models Miss Worlds Fair event spans 25 Mikkeison plc John Rieses craft isa Trenton Terror forthe 1/aA Texaco event Power isa Cox Baby Bee Site Moorpark CA Simi valley Photo Mikkeison BobSchafers Westerner has SuperCyclone power doped tissue covering Site Al bany OR Schafer photo SMHTh ZNDUETNZRD 7555 S GbeI 5od Atmcadeo CA 93422 5I 456-1717 am InvIted join NATIONAL SOARING SOCIETY OFFICIAL AMA SOARING SPECIAL INTERESTGROUP YEARLY NSS SOAR-IN TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PROGRAM EXCELLENT 81-MONTHLY NEWSLETTER NSS FULLY SUPPORTS ThE F3B SOARING TEAM & 1SF SOARING PROGRAM NSS IS INVOLVED IN ThE ORGANIZATION AND OVERSEEING O ThE SOARING PORTION OF AMA NATS INCLUDING AWARDS BANQUET YEARLY DUES ARE $1200 SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS Information Contact NSS Secretary/Treasurer R T DICK CR0 WLEY P0 Box 440342 Aurora CO 80044 towards supporting category Free Flight Club memberships $1250 per year says year-end renewal slip Should lower rates subscription newsletter am unable say can write Jim Adams SCAMPS Secretary 2538 W Spurgeon Santa Ana CA 92706 inquire accordingly Excuse now go dye some plastic See ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Old-Timers/Haught Continued page 62 much wasbin trailing edge down enough Most fliers start i Other trim factors same both methods trim situation think step through NEW FOURMOST PRODUCTS Bulk head Fitting Simple method feed fuel vent tubes through solId bulkheads DrIll hole No lB drIll sIze bulkhead fIrewall up 3/8 thick ProvIdes sealed tank compartment elImInates fuel line chaffIng Color coded easy identIfIcatIon MOULDED NYLON FUELPROOF WeIght 1/2GM EACH SIze 3/32 10 PRICE 2for $250 FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Bomb Release Fourmost Bomb-release mechanism SImple lIght weIght device Ideal fun-fly events Fasten unIt plane screws provIded Attach spring-loaded latch thread connect throttle rudder servo CorrosIon problem unit molded nylon sprIng stainless WeIght 1/10 OUNCE PRICE $250 503 357-2732 before attempting change Take easy keep flying Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Hemiptere/Backstrom Continued page 65 technique turn dryer twist warp Stratght place area hot air blast until tissue wrinkles flatten out remove hot air hold same position until cool may require applicationso have pa tience live central Texas have plenty grass fields fortestflymg calm winds testing Indoor models very rare As result usually make first test across bedroom onto bed Make up motor doubled 18-in-long Yn FAI rubber Proceed test glide adding clay necessary straight level glide model taken Indoor site glide tests continued using launch height about three feet appeared OK launch height increased normal standing post tion satisfied motor installed normally about 200 turns put few tries under power resulted removing clay added during glide tests adding downthrust now drawing other adjustment add bit clay right wing tip correct tendency turn too tightly left Fortunately model has rubber center very close model CG adding rubber causes very small trim change think best thing trimming model forget tandem wings just think model large tall CG about 60% MAC marked side view drawing CL Scale/Boss Continued page 66 NASA still alive making effort reestablish itself organization represent Scale modeling national level First respect NASA newsletter John Guenther said recognizes communica tion lack newsletter major problem within NASA solution may hand John hopes least part newsletter problem will solved through efforts Stan Alexander has just volun teered take job Replica editor Stan addition being current newsletter editor local Tennessee RC Club runs annual RC Scale Masters qualifying meet September Dixon TN appears Stan no stranger Scale modeling very well qualified handle job Replica editor wish him success tremendous undertaldng Stan has taken job Replica editor doesnt mean newsletter will miraculously appear regular intervals Stan going need material make publication guys gals heres come communication two-way street 1 62 Model Aviation AVAILABLE AT AMERICAS FINEST HOBBY SHOPS$495 DISTRIBUTED BY