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Author Topic: Trimovanje modela - korak po korak  (Read 1063 times)

Offline mtesa

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Trimovanje modela - korak po korak
« on: May 05, 2010, 10:12:18 AM »
Nasao sam sledeci tekst koji opisuje trimovanje modela korak po korak.
Mislim da je za pocetnike, kao ja, jako bitna stvar.
Molio bih poznavaoce teme da komentarisu ovaj tekst, dopune, izmjene i naprave boljim.
Mozda i da ga prevedemo, stavku po stavku?

Notes: Trimming must be done with little or no wind. Make multiple tests before making adjustments. Start at the beginning and work down the list for best results. If any changes are made, go back over the previous steps and verify or adjust further if necessary as each adjustment can cause earlier settings to change. CHANGE ONLY ONE THING AT A TIME!!

1. Control Centering: Fly straight and level. Use transmitter trims for hands off straight and level flight. Adjust clevis to center transmitter trims, or reset computer trims.

2. Control throws: Fly model and apply full deflection of each control in turn. Check response of each control; Aileron hi-rate: 3 rolls in 4 seconds, low rate: 3 rolls in 6 seconds, Elevator high rate: to give a good and smooth corner, low rate: to give a loop of approx. 130 foot in diameter, Rudder high rate: 30-35 degrees for stall turns, low rate: to maintain knife edge.

3. Decalage: Power off vertical dive, cross wind (if any). Release controls when model is vertical (elevator trim must be neutral).
    A: Model continues straight down; no adjustment
    B: Model starts to pull nose up; Reduce wing incidence
    C: Model starts to pull nose down; Increase wing incidence

4.Center of gravity:
Method 1:  Roll into a near vertically banked turn
     A: Nose drops; Add tail weight
    B: Tail drops; Add nose weight
Method 2: (Simple)  Roll inverted
     A: Lots of down elevator required to maintain level flight; Add tail weight.
    B: No down elevator required or plane climbs; Add nose weight.

5. Tip weight: (course adjustment) Fly straight and level upright. Adjust aileron trim for level flight. Roll inverted, level wings and release stick.
    A: Model does not drop a wing; No adjustment.
    B: Left wing drops; Add weight to right tip.
    C: Right wing drops; Add weight to left tip.

6. Side thrust: Fly away from you, into any wind and pull vertical.
    A: Model continues straight up; No adjustment.
    B: Model veers left; Add right thrust.
    C: Model veers right; Reduce right thrust.

7.Up/Down thrust: Fly normal path into wind, parallel to you, approx 100 yards from you. Elevator trim should be neutral per test 3. Pull vertical and release elevator.
    A: Model continues straight up; No adjustment
    B: Model pitches nose up; Add down thrust
    C: Model pitches nose down; Reduce down thrust

8. Tip weight:(fine adjustment)
    Method 1: Fly model as per test 7, and pull into a small loop (1 only).
    Method 2: Fly model as per test 7, and push into a small outside loop (1 only).
    A: Model comes out with wings level; No adjustment
    B: Model comes out with right wing low; Add weight to left tip.
    C: Model comes out with left wing low; Add weight to right tip.






9.Aileron differential:
    Method 1:  Fly towards you and pull into a vertical climb. Release controls, then do a half roll.
    A: No heading changes; No adjustment.
    B: Heading changes to opposite of roll command (veers left after right roll); Increase differential
    C: Heading changes in direction of roll command.; Reduce differential.
Method 2:Fly model on a normal pass and do three or more rolls.
    A: Roll axis on model center line; No adjustment.
    B: Roll axis off same as roll same as roll command (right roll, roll axis off right wing tip); Increase differential.
    C: Roll axis opposite of command; Reduce differential.

10. Dihedral: Fly on normal pass and roll knife edge. (left and right)
    A: Model holds knife edge; No adjustment needed.
    B: Model rolls in direction of rudder; Reduce dihedral.
    C: Model rolls opposite direction of rudder; Add dihedral.

11. Elevator alignment with independent halves: Fly model per test 6 and pull into a loop. Roll inverted and push into an outside loop.
    A: No roll tendency when elevator applied; No adjustment needed.
    B: Model rolls same in both tests; Elevator halves misaligned. Raise one half or lower the other according to roll.
    C: Model rolls opposite in both tests; One elevator half has more throw than the other. Model rolls          direction of more throw.

12.Pitching in knife edge: Fly per test 10.
    A: No pitch up or down; No adjustment needed.
    B: Nose pitches up; *
    C: Nose pitches down; Reverse below.
    *Alternate cures:
        1) Move C.G.aft
        2) Increase wing incidence;
        3) Add down trim to ailerons.

Striker, listen, and you listen close: flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes.

Offline zajo

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Re: Trimovanje modela - korak po korak
« Reply #1 on: May 07, 2010, 06:52:18 PM »
Ovo su VEOMA vazne informacie.Kao prvo da kazem da se ovo odnose za akrobatske avione skoro isklucivo,znaci za F3A, IMAC i za ljudi koe koriste avion za 3D i IMAC.Za isklucivo 3D avione kao ADDICTION nemora sve da vazi.Ovaj post bi vise odgovarao kod akrobatske.Ljudi koi se natprevaruvaju u F3A I IMAC potrose puno vremena kako bi natrimali model.Naravno da neke stvari zavisi od pilotske volje te.kako njemu odgovara.Evo imam vremena pa da pocnem da prevodim iz Engleski na Makedonski pa na Srpski ") e ovo ce da bude karamkasa :sljus.

Uvod:Trimanje mora da se uradi bez ili sa veoma malo vetar.Uradite isti test vise puta prie nego uradite izmene.Pocnite iz pocetka pa idite dalje korak po korak.Ako nesto izmenite vratite se nazad na prvi test jer izmena imce vlianie na sve tacke.MENJAJTE SAMO PO JEDNA STVAR .

1.Centrirenje kontrole:Letite pravo i vodoravno i otpustite stikove (ovo mora da se uradi na puna gas) i trimaj.E sad kaze da ne ostavimo stanicu sa trimove levo ili desno nego ili da upamtimo gde su otklone bile pa da manuelno pomestimo da budu tamo dok na stanici su trimove na centar ili da to uradimo uspomoc sub trim-kompjuterski a da u svakome slucaju trimove na stanice da ostanu u sredini.Ovo kaze zato sto je stanica glupa,pa kad kasnie radimo miksove i dr.ona ne upamti trim.Ja ovo nisam primenio i nisam imao problema mada nisam imao potrebe od mix do sad).

2.Dual rate's-velicina otklona:Dok letite model dajte eleron,elevator,rudder do kraj jedno po jedno i obzervirajte ponasanje.Eleroni max otklon 3 valjaka za 4 sekunde?Ovo mora da zavisi od velicina modela ne?I ostalo nema veze,moslim zavisi od model zad ne?Obicno pise u manuel a ako nepise ja bi rekao za 3d do daske zna se,a za namaleni  otklon najbolje se oseti dok letimo.Ja bi rekao da je dobro da se namesta veoma mali otkloni pa onak pojacamo ono sto nama je slabo.A moze i obrnuto.
(molim da me neko popravi ako misli drugacie)

3.Agol krila.Ovo se odnosi na samogradnju a za arf ja ne bi pipnuo.Gas minimum,postavite model u vertikalan pad 90% nadole i otpustite stikove(horizontalac mora da bude u centar):ako nista neradi nista nepiaj.Ako vlece na "gore"-ako izlazi iz "gnjurenje"ondak je agol pre visok,ako izlazi na grb obrnuto.
E sad zasto CG na cetvrto mesto?Ja bi stavio na treto jer ako je model veoma nosat ondak leti ce vodoramno sa vertikalac malo nagore ali zato kazu(elevator mora da bude u sredini-centar).Idemo dalje.

4.Teziste.Razumem prvi metod ali mislim da je previse delikantan,zato drugi metod:Letajte naopacki:model netrazi horizontalac(repast),trazi previse horizontalac nadole(nosat).Odlicno.

5.Poprecno teziste.Letite pravo i vodoramno i nacentrirajte elerone.Prevrtite model naopacke i otpustite stikove:
A:Model leti pravo(ne pipaj)
B:Model radi roll u levo(dodajte tezinu na desno krilo) i obrnuto.

Toliko od mene za sada.

« Last Edit: May 07, 2010, 06:58:17 PM by zajo »
Every model airplane starts in a box and end in a bag :) Ido Segev

Offline coka

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Re: Trimovanje modela - korak po korak
« Reply #2 on: May 08, 2010, 09:49:34 PM »
 Pozdrav

Interesantno i vrlo detaljno i shvatljivo.
 Ali dzabe...
Pisao sam nekoliko puta vec o trimovanju i ni sam ne znam koliko puta svima objasnjavao, pa na kraju digao ruke, jer:

1. Retko koji model dozivi 20-ak letova pa da stignete da ga utrimujete
2. Svi misle da sve mogu sami
3. Cim dodje do toga da treba izvesti vecu prepravku, tipa malo olova u kraj krila ili promena ugla motora, svi tu stanu
4. Retko ko i vidi razliku izmedju polunatrimovanog i natrimovanog aviona

 Ipak, samo napred od necega se mora poceti. Nije trimovanje samo pomeranje trimera na stanici.

Offline zajo

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Re: Trimovanje modela - korak po korak
« Reply #3 on: May 09, 2010, 03:59:42 PM »
Pozdrav Coka.Sve je to tacno sto si rekao.Ova stver je prilicno delikatna jer par ljudi bi imali model i znanje da ovo iskoriste.Ipak nije lose da stoi ovaj topic pa makar njega iskoristi i jadan u dve godine.Spored moje misljenje kvalitetan ARF ne bi trebao da trazi puno trimovanja.
Kako sam prevodio ovaj post tako sam i ucio kako treba.Ja cu testirati moi YAK54 ali kasnie i polako jer vec znam da je malo repast, mada tamo je QQ preporucio teziste.Izgleda da on leti na granici na repast model kako bi mogao da radi dobar free style.Sto sam hteo reci je da cu kasnie da pokusam natrimovati model pa ako  nesto primetim pisem ovde ili tebi na PM za savet kako to resiti.
Sto se tice prevod,ja cu da produzim ali ako sam nesto pogresio ili se neko neslaze MOLIM da me ispravi.
Poz.
Every model airplane starts in a box and end in a bag :) Ido Segev