Migrating trim

[Dan Mahalak]

hey guys.
every year i have to readjust my trim....always migrates to a nose up attitude...any hints as to why? I know sometimes is will not rotate when the handle is cranked, so teh ol' pinchy fingers never fails...but why teh migration?

any fixes other than getting in there again and readjusting?

[flyguy]

Re: Migrating trim

When mine migrates it's always because of slippage on a pully--I think it is more often the rear one, but then I may be predjudiced. (JK, I think they both slip at some time.
DC

[tawadc95]

Re: Migrating trim

Clean and lube the worm screw in the elevator leading edge possibly.
my cable would slip on the rear pulley do to the screw being gunked up.
I don't know if I can say this but I put a screw on inspection plate back ( underside of right elevator ) there to be able to service the screw and the bellcrank.
Check the rearmost fairlead as well, mine had been way off due to the screw hole getting augered out over time and was allowing the cable to become out of line with the rear trim pulley which in turn was wearing the pulley apart.
Just my experience.

[jmvolpp]

Re: Migrating trim

Slippage in 44305 seems to be the forward pulley, which is minimized by ensuring the elevator is in fairly neutral position and cranking slowly. Despite that, the stops eventually manage to get out of synch with the trim tab. It will also freeze on occasional real cold days here in Hoosierland - can't imagine that's not a frequent occurrence in the far north!

Mike V.

[Robert Lees]

Re: Migrating trim

Search is your friend:

http://vb.taylorcraft.org/showthread.php?t=1934

http://vb.taylorcraft.org/showthread.php?t=1174

http://vb.taylorcraft.org/showthread.php?t=528

http://vb.taylorcraft.org/showthread.php?t=49

[Buell Powell]

Re: Migrating trim

Dan,
Another thing you might check is to see if the key is in the slot for the rear pulley. The shaft it goes on has splines and when the pulley is pushed on it makes matching splines in the pulley. If the key is missing the splines may keep it from turning all the time but it can slip. Just something I ran across once.
Buell

[Forrest Barber]

Re: Migrating trim

take Rob's advice search . This should have been beat to death by now, when you turn the handle and the trim does not move, then it is "repositioned" hmmmm migrates sort of says it too! I always recommend clean cable and other things, rough up pulleys, lube, position correctly, THEN only turn it when the elevators are near neutral, feel if it doing something in flight, stop if it is not , yes it will always migrate to nose up...

[matsuthunder200]

Re: Migrating trim

Dan
Ive had that problem for years on mine it was the pullys, worn out.
I I know a guy that makes pullys out of alumanum he made me both front and rear He makes a speacial grove in the pully. It dose not slip had them for five years and they work perfect Even all winter when its 20 below.
He is a ai and is in willow if you want his number let me know. as far as a approval its a owner made part and can be approved.

[Forrest Barber]

Re: Migrating trim

RE pulleys, the notch is not round it is a wide "V" when we clean up pulleys we V them again. The brand new rear pulley is only $10.00 plus postage here in Alliance. e-mail me [email protected] or www.barberaircraft.com

[mulwyk]

Re: Migrating trim

I also got the little tail pulley from Forrest (a bargain) But I had to repair the forward pulley. It was chipped around the edge and it's groove was rounded and filled with crud.

I bought a set of cheepo needle files from Menard's. (Made in, of course, China) Most of the little files in the package were rectangular section, but one had a diamond shaped section. It fits the T-Craft trim pulley groove perfectly. Makes short work outa cleaning up the pulley groove. And that same file did a dandy job of cleaning up the threads on the actuation screw back in the tail.

[Forrest Barber]

Re: Migrating trim

In a pinch I have used carb cleaner or any solvent on a long piece of binder twine ( you farmers can explain that to the city kids) and rubbed it back and forth onto the whole pully groove to clean it out. Diamond shape file is good to!!