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Discussion subtrim for pattern plane

M

mazjag

50cc
Guys, I`m putting together a 62 Osiris for sportsman pattern flying..I do understand sub-trim for the most part but here is my problem..I`m using the hi-tec servos with the blue servo horn ...I know you want to get these things 90 degrees with no sub-trim, but that is not gonna happen..Does it matter as much on a pattern plane as you are not gonna use all the throw in the servo anyways? I`m using 50% for my low rate so it seems it doesn`t matter if I don`t get full movment as I`m not using it...any input? thx..Jason
 
rcbirk21

rcbirk21

70cc twin V2
the biggest deal is making sure you get the same throw in both directions on all surfaces along with them all being centered at middle stick
 
wedoitall

wedoitall

Member
mazjag do you have the Osiris?

on my rudder i had a hard time with getting it perpendicular to the wing tube/elevator hinge line. the hitecs have a even amount on the splines (24 on the 65mg if i remember right) so i reversed the rudder arm and got it perfect.

i had to do that on my buck 50 not the Osiris
 
Last edited by a moderator:
M

mazjag

50cc
Yes, I have the Osiris.. My problem is all of the servo horns...all the plastic 4 prongs are too small and the blue aluminum ones don`t align without some sub-trim. Birk, I guess I need an angle meter and set the plane up symmetrical as far as throws?
 
wedoitall

wedoitall

Member
yea, harbor freight has one that Gyro recommended, thats the one ive been using. i have the aeroworks throw meter also but like the harbor freight better.
 
quadracer

quadracer

100cc
mazjag said:
Yes, I have the Osiris.. My problem is all of the servo horns...all the plastic 4 prongs are too small and the blue aluminum ones don`t align without some sub-trim. Birk, I guess I need an angle meter and set the plane up symmetrical as far as throws?
Click to expand...

Have you tried swapping the arms between different servos? Might work, might not.
 
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