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T-REX 450 › GP 750 Gyro limit setting issue/question
01-18-2010 06:26 PM  8 years agoPost 21
meowsqueak

rrApprentice

New Zealand

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I think bowies12 is right, the answer is to use a larger radius on the servo horn, and then set up the gyro limits via the gyro itself.

str8den - the rudder ATV has no effect on the rudder extents as bowies12 explains, but I do appreciate your reply. Thank you

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01-18-2010 06:27 PM  8 years agoPost 22
str8den

rrVeteran

NE U.K

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yes you are correct, i knew that (honestly!) but now feel stupid for saying what i did

PS.
moving the ball further out on the horn will do it, but the GP750 has to see/recognize 50% servo movement in order to set the travel-limit.
when set-up in rate mode, the tps will be more to one side than the other to maintain a 'heading,' if the ball on the servo-horn is too far from centre the servo will not reach 50% of its travel at maximum and the gp750 won't be able to set its 'limit.'

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01-18-2010 07:58 PM  8 years agoPost 23
meowsqueak

rrApprentice

New Zealand

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Ok, that's good to know.

A related question - does anyone know why, in Rate Mode, the tail servo reaches its limit at only +/- about half stick?

I.e. the tail blades move to maximum pitch by the time the rudder stick reaches about 25/75%. Then there's a complete dead zone beyond that on both sides.

0-25%: nothing
25-50%; various degrees of left rudder
50% (midstick): rudder in 'hold' position
50-75%: various degrees of right rudder
75-100%: nothing

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01-18-2010 10:27 PM  8 years agoPost 24
ACKopter

rrApprentice

Florida

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I may have over looked it but I didn't see any mention of whether your rudder channel is normal or reversed. It may seem crazy but if the rudder channel in your radio is reversed then you need to reverse the procedure for settings your travel limit as outlined in the manual.
As I recall the manual says slowly move the rudder stick LEFT to full throw, pause briefly then move the rudder stick RIGHT to full throw, etc.
If your rudder channel is reversed then you need to simply reverse this procedure, ie, move stick RIGHT full throw, pause, move stick LEFT full throw, etc.
I just finished installing a GP750 on a 500 and my rudder is reversed, I followed this procedure and had no trouble with set-up.

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01-18-2010 11:45 PM  8 years agoPost 25
flipteg

rrNovice

Lilburn GA

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so basically, there is a maximum difference between the left and right travel where the gyro is not able to deal with anymore?

i also had this problem with the GP750 on a Pro and i ended up just setting zero pitch at 90 servo arm, but i'm wondering, for those that do, how do people setup rate mode with this gyro? with rate mode setup on a 450 Pro, it ends up having a ton on movement on one side and barely any room on the other. seems to me the GP750 would not be able to handle such an unbalanced movement.

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02-20-2010 04:56 AM  8 years agoPost 26
CrashBoy

rrNovice

Pleasanton, CA - USA

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Limit Setting
Thanks for the posting.

I followed the instructions for the GP750 at least 10 times before giving up and searching for help on setting the limits. After reading up on this Topic I figured out that it was the minimum travel issue. Using the ATV function with rate mode off I measured the travel and it maxed out at just under 50%. After using a smaller radius for the ball link on the servo horn everything worked wonderfully.

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T-REX 450 › GP 750 Gyro limit setting issue/question
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