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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Titan SE - GP750 gyro - how to widen limits?
01-17-2010 08:48 AM  8 years agoPost 1
meowsqueak

rrApprentice

New Zealand

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I'm helping to set up a Titan SE with an Align GP-750 gyro. I know how to *restrict* the tail servo limits by moving the rudder carefully left then right while in the right gyro config mode (and rate mode).

However, there seems to be a lot of spare space in either direction that I am unable to reach while setting the travel limits. Essentially, I'd like to set much wider limits but obviously the rudder ATV values don't affect this. There doesn't seem to be a way to set these wider limits if you can't get the servo to travel there in the first place.

One idea is to put the control rod on the servo horn with a larger radius, but it still raises the question - how do you tell the GP-750 gyro to increase (widen) its travel range?

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01-17-2010 12:32 PM  8 years agoPost 2
M S Robinson

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UK

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I am not familiar with this gyro however I imagine it works like others in terms of setting limits.

What I do to set the correct horn radius is plug the servo direct into the reciever and with atv set to 100%, see which hole will give me a full range of movement from stop to stop on the tail rotor. Yours sounds like it needs moving outwards. Also ensure the linkages are close to 90 degrees at neutral. That should give you a good starting point. After this I rewire the gyro into the system and use the config mode to set the correct end points in the gyro. One this is set then I check there is no binding in rate mode. Then I set a gain of 60% and fly it.

Adjust the gain up/down until there is no wag. I tweak the linkage to get no drift in rate mode, and reconfigure end points in the gyro each time to ensure there is no binding. Once rate mode is setup well I tune the gain for heading hold and thats it.

I hope this helps.

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01-17-2010 01:22 PM  8 years agoPost 3
SC Raptorman

rrVeteran

South Carolina

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You should go out on your horn to get more throw and then set your limits.

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-17-2010 01:24 PM  8 years agoPost 4
steve 01

rrProfessor

Grand Rapids MI

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without question the servo arm needs to be longer(I second the previous post)

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01-17-2010 01:37 PM  8 years agoPost 5
M S Robinson

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UK

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When you installed the linkage on the horn which manual did you use? I just read the manual for your gyro and it says use 10mm. This sounds way to small. The raptor manual says 13.5mm which shounds a lot better although you may need to go further out than this. I would always tend to use the aircraft manufacturer linkage recommendations rather than the gyro manufacturer ones. They don't know what you are installing the gyro in.

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01-17-2010 06:10 PM  8 years agoPost 6
meowsqueak

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New Zealand

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Thanks everyone for your replies so far.

I used the Raptor manual to set the ball position (13.5mm), but it looks like that isn't far enough out either. It sounds to me like the only option is to go another step out, which can be done.

It's a shame though, because the servo can easily turn as far as required, it's just the gyro that scales it down to a total range that is too narrow.

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01-18-2010 08:47 PM  8 years agoPost 7
Richardmid1

rrProfessor

Leeds, England

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The ATV's DO affect the limit travel, I always have to go to 120-130% to get full travel with this gyro. Remember you have to go left slowly and carefully to the limit of travel then do the same to the right straight away. If your thumb twitches on the stick and goes slightly in the opposite direction it will remember that position and any further travel wont work.

I had the same problem, I thought the gyro just recognised the maximum position regardless of how the servo got there, you need to do it in one constant movement other wise you will have to do it again.

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01-19-2010 09:21 PM  8 years agoPost 8
meowsqueak

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New Zealand

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Richardmid1 - I tried setting the rudder ATV in one direction to 0% and 150% in Rate Mode, on the bench, and I get the exact same travel as at 100%, so perhaps I've got something set up differently to you?

Personally I wouldn't expect the ATV to directly affect travel, but I would expect it to affect 'dynamic travel' (i.e. gyro behaviour in flight) because it's meant to control the piro rate, and of course this determines the tail blade pitch, which is determined by the tail control position.

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01-20-2010 10:27 AM  8 years agoPost 9
Richardmid1

rrProfessor

Leeds, England

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Rudder Dual Rates affect piro speed on this gyro not ATV's. If your servo is having to go nearly 180 degrees full left and right then your servo arm is too short however you should still see different limits if you have played around with rudder ATV's. You say you tried 0-150% in ONE direction, maybe you have to increase the ATV's in BOTH directions? Try that. Remember to move your stick in one smooth motion with no pauses or tooing and frowing, you can pause after you have reached the left limit then do the same for right limit, remember to do left first then right. I also set mine in Heading Hold, I dont know if it matters but something else worth trying.

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