Align/Telebee Gyro tail holding question

[TeamMishap]

I still don't have all this gyro stuff figured out yet.

Should this gyro hold the tail steady on the ground? When tuned in, in heading hold mode, shouldn't it just lift off and the tail hold straight?

As it is, I have to give right rudder to keep the tail from swinging to the right. It's not death spiraling as it would if I had the gyro reversed.

So is this input normal to overcome torque or do I need to dial more gain into the gyro?

Thanks for any answers or thread referrals.

John

[DavidH]

Sounds to me like you don't have the throttle and pitch curve set correctly.
If the throttle is behind the pitch, even the best gyro is going to have trouble holding the tail.

David

[TeamMishap]

My five point pitch is:
50 69 83 93 100

Five point throttle:
00 30 65 85 100

I forgot where I found these numbers. Looks like throttle is behind pitch...but I have no idea what that really means.

Back to the Finless videos. Geez, I wish I could do something with this heli without having to consult "the Man"

[DavidH]

Numbers on the pitch and throttle curve mean nothing.

Pitch readings and throttle barrel positions are what matters. You can't just load numbers you find somewhere. There setup may be completely different.

As for the throttle being behind the pitch. I mean there is pitch being input and there is not enough throttle to compensate. Adding pitch and the throttle being behind causes the heli to torque the nose to the left. Throttle and pitch have to work together. The idea is to keep the rotor head rpm constant at all pitch changes.

You didn't say what heli your flying. But if it is an electric, the ESC usually has a governor mode.

David

[TeamMishap]

I'm trying to fly a Trex 450XL. Ugh. I should have stuck with the RTF fixed pitch junk. This is waaay over my head.

Dave, I see you are from AL. I'm moving to Montgomery in July. I know Birmingham is quite a bit away, but do you know of any hobby shops in that area?

Thanks for your help. I've gotta figure this pitch/throttle stuff now

[DavidH]

Montgomery is only about 75 miles from the south side of Bham where I am located.
Don't know of any shops in that area. I don't get that way to fly much.
There is hobby shop in Pelham AL. About 75 miles to the north just off I-65. It is called Oak Mountain Hobby. He carries a good bit on heli stuff.
Send me an email when you get here. Maybe we can get together. You going to be stationed at Maxwell ?

David

[TeamMishap]

I'll be at Maxwell for a year. I got selected for a school there. I'm tickled to death to be stateside again come July. Germany has been great, but it's time to come home.

I don't know if I'll have time to play much there. I think I saw a fun fly even in Bham in April. If they have it again in 2008, I hope to go. I'm guessing you may have a part in the planning. My Trex 450XL probably still will not have seen more than 2 inches under the skids by then (laughs).

[cbcelectech]

I had a telebee HH gyro on my first heli (raptor 30). I had two problems, one is the gyro is junk and the other was a non digital servo. I tried to save a buck and never could get that bird to not drift. On another front, if your head speed is not high enogh it will be hard for the telebee to hold the tail.

My recommendation is to get the gy401 and the 9254 by futaba. This setup will set you back two bills, but it's money well spent considering you won't have to babysit the tail. Best of luck to ya

Derrick

[Pinecone]

1) Finless has a video on setting up the Telebee gyro. You have to use subtrim to tune out the drift in HH mode.

2) For a Trex 450 the throttle is way low. You are hovering at about 65% or less throttle (assuming a +/- 10 to 12 degree full pitch range, worse if it is more).

Normal setup is to have the throttle up around 80 - 85.

Low headspeed, not enough tail power. And if this is any of the later versions of the Trex 450, they use a tail reduction gearing to slow the tail down for high headspeeds, so it makes it worse.

3) That gyro isn't very good.

4) Also with that ptich curve, assuming normal setup (0 degrees pitch and 50), you have no negative pitch, which can make it hard to come down in any wind, or to hold the heli on the ground in the wind. Have you watched and followed the Finless videos on CCPM 1 and 2 and Throttle/Pitch Curves 101? You should