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T-REX 450 › Complex Tail Problem
03-07-2008 09:08 PM  10 years agoPost 1
rjhpilot91

rrApprentice

somers point, nj

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I've got a strange and complicated tail problem on my 450. I've got the 401 gyro set up as per the manual with a 9250 servo and I've been having issues setting up the tail in rate mode as per the manual. I've been adjusting the tail control rod shorter to get it set properly however now the tail slider on the shaft is no where near centered on the tail shaft. It is very close to the tail hub and should be more to the center of the shaft.

I've gone over the heli pretty well looking for mechanical defects or problems but cant find any. It holds the nose straight most of the time in HH mode but sometimes it does drift to the left slightly. Theres not a whole lot more room to adjust the pushrod without limiting the travel of the tail in one direction.

Any ideas?

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03-07-2008 09:28 PM  10 years agoPost 2
gian

rrVeteran

AZ

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You're in NJ? have you tried leaving the heli sit outside for a few minutes before attempting to fly? I'd guess it's either temperature drift or your tail link is stiffening up being in the cold (actually that might cause wag instead...). Any of that get you closer?

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03-07-2008 09:34 PM  10 years agoPost 3
vrwired

rrVeteran

Boulder County, CO

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Rate mode setup will cause an offset in your your tail... thats normal.. Dont try to correct that..

Once set up in rate (mechanical) you are then getting drift?
If so..

Recheck for Vibes, Binding, As said earlier - Temperature, Try different gain settings in HH?, Make sure 0 trim in HH,

If you have a fast digital servo, then set Dealy to 0.

good luck

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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03-07-2008 09:38 PM  10 years agoPost 4
ckoelliker

rrElite Veteran

St. Simons, GA

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How close is it to the tail shaft? Like 2-3mm or 8-10mm? The only thing you can do to try to move the point of where the helicopter hovers is one slightly cheat the tail hub so it hangs off the tail shaft a little bit, two you could try to increase your head speed, or thee you might try to change the tail blades. Either way I think that with most helicopters the pitch slider will not be centered when set up in rate mode. With the older t-rex models it was a problem because the tail geometry was soo far off. The pitch slider would bind with the tail hub when set up in rate mode. This would limit the pitch slider from using the full range of motion towards the tail case, and that is the direction that the gyro needs. But they have since fixed that problem so with the newer tails the pitch slider is going to first bind with the tail case. So you will not get full travel for left hand pirouettes, but that is fine because the gyro never needs that extra throw anyhow. Like I said at the beginning how close is it? If it is almost touching I would say you have some sort of issue, but if it is like 8-10mm, and that is just a guess, then I would say that is normal. Even if you just center the pitch slider all it is going to do is return to the same spot during a hover, so I do not see how that will help. And lastly how does it fly? Does the tail hold for sharp punch outs, backwards flight? Does the helicopter pirouette to the right or does it seem lazy?

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03-07-2008 09:49 PM  10 years agoPost 5
Boidman (RIP)

rrKey Veteran

The Home Stretch

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Any chance you're using a low rpm and higher pitch at hover? During setup, that can cause you to need more tail pitch to hold against main rotor torque. Any clue what your hover rpm is?

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03-08-2008 12:39 AM  10 years agoPost 6
LoveMyTrex

rrVeteran

Hamilton,VA

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I have both my helis, trex 450 and 500 setup with the tail blades at 0 pitch. my 450 has a 401 and my 500 has a spartan. my tail holds great with both, no drift, and I have full travel in both directions

600N 55HZ/SAB-55 600V's
700N 91HZ/SB-20 690V2 V's
90SG 91HZ/SB-20 710V2 V's

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03-08-2008 01:19 AM  10 years agoPost 7
Waco

rrApprentice

Bernalillo, New Mexico USA

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setup with the tail blades at 0 pitch
Ala Bobs video is how I set my 401 and I also added right trim. The 401 sees that trim when it boots in HH mode and still has full travel Lt & Rt.

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03-08-2008 01:29 AM  10 years agoPost 8
rjhpilot91

rrApprentice

somers point, nj

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I dont have access to the heli right now but I'll do some measurements tomorrow. I dont think its the temperature since it does it in my house too with no temp changes. I'm not sure about the hover rpm since I dont have a tach, but it seems to be a gradual problem as it wasn't like this about 30 flights ago.

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03-08-2008 02:06 AM  10 years agoPost 9
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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I had a problem which sounds almost like you problem...To fix I bought the T-Rex 450 V2 tail upgrade and now the tail on my 450 works perfect.

Team Synergy, Rail blades, Team Scorpion, V-Team

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03-08-2008 02:08 AM  10 years agoPost 10
Waco

rrApprentice

Bernalillo, New Mexico USA

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I agree as Ive never had to acclimate the 401 even in 30 degree weather and never had a drift problem.

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