401 on my trex 450

[Arwel]

Just flown my 450 V2 Trex for the first time and when i give it full + collective, the tail yaws out a little then comes back into line . What do i need to adjust so it stays in line???

Thanks guys

[Thomas]

Sounds like you are bogging the main rota which slows the tail too so you, could up your head speed or see if you have too much pitch.

[Twister3D]

Just flown my 450 V2 Trex for the first time and when i give it full + collective, the tail yaws out a little then comes back into line . What do i need to adjust so it stays in line???

Thanks guys

I have a 401 and S3154 on tail, mine does the same and I only have -8 +8 on pitch, just swings a few degrees and then pops back ?
I have 0-35-65-85-98% throttle curve
Idle up = 98-85-65-85-98%

Could that be our problem?

[Arwel]

ok, so nothing to do with the gyro then?? Running 10 + and -. I think i'm running it at full rpm

[Twister3D]

Here's another thread ongoing, so keep tabs on this 2

http://www.rcheliaddict.co.uk/showthread.php?t=5426

Im gona change my curve to 0-35-85-85-98 see if that helps and up my gain till it wags then drop back a bit

Dave

[Twister3D]

Sorry Arwel didn't mean to hijack
its just that we needed the same answers

[Arwel]

No problems matey Let me know how you get on!

[Arwel]

So would it be a good idea to up my headspeed at mid or zero pitch??

[bigglesbutler]

Increasing your main rotor rpm increases your tail rotor rpm because they are driven together. And because you are getting more rpm with the tail rotor you will get more power from it, allowing the gyro more power to keep it in line. The formulae for lift states that lift increases to the square of the speed of the blade. So increasing the speed a little actually has a large effect on the power produced by the blade.

Gawd I sound like such a smug git, but I assure you that isnt my intention. Just increase your rotor speed gives more power, and yes that was a roundabout way of saying that XD.

Si

[Leebert]

Electrics don't mind a bit of overspeeding (unlinke a glow heli which might get upset) so you could try a curve like 0-60-85-100-100 in normal & 100-100-90-100-100 in idle up.

That will help you have your headspeed before you need it rather than trying to build it up whilst you are loading the head up with lots of cyclic or collective.

[LipolyGone]

I had this same problem when moving over to the new motor that the v2 uses, its a monster of a motor with huge amounts of torque which kicked the tail round if pitch was applied to quickly. This is what caused my problems on the Mini Titan. I eventualy took the motor off & went back to the softer motor that was in the original v1 se, that solved all my problems. I'm sure some one mentioned using the small round disc with the 9650 at the time as I was using the 4 bladed arm & had reduced my end points to get the tail not to bind hence reducing the servos efficiency.
I have yet to fly my v2 se & am sure I am going to have the same problems again as you guys are experiencing.
Martin