crash due to lack of cyclic

[heli_n00bi3]

arggh...

My 2nd to last crash was due to my raptor 30 tipping itself into the ground (right roll). Today, after i rebuilt it, it happened again, exactly the same. I range checked before the flight that ended in the crash, but I still think it may be the radio. both crashes went something like this at a low (5-6 feet) altitude:
1) drifitng left, because of a left cyclic command from me
2) give it a right cyclic command to go back in the other direction
3) heli flips over to the right and smashes into ground

The mechanics looked ok (instructor went over it with me), so the only conclusion i can come to is that it's either me or the radio doing it. Since I also fly a micro fairly regularly and haven't had this happen, i'm left to suspect the radio, which is a hitec eclipse PCM with PCM receiver (not setup for failsafe).

Anyone seen anything like this?

[jimco]

Sounds like dumb thumbs. Is it trimmed for almost hands off hover?? How much input from you, and are you useing a transmitter tray. The tray will give you much more precise control.

[heli_n00bi3]

I should add "tried to correct back to the left and heli continued right into the ground" ;)

[Alfred]

1st suspect..cyclic servo
2nd suspect...receiver logout.
Borrow/steal a spare servo and replace the cyclic one.
Find some kind of a weight (I used to use a flat steel bar) to hold the heli on the ground.
Have the engine just sitting on fast idle and with a 2nd person keep wriggling the cyclic while you walk backwards with the antenna collapsed and pointing towards the heli.
The 2nd person should tell you when things stopped moving and it should give you a good idea if all is well now.

[heli_n00bi3]

ok... (posting this more for the next poor SOB who might hit this). I believe it's my TX... i just fired the wreckage up on the bench, and it glitched all by itself. I then gave the transmitter a slight shake (don't ask me how I knew how to do this, I've been using an eclipse 7 for awhile) and the glitch went away. Another couple of shakes, and it was back. I'm inclined to say it's the transmitter specifically, because this is a PCM setup, which means that the transmitter has to be sending incorrect data, that is correctly framed (it passes CRC or whatever they use to throw out bad frames, meanign that the data itself from the TX is just bad)

[ausheli]

yeah ok that sounds beleivable, do you think the missus will beleive it when you ask for a new radio, :D

[DebianDog]

:lolol I believe it!