dkshema
rrMaster
Location: Cedar Rapids, IA
My Posts This: Topic Forum | I'd take that DS420 and find a nice deep hole, and toss it in. Deep enough that you won't be tempted to dig it back out.
I started out with a 420, thinking it would be a great servo. But I found out that mine would not move end to end, smoothly. Perhaps if I slammed the stick from side to side, but under normal circumstances it had a very notchy movement, almost as if it were designed to move end to end in on a few steps, not very small steps.
It made my 250 darn near impossible to hover and trim, let alone fly.
I replaced it with the only other servo I happened to have laying around at the time...an HS50 from Hitec. Yes, it's a cheap analog servo, no longer in favor with the Trex crowd, but on the other hand, it's FAST and cost me nothing.
That made a huge difference in the way my little 250 flies. The next step was to move the ball link IN on the arm. I had started out at 5mm, but that only let me get the gain on my 401 up to may 16 or 17, and the piro rate on this little bird was on the order of cyclone speed. At least ten full revolutions per second. I could have used it as a fan to cool people off at the field.
I moved the ball link in to 3mm out from center, was able to up my gain to around 35%, and have full control of the tail.
-----
Make sure your ESC is NOT in Governor mode. Set it to normal throttle mode. Governor mode can make all sorts of nasty habits with the tail.
-----
* Making the World a Better Place -- One Helicopter at a time! *
Dave |
