View Full Version : GY401 not holding under "harsh" conditions
I've got a GY401/9254 combo on my Raptor 50 that holds the tail just fine when hovering and doing general forward flight, but the moment you throw something tough at it everything goes south. Tail slides for example... I end up coming out of them sideways because the tail drifts out. Same deal for tic tocs. I've tried increasing the sensativity up to 90% on my 9303, but to no avail. The gyro is also set to use digital servos and has the delay set to "0". Is there something I'm missing here?
By the way, my headspeed is 1800.
Thanks for any advice,
-syn
Jonty
08-13-2006, 11:37 PM
I have the same problem but only in hovering so far in the wind. My machine is drifting slightly to the right. I upped my gain to 100%! and still no change. Any suggestions? Same gyro, same heli
flyinfool
08-14-2006, 09:14 AM
The Tail Speedup Pulley (http://www.gohbee.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=50139&Category_Code=1105) available from Gohbee has a dramatic effect on the tail holding power.
This pulley will work equally well in a Raptor or Stinger, 30 or 50 size.
This pulley increases the tail ratio from 4.44 to 5.0 so at your 1800 HS the tail rpm will go from 7,992 to 9,000 RPM.
I have tested tails up to 12,000 rpm to be sure it is safe.
mplourde
08-14-2006, 09:27 AM
Or, just simply try with a head speed higher like 1950 - 2000 RPM before changing anything. This will speed up your tail blades too and you will be able to check if that change...
Am I safe to run head speeds that high with the stock plastic head? The only thing CNC on the bird is the swash, washout base/arms, and the flybar assembly. I have been thinking of upgrading to the kasama or Quick UK head... surely those head speeds would be ok on either of those...
-syn
mplourde
08-14-2006, 09:43 AM
It's recommended to change the Head hub for a CNC part. It's a good investment !!!
BarracudaHockey
08-14-2006, 10:29 AM
That gyro should hold fine w/o a tail speed up pulley but a metal head block and higher head speed would probably help out.
Check that your linkages are silkly smooth, make sure that the tail rod guides are perfectly aligned and shoot a drop of triflo on the rod where it goes through. Inspect that the slider isn't over tightened on the brass collar or it will make the bearings notchy in the tail pitch slider. Make sure the slider is lubed with a little tri flow as well.
All that should be good. I always try to keep the links smooth and everything lubed. If I detach the linkage from the rudder servo (rear mounted), the rod can very easily be moved by hand... no binding or catching. I've been wanting to up the headspeed anyway... I just don't have the power/control that I want. Looks like it is time to place another order with ricks. :twisted:
What headspeed would you guys recomend as a "normal" range for an all metal head?
-syn
BarracudaHockey
08-14-2006, 03:14 PM
2000 rpm puts the hyper in its happy spot of 17000
holy smokes... that is screaming fast! I think I may go ahead and order that setup now. :D
*syn dreams of crazy fast cyclic*
-syn