RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 463 views
Helicopter
e-
Century Radikal E640 - Swift 16 NX
› Swift, CSM 560 Micro, 9254 servo?
01-25-2007 07:35 PM  10 years agoPost 1
smoothound

rrVeteran

Lancing, West Sussex, UK.

My Posts: All  Forum  Topic

I'm running the above on a pretty simple Swift setup, 4s Axi 2826/8 and P60.

Bird is standard in tail dept but on a standard star servo arm around 17/18mm I can crank gain on Tx right up to 150% with no wagging at all in hover. CSM seem to recomomend around 80-100% gain.

Is anyone else running a similar setup? Should I fit a longer servo arm?

Any pointers would be happily received

Phil

PM  EMAIL  Attn:RR  Quote
01-27-2007 04:57 AM  10 years agoPost 2
Wheelhaus

rrVeteran

Denver

My Posts: All  Forum  Topic

gain is relative, a high setting isn't necessarily good. What's your headspeed? A low headspeed will make the tail less responsive, allowing you to use a higher gain setting. A higher headspeed makes the tail proportionally more responsive, so you need less gain.

..........
Dave

PM  EMAIL  Attn:RR  Quote
01-27-2007 05:47 PM  10 years agoPost 3
Colin Mill

rrVeteran

England

My Posts: All  Forum  Topic

Hi Phil

Sounds like you are doing quite well. My guess is that you have a good example of the servo on the tail to get up to 150% on the tx. The arm length sounds fine. We often use arms of 20mm but if you increase the arm length you need to check that it does not induce an instability in fast sideways flight and other high tail load situations. (There is an interesting thing about the tail geometry that basically causes the mechanical gain of the linkage between the pitch slider and the blades to increase as you get towards the extremes of pitch in either direction. A short servo arm and big angular throw of the servo acts in the opposite direction with the movement of the pushrod dropping off towards full travel and the two effects somewhat cancel out. A very long servo arm with a small servo throw leaves the linkage with a rising gain at the end points so can lead to too much gain in the sideways stuff.

Don't worry about the high gain figure. We have not found that high gains with our gyros leads to a shortening of servo life.

Best regards

Colin (CSM)

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 463 views
Helicopter
e-
Century Radikal E640 - Swift 16 NX
› Swift, CSM 560 Micro, 9254 servo?
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Thursday, December 14 - 12:46 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online