At 07:22 PM 9/10/99 -0500, you wrote:
>Hi Tom,
>
>I came across a Stylus prob I can't seem to work around. I'm setting up
>a 2-channel V-tail HLG with a Stylus (with GLID card). The plane, has
>2 HS-80's for servos. One of them was flaky and would not center
>correctly. I took it apart, but found nothing to clean in the pot.
>
>Anyway, I bought a CS-21 just to try it out. The specs said the speeds
>of the servos were "close", but after trying them out, the CS-21 appears
>much faster.
>
>I thougth I could use the DELAY feature of the stylus to slow down the
>faster servo. This appears to work fine... except with the V-tail mode.
>With the V-tail enabled (mode B I tried, did not try mode A), if you
>slow the elevator servo, the slow applies to the elevator *function*.
>I.e. it slows down both servos when the elevator stick is actuated, as
>opposed to slowing the *servo* plugged into the elevator slot.
>
>I also tried a C-MIX tied to the elevator servo, but it had the same
>effect.
>
>Do you have any suggestions? I can take the servo back and get the
>HS-80, but I thought I'd like to try this newer smaller servo, since
>I've heard good about them.
>
>Thanks for everything,
>
>Jon Stone
>
>PS Feel free to copy RCSE on your answer if you think it will be
>helpful to others.
>
Hi Jon,
The Channel delays nor the Mix delays will allow you to delay just one
flap, one aileron, or half of a v-tail. Either you delay the composite
channel (left and right aileron, left and right flap, or elevator function
with both ruddervators) or you don't.
Even if you think that you might delay an auxiliary channel such as the
gear channel, then mix the delayed gear channel into, let's say left
ruddervator (rudder function) in the C-Mix menu, no delay will be present
except to the gear channel, in this case. The delay is performed at a very
low level in the software and the resultant delay cannot be used as a
master input in the C-Mix
menu.
If it sounds like I have thought this through, I have. In fact, I tried to
do it for nearly the same reason that you cite. I had one servo that was a
bit slow (JR-351) and I wanted to slow the faster flap servo to match the
slower servo. Although the slower servo didn't seem to cause any
perceivable induced roll when entering landing mode, I was still bugged by
the delay. I ended up solving the problem by loosening the case screws on
the JR-351 and then gradually re-tightening them in small increments while
rotating in
an "X" pattern.
In your case, I would strongly recommend using the same servos for both
ruddervators. One note of caution. The CS-21 and S-90 servos (same model,
different distributors) have a VERY large deadband, which I'm sure was done
at the factory to minimize buzzing (overshoot and/or insufficient
dampening) rather than investing the money to re-design the servo
controller for the faster and more powerful motors found in these servos.
The net result is that the servos have poor centering characteristics which
is quite visible if you have tight, slop-free linkages. On the other hand,
the CS-20 and S-80 seem to center fairly well, albeit slightly slower
transit time and a bit less torque. One other caveat, the extra torque and
speed of the CS-21/S-90 places a heavy load on the battery thus noticeably
reducing flight time. You should do just fine with CS-20 for the
ruddervators.
Stylus Boy,
Tom Hoopes ([EMAIL PROTECTED])
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