pitts_pilot(at)bellsouth.
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 Posted: Mon Oct 11, 2010 4:02 pm Post subject: 1st answered 2nd question about rudder trim |
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On 10/11/2010 6:56 PM, Marcus Cooper wrote:
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Linn,
I had a similar idea but never could find any 12V servos. My plan was to
use an inexpensive servo driver designed to test the servos, but again never
pinned down a good 12V system, how is your search going?
Marcus
Do not archive
The model airplane servos are PWM (pulse width modulation) and need 5V,
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GND and a 5V pulse. I'm not looking for 12V servos. They're all too
big and heavy, and they don't normally go to a set position. The 'zero'
of the model servos can be set by length of the pushrod or by programming.
Plan 1 is to use a programmable processor (Stamp Computer) to create the
pulse and drive the servo. Power for the processor can be a simple 7805
or a converter that plugs into a car.
I've already written the program to drive one servo, and it's easy to
port to two servos. One neat thing the program does is center the trim
on power-up.
Plan 2 is to use my MGL panel to drive the servo. MGL has said that
using similar programming thatg the PWM autopilot does can be used for
the PWM trim, and they have put it on the list of improvements.
I like the small size of the model servo and ease of installation.
They'll mount on the bottom rib of the rudder and outboard rib of the
aileron.
Linn
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