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Old Jul 20, 2003, 06:56 PM
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Santa Clara, CA, USA
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My First Home Made Prop For bitG Rudder Steering 4mm Pager Motor

Have decent thrust to be used in place of mag-coil actuators.

Any tried it yet?
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Old Jul 20, 2003, 07:02 PM
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Santa Clara, CA, USA
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Prop in motion

These pager motors are getting cheaper and easier to mount.

With bi-directional setting, it can be blended into the vert-stab fin.

With single directional, using two motors. One for each wing tips facing down, we might even use them as flaps to slow down or extra lift to stay afloat. With differential on the two motors for steering
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Old Jul 20, 2003, 07:42 PM
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For regular non bitG setups

I planned to use these motors for the one LiPo BitG settings. If you want to stick to the R4P Rx, you might need to cut up a bursted pico servo's driver board. And still control these pager motor proportionally and bi-directionally. Isn't that great?! I am a little worried that these motors might be a little too hot at 5v.
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Old Jul 21, 2003, 10:27 AM
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Rochester Monroe Cty, New York, United States
Joined Aug 2002
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Too hot

I tried it out using a bit motor for steering. Plenty of uumph for the rudder, but the drive motor slowed when the steering motor was stalled at full turn. You may need a resister between the Rx and the steering motor. I do think something along these lines will work well. Lpark had success with the smallest of pager motors.
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Old Jul 21, 2003, 05:14 PM
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Turkey
Joined May 2002
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If gears are not feasible - or even if gears are used - you could use a sliding mechanism that keeps the motor turning without stalling after a certain torque level is reached - don't ask me how, though.. Of course in this case the motor can not be coupled directly to the control surface, the mechanism should take care of the control movement, and there should be a way of adjusting the limit torque level..

Bulent
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Old Jul 22, 2003, 01:51 AM
Master of the Wind
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TEXAS
Joined Jun 2001
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yea another fast way is a friction plate that gives once the rudder has moved as far as it can the slipping is still loading the motor up but not stalling it... lil plastic disks work fine... =)
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Old Jul 27, 2003, 05:50 PM
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Santa Clara, CA, USA
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Everything seems to be scaling as we scale down the size of our plane including the Lipo battery's chemistry, except the servos.

Actuator mag-coil even with gallopping ghost proportional are not real proportional and it suffers heavy gravity influence error.

Hot wire suffers from heavy battery drain and temp cooling errors.

Where is piezo electic? Are Polymer actuators vailable outside the Labs?

Worm gear servo suffers from heavy Mechanical slop.

Should we bring back the old single coil vibrator with spring cocking?

There must be a cheap and simple solution to replace our smaller tiny proportional RC servos.
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Old Jul 27, 2003, 06:19 PM
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Faroe Islands, Sandoy, Sandur
Joined Nov 2000
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In flight my magnetic actuators have a very proportional feel about them although the response does vary according to airspeed. You really can't tell it's not a servo.

Michael
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Old Jul 27, 2003, 06:28 PM
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Red Lake Falls, Minnesota, USA
Joined Jul 2003
152 Posts
Sorry for being off topic but can u give me a wiring diagram for that circuit board for the wires that come off the board and what they go to pleez? i was going to make an r/c paper airplane but i couldn't get the board to work.

BTW that is from an r/c microsizer right?
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Old Jul 27, 2003, 07:00 PM
tah
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Oslo, Norway
Joined Jul 2003
21 Posts
Electrostatic actuators?

Has anybody tried electrostatic actuators? In principle, a few pieces of tinfoil and Saran Wrap should do it. But I haven't done the math on this scale.

Page 6 and out of this PDF discusses it: http://www.gravity.uwa.edu.au/honour...onours2002.pdf

Probably need to convert the power up a bit though (they use 2.5 kV = 2500V)
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Old Jul 27, 2003, 07:01 PM
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Also see this thread.

http://www.rcgroups.com/forums/showt...threadid=94563
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Old Jul 27, 2003, 07:20 PM
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thank u
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