My First Home Made Prop For bitG Rudder Steering 4mm Pager Motor - RC Groups
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Jul 20, 2003, 07:56 PM
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jas_Qfix's Avatar

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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Jul 20, 2003, 08:02 PM
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jas_Qfix's Avatar

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
Jul 20, 2003, 08:42 PM
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jas_Qfix's Avatar

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.
Jul 21, 2003, 11:27 AM
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Jgardner's Avatar

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.
Jul 21, 2003, 06:14 PM
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bmutlugil's Avatar
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..

Jul 22, 2003, 02:51 AM
Master of the Wind
AIR MOVER's Avatar
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... =)
Jul 27, 2003, 06:50 PM
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jas_Qfix's Avatar
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.
Jul 27, 2003, 07:19 PM
Only nerd in the village
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.

Jul 27, 2003, 07:28 PM
Registered User
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?
Last edited by red91sit2; Jul 27, 2003 at 07:32 PM.
Jul 27, 2003, 08:00 PM
Registered User

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:

Probably need to convert the power up a bit though (they use 2.5 kV = 2500V)
Jul 27, 2003, 08:01 PM
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jas_Qfix's Avatar
Also see this thread.
Jul 27, 2003, 08:20 PM
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thank u