Technical, Techniques, Hints, and Tips > Radio Equipment

RADIO CONTROL - 3 Throttle

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Adrian:
Hi all,
My first contact through this forum and I hope someone may be able to help me. I am refitting my 1:24 scale Vosper MTB to fit 3 motors, shafts, props etc instead of the single motor as at present. I have managed to sort out which way the 3 shafts rotate but my query at the moment is to do with controlling the motors. Does anyone know if there is a r/c transmitter system out there which has 3 throttle controls or knows of a simple way to adapt a 'normal' 4 or 6 channel transmitter? I think the Futaba 'Navy' has twin throttle sticks but not three. I can rig all three motors to run off 1 speed controller but I would rather be able to control each motor independently if I can.
Many thanks
Adrian

Subculture:
You may want to check out Barry's page on PIC mixers.

http://www.kleefeld.freeserve.co.uk/model/barry/pic01/rc_mixer.htm

They mix the signal onboard the boat, and he does a mixer ideally suited to your application. Inexpensive too.

Andy

RickF:
Although I have never built a three-shafted model, the solution suggested on Barry's site would seem to be the best - and economical too, at that price!

"A mixer to drive the Outer 2 props with rudder mixing assistance as per my type #806 above...
PLUS:
The Inner 2 (or middle one) being controlled to drive ONLY in a forward direction and then only starting after around 1/2 forward throttle stick movement. Further forward stick movement ramps up this motor(s) faster to reach full speed at the same time as the outer props.
This should give reasonably docile low speed control - But lots of welly at full stick!!"

Rick

Doc:
Adrian,
I seriously doubt if there are any 3-throttle, individually controled, proportional radio systems around.  So, the 'mixing' idea, or just not indipendantly/proportionally controling that third motor is what's usually done.  There are ways of doing it.  They sort of depend on your brain/hand/thumb coordination though.  Knowing how I am when playing with boats, I gave up on that a long time ago - lol. (which just means that I'm lazy!)
 - 'Doc

Welsh_Druid:
Is it not possible to do this on the Robbe F14 Navy ?  This TX is expandable and by installing a proportional slider unit you could connect this channel to one motor ( say the central one) and the two throttle sticks  to the other two motors.

You would need separate controllers for each motor though.

Don B.

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