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Post by ollieholmes on Oct 9, 2008 2:53:52 GMT 1
I am planning to put three motors into my model to make it more scale but i have a few questions.
1. Is there a speed controller on the market to run 3 motors at once, slowing the two outside ones and keeping the middle one at a constant speed?
2. If not is it possible to link the two outside ones to a speed controller which will slow them as needed and then run the central motor off a seperate speed controller?
3. If i have a three motor set up am i going to then need a 3 or 4 channel radio set up? With a normal model with one motor you have the throttle on one channel and steering on the other. But if you have two motors that are able to be slowed from the speed controller does it still only need one channel or does it need two channels? If it needs two channels then i am going to require a third channel for the rudders to keep her having a sensible turning circle.
Sorry if these questions seem a bit obvious but i want to get as many ansers as possible before i launch into the build.
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Post by Deleted on Oct 9, 2008 3:51:17 GMT 1
I am planning to put three motors into my model to make it more scale but i have a few questions. 1. Is there a speed controller on the market to run 3 motors at once, slowing the two outside ones and keeping the middle one at a constant speed? Markus has a way of doing it with 3 electronic speed controllers and a V-mixer for the 2 outer motors, (center motor runs at a constant speed). All motors will run off channel 2. Rudder on channel 1, then you could have the other things on the other channel or channels. Take a look here. buildthebismark.proboards52.com/index.cgi?board=markus&action=display&thread=1234
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Post by ollieholmes on Oct 9, 2008 4:39:31 GMT 1
That looks feasable. I do appologise i went and read that thread after posting this.
Is the V-mixer the same kind of thing as you use for mixing controls for a V tail on a RC glider? I think i have one knocking around so it would save me money.
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Post by Deleted on Oct 9, 2008 4:53:18 GMT 1
It's ok and yes it is the same.
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Post by Mark on Oct 9, 2008 4:56:24 GMT 1
I'm assuming your only talking about slowing the outer motors for turning purposes. For straight running you want all motors spinning at the same speed, or you're just wasting battery power.
As Sky says. you need three speed controllers and a V-mixer, and get away with a 2 channel control (rudder & throttle). It becomes a bit simpler with a 2 motor set-up as you need one less speed controller, and nobody is going to see whether the centre prop is turning or not !!
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Post by ollieholmes on Oct 9, 2008 5:06:44 GMT 1
Found my V mixer, its knacked. It came in a box with a load of other stuff i brought on Ebay. Never mind, they are not that expensive.
Mark, You asumed correctly. I know you only slow down the outside props.
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Post by markus on Oct 9, 2008 9:53:30 GMT 1
....and nobody is going to see whether the centre prop is turning or not !! ..but i KNOW that the centre prop is turning btw: welcome aboard, olliehomes markus
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Post by nm on Oct 9, 2008 10:13:46 GMT 1
Wouldn't it be better to slow the inside prop?
NM
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Post by Deleted on Oct 9, 2008 10:16:21 GMT 1
Not if you want to turn in something less than a very large lake, center prop has nothing to do with steering. You always slow the prop on the inside of the turn and speed up the one on the outside of the turn, leaving the center one running as is.
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Post by ollieholmes on Oct 9, 2008 18:10:11 GMT 1
Its the same as tank steering. Slow the track on the inside and speed up the outside.
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Post by alexander on Aug 3, 2010 16:42:03 GMT 1
hello,I'm fitting the motors on my Bismarck can you tell me what type of condenser you have used on the motors
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Post by markus on Aug 4, 2010 7:18:26 GMT 1
a standard condenser 47-470nF for alternating current will do. never use direct current ones..
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Post by Mark on Aug 4, 2010 9:17:56 GMT 1
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Post by popeye on Aug 6, 2010 13:20:09 GMT 1
Dear ollieholmes
I use the v-mixer, with 2 power controllers (each from their own battery so I have some redundancy against a battery/controller failure) and it works superbly. My centre shaft is unpowered and that prop freewheels.
With the speed control in neutral, when the rudder goes hard over to one side, the v-mixer puts one motor ahead and the other astern at the same revs so that the ship turns in the rudder direction almost in its own length - very impressive. When moving (forwards or backwards) and turning, then the v-mixer will slow down the motor on the inside edge of the turn and speed up the moter on the outside edge of the turn (if not already at full revs !), again giving a relatively short radius of turn.
I can thoroughly recommend the use of a v-mixer (if you can afford the extra controller !)
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