brushless moter convertions

[Tommy LadParticipant @tommylad]

[Tommy LadParticipant @tommylad]

hi i have an ndq jet boat that i would like to convert to brushless, has any one got any photos of a brushless set up i could look at to get a better understanding of how to to it and what i would need

[ARTHUR COLLETTParticipant @arthurcollett48040]

Hi Tommy. Greetings from South Africa. I’m afraid it is not a good idea. We have tried it with a small brushless but the drive train cannot keep up with the increased RPM. Broken couplings was first then bearing het on the front of the jet drive.

Regards

Arthur Collett

 

 

[ashley needhamParticipant @ashleyneedham69188]

I am not sure any will have here, but you never know !

 

A brushless motor is just a motor, so there is no magic involved, but the fixing is at the rear, against an upright bulkhead, if using an out-runner (as the outer casing turns..and this has the output shaft on it) which is what most of the larger ones tend to be,

An in-runner is just like a normal can type and mounts in a similar fashion

 

What motors do you have at present? and how are they mounted and what couplings,..picture?

 

   A brushless controller would also be required.

 

Ashley  (beginning to be a brushless man as currently building something with a brushless motor in !!)

whoops just seen the second post. These motors will rev like the devil, and need to be chosen with care so you dont over stress the existing works…as per experience above . They  are rated as so many revs per volt, so its easy to calculate , given your chosen battery supply, how many revs any particular brushless motor will theoretically get up to, and purchase accordingly.

 

Edited By ashley needham on 11/11/2010 21:53:35

[ashley needhamParticipant @ashleyneedham69188]

Just as an aside, the brushless in-runner i have , a tiny thing 20mm diameter by 30mm long, is billed as a 280-370 (can) upgrade, but at 3600 rpm/V would achieve 26000 odd rpm as against 18000 or so rpm of a “speed 280” motor on 7.2v   AND it can take 9.6v which gives ..ooo… 36000 ish rpm.  A bit of an upgrade that , on a small speedboat !!!!

 

Ashley

 

hhmmm   I converted one of those RTR Severn lifeboats with two speed 280 motors a while ago….I wonder….

[Mark Beard 1Participant @markbeard1]

There’s nothing intrinsic in the high speed of these motors.  With more turns on the windings you get more torque and a lower speed from the same battery voltage.  Don’t try this at home though, you can’t re-wind these motors as easily as brushed motor armatures.  But I do wonder why brushless motor suppliers procure such high speed motors which are not so suitable for most model boats.  Mark

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