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brushless outrunners

49inch wooden peraksa

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Going brushless?

Going brushless?

JOHN PARKER with some practical advice

Alan Hazel09/01/2015 20:37:55
3 forum posts
3 photos

can any one suggest which brushless outer runner and speed controller would work well in a Precedent perkasa mtb (49inch large wooden) .

Bob Abell10/01/2015 08:40:14
8951 forum posts
2824 photos

Hello Alan

This would be a good starting point......


For a lively performance, I would fit two sets

I`ll dig out my installation and post it shortly


Bob Abell10/01/2015 09:01:37
8951 forum posts
2824 photos

Hello Alan

If Brushless motors are a bit of a mystery, then I would only fit a single drive

Here are my twin drive models for interest

Any questions, just ask


ellie close up.jpg

brushless motors for ellie.jpg

electron deck.jpg

banking over.jpg

swinging round.jpg

on the bench.jpg


harry smith 118/03/2015 04:05:39
1040 forum posts
1215 photos

Hi All

Brushless are very powerful, I put a Trackstar 17.0T 2400kv 550watts on 3s(11.1volts) Tamiya Falcon buggy as a replacement for the hot brush motor.

It wheel spin for 60 feet on take-off!!

I have found boats require a bit more grunt, but, getting the balance and speed for each boat is a test.

The more experience the better or use forums to help.

The more specs. on the boat the better the answers,also, you speed requirement and run time.

Jeremy16/06/2015 15:03:03
181 forum posts
255 photos


Very helpful article and discussion thread. However, I would still appreciate expert advice on a motor/speed controller/prop combination for my twin proped Amati Riva Acquarama model, still in it's early stages of contruction.

I used a Turnigy D3536-6 1250kv brushless outrunner with a 100amp HobbyKing reversible car speed controller on my 34" Vosper fire tender (maybe a bit of overkill with the ESC but I had started with a 45 amp unit and this was prone to cutting out - overheat protection?). With a 40mm twin bladed Graupner prop, this boat goes well.

I am temped to go for a similar set up for the Riva which is about the same length but maybe quite a bit heavier. It would look much like the kit in Bob's Slo-mo-2. I want the boat to plane well but not to leap out of the water. I have some concern over cooling as the engine room space will be more confined than in the Vosper - maybe a bit more like Slo-mo-2. The is no opportunity to introduce air ducts into the enclosed space.

I am aware that outrunners have a lower kv, eliminating the need for a gearbox. On the other hand, water cooling would be more difficult and the car ESC can not be water cooled.

I think I will have to use Lipo batteries as there would be no room for the 12v 10 cell 5000mah brick which I have in the Vosper. Finally, I would opt for M4 drive shafts.

Any thoughts or advice would be much appreciated.


Mark Jarvis 219/06/2015 22:45:33
217 forum posts

Hi Jeremy

Have looked at brushless myself, look on ebay etc for a watercooled motor mount, tihs may help, also there are watercolled mounting plates for the ESC, also helping keep things under control!!!!

Have you thought about inrunners with smaller props running faster???

Bob's Slo-Mo is quick when he is brave enough to open the power up. Proble is our lake is quite small for very fast boats, dodging ducks is a major problem as well.

Hope this helps


harry smith 121/06/2015 08:43:34
1040 forum posts
1215 photos

I remember clipping one years ago with a 24" tunnel hull (OS40FSR motor).

He was not a happy little duck!!

The next time I came around at half throttle the whole flock was gone!!!

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