Model Boat Mayhem

Mess Deck: General Section => Model Boating => Topic started by: stunjo on July 23, 2015, 09:59:50 pm

Title: NMM Dark Biter
Post by: stunjo on July 23, 2015, 09:59:50 pm

A friend has built a very tidy NMM Dark Biter.
It has twin  Graupner size 600 Chinese copies and twin ESC's rated at 60amp each.
The trouble is he has just burnt out his third ESC on one side.
I have suggested perhaps he should try a Water Cooled Brushless Outrunner outfit (motor & ESC) as sold by HobbyKing.
None of us have tried Brushless before and therefore a trifle ignorant.
Please can anyone experienced with brushless suggest a suitable Battery/ESC/Motor combination from Hobby King or alternative supplier.
Thanks.

Title: Re: NMM Dark Biter
Post by: Shipmate60 on July 23, 2015, 10:33:34 pm

Not brushless but do the Motors have fans inside the case and what voltage are they running on?


Bob

Title: Re: NMM Dark Biter
Post by: stunjo on July 24, 2015, 11:44:25 am

Bob, thanks for your reply.
The motors do have internal fans the voltage used is 9.6v but the current pulled under load is 30amps and 10 amps without a load.
The ESC's are nominally rated at 100amps but still burnt out but strangely only on the left hand side.

Title: Re: NMM Dark Biter
Post by: Perkasaman2 on July 24, 2015, 12:08:31 pm

What are the dimensions of the Biter?This information will help Mayhemmers to advise. The Dark Class boats used Napier Deltic diesels and had a good turn of speed.

 

Title: Re: NMM Dark Biter
Post by: Shipmate60 on July 24, 2015, 12:17:58 pm

It could be that the motors are at fault. There is a thread on these motors somewhere as on anything above 6 volts will pull stupid currents.
I would have thought 2 x Mabucci 550's would have her running nicely without stupid current draw.



Bob