Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: Dicky-P on July 04, 2012, 03:58:44 pm

Title: Battery and motor
Post by: Dicky-P on July 04, 2012, 03:58:44 pm

Could you please tell me if running a 7.2v motor on 8.4v batteries will cause damage to the motor

I have had my boat out once under these conditions and it got quite hot

Thank you

Title: Re: Battery and motor
Post by: barriew on July 04, 2012, 05:14:36 pm

It will almost certainly shorten its life, but is unlikely to cause it to expire suddenly.

Barrie

Title: Re: Battery and motor
Post by: Martin (Admin) on July 04, 2012, 05:26:03 pm

 
Just keep an eye (finger) on the how hot the motor gets.
As a rule, it's too hot if wet finger sizzles on it!

Title: Re: Battery and motor
Post by: scoop on July 04, 2012, 05:51:33 pm

Quote from: dickyp on July 04, 2012, 03:58:44 pm

Could you please tell me if running a 7.2v motor on 8.4v batteries will cause damage to the motor

I have had my boat out once under these conditions and it got quite hot

Thank you

In the good old days I ran a Graupner 8.4v BB Turbo motor on 14.4v (2 x 7.2v Ni-Cads <remember those> in series) with a water cooling coil wrapped around the can, prop was an Octura around 45mm diameter, can't remember if it was a 4 or 6 series prop though.
It (the motor) never did get hot, mind you the batteries came in useful as hand warmers in brass monkey weather  :}
Your problem may be the loading on the motor, try a smaller diameter prop  O0

Cheers
Scoop