ok mate Im new to all this never built a boat befor just wounderin if you new any one that I could get boat building tuitions off jeff

Hi
Sorry to hear that. Graupner's 900 bb motor is rated at 6v to 40V 1.1amp no load to 8amp at max efficiency. The stall current is 54 amps. it would appear from this that a 50amp speed controller should suffice (I would suggest a 40/50 amp fuse however, in case of a siezed/locked prop). However everything would need to be free running (ie no misaligned motor to shaft drive) and no tight spots on the prop shaft or thrust bearings. Were you running completely dry, some bearings require water to lubricate. I am not sure of the maximum voltage on your ESC but if it is 12v then a fully charged SLA would exceed this. Recent experience at our club site suggests that many of the far eastern esc's do not take kindly to any over voltage. I believe the problem lies with the output wires being soldered too close together on the unit, causing a short when overheating, and yes lots of smoke and heat.
Dave

ive recently had dealings with one , with a 900 motor it caught fire after about 5 mins ! the boat hadnt even got into the water as its being set up on my bench .

HI Dave, is this Barnstormers in Cheshire ?
Tried that, nothing listed under esc's, do I need to phone or are they just on line retailers ?
Les.

Thanks Dave will check that out, deal currently offered is 2 for around A£30.
Cheers Les.

HI Bluethunder
Club members have them and they work OK. However one of our local model shops is stocking a very similar item at about the same price so maybe a search on the internet will save you buying from HK. Can't see the item on their web site but contact details are there http://www.barnstormersmodelsonline.co.uk/index.php
Dave