Euan tells me that the motor is a water cooled Graupner Speed 700 Turbo BB...it looks pretty big when compared to a stock 540. I'm really looking forward to giving it a run this weekend if all goes according to plan and all the bits arrive.
Bill...I have tried the motor VERY briefly on a 9volt cell I had laying around, it frightened the life out of me! I'm more used to a pair of 380's running on a 6 volt gel cel, not this thing! And as for the bathroom tales...I'd have thought a man of your obvious calibre would have known better! Ron Perrott, and old model submariner friend, once famously tested his home brewed torpedoes in the bath...he had to explain to his good lady why there wasn't an end to their bath any more. He'd fired the torpedo and blown the end of the bath off...very embarrassing!!
We shall have fun mate, come the weekend...at least you have a head start on me!