Opignons on max power of a sexy and free dc motor

hello all!
A gui at the worckshop gave me this motor, he thinks it is from a submarine
Made by Alstom in the 90's, pancake-shaped, DC, 43v (weird isn't it?), rated 7,7a, 240w




I could get another one also
I suspect the motor is axial flux because the brushes are axial, and the collector a plate perpendicular to the shaft. but the brushes are too small to pass 20a continuous IMO, and the collector seems small!
I hope to use this motor on a clean road bike, with frame-welded brackets and mounting points!
How much can I over-volt it ? 60v could give some good assist at 10a, and I think that this motor is really efficient!

Here's the catalogue page for it:

http://www.parvex.com/pdf/francais/com/3560-F_axem.pdf

In English:
http://www.parvex.com/pdf/english/com/3564-GB_axem.pdf

thanks Miles! i calculated efficiency at 76% from their numbers. I also examined the patents, and this motor seems to be an axial flux printed dc motor. however, torque is only 0,77n.m...
Does it mean the torque constant is 0,1n.m/A?

Hi bzh,

I make Kt 0.14Nm/A (assuming Kv of 70 rpm/V)

It is axial:
http://www.google.com/patents/about?id=rBNkAAAAEBAJ&dq=3090880
http://www.google.com/patents/about?id=EJp1AAAAEBAJ&dq=3144574

i think i'll overvolt it, and put it in a 20'' custom built trial style bike, gearing for 30kph would give some peep