I meant to reply to this ages ago.
The UK flying mile record is about 80mph and the FIM (world) record is
indeed about 130mph. Mike Corbin (the same Corbins who failed to make the
Sparrow) is supposed to have achieved 175mph in 1976, but I haven't been
able to find out who sanctioned and timed the run(s). These records were all
set in the semi-streamlined class, where the rider must be visible from the
sides and top, with the exception of the riders hands.
You can get to 140mph with just 20bhp and full streamlining, if you get your
aerodynamics right.
Paul Compton
www.evguru.co.uk
www.sciroccoev.co.uk
www.bvs.org.uk
www.morini-mania.co.uk
www.compton.vispa.com/the_named