I posted M. Jagersand's speed vs power data set the other day.

here it is again and with my quick and dirty extrapolation to 50 m/s

Martin's data:

  Speed (m/s)  Total drag (kW)
       ----------------------------
          15.00         -7.99
          20.00        -19.69
          25.00        -34.74
          30.00        -53.15

Extrapolation:

35.000  -76.50
40.000  -103.63
45.000  -134.59
50.000  -168.00

Converted into Imperial units:

Speed (mph)     Total drag (hp)

33.67           -10.72
44.89           -26.41
56.11           -46.59
67.33           -71.25

78.55           -102.59
89.78           -138.00
101.00          -180.49
112.22          -225.29

So roughly, and I do mean a rough estimate, to go 112 mph in a Vanagon
one needs around 225 hp at the driving wheels.

I have to restate that this is an estimate, no doubt off by a bit, but
it gives one an idea of the power involved.

Alistair

'82 westy, diesel converted to gas in '94

http://www.members.shaw.ca/albell/