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For variations in power with airspeed the relationship is:

V2=V1 x cube root(hp2/hp1)

Comparing a 160 hp 195 knot Lancair 320  to a 180 hp Lancair 360 and
assuming all other parameters are equal, the difference in speed between
the two aircraft due to hp alone is 7.8 knots.  

In this case a 12.5% difference in hp resulted in only a 4% difference in
speed. I just thought that you hp heads should know that the relationship
between hp and speed is not linear.

Another way to put this is -- to cruise your Lancair twice as fast will
require  8 times the hp.

Jim Frantz

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Please send your photos and drawings to marvkaye@olsusa.com.
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