On Sun, 3 Jun 2007 07:44:26 -0400, "WC" wrote:


The plans I have (.pdf file) are the second edition revised 4/2000.
Would that include the "Upgraded" wing?
No, the supplier of the plans denies there is a problem.
Looking at the Rotax 447 w/exhaust and air-filter, no electric but with
B-Drive it looks like 82 lbs. for 39.6 hp.
Hummel's engines are running (according to their website) 37 and 45 hp
at 85 and 84 lbs (is this with exhaust? Can you hand crank the VW? How much
does electric start add to weight? )
Half of a 40HP VW engine will give you 20HP at full rated RPM, which
you will NOT reach with a direct drive prop.
Using a larger engine gives the same results. If an 1825cc 4 gives
65HP at 4200 RPM, half that engine will produce about 37 at 4200 RPM,
and only about 24 HP at 3000 RPM. Do the math.

Fly a full VW and count on a maximum sustained power of 40HP, with
higher power available for short term (takeoff) use.
Is there a better choice of engine for this plane?

Thanks again.



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