How much power do you think can be gained by these exotic throttles? I'd

bet its a fraction of one HP. Given all the other development issues one
faces with any new engine application, is this a battle worth fighting? Why
not just use a "big enough" throttle body and be done with it? BTW, for a
typical rotary powered airframe, how much hp does it take to increase the
top speed by one kt? (I know the answer for a boat, I think it is almost the
same for a plane).

Jon

But of course Jon. Rotary engines are so easy to install and we have all

the

major problems so well solved we are down to discussing trivia :-)>

As I recall top speed is proportional to HP cubed while it is inversely
directly proportional to drag.

Paul Lamar

Actually speed is proportional to the cube root of hp.  And since this is
not a linear function, the amount of hp needed for a 1 kt increase depends
on the starting point.  As an example; if you go 160 kts with 160 hp; it
will take 163 hp to go 161 kts.  Or if you go 180 kts on 200 hp; it will
take 203.4 hp to go 181 kts.

Which, of course, says that Jon is correct.

Al Gietzen

Right Al.  Brain fade on my part. Thanks for correcting that.
Here is an actual example. The base airplane in this chart had 150 HP.

Paul Lamar
 
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