"RobertR237" wrote in message
...
PS: This is a simple answer to your question but many factors are
involved.
The effort to increase a 200 hp engine to 260 hp may or may not be worth
the
effort and the 30% increase in hp wil not produce an equilivent increase
in
thrust or speed. I don't remember the formula for calculating the
increase but
it is far less than anticipated.

Speed increases at about the cube root of the HP increase, so:

(260 / 200) ^ (1 / 3) = 1.091 or about 9% faster with 30% more HP

But other factors to consider are the increased weight of a larger engine,
the increased fuel burn, and the weight of that fuel.

Eric