Ed,

Yes you are absolutely right, my propeller program is made for making
propellers, $125 is a lot if you just want to play around, but for those who
want to make or even buy an propeller the sum is saved in material/work or
buying/sending back unsuitable propellers.
It is used by homebuilders, kitmakers and propeller makers around the globe.

you can try this: not very user friendly but anyway

http://www.eaa.org/benefits/sportavi...ceEstimate.xls

Jan Carlsson
www.jcpropellerdesign.com

"Ed Baker" skrev i meddelandet
om...
Thanks for responding Jan.

Believe me when I say I don't want to start a "flame war" with what
I'm about to say. But, I think a price of $125.00 is more than a
person with my requirements for analysis would want to spend.

I looked at your website, and I think your program looks tremendous
for a person that would like to custom desing a propellor.

However, I think my needs could be answered with a simpler, and less
expensive, software tool.

"Jan Carlsson" wrote in message
...
Hi

With my propeller program comes a sophisticated but easy to use
performance
program. but it is not for free.
a propeller program is useless without a performance program and vise
versa.

Jan Carlsson
www.jcpropellerdesign.com

"Ed Baker" skrev i meddelandet
om...
I'm looking for a spreadsheet (or formulas) that would let me do a
"what if" calculation of aircraft performance when the current
performance, and specs, of an aircraft is known.

For example, if I had an airplane with a stall speed of 45mph, wing
span of 30 feet, cruise speed of 110 ... take off distance, rate of
climb, etc. What would happen if the wingspan were reduced or
increased, horse power reduced or increased and things like that.

Any ideas ???