ORIGINAL: Bigdaddy1963
2.9HP. @15000
Where can I find this program at?
Thank You
Bob
First off, I don’t think you’ll get anywhere near the 2.9 hp advertised by OS, even on a tuned pipe. In fact, Id bet it won’t be very happy at 15K either, especially considering it’s an AX series, that is if it lives up to the recent pattern of lowering its peak hp speed compared similar sized former OS models. By no means does this mean it’s an inferior engine, you just need to realize where it makes its power.
The only engines that I have found to live up to OS’s horsepower rating are the Heli and DF engines.
Real world I’d expect the best power around 11000 rpm with 1.8hp on stock muffler and on tuned pipe 12500 rpm with 2.3 hp from the data that I used to extrapolate the numbers. These Rpm's will leave room to unload into if everything is matched right.
Incidentally, it’s very close in performance to the older 91FX, just think lower RPM for the AX (more pitch).
The props I’d try for the Patriot XL are the APC pattern 12X10, 12X11, 12X12 pattern and Master Airscrew 12X8 S-2 series.
Consider shutting off the engine to land.
The best program I’ve found to help is the “Prop power calculator”
http://www.mvvs.nl/ Left column, click on “utilities”.
I find it far more accurate than “Thrusthp”
Some links that may help get you an idea where the power is:
http://www.rcuniverse.com/forum/m_87...mpage_4/tm.htm
http://www.rcuniverse.com/forum/m_8169105/tm.htm
Hope this helps Bob.