Does anyone know the H.P. of different engines like a OS.46 and a evolution .46 and the difference between a .46 and a .61? Etc...

If you are asking about horse power, you can pull up the OS web site and find out all the specs for any of their engines. Good Luck, Dave


http://www.osengines.com/

However, take all manufacturer's specs with a HUGE grain of salt. Many of those numbers do not reflect real world perfromance. In addition, manufacturers use different methods to determine they specs so comparing the numbers between different brands is difficult to impossible.

Ken

As Ken mentioned the manufacturers numbers are sometimes... well, manufactured. I tend to look at what size prop the engine can use and maybey what RPM range it spins that prop. If you look in these forums you can find "independant studies" where our fellow modelers with reletive scientific accuracy have tested many of the commonly used engines with various props and posted the resulting numbers. I tend to trust these independant researches a little more

I agree on the manufacturers specs, i usually go down to the "tachometer readings" forum in the engine section and look at prop/rpm numbers for a given engine as go from there. I also use the ThrustHP calculator to plug in the prop/rpm numbers to give me an idea if a certain engine will perform the way i need it on a certain plane.