Well here is the motor I am using

http://www.headsuprc.com/servlet/the...0-Sport/Detail

It is supposed to be capable of 250 watts. I have tried an APC 10x5 E prop and an off brand 9 x 6 three blade so far. Neither prop has been wonderful.

Wolfe

Wolfe,

Let me know if you got these props well balanced before putting on the motor..

Chen

I did balance the 10 x5, but not the 9x6 3-blade

Wolfe

Originally Posted by wolfewinde

I did balance the 10 x5, but not the 9x6 3-blade

Wolfe

What's your AUW on the P-40?
Heads Up says.. Flying Weight 22.9 - 26.5 ounces AUW

If that's the case, you should have AT LEAST really good vertical performance with the props you're using. Do you have a watt meter? I would get some numbers from that, and then determine if you're getting the power you should be getting out of that motor. If everything checks out, there may be a problem with the airframe itself. I've had issues with my GWS Zero where I had to change the incidence on the wing a couple of degrees to get it to fly properly.

It's about 27 - 28 oz

Wolfe

Originally Posted by wolfewinde

It's about 27 - 28 oz

Wolfe

Yeah, that motor should be plenty for the P-40.

I might try a Parkzone 9.5 x 7.5 two blade and see what happens. Will probably be too many amps WOT, but not by much, and I am running a 30 amp ESC.

wolfe

Originally Posted by wolfewinde

I might try a Parkzone 9.5 x 7.5 two blade and see what happens. Will probably be too many amps WOT, but not by much, and I am running a 30 amp ESC.

wolfe

Go for it! Let us know how that works out. I hope to hear good news.

If you're still having issues after that, I would start considering the airframe as a possible problem.
Also, if you can get a little video of it as well, that would help.

Well I scrounged around and came up with an APC 9 x 7.5E prop. I will give that a try and see what happens. Not sure when the weather will cooperate again - maybe late this afternoon, but it looks on the edge

Pitts - I might consider a trade - what do you have that you would be willing to part with? Mine is not busted up at all, just a crack in the cowl. Will try to put up a pic later.

Wolfe

OK - so I gave the P-40 a little love and touched up the paint nicks, put on the 9 x 7.5 prop, and 2.5" wheels. We will see if she flies any better now. If not, I think she is history.

Wolfe

Originally Posted by Hit N Run

Oh man, I was hoping it wouldn't be THAT big of a difference to obtain the same performance.

I guess i'll be hunting on ebay for people selling the older EPS version.

Woah! - Let'd be clear I'm not comparing EPS with EPO, I'm comparing the generation I warbirds - Spit, Me109, Corsair, P51 and Zero which were all around 34-36" wingspan with the generation II - P40, FW 190 which are up around 40" wingspan and quite a bit more substantial in their structure. There is a weight penalty with EPO but not that big! Iv'e got gen II birds in both EPS and EPO and I would probably use the same motor in both.

And by the way I hate 3 bladers. Might look good but they don't work as efficiently as two bladers in the sizes we use - something to do with Mr Reynolds I'm told

For a crash (no pun intended) course on props see here http://www.airfieldmodels.com/inform...propellers.htm

and his story is

"In our realm, the most efficient propellers are two bladed. Because the diameter of our propellers is so small, multiple blade propellers disturb the air that the trailing blade is entering. Therefore, 3 and 4 blade propellers are less efficient."

I disagree !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The molecules of air are the same size in any scale. There for. The small prop blades we use ....slide in between the molecules easier & with less friction !!!!!!!!!!!!!!!

We are more efficient when using 3 or more blades.

Well I don't know about 2 vs 3 blades - haven't used 3 blades much.

BUT - I did sneak in one flight one the P-40 just before dusk and she did fly much better on the 9 x 7.5 prop. She is faster, but the speed does seem to agree with her.

Wolfe

Originally Posted by wolfewinde

Well here is the motor I am using

http://www.headsuprc.com/servlet/the...0-Sport/Detail

It is supposed to be capable of 250 watts. I have tried an APC 10x5 E prop and an off brand 9 x 6 three blade so far. Neither prop has been wonderful.

Wolfe

Wolfe,

I have looked and looked and really can not get any "Technical" Motor Specifications or Motor constants to allow for On-Line estimator work given a Propeller size/Pitch, Battery selection and ESC.

I looked at:
http://www.headsuprc.com/servlet/the...0-Sport/Detail

I looked at:
http://www.flybrushless.com/search

and nothing.

I would use the APC 9 X 7.5 Slow Flyer and measure your AMP (current) draw and see if this comes anywhere close to the maximum Rated for this Powerup 450 in as far as AMPs and Watts.

The reason I am recommending the SLOW FLYER "is" because this model needs Thrust and Airspeed as it is pretty heavy 28oz.

I have used APC SLOW FLYER with very good results on various models and it does the model very good.

Carlos