F-22 PTS Evolution Mystery Motor
 

I'm going to call this one a Mystery Motor. I'm to understand it could be anywhere from 40 to 50 size, and they have no identifying marks on them. Motor came on the F-22 airframe that I purchased for such a low price I "had" to have it.

Broke the motor in on 25% Castor and 10% Nitro. RPM run was on 10% Nitro with a healthy dose of the Sig 25% Caster mixed in.

2 Blade 10x6 Fingali. I don't know where the prop came from, however again thats what was on the motor when purchased.

14,800!

RPM was measured with a Tower Hobbies Tachometer. +/- 10% ????? Again I don't know how accurate they are.

Don't know about you but I'm impressed!

Tommy D

RE: F-22 PTS Evolution Mystery Motor
 

Huh? Doesn't it look just like an Evo from Horizon?

Thanks,

Ernie

RE: F-22 PTS Evolution Mystery Motor
 

muffler looks like an ultra thrust b y nelson http://shop.vendio.com/RossiEnginesU...lsn90_Sprt.JPG

RE: F-22 PTS Evolution Mystery Motor
 

Mystery as in displacement. It's obviously the Evo that comes in these "RTF" models. Like I said in my first post Horizon has changed the displacement on these motors, without any way's of knowing. Short of disassembling the engine that is.

I did not want to say it was a 40, when in fact it could be as large as a 52.

Yes it is a ultrathrust muffler. Was going to go on a OS 55ax but figured would see how this motor would respond. The muffler alone added about 1200 RPM.

Sorry for any confusion.

Tommy D

RE: F-22 PTS Evolution Mystery Motor
 

i have a ys 45 that responded better to a Rossi mini tuned pipe, than a jett exhaust did 800 rpm difference is a lot...was gonna buy an ultra thrust but they are discontinued

RE: F-22 PTS Evolution Mystery Motor
 

The Evolution PTS trainer engine in the F-22 and P-51 (originally the Alpha trainer engine ) with the lower case a on the head is .455 cu. in.

I've seen 14,000 to 14,100 on 15% Powermaster and Tower muffler, APC 12x4 at approx. 500' above sea level.

That is virtually identical to my TT .46 Pro, and O.S. .46 FX w/ the same muff. prop and fuel.

RE: F-22 PTS Evolution Mystery Motor
 

That's good info. Do you have a source I could verify?

Weren't some in the 50 size as well? If so how would you identify them?

RE: F-22 PTS Evolution Mystery Motor
 

All of the Evo engines have their displacement markings on the side of the head...except the Alpha / PTS trainer engine, which is the .455

The Alpha .455 was the first Evolution glow engine back in '03..it was installed on the Xtra Easy 2 and Alpha trainers...then shortly after, they introduced the .40 and .46

IIRC the .36 and .61 were next...the .52 and 1.00, now the new 1.20

RE: F-22 PTS Evolution Mystery Motor
 

Ok, so with no numerical marking <like mine> I am to gather it's a 45? That works for me. :D


Hope to get the model in the air this week. Despite the fact it's turning to me some good RPMs I hope to replace it with the new 60NX and go up 1 in pitch to a 10x7.

Tommy D