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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Tachometer Readings >> F-22 PTS Evolution Mystery Motor
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F-22 PTS Evolution Mystery Motor - 6/26/2010 4:26 AM   
_Tommy D



Posts: 680
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From: East Islip, NY, USA
Status: offline 		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


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RE: F-22 PTS Evolution Mystery Motor - 6/26/2010 9:07 AM   
Ernie Misner



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

Thanks,

Ernie

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RE: F-22 PTS Evolution Mystery Motor - 6/26/2010 10:11 AM   
MetallicaJunkie



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From: Donna, TX, USA
Status: offline 		muffler looks like an ultra thrust b y nelson http://shop.vendio.com/RossiEnginesUSA/zoom.html?imgNo=2&title=Muffler%2C+Ultra+Thrust+Sport%2C+Rossi+65%2F91.+UTSM90&images=ULTRA_61_91_L.jpg+Muf_Nlsn90_Sprt.JPG

< Message edited by MetallicaJunkie -- 6/26/2010 6:16 PM >

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RE: F-22 PTS Evolution Mystery Motor - 6/26/2010 8:00 PM   
_Tommy D



Posts: 680
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From: East Islip, NY, USA
Status: offline 		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

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RE: F-22 PTS Evolution Mystery Motor - 6/27/2010 10:46 AM   
MetallicaJunkie



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From: Donna, TX, USA
Status: offline 		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

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RE: F-22 PTS Evolution Mystery Motor - 6/28/2010 5:17 AM   
proptop



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Status: offline 		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.

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RE: F-22 PTS Evolution Mystery Motor - 6/28/2010 5:37 AM   
_Tommy D



Posts: 680
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quote:

ORIGINAL: proptop

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.




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?

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RE: F-22 PTS Evolution Mystery Motor - 6/28/2010 7:34 AM   
proptop



Posts: 6623
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Status: offline 		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

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RE: F-22 PTS Evolution Mystery Motor - 6/28/2010 7:09 PM   
_Tommy D



Posts: 680
Score: 100
Joined: 2/17/2004
Last Login: 1/6/2013
From: East Islip, NY, USA
Status: offline 		Ok, so with no numerical marking I am to gather it's a 45? That works for me.


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

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