ASP 52 is a high torque engine  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> ASP 52 is a high torque engine
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ASP 52 is a high torque engine - 5/6/2008 9:47:45 PM   
yallaair



Posts: 210
Joined: 1/1/2006
From: Floro, NORWAY
Status: offline 		Hi! Today I did some testing with various props on mu ASP 52 with the Hatori #400 pipe. I turned out that this engine swings a 14x6 hapily at above 10100 RPM. This more or less the same as a .91 four stroke. Noise level was comfortable with this setup. I consider this as a strong reading and can recommend this combo to everyone who is looking for low noise and high power to weight ratio. I flew 2 tanks with this setup on my Katana 40 3D, and there was no sign of overheating.

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RE: ASP 52 is a high torque engine - 5/6/2008 9:59:23 PM   
Sport_Pilot



Posts: 7402
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		I think you must need a new tach.

(in reply to yallaair)
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RE: ASP 52 is a high torque engine - 5/6/2008 10:47:57 PM   
jeffk464


 

Posts: 1232
Joined: 10/31/2004
From: cerritos, CA, USA
Status: offline 		Maybe its set on the 3 blade setting.

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RE: ASP 52 is a high torque engine - 5/6/2008 10:58:47 PM   
XJet


 

Posts: 3159
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline
quote:

ORIGINAL: jeffk464

Maybe its set on the 3 blade setting.


No, that would make it read *low* not high.

I'd wager good money that no ASP52 could turn those revs with that prop. The ASP 52s I've got are definitely ported for speed rather than torque and if you do the math it becomes pretty clear that with the bore and stroke of the ASP52, there's just no way you'll be getting that kind of power at those RPMs without significantly lowering the compression ratio (to allow for a lot more air/fuel to be induced or higher nitro levels). Otherwise, it will detonate itself to death.


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RE: ASP 52 is a high torque engine - 5/6/2008 11:20:11 PM   
rainedave



Posts: 4581
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: online 		Just to play Devil's advocate, Pe's spreadsheet shows it would take only 1.53hp to turn an APC 14x6 at 101000rpm. Maybe with the tuned pipe it can do it.

David

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       Post #: 5

RE: ASP 52 is a high torque engine - 5/6/2008 11:51:38 PM   
Gringo Flyer



Posts: 2015
Joined: 1/16/2004
From: Formosa, ARGENTINA
Status: offline 		That seems a little high to me as well. Here are some numbers on the ST90 from the tach forum

ST G90 -
MA Scimitar 13x6
10,500 RPM

SuperTigre G .90
Fuel Fox 5%/20% castor.
Plug==GloDevil 2c
Prop==APC 14x6
RPM==10,590

That puts the ASP just 500rpm or so of a ST 90.

IMO a 14X6 on that engine is too much prop.


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RE: ASP 52 is a high torque engine - 5/7/2008 2:31:21 AM   
Ed Cregger



Posts: 7435
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline
quote:

ORIGINAL: rainedave

Just to play Devil's advocate, Pe's spreadsheet shows it would take only 1.53hp to turn an APC 14x6 at 101000rpm. Maybe with the tuned pipe it can do it.

David



-


Sanye makes two models of .52 two-stroke. The "A" model is the revver. The "S" model, sold in Europe, is the torquer.


Ed Cregger


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RE: ASP 52 is a high torque engine - 5/7/2008 2:38:32 AM   
CustomPC


 

Posts: 344
Joined: 4/19/2004
From: SydneyNSW, AUSTRALIA
Status: offline 		My OS .75AX can only reach a peak of 10,000rpm with an APC 14x6 prop. The throttle response and spool up is pretty good.

What brand of prop are you using? I've tried the MA Schimitar props on several engines and they always show much higher numbers than APC's. My OS .91 Surpass II 4-stroke gets 9,500rpm with the APC 14x6 but delivers 9,700rpm with the MA Schimitar 15x6.

Your data of 10,100 on a 14x6 is useless without knowing what prop you are using. It might be achievable with a narrow blade prop or a Schimitar, but i'd doubt those figures. I'd also like to see how good the throttle response is. If it takes a while to spool up and get on the pipe then it makes for a very difficult flying model.

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RE: ASP 52 is a high torque engine - 5/7/2008 6:58:46 AM   
craigpuckett


 

Posts: 86
Joined: 5/16/2007
From: Rison, AR, USA
Status: online
quote:

ORIGINAL: Ed Cregger


quote:

ORIGINAL: rainedave

Just to play Devil's advocate, Pe's spreadsheet shows it would take only 1.53hp to turn an APC 14x6 at 101000rpm. Maybe with the tuned pipe it can do it.

David



-


Sanye makes two models of .52 two-stroke. The "A" model is the revver. The "S" model, sold in Europe, is the torquer.


Ed Cregger



the sticker on mine says S52 AII so witch is it ? it has both letters?

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       Post #: 9

RE: ASP 52 is a high torque engine - 5/7/2008 10:12:14 AM   
yallaair



Posts: 210
Joined: 1/1/2006
From: Floro, NORWAY
Status: offline 		Hi!
I see that this RPM reading has caused some "surprise". Just for the sake of good order, the reading of 10100 RPM was made on a JXF 14x6. On APC 14x6, the ASP 52 made 10000 RPM. RPM-readings were confirmed by two different tachs. Measured to 4,5 kg (10 lbf) thrust.
Here is a video of a RPM-test with the APC 14x6.

http://www.youtube.com/watch?v=KMmrnIJNcZI

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RE: ASP 52 is a high torque engine - 5/7/2008 10:34:20 AM   
tIANci



Posts: 8111
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
Status: offline 		The ASP 52 is a nice engine, runs happily on 5% even but a 14x6? Wow ... most 46 would be struggling with a 12x6 even without a tuned pipe that is ... that means your ASP 52 with a tuned pipe is as powerful as a Saito 82. However, 10,000 RPM for that engine would be way out of the power curve. Sluggish perhaps? Maybe the pipe makes a lot of difference ... The spool up sounds a little sluggish ... anyways, its great data ...

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RE: ASP 52 is a high torque engine - 5/7/2008 11:24:41 AM   
Harry Lagman


 

Posts: 1109
Joined: 11/19/2003
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: yallaair

Hi!
I see that this RPM reading has caused some "surprise".


Actually, I'm not surprised. It's a good example of how a two-stroke can perform with the right length of tuned pipe. I've seen an OS .50 SX on a long pipe burning 10% nitro pull an even 11,000 rpm with an APC 12 x 8, which is 400 rpm more than the best I've seen from a YS .63S burning 20/20 fuel. That's right up there in .91 FS country.

The ASP/Magnum .52, for all its durability faults, is a very powerful and flexible powerplant. It can pull big lumber but is also effective when screaming with a light prop.

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RE: ASP 52 is a high torque engine - 5/7/2008 2:19:02 PM   
martenson


 

Posts: 297
Joined: 5/14/2006
From: Stockholm, SWEDEN
Status: offline 		I would like to hear it with a light wooden Zinger prop

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RE: ASP 52 is a high torque engine - 5/7/2008 3:13:15 PM   
asmund


 

Posts: 1806
Joined: 11/20/2005
From: Floroe, NORWAY
Status: online 		I can confirm the results, I was there when it was done and both mine and Yallaairs tachs showed the same readings. The pipe makes this 8cc engine effectively a 14-15 cc engine powerwise. This engine is not a revver OR a torquer, it is both. We have the exact same engine and I have broken the 15K barrier on the APC 12-4 (it is tuned of course, but no pipe was used) It depends on how one set up the engine, it can revv small props or lug big ones.

(in reply to martenson)
       Post #: 14

RE: ASP 52 is a high torque engine - 5/7/2008 3:46:10 PM   
Ed Cregger