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.

I think you must need a new tach.

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.

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

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.

-


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

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.

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

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

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 ...

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.

I would like to hear it with a light wooden Zinger prop

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.

It sounds like someone in marketing is having fun.

I'm under the impression that the S models are sold in Europe only, where sound standards are tougher. But, truthfully, I'm guessing and your guess is as good as mine.

Look at the "Just Engines" material concerning the Sanye .52 two-stroke. A while back they were expounding upon how their .52 was a stroker/torquer (paraphrasing) and how it swung larger props than the "A" version. Now you know as much or more about it than I do. <G>


Ed Cregger

This is the second ASP that I have bought(a .46 and a .52) that has come in drenched in cosmaline,and the second one that I have tore apart and washed the metal fragments out of. I guess when they are assembling them the metal fragments just somehow get in. [:@]

other than that, they are good engines

I will report on the .52 when I get around to breaking it in.(it just came in yesterday)

Was it new in a white ASP box? Did you buy it from Lithium on the 'Bay? TIA


Ed Cregger

Yes to both.

the "TIA" had me baffled Ed,I googled for a while before I found it your welcome[8D]

wasn't any really big stuff just some small metal dust,but enough that I am glad I went there.

Hi!
These ASP two stroke engines are really impressive (.40 -52).
A year ago there were some newbies comming to our field looking for help and they both had Kyosho GX.40 engines with 12x6 Kyosho props in their Kyosho Calmato trainer airplanes.
I told them that 12x6 would probably be too much prop for a their engines but as they did not have any other props with them I desided to test fly their airplanes.
Lo and behold!I was very impressed in the way these engines behaved . That big 12x6 prop didn't bog down that little engine what so ever. The plane performed perfekt with it. Since then I have tried the Kysho GX .40 (same as the ASP .40) in Q-500 pylon and it's one of the most powerful sport engines on the market, ravaling the Webra .40 as being the most powerful sport .40 engine.
The ASP .40 does 14600rpm using a RAM 10x6 plastic prop on 80/20 Castor based fuel (with both it's head shims removed) and that is in line with what the Webra .40 GT does as well.
For instance the MVVS .40 does only 13300rpm on the same RAM 10x6 prop using the zero nitro head.

My Irvine 53 on a tuned pipe and Perry VP30 could give about 9800rpm with an APC 14x6 on 10% nitro and 20% oil castor/syntetic blend and your numbers just shows that twostrokes have a great torque when used with a fullenght quiet tuned pipe.

It sounds to me like ASP and Irvines run better in Europe

Like I said previously, it depends upon which ASP .52 (A or S) you get. Irvine also had some "stroker/torquer" engines that would probably do well, with the right pipe.


Ed Cregger

hi again!
Today I tested my ASP with a different cyl.head. I replaced the standard cyl. head with the one that comes with the O.S Hyper. The result was a increase in power from 10000 to 10300 RPM on APC 14x6. The result was better power and of course far better cooling for 3D. Maybe I will also test the ASP 52 with this cyl.head in my heli, just to see how it will perform compared to the O.S Hyper.

Picture:

http://site.sunnfjordrc.no/index.php...d=40&Itemid=34

I just priced the OS .50 hyper cylinder head. $68 dollars! They are insane!

Now, if I could find a used one in great shape for about $25... 8&gt


Ed Cregger

There should be alot of worn out Hypers around. I have a friend with one, I hope he has not binned the carnage yet as I would love to get ahold of the head on it