Magnum XL.52FS
 

Still breaking in . 10,800 with a Merlin 4stoke plug, Omega 10% fuel, Graupner 10X6 3 blade.

RE: Magnum XL.52FS
 

Borgie, I feel sorry that nobody posted in your thread.[:o] So, I will.:)

I also have one of these. I don't have your prop, but I will tach mine with a MA 12x6 wood.

David

RE: Magnum XL.52FS
 

Dave you silly.
I use this as data storage for future reference , I don't really expect anyone to post a comment.:)

RE: Magnum XL.52FS
 

FWIW,
I get 11,200 with 15% Omega and a MAS 12X6 classic prop.

RE: Magnum XL.52FS
 

Mine ain't broke in yet so I am holding off on anything over 10% nitro. I tried a new Master Airscrew 11X6 3 series (kinda wide blade ) and it did an easy 10,800. Pe gives these a value somewhat higher than the original black props.

RE: Magnum XL.52FS
 

Hopefully my "fuel shipment" will arrive soon and if the weather holds I can get some more prop readings.

RE: Magnum XL.52FS
 

With my Graupner 10X6 3 blade (yup I gotta love them 3 bladed props, sorry) it gave me a still conservative 11,200 on Omega 10%. I will be trying an MA 12X6 Schimitar next.

RE: Magnum XL.52FS
 

I saw you have made a beautiful rig to brake in or test your engine . Can you tell me why the center part of the fuel stopper has to be same hight as the mixture screw ? or does this effect engine performance on small size engine like magnum xls 15 and possibly small vacuum leaks at carburator Cinch bolt and nut?

RE: Magnum XL.52FS
 

Just wondering if you ever got the numbers with the Master Airscrew 12x6 Scimitar prop ?

RE: Magnum XL.52FS
 

Funny coincidence, I ran mine again today. I'm only using 5% nitro. I got 11,240 with a Graupner 11x6 2-blade. I tried a MA wood 12x6 (yellow tips) and could barely break 9,000.

David

RE: Magnum XL.52FS
 

It didn't like the 12X6 Scimitar at all. It runs much better with the 11X6 MA 3 series. And it runs fantastic on 25% Omega. :) I made certain it was well broke in before trying it and only after I was certain it could handle the extra nitro.

RE: Magnum XL.52FS
 

I've been running mine on 10% nitro Magnum fuel with 70/30 synth/castor lubrication, a Fox Miracle glow plug, and a Master Airscrew 12x6 K-series prop. My XL .52 RFS ran just rich of peak power at 10,000 rpms.

RE: Magnum XL.52FS
 

Maybe the yellow-tip wood MA's are a higher load:

http://masterairscrew.com/12x6woodseriespropeller.aspx

I will try some other 12x6's and see if I can get nearer 10,000.

The 11,240 I got with the with the Graupner 11x6 calculates to .96hp and 6.19lbs of static thrust. That actually sounds about right for a .52 4-stroke. I don't know why the wood 12x6 is bogging it down so much. Maybe it's a miss-marked 12x8?

David

RE: Magnum XL.52FS
 

And I was thinking it was just me and my MA Scimitar 12X6 . It didn't like that prop at all. But the 12X5 RevUp did well.

RE: Magnum XL.52FS
 

I like the APC 12 X 5. It is a completely different design from the APC 12 X 6

RE: Magnum XL.52FS
 

Tried a Top Flite 12X6 today and it made 9100 rpm. If you run the numbers it made a decent 5.5lbs and 45mph. Still think the MA 11X6 3 series is a better choice. But i need to get it airborne to be certain.

RE: Magnum XL.52FS
 

This is not the same engine but for reference it may help you feel good about your 52.  I have a Magnum 61 four stroke and it does 10000 with a MA 12x6 Scimitar and 10500 with a MA 10x7 three blade on 15% nitro.</p>

RE: Magnum XL.52FS
 

Ithink the 52 can replace a 40 2stroke but not much more. Still, it has its positive attributes.

RE: Magnum XL.52FS
 

I agree. The 52 four stroke is barely the equivalent to a ball bearing 40 two stroke. The 61 four stroke I have is barely the equivalent to a Thunder Tiger 46 pro. My61 is actually in long term storage, its to heavy for 30 sized planes and it just barely gets the job done on 40 size planes. I like the 70 four strokes a lot better on 40 size planes.