Master air screw combat props

Master air screw combat props
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Master air screw combat props - 11/10/2007 2:50:41 AM

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Whats the deal with the mas 8x3 props that say combat on'em. Got some from tower today for my Magnum xls.15 on a sig wonder.
Looked on mas's site for info on these combat props (mas marks them as such) an can't find any info on their site about'em.

Ronnie

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RE: Master air screw combat props - 11/10/2007 3:21:02 AM

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Ronnie,

The Master Airscrew 8x3 is the spec prop for .15-sized SSC combat. Master Airscew used to make the props light Blue so that they were distinct, but about a year ago they switched the props bacl to regular black, with "Combat" written on them. Some laquer thinner or carburetor cleaner should take the lettering off if you don't like it.

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RE: Master air screw combat props - 11/10/2007 3:32:19 AM

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I don't mind the lettering, I just wondered what they were... I thought I was getting 8x3 GF series like the 8x4's I ordered also.
I got the new xls .15 for my sig wonder an I'm more interested in speed than pulling power. Which prop do you think I oughta use on it. I have 8x4 gf's an 8x3 combats.

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RE: Master air screw combat props - 11/11/2007 5:37:30 AM

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If you want to go fast with a Mag .15, you might try a MAS 7x5 or 7x6. Depending on the plane a 7x4 isn't out of the question either.

Master Airscrew has been really great working with the combat pilots. We chew up a lot of props, so they are willing to do special things, like make the 8x3 visually different so everyone can see that it's the right prop. The 8x3 really is just the MAS 8x3 GF/2 prop. Most of the MAS line is now the GF/3 version, which is a bit different. I think they are going to keep the 8x3 as the GF/2, but I don't know for sure.

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RE: Master air screw combat props - 11/11/2007 3:16:41 PM

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I replaced the xl 15 with the xls 15 yesterday an proceeded to break the little engine in as per instructions. After that was all done, I fired it up again with the 8x3 prop an tuned it to run like it should. This little engine sounds at least half again as fast as the plain xl that was on it. I think this little engine is gonna be a kick a$$ flyer

I've always been a os guy, but this is quite the little engine IMO.

Ronnie-The Toolman

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RE: Master air screw combat props - 11/11/2007 11:38:32 PM

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Keep in mind that the Mag XL was really over-proped with an 8x3 on the ground, so they never really reved up well. But if you put a MAS 7x4 on them, it ran a lot better. I used the MAS 7x4 for years on those engines in A class combat. The XLS is more powerful, but doesn't unload as much in the air as the old XL does on the 8x3 prop.

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RE: Master air screw combat props - 11/12/2007 1:59:11 AM

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Thanx Montague....

I was gonna try to fly it today, but we had 20 mph wind with higher gusts all day. I don't mind the wind, but with a new plane or engine I like to try'em on a calmer day.

Ronnie

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RE: Master air screw combat props - 11/13/2007 2:10:13 AM

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Only 20? Shoot, that's perfect combat weather.

We've

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RE: Master air screw combat props - 11/27/2007 6:51:59 PM

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Toolman--I have a Wonder with an OS .15 that was used in combat. I have a bag full of blue 8x3 MA props that I have been using. Not particularly fast, but fun to fly.

Greg

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RE: Master air screw combat props - 11/27/2007 11:57:50 PM

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It seems to fly pretty good with the square tipped 8x3 combats. I'd like to go a little faster but I don't know how it'll do with the 8x4. The original xl15 had an 8x4 on it, so I might give them a try one time.

Ronnie-The Toolman

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RE: Master air screw combat props - 11/28/2007 2:24:52 PM

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The MA 8x3 is a really sweet prop for thrust/pulling power but probably not your best choice for speed. I've had several Wonders, my favorite combo is a plain bearing .25 with an 8x6 APC or MA. With that combo the little Wonder really scoots. I did fly one of mine with a .15, it was a Cox/K&B Conquest. I used 7x4 and 7x5APC props. With that combo the plane was about as fast as the plain bearing .25 with an 8x6. But the take-off thrust was noticeably lower- I had to give the plane a pretty good toss, whereas with the .25/8x6 it just about flew out of my hand. But level speed was still very good. The Conquest loved to rev, with the 7x4 it turned a bit under 21k, the 7x5 about 18k on the ground. I tried an 8x4 on it but it turned under 15k which was well below its power band. I would think the XLS is at least as powerful as the Conquest, the 7x5 is probably a good place to start. The Wonder is a clean airplane and goes pretty fast with a little power.

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RE: Master air screw combat props - 11/28/2007 5:23:49 PM

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When we flew OpenA combat, I was running MAS 7x4 props on the Mag XL, and I still use the MAS 7x4 to break in my Mag XL and XLS engines. The 7x4 allows the engine to rev better, which the XL likes. The Mag XL really doesn't like 8" props.

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RE: Master air screw combat props - 11/28/2007 6:09:02 PM

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When we were flying 36" balsa flying wings (27 oz), before SSC came around, we were flying OS .10FPs. When we switched to OS LA .15's on them, we used Master Airscrew 7x6s. The LA's liked the 7x6.

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RE: Master air screw combat props - 12/2/2007 7:04:41 PM

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Makes sense, the LA is a longer stroke than either of the Mags, with the older Mag XL being seriously short-stroked. That and other stuff makes the LA do better with larger props at lower RPM, while the Mags like to wind up with smaller props. The older XL will turn a 7x6, but it really liked the 7x4 better when we were doing it here. Something lower drag with the 7x5 or 7x6 would probably unload well though.

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RE: Master air screw combat props - 12/2/2007 11:16:36 PM

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quote:

ORIGINAL: Montague

Makes sense, the LA is a longer stroke than either of the Mags, with the older Mag XL being seriously short-stroked. That and other stuff makes the LA do better with larger props at lower RPM, while the Mags like to wind up with smaller props. The older XL will turn a 7x6, but it really liked the 7x4 better when we were doing it here. Something lower drag with the 7x5 or 7x6 would probably unload well though.

If you look at the specs on Towers site you will see that the new XLS.15 an the LA.15 now have the exact same bore an stroke. The old XL.15 was a short stroker...

Also the new XLS.15 has a new an improved carb with a bigger bore also. They eliminated the idle stop screw on this new carb too. So far I'm pretty much sold on these "new style" magnum motors. If the bigger ones are as good as these new improved small ones, I might be switchin over from so many O.S's.

I got a buddy sending me a new TT Pro 46 to try out on a fast plane I have. I hear they are a pretty potent little plant also.

Ronnie

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RE: Master air screw combat props - 12/3/2007 2:41:22 AM

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But... Magnum still placed the needle valve 1/2" from the prop arc. And yes, I know there are a couple guys that will spend hours modding the magnums so they run right that will say "Bolt a remote needle on the backplate", but I guess I'm old-school and like an engine that runs well and safe right out of the box. I'll be with OS for a while. Now if they'd move the needle valve, I might give 'em a try. It'd be a sight to see if anything beat the LA-15 on box-stock performance.

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RE: Master air screw combat props - 12/3/2007 2:12:45 PM

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huh, that's odd, I know I looked at the LA bore/stroke a while back, and I could have sworn it was closer to "square" or slightly long-stroke, but that's not what the info out there says now. Interesting. And it is amus