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Old Sep 22, 2014, 12:28 AM
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Kelly Glass Props

Has anyone used the Kelly glass props, if so are they still being sold?
AL Kelly perhaps not sure.
KELLY PRODUCTS
4616 Harvey
Western Springs, IL 60558



I bought this engine off ebay; .049 modified 190 series engine with a Galbreath head / Nelson plug / TD cylinder / screenless intake and
the Kelly 6 x 3. Seems like the engine hasn't been run.
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Old Sep 22, 2014, 09:32 AM
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I don't think that he still makes them. He is making the Merlin glow plugs now. They were pretty good props. I think he wouldn't mind if you would ask. There may still be some floating around.
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Old Sep 24, 2014, 12:47 AM
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Yea thats what I have gathered too. The old fiberglass prop appears to have never been used seems strong enough to absorb the power of a 09. Perhaps I will use it one day.
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Old Sep 30, 2014, 08:52 PM
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Make a mold off of your prop, and make more?
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Old Oct 01, 2014, 01:34 AM
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Yes could... would be a bit of work the design isn't too shabby strong enough to hold up to some engine for sure. I truly believe the right prop engine combo can be the bases of a good or new plane design. I like some wiggle room to up size in power in lieu of that all naggin need to maximize performance in regards to desired flying. Like most we all tend to be a bit of a prop collector and over the years many many props stored away for the special day they see some air time or at least match up to a engine for a bench run.
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Old Oct 01, 2014, 10:44 AM
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I wouldn't bother making a mold of that one. It is likely a copy of a Presswood, or something from that time. Copying a copy is bound to lose something. A good thing to copy would be a 4.75, - 4.75" APC electric prop. It would hold up to the revs of a good .049 or .06 and get some speed. A 6-3 would be all wound up and no place to go.
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Old Oct 01, 2014, 04:37 PM
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Yes agreed, I would much rather had that prop as a 6x5 for the AP 09 so was wondering if they may still be around. I ended up sourcing a German thin blade Multiplex 6 x 5.5 and a APC Pylon 6.5 x 5 to try.

The Kelly 6x3 may go on the QB .074.
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Old Oct 01, 2014, 10:52 PM
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APC has quite a few good props now. The Kelly ones are quite old now. 1980's? 1990's. I remember him making props back in the 1970's. A lot of the Goodyear control line guys were using them.
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Old Oct 02, 2014, 01:23 AM
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Yes very true the APC selections efforts / field testing sweat equity with their advent of computer design, material selection makes for an affordable product allowing us folks to buy and try without having to gringe over price unlike some of the custom props.
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Old Oct 02, 2014, 05:35 PM
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Quote:
Originally Posted by aspeed View Post
I wouldn't bother making a mold of that one. It is likely a copy of a Presswood, or something from that time. Copying a copy is bound to lose something. A good thing to copy would be a 4.75, - 4.75" APC electric prop. It would hold up to the revs of a good .049 or .06 and get some speed. A 6-3 would be all wound up and no place to go.
The 4.7-4.7 APC would be a marginal choice for a 1/2A prop mold-there are a few problems with it: 1) it's too much prop for a 1/2A, and cutting it down makes for an inefficient prop), and 2) the blades are too thin to get much carbon in to make them safe enough to put that kind of power thru. I don't know about a Norvel, but a Cyclon will spin one of these at 27,500, which is less than it will spin a 6-3.
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Old Oct 02, 2014, 09:20 PM
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27,500 gives a theoretical speed of 130 mph on the 4.75 pitch. 31,000 on a 3" pitch is 93 mph. I am surprised that the blades stay on with the Cyclon and an electric APC prop. A higher pitch prop will unload more in the air too. so it may end up over 30,000. All this is in theory with a clean plane yadda yadda.
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Old Oct 02, 2014, 11:03 PM
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27,500 gives a theoretical speed of 130 mph on the 4.75 pitch. 31,000 on a 3" pitch is 93 mph. I am surprised that the blades stay on with the Cyclon and an electric APC prop. A higher pitch prop will unload more in the air too. so it may end up over 30,000. All this is in theory with a clean plane yadda yadda.
At the time those numbers were collected, an F5D (Electric pylon racer) was turning that prop at that RPM static. Those were 170mph airplanes after they unloaded.... I always wondered how far the glow engine would unwind. I think 150 is possible on the right airframe with the right prop.
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Old Oct 03, 2014, 04:46 AM
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The electric ones look a bit dangerous with their very thin blades all the way to the hub.
There is an APC 4.7x4 (for glow) that works fine on the Norvels, I get around 22000rpm on a BigMig .061 engine (with the stock muffler and 10% nitro).

The APC 6.5x5 is very good for .15 engines, but it might be too much prop for the AP09. I have an MVVS .15 that will spin this prop at around 22000rpm.

The Queen Bee likes a 6x3 prop, but it doesn't keep up with a .049TD on that prop though...
I also prefer 4" pitch for throttled applications, but my QB was a little prone to overheating on a 6x4 prop, while throttling was pretty good.
The QB runs very well as a diesel, an RJL cox .09 head is a direct drop in, and now the engine finally works like a .07 engine should.
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Old Oct 03, 2014, 12:41 PM
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Originally Posted by Dave Campbell View Post
At the time those numbers were collected, an F5D (Electric pylon racer) was turning that prop at that RPM static. Those were 170mph airplanes after they unloaded.... I always wondered how far the glow engine would unwind. I think 150 is possible on the right airframe with the right prop.
Just remembered some of Combat Pigs videos.
mini magnum.mpg (1 min 2 sec)
They were getting up pretty quick into the mid 100 mph zone.
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Old Oct 03, 2014, 07:25 PM
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Originally Posted by Amp Abuser View Post
Yes agreed, I would much rather had that prop as a 6x5 for the AP 09 so was wondering if they may still be around. I ended up sourcing a German thin blade Multiplex 6 x 5.5 and a APC Pylon 6.5 x 5 to try.

The Kelly 6x3 may go on the QB .074.
I use a Master Airscrew 7x4 on my Hornet 09 and it works great.
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