"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Cox Radial

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Old 09-16-2005, 10:17 PM
  #1
R Barnette
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Default Cox Radial

I built this cox radial a while back, it runs and idles well. 9500rpm with a 9/4 prop, idle 2200 rpm, 270 gram`s weight, 4"OD over plugs, and it is not a geared radial.
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Old 09-16-2005, 10:21 PM
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Default RE: Cox Radial

How many Pots? Can we see it?
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Old 09-16-2005, 11:04 PM
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Default RE: Cox Radial

This is like tuning into a beauty pageant on the radio!
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Old 09-17-2005, 07:45 AM
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Default RE: Cox Radial

Here you go guys. Ralph lives in the area and sent me this picture a couple weeks ago. He had trouble posting the pic so I've posted it for him. I asked him for some details and here's what he sent. "The engine has a single throw crank and a master rod, it weighs much less than a G-Mark 30, 200 grams less , it also has a 1" dia blower on the back side for the fuel induction."

I'm hoping he'll take it apart and post some detailed pics of the inner goodies.
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Old 09-17-2005, 10:50 AM
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Default RE: Cox Radial

That's ingenious, but 200 grams less? That's almost 1/2 a pound. The G MARK 30 must have been quite a chunk.
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Old 09-17-2005, 02:23 PM
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Default RE: Cox Radial

Wow, that is very cool.[sm=cool.gif] More pics please.


CP,
Here's a picture of the G-Mark. It looks like it was indeed, quite a chunk.
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Old 09-17-2005, 03:07 PM
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Default RE: Cox Radial

Thanks for the look at the G MARK. Forgot about those steel liners and it was probably gear driven? A little extra steel here and there can quickly add up. If the weight difference was just about aluminum, then it would take quite a lot to equal 200 grams.
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Old 09-17-2005, 08:59 PM
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Default RE: Cox Radial

I would like to see the innards too.
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Old 09-18-2005, 12:07 AM
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Default RE: Cox Radial

I would love to see someone actually produce a KIT for these engines they are always posting pics of. Maybe a crankcase and rod, you get your own cyl, pistons, carb etc. and assemble it.
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Old 09-18-2005, 03:15 AM
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R Barnette
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Default RE: Cox Radial

If any one is interested in a small radial, or would like to see larger 3&5 cylinder engines up to 2ci so far.
E-mail me at ralphghm2000@cs.com or call 662-622-7136.
I hope to build about ten for my self this winter,The planes are already framed up and ready to fit the engines when they are built, Ford Trimotor, Royal B-17,engines will fit in side the cowl just fine
For some reason I am having problems posting pictures on this web site
Later
Ralph
Coldwater MS.
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Old 09-18-2005, 08:50 PM
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Default RE: Cox Radial

I tried to give you a ring earlier but didn't get an answer. I actually grew up just down the road from you in Oxford. Some of my friends grew up in Crockett and Como. I know that whole area very well. I love the idea of the engines and I would love to hear more about your plans. Do you know Dr Fox who runs the hobby shop in Oxford? He has some rare treasures in that shop, lots of rare kits. I always make it a point to stop by an see Doc whenever I am there.
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Old 09-19-2005, 09:12 AM
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Default RE: Cox Radial

Got another couple of pics from Ralph.
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Old 09-19-2005, 12:25 PM
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Default RE: Cox Radial

As far as the G Mark 30 radial, a few observations if you please.
It was beautifully made but weighed too much thats a given. Got a new one at the WRAMS show from AHC back in the 80's and mounted it to run. Made the appropriate plug harness and got everything ready to start. Took bets to see how many pulls it would take to start. It had a very strange feeleing as you pulled the prop through. Remember it is a geared motor and as such does not have a definite compression cycle. At any rate after the appropriate bets, cynicism, et al I primed it and believe it or not it went on the first flip. Has a sound like a wankel or a good sewing machine, take your pick. The throttle response was good too. Fuel was always 20% nitro/25% castor .
Now the bad part. It was mounted on a Kinner Sportster that was made especially light and just for this motor. Truth is the motor doesn'tt have the power to get out of it's own way. Went through a lot of different props, trying to improve the static thrust of the little critter but it never did manage to fly the plane with any sort of authority.
If you have one they are probably appreciating in value and thats all right, but don't be tempted to buy one and use it on a plane. You will be disappointed.
Dennis
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Old 09-19-2005, 12:44 PM
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Default RE: Cox Radial

Very nice work Ralph. And when you run out of model projects I see that you've got a few automotive items waiting for ya....

If you get a chance to photo the insides I'd love to see it as well. No rush though....
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Old 09-22-2005, 03:58 AM
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Default RE: Cox Radial

Ralph brought his engines to my Warbird fly-in a couple weeks ago and they are truly amazing! Especially the .049 radial. It runs very smooth and seems to have a lot of power. Just thought I'd let you guys know. Bill
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Old 10-28-2005, 07:40 PM
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Default RE: Cox Radial

I thought I would drag this up to the top, in hopes that it might jog DickyBird into getting together with Ralph and posting some more pix of this interesting engine...
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Old 01-05-2006, 08:44 PM
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Default RE: Cox Radial

I got an email yesterday from Ralph with these 2 pictures....looks like he's making progress. Man, what a project.[X(]

He said he's hoping to be finished in time for the Arkansas S.M.A.L.L. this June. I hope so!
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Old 01-05-2006, 09:03 PM
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Default RE: Cox Radial

That plane is AWESOME! I think he has stretched the meaning of 1/2A as far as it can go?
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Old 01-05-2006, 09:13 PM
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Default RE: Cox Radial

Yup, I saw one of his radials run over at the Tullahoma S.M.A.L.L. and it was very cool indeed. It idled down well and had good throttle response. 3 of them running at the same time oughta be a real mind-blower.
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Old 01-05-2006, 10:40 PM
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Default RE: Cox Radial

DB,

I am glad you are still in touch with Ralph.

I hope you can get him to send you some pictures of the INSIDE of one of his engines...

Arlen
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Old 01-05-2006, 10:56 PM
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Default RE: Cox Radial

So how does Ralf keep up crankcase pressure? Isn't that one of the great difficulties of 2-stroke radials? Great stuff.

George
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Old 01-06-2006, 12:04 AM
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Default RE: Cox Radial

Beautiful engine, I'd like to get my hands on one of 'em or maybe a couple. You never know...
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Old 01-06-2006, 01:21 AM
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Default RE: Cox Radial

Quote by subarubrat:
"I would love to see someone actually produce a KIT for these engines they are always posting pics of. Maybe a crankcase and rod, you get your own cyl, pistons, carb etc. and assemble it."

Ditto!
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Old 01-06-2006, 01:03 PM
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Default RE: Cox Radial

Those are gorgeous, and look to be turning some large lumber. Any more information would be greatly appreciated.

Scott
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Old 01-09-2006, 07:18 PM
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Default RE: Cox Radial

Quote:
ORIGINAL: SERCEFLYER

So how does Ralf keep up crankcase pressure? Isn't that one of the great difficulties of 2-stroke radials? Great stuff.

George
"... it also has a 1" dia blower on the back side for the fuel induction."


That must be what the blower is for...
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