Cox Radial
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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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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.
I'm hoping he'll take it apart and post some detailed pics of the inner goodies.
#7
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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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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 [email protected] 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.
E-mail me at [email protected] 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.
#11
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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.
#13
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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
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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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....
If you get a chance to photo the insides I'd love to see it as well. No rush though....
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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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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!
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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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.
#23
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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!
"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!
#25
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RE: Cox Radial
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
So how does Ralf keep up crankcase pressure? Isn't that one of the great difficulties of 2-stroke radials? Great stuff.
George
That must be what the blower is for...