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Thread: Cox Radial


  1. #1

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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.

  2. #2

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    RE: Cox Radial

    How many Pots? Can we see it?

  3. #3
    combatpigg's Avatar
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    RE: Cox Radial

    This is like tuning into a beauty pageant on the radio!
    WHO GUNNA FEED MAW KEEEIDS..???

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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.
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    \"He who dies with the most good Cox engines wins!\"

  5. #5
    combatpigg's Avatar
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    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.
    WHO GUNNA FEED MAW KEEEIDS..???

  6. #6
    Bipe Flyer's Avatar
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    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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    1/2A all the way!
    Club Saito #151

  7. #7
    combatpigg's Avatar
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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.
    WHO GUNNA FEED MAW KEEEIDS..???

  8. #8
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    RE: Cox Radial

    I would like to see the innards too.
    A guy who used to live on this site and now is rarely here due to the "upgrade".
    Most likely fading away till the My Forums is fixed. Too bad.

  9. #9
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    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.
    Like classic video games and pinball, check out www.retrogamingroundup.com

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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 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.

  11. #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.
    Like classic video games and pinball, check out www.retrogamingroundup.com

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    RE: Cox Radial

    Got another couple of pics from Ralph.
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    \"He who dies with the most good Cox engines wins!\"

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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

  14. #14
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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....
    Witty saying to be plagarized shortly.....

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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
    Wires, Fabric, and round engines. The only way to fly!

  16. #16
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    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...
    "Perfection is achieved, not when there is nothing more to add, but when there is nothing more to take away."

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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!
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    \"He who dies with the most good Cox engines wins!\"

  18. #18
    combatpigg's Avatar
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    RE: Cox Radial

    That plane is AWESOME! I think he has stretched the meaning of 1/2A as far as it can go?
    WHO GUNNA FEED MAW KEEEIDS..???

  19. #19

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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.
    \"He who dies with the most good Cox engines wins!\"

  20. #20
    Silvaire's Avatar
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    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
    "Perfection is achieved, not when there is nothing more to add, but when there is nothing more to take away."

  21. #21
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    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

  22. #22
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    RE: Cox Radial

    Beautiful engine, I'd like to get my hands on one of 'em or maybe a couple. You never know...
    My grandfather always said that living is like licking honey off a thorn. - Louis Adamic

  23. #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!
    Roll Tide! FINAL:
    Alabama beats Texas 37-21 for 2010 BCS national championship! Go Bama!
    Alabama number one!!!

  24. #24

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    RE: Cox Radial

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

    Scott

  25. #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
    "... 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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