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  1. #1

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    Cox engines with throttle

    Any one remember the old Cox engines that came with a throttle? Weren't they for control line? I would like to build a control line plane for my grandson. I was thinking the only difference between C/L engine and RC is the throttle, Am I correct? I didn't fly many control line airplanes when I was young and don't know much about them, but I think I remember a C/L handle with the throttle control made on it.

  2. #2
    GallopingGhostler's Avatar
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    oldbassard, many RC planes use the non-throttled versions of the Cox engines, although some use the throttle versions. Nothing prevents RC versions from being used for CL. I remember a friend flying a throttle controlled Testor .049 P-26. The third string had a line with a ring for the index finger. It was spring loaded, tugging on it changed the throttle.

    I've never used an RC engine for CL, except for one which I wired to hold the throttle wide open. For RC, back in the 1980's I used a Cox .049 R/C Bee. It had an exhaust throttle muffler that worked very effectively on a Sterling Minnie Mambo single channel rudder plane with auxilliary sequential quick blip throttle (HI - MED - LO back to HI).

    IMO smaller CL models don't really lend themselves well to throttle control, being marginally powered to begin with if a reed valve .049 is used, and especially if there is any breeze present. For me, simplicity is better. Plus, when one lowers the throttle setting, it is easy to lose line tension. On the larger jobs, like the .35's on up carrier models, they have articulated line leadout guide and rudder, so that when the throttle is chopped they cant the aircraft outward to maintain line tension.

    Cox International http://coxengines.ca/ has both exhaust throttle rings for all Cox .049's and choke tube throttle for SureStart .049's, if one wants to experiment with throttle control. Given the low investment costs in 1/2-A CL, nothing prevents experimentation.
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    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  3. #3

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    You're correct, the throttle is operated by a third control line. The Roberts handles and bellcranks are available from Brodak. The throttle adds a new dimension to C/L . Its lots of fun doing " touch n goes " and low speed passes.
    Last edited by vauxhall; 11-08-2013 at 07:18 PM.

  4. #4
    GallopingGhostler's Avatar
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    I'm sure that's true, vauxhall. It's just for me that given our austere weather here in Clovis NM, which tends to be windy because of open farm land with few trees and no hills, the half-A's don't do too well. Otherwise I wouldn't mind experimenting, let alone fly them. To handle the winds I've got a Ringmaster S-1 with McCoy .35 I'm finishing up. It and the Ringmaster Jr. with OS Max .15-FP-S should keep up with the winds (unless really bad).
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  5. #5

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    Thats cool, I was just confirming the fact that there are throttled C/L models.
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