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Cox Engine of The Month
November-2022
cmulder's

"Throttle and muffler contraption"



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Miss America with throttle control

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Post  duaneh Mon Nov 21, 2022 9:43 pm

This Miss America stopped me in my tracks at the swap meet. The plane is a little "crispy", but - a throttle ring? On a Miss America? I never knew there was such a combination.
Miss America with throttle control 100_4013
Miss America with throttle control 100_4014
Miss America with throttle control 100_4017


I wondered if the throttle control was a later addition, but the hole through the fuse, with crimped brass eyelets, says "factory".

The lower cowl screw came out readily, for a closer look at the engine. There is a bit of line still attached to the ring.
Miss America with throttle control 100_4015

Interesting how Cox did the return spring.
Miss America with throttle control 100_4016

The engine is dirty, but appears undamaged. The ring is stuck, but the engine turns over. It is soaking in fuel right now, tomorrow I'll get it cleaned up.
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Post  getback Tue Nov 22, 2022 6:02 am

Nice find , they all had throttle control till the last edition with the upright engine .. yours looks like 1972-1975  >> Description:
2nd version, side mounted engine, bolt on landing gear with rubber tires, straight trim. The engine 190-7 was equipped with a spring loaded throttle ring.   http://www.mh-aerotools.de/airfoils/cox_frameset.htm
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Post  duaneh Tue Nov 22, 2022 11:38 pm

Wow, Eric I did not know that.

The engine cleaned up easily. Mostly it was just dirty from sitting around for years. I did slightly adjust the C-clip on the throttle ring so that the spring would go in the front hole, and the control line in the rear hole. It seemed like a better way to arrange things.


Miss America with throttle control 100_4018
Miss America with throttle control 100_4019
Miss America with throttle control 100_4020
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Post  getback Wed Nov 23, 2022 5:36 am

IDK about the spring thingy but it shows in the pic it goes in the other hole ,, i guess you will find out LOL Turkey Engine looks good ! Very Happy
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Post  MauricioB Wed Nov 23, 2022 9:10 am

Mechanically speaking I deduce the following:
Surely the throttle ring function works crossover for the following reason.
If it is connected as indicated by the line and the red arrows, when the engine warms up, the force of the spring and the force of the draft control may cause the seeger ring to expand and not tighten the speed regulator ring. The distance between A and B becomes larger, therefore it is possible that they do not move together, that is, the seeger (C) ring moves differently from the speed (D) control ring.
While if you connect it crossed, indicated by green lines and arrows, the distance between A and B is maintained, and it even tends to tighten the throttle control ring, which guarantees that even when there is temperature, the seeger ring and the ring of speed control, they will always move together, in unison, guaranteeing the correct throttle setting desired by the pilot. My humble opinion.

Miss America with throttle control 100_4010
Miss America with throttle control 100_4011
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Post  Mark Boesen Wed Nov 23, 2022 10:29 pm

Miss America with throttle control 2e3e_110
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Post  crankbndr Thu Nov 24, 2022 8:33 am

I think the spring throttle was kinda rare on Miss America and most came without it.



Miss America with throttle control Miss_a10
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Post  duaneh Thu Nov 24, 2022 8:41 am

Happy Thanksgiving, CEF’ers!!


Mauricio, I didn’t consider the effect of thermal expansion on the throttle function. Thanks for pointing that out. I agree that it will tend to loosen the fit, as will pulling the clip in the “opening” direction. Still, the fit of the clip to the ring is quite snug, and the return spring is light.

I re-assembled the plane, and tied a piece of Dacron line to the throttle. It works perfectly when not running, at least.

Throttle open.
Miss America with throttle control 100_4110


Throttle closed
Miss America with throttle control 100_4111
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Post  getback Thu Nov 24, 2022 11:21 am

that looks right now that i see it better , you see were the string has been ... is the spring thing hooked to the airplane ? I had one of those engine may still have it LOL and have a couple fuses of the plane but no wings if i rem. right . Turkey Thanksgiving Dinner Happy T-Day to you too
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