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Post  twitch Tue Nov 12, 2013 9:35 pm

Anyone ever see one of these fly (or maybe flown one yourself)?  Seems like a pretty crazy setup - you hold a squeeze bulb on the control handle that supplies pneumatic pressure through a long tube to a bellows at the engine, which then swivels baffles in the exhaust and the air intake to control engine speed.  I can't imagine trying to somehow work this effectively while flying ... and that rig!  A flex-tube somehow sent down along the whole length of the control line?  Good luck with that!!! I don't know, maybe I'm wrong and it all worked great - at least must have worked well enough for Jim Walker to mass produce?

I love these kinds of things - pretty interesting in any case.  Unfortunately the squeeze bulb rubber has dried out and the bellows top is gone, but otherwise it is complete and in great shape!

I'd like to hear any other history on this engine if you know it. Thanks in advance!


Jim Walker Firecracker IMG_8792_zps9dbcfef8

Jim Walker Firecracker IMG_8793_zps0f9b1147

Jim Walker Firecracker IMG_8794_zps5db9a42b
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Post  pkrankow Tue Nov 12, 2013 10:20 pm

The linkage with the exhaust restricter flap and intake choke is pretty standard for throttle control (for the period), but the air actuator is something I've never seen before.

Pretty neat. (I wouldn't really want to try it though)
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Post  ekitten2 Tue Nov 19, 2013 2:51 am

one would think that the drag caused by a thick tube would be off putting ...not to Mencken the tube streaching would decrease the efficiency of the operation...(just my two bob's worth)
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Post  getback Tue Feb 28, 2017 6:54 pm

about the clamp on the back of the engine!! sme text from 2013 . This Site Rocks!
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