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Cox Engine of The Month
October-2019
colibriguitars's

Dieselized .049 with no Teflon disk or o-rings.

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Push button stooge - Page 2 Empty Re: Push button stooge

Post  Slick049 on Thu Mar 07, 2019 3:03 am

So, lots of changes in the design.  I had gone through a couple or three iterations of the original set up and was never satisfied with the action of the attendant components.  Upgrading to the 12V battery sent me back to the drawing board.  No more bellcrank, for starters.  Focused on direct throw, if that makes sense, and how to make that work.  The short throw of the solenoid piston really limited my options.  Found some alum. channel that was practical and went from there.  Then had to deal with capturing/containing the solenoid piston.  Getting the geometry right, up/down, side/side, length and so on.  FINALLY came down to this:

Push button stooge - Page 2 Stooge18
 
Firstly, the remote receiver is contained in a handy dandy bullet tray.  Not sure if blow back fuel would corrupt it's electronics but settled on this box to protect it and the wiring connections.

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Soldered a washer to a piece of tubing that just fit over the rivet head "guide tube" to act as a stop for the solenoid piston.  Placement of the solenoid, relative to the launch channel was critical, as might be expected.  A very intolerant, close enough, fit with those components.  Made use of double backed tape for easier adjustments.

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Assorted contraptions, including springs and not, were tried in an attempt to "arm" the catch pin.  Ended up crafting a piece of wire that sticks out enough to grab and use to slide to piston/pin to and fro.  Seems to work the best.  So far.

Push button stooge - Page 2 Stooge22

Again, considering the blow back fuel, I figured it'd be best to protect the solenoid and contraption as much as possible.  Found a divider, in its protective bubble pack that fit like it was made for it.  Just enough to keep the bulk of contaminants from reaching the working parts and low enough to fit under the horizontal stab of any airplane I might need to launch.  A little trimming and fitting and VOILA!

Push button stooge - Page 2 Stooge23

Closing in on finishing a Brodak P-51. A couple more coats of dope, some Monokote, and I'll be ready to test out my stooge.
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Post  944_Jim on Thu Mar 07, 2019 8:22 am

I like that iteration! I was thinking of the same idea, and using the bullet connectors to connect.to the power panelnon my field box for more "oomph!"

My concern is the side load on the pin when the plane is pulling on it. The solenoid has to overcome this friction.

The action only needs to move the retaining ounce enough to allow the tail skid to pull clear. So I've been thinking of using a bellcrank to decrease throw, but increase the pin-pull of the solenoid. I'm thinking close to 2:1 gives twice as much pull for 1/2 as much throw.

Over on RCG or SH a guy used a door pull solenoid with sear-safety latches activated by the same receiver you used.

I will continue to watch in anticipation.

Thanks for the updates!

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Post  getback on Fri Mar 08, 2019 12:53 am

Thats looking good and so is your plane that looks kinda like a stuntman 23 , all but the wing area . This push button would work good for two wanting to fly some comat (fun) , the only drawback is the batt. i have a1 field bow but would need a smaller setup for another ,, i use 4" alum. spikes to hold mine (stooge) in place , drill 3 holes and push the stakes through to the ground . Hope you get to try it soon keep us updated . Very Happy This Site Rocks!
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