Propping a Cox

daddyo Sun May 24, 2020 2:32 am

Here’s a thread devoted to those who have spent uncounted minutes trying to start one of these tiny motors. Post your ridiculously long videos of you trying to start these little demons, and maybe with some feedback from others you will have better success the next time around. Criticism is required!

Starting it off is my latest attempt, at zero to 9 1/2 minutes to ignition:
https://youtu.be/0WppKPkaqok

Surfer_kris Sun May 24, 2020 4:15 am

Wow, that was a long video...

A few tricks to try next time:
- prime the side of the piston with the cylinder port closed (this prevents overpriming of the engine)
- the spring starter should only be rewound about 1/2 turn. This stops you from going through TDC and firing off the priming prematurely. Plus it also saves the starter spring from deforming and hitting the prop once the engine is running.

Once you get a hang of it, it really shouldn't be any problem at all to start an engine. Smile

getback Sun May 24, 2020 7:07 am

I thought this was going to bee about the right prop for the right plane or something BUT i will play along >> I had never ran this engine and was beeing a pain holding the camera too OK .049A << Then the Cox Monster the end .. On you engine i would rebuild it and check /replace the gaskets /venture O-ring and possibly a new glow , after it started and removed the igniter RPMs went down and had erratic run also . Memorial Day

balogh Sun May 24, 2020 9:45 am

Eric, I could doctor the erratic run of my old red postage backplate reedies by replacing the hardened spraybar seal with a new one bought from Bernie, and adding a tight silicon tube and washer to the NV..since then these engines run like Schaffhausen clockwork Very Happy

Refer to the amok run my Quickie100 performed on my video with such a red postage bacplate beast in its nose.. Flying

daddyo Mon May 25, 2020 12:30 am

On your first video getback I can't believe you didn't try re-priming or clearing as well as hand propped that motor up. I've a bit to learn. Thanks for the tips Kris.

The fuel I used was about 15 years old, maybe it's time I got myself a new bottle.

getback Mon May 25, 2020 7:22 am

Like i said i had never ran this engine , I picked it from a pile . It was only for an experiment with the mount that Jason had 3D printed ... I know it needs work and Thanks for the advice , right now its still apart on the bench were i took the mount off because of a break from tring to change the glow plug out . Yes the seal at the needle needs replacing , i have those . I got the engine flooded and its a real PIA to try and work with it with one hand and video too . So that's my excuse and i am sticking to it lol!

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