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robot797's

"cox 049 gasoline"

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Post  Jason_WI on Wed Apr 03, 2019 12:27 am

Here’s a video of the new venturi backplate running.

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Post  Marleysky on Wed Apr 03, 2019 5:58 am

Sounds like sweet  music to my ears!  Man, a 6 minute plus Run! I’d be dizzy till Friday if on controlline, or chasing the plane over thru the next county if FreeFlight.
Super Backplate! cheers
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Post  balogh on Wed Apr 03, 2019 6:07 am

Great run with rpm-s above 16k


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Post  aspeed on Wed Apr 03, 2019 8:01 am

Nice steady run. Didn't miss a beat or lean out at the end.
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Post  getback on Wed Apr 03, 2019 9:54 am

Sounds Great !! That should have got the engine temperature up to test spec's . Is that the G-Mark 30 carb. on there ?
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Post  Jason_WI on Wed Apr 03, 2019 10:23 am

No it’s just the TD .020 venturi and NVA. The crankcase to crankshaft fit is loose on this engine. it’s a nose bleeder. Might be a source of the air leak and varying RPM throught the run. This was the second run in the video. I added fuel tubing to the needle valve to act as a seal since the first run varied in RPM also. As you can see it didn’t help.
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Post  Jason_WI on Fri Apr 05, 2019 1:55 am

Here’s the same short block but on a freshly printed horseshoe backplate and fine thread NVA.

Same surging with this backplate. Runs better at 3 minutes in. Wonder if it’s because the exhaust port opening faces the prop on this engine?

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Post  Jason_WI on Sat Apr 06, 2019 12:52 am

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Post  NEW222 on Sat Apr 06, 2019 1:57 am

Looks great Jason. Bringing life back to some engines that otherwise would not have one. It is times like this that I wish I had a 3D printer as well as the knowledge to design a backplate for my crankcase and p/c. While here, is the lower row furthest left the newest one using the new nozzle? Just curious as it 'appears' to be a bit smoother than the rest (not that it really matters, just curious)? One day I may take a look at one, but as you made mention before, a decent one is fairly more than I would be allowed by the missus.....
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