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General control line discussion => Open Forum => Topic started by: Gary Dowler on July 09, 2018, 11:46:58 PM

Title: Pretty amazing engine
Post by: Gary Dowler on July 09, 2018, 11:46:58 PM

And then this, form the "it had the virtue of never having been tried" file........

https://www.youtube.com/watch?v=OCexBDJOl58

Title: Re: Pretty amazing engine
Post by: Gary Dowler on July 10, 2018, 09:46:46 AM

Quote from: Motorman on July 10, 2018, 07:48:13 AM

Being turned with electric motor from behind. He has another video of a two cylinder Cox that sounds like only one is running.

I don't know. The sound seems odd but the engine is behind plexiglass.

Title: Re: Pretty amazing engine
Post by: Scott Richlen on July 10, 2018, 04:48:11 PM

Do not show this to Young Daniel!!!

Title: Re: Pretty amazing engine
Post by: Ian MacNeil on July 10, 2018, 05:27:16 PM

Where's the castor trail in the exhaust?
Oh, no exhaust.

Title: Re: Pretty amazing engine
Post by: Dan McEntee on July 10, 2018, 08:07:14 PM

Quote from: Motorman on July 10, 2018, 07:00:48 PM

That plexiglass would be covered in exhaust oil.

    The prop is in front, blowing back against the engine and cylinders. So the exhaust is going the other way. I wish the video had shown it winding down and stopping. That would tell you something.
  Type at you later,
  Dan McEntee

Title: Re: Pretty amazing engine
Post by: Mark Mc on July 10, 2018, 11:05:40 PM

Sorry, 45 years of running Cox engines makes me "Bull!"  Eight cox engines, even four or three would be very loud.  I've done three.  And no matter where the prop is blowing, the cylinders, especially the lower ones, would be covered in oil after a few seconds.  I'm not buying it.  The only noise I am hearing is the gear mesh.

Mark

Title: Similar principle, better execution!
Post by: Robert Zambelli on July 14, 2018, 04:57:53 PM

I found this G-Mark 30 around 20 years ago at a swap meet.
It's made up of 5 G-Mark .060 engines, each with a spur gear driving a larger gear on the output shaft - ratio is around 2:1.
A single small 060 size carb feeds the engines.
The firing order is 1-2-3-4-5 and can be set differently but as built, one engine fires at a time.
It also has a supercharger.
The exhaust feeds directly into the gearbox for lubrication.
The arrow indicates the exhaust port from the gearbox.
It's incredibly smooth and quiet.