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Hot Air Engines

1/3 Scale Robinson Hot Air Engine


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  #11  
Old 12-18-2011, 06:31:08 AM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Mike

Is your engine a model or full size? Also, do you have a power takeoff pulley on the flywheel? If so, any chance you would let me have a picture of it and tell me how it is secured to the crankshaft. Thanks in anticipation.

Here are a couple of scans of the Alyn Foundry 1/2 scale drawings of the governor. Thanks to Orrin for these. Speaking to Graham Corry of Alyn foundry, he says that in model size they don't make any difference and are just another source of potential air leaks. In full size, the disc has 2 x 1/4" holes in it, diametrically opposed.





Dave
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  #12  
Old 12-28-2011, 05:54:01 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Work on the Robinson progresses somewhat slowly. The power cylinder casting needed a fair bit of work on it because the outside was oval. I cleaned it up on the linisher as far as I could. Before boring, the outside was turned as far as the link anchor.



Before honing the cylinder, I will use a mandrel to mount it on the dividing head to clean up the outside.

The model design uses a flat plate where the governor should be. I chose to make up a governor as per the diagram in my previous post, although I do not anticipate that it will make work in this size engine.




Dave
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  #13  
Old 01-06-2012, 09:30:04 AM
stirlingmaier stirlingmaier is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Quote:
Originally Posted by benz1890 View Post
My Robinson has a match stick where the snifter valve should be! Do you have drawings for the snifter valve?
Mike.
I have a set of full-size original drawings of all Robinson hot-air engines and could send you a scan showing this detail if you contact me directly via email
Regards
Gerd
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  #14  
Old 01-15-2012, 01:37:53 PM
benz1890 benz1890 is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Hi Dave and Gerd,
Thanks for the info and possible copy of the drawings.
My engine is a well made full size copy made in 1985 possibly by Ed Bolton. There isn't any pulley fitted but I need to make one.
Mike.
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  #15  
Old 01-15-2012, 03:42:43 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Mike

If you look at the thread 'More help for #5 Robinson' towards the bottom of page 1, and go to Dave Allen's reply, you will see thumbnails of drawings. If he is able to scan the drawings, maybe he could get a better scan of the pulley - for both of us!

I tried contacting him, but never got a reply. See if you have more success.

Dave
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  #16  
Old 01-26-2012, 03:39:20 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

The outside of the cylinder has now been cleaned up as well as can be done. To get a decent surface for painting, I will fill in the hollows with JB Weld. The piston has been lapped into the cylinder and is a good fit.

The crank disc on the model is just a 1-3/8" slice of steel. However, the full size is a casting with the counterweight incorporated, so I have tried to copy it. The crankpin boss was silver soldered in place.

Dave
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  #17  
Old 04-03-2012, 06:07:10 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

It is ages since I updated my progress on this little engine due to various reasons for absence from my workshop.

A few small bits have been done, but the latest setback is that when I started to machine the flywheel, a serious flaw came to light which ran from the side up to the face of the rim. Even machining way under the correct diameter could not get rid of it, so the casting has been returned and I am waiting for a replacement from the supplier. Unlike the other flawed castings, the flywheel rim will not be painted so the defect cannot be hidden.

The castings were not as good as I originally thought. The metal may have been OK to machine (no hard spots), but the outside of the cylinder and bearing block were oval instead of round. I have been doctoring them to make them presentable. You'll see the results later.

Dave
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  #18  
Old 04-09-2012, 06:30:50 AM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

The crankshaft bearing has been machined. I had a couple of miniature roller bearings and these were incorporated instead of the original brass bushings. Anything to reduce friction in these low power models.

The casting was oval, so a bit of car body filler was applied and rubbed down to get a cylindrical shape using the two buttons inserted in the bore to guide the file and emery cloth. One roller bearing is also seen. It is shown here after being painted with etching primer and red oxide primer as a second coat. The ends of rubber ear plugs were cut off and used as masking bungs in the ends.



The crank disc was painted before pressing it onto the crankshaft. Now waiting for the replacement flywheel casting.



Dave
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Old 08-11-2018, 04:31:14 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Well, it's only taken 6-1/2 years to get this model Robinson Patent hot air engine finished.
Tested it yesterday and am quite pleased with the way it runs. It is now bolted to a base and now doesn't bounce around.



Dave
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  #20  
Old 08-11-2018, 06:41:25 PM
Brent Rowell Brent Rowell is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Not sure why, but the video won't play.
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