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Hot Air Engines

1/3 Scale Robinson Hot Air Engine


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  #1  
Old 12-04-2011, 08:15:22 AM
deverett deverett is offline
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Default 1/3 Scale Robinson Hot Air Engine

I have recently started building a 1/3rd scale of a No.4 Robinson Patent Hot Air engine; castings from Polly Models in England
http://www.pollymodelengineering.co....ines/index.asp
It is not a true scale model, but I am hoping to put a few touches to it to make it a bit closer to the real thing. To give you an idea of size, the platform will be about 8" long.
I'll just put up a few machining pics so you can get an idea of how I progress.

The stand was cleaned up top and bottom and then the cut outs for the legs were done with a hacksaw and abrafile.

Next job was to clean up the legs and this was done with an endmill and round noser in the corners.


Dave
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Old 12-04-2011, 10:59:11 AM
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Owen Bosma Owen Bosma is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Hi ............ I build a Robinson engine several years ago from scratch and not to any scale. I liked the layout and the use of a half walking beam. The engine is a nice runner.
The first picture shows it on its test stand, after that i build a wood stove. The open water cooler keeps it running nicely for several hours.

Owen ........... http://home.cogeco.ca/~obosma
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Old 12-04-2011, 06:20:31 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Interesting engine you have there, Owen.

I have heard that one of the problems with the Robinson type of engine is that they are prone to overheating quite quickly.

Dave
The Emerald Isle

---------- Post added at 10:20 PM ---------- Previous post was at 10:13 PM ----------

Next part to be machined is the platform. The casting for the platform has a laser cut steel sheet to close off the chamber which is held in place by 7 small screws.





Dave
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Old 12-06-2011, 03:50:12 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

This is how the underside of the platform looks with the steel sheet screwed to the casting.



Next job was to machine the displacer cylinder. This went well but there are a few blowholes in the casting, on the outside and in the bore.





I will fill these with a mixture of JB Weld and cast iron dust. I don't consider it necessary to return the casting for a replacement for these small blemishes.

I rested the displacer cylinder in the platform to make sure that the top of the cylinder touches the underside of the platform. It does!



Next, the two need to be screwed together, screws going through the top of the platform into the top of the cylinder.

Dave
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Old 12-06-2011, 04:04:06 PM
Culy Culy is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Keep up the good work Dave and keep the pictures coming. I really enjoy watching builds step by step. Looking forward to seeing the completed model.
Brian
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Old 12-11-2011, 03:27:10 AM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Now to finish off the platform by drilling the transfer passage.

Careful alignment is required for the hole as there is not much spare metal.





Dead centre! The hole is 7/32" diameter and just short of 3" long.

Now to join the displacer to the stand.



The two parts were held together with clamps and the holes were drilled through both parts.

Dave
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Old 12-12-2011, 07:51:20 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

A bit more progress. The stand, displacer cylinder and platform are now joined together. It is starting to be recognisable as a Robinson engine now.



I will tackle the displacer next.

Dave
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Old 12-14-2011, 09:27:35 PM
lazylathe lazylathe is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

Excellent work so far Dave!

This is going to be an interesting build to follow!
Keep the pictures coming!

Andrew
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Old 12-15-2011, 06:29:32 PM
deverett deverett is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

The displacer piston is supplied as a brass spinning with wall thickness of about 1/16”. A piece of brass plate is supplied to silver solde to the top as a cover for the piston but the drawings show a fabricated plug.

I chose to go with the drawing version and machined up a top for the piston from some brass bar I had after reducing the wall thickness of the spinning to about 20 thou, leaving just a small area below the top ridge at the full thickness. This to reduce the weight and also to try and reduce the heat transfer through the brass.



The two parts will be joined together by JB Weld after I have made up the displacer rod.

Dave
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Old 12-18-2011, 04:36:40 AM
benz1890 benz1890 is offline
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Default Re: 1/3 scale Robinson Hot Air Engine

My Robinson has a match stick where the snifter valve should be! Do you have drawings for the snifter valve?
Mike.
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