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No I have not seen the Senft book. Looks quite expensive at £75!
I have read Andy Ross's book and my design was based on Divid Kirk's engine.
I am still puzzled as to why the engine was more reluctant to run when pressurized.

Many thanks Staska.
That is very interesting. I was considering reducing the bore of the cold cylinder to about 55mm. This would give a ratio of 1.3:1 which might improve the power? Changing the separation angle to 125 deg. would mean a lot more work. What do you think?

just to clarify the regenerator filling, that is 90% working fluid (10% foil)

Working fluid air at +1 bar over atmospheric
Low tension piston rings parallel face
Regenerator 95mm OD, 68.5mm ID

Heater tubes 5mm ID 190mm long X 16
Cooler tubes 4.5mm 51mm long X 36
Regenerator 25mm long 94mm total volume 90% filled, 0.03mm thick s/s foil dimpled by 0.3mm

Many thanks Staska, Bore 63.5mm Stroke 45mm Swept volume about 200cc Dead volume about 220cc Compression ratio about 1.6:1 Hot side about 700 Deg C cold side about 20 Deg C Static torque required to turn crank 0.9Nm at stiffest point (this may be the problem?) Most of the basic dimensions can be see...

Well, finally got round to testing it at last and it did very nearly run un-assisted. I was spinning it it up with a drill on the crankshaft bolt and using plenty of heat, the tubes glowing red near the top. This was at atmospheric, the strange thing was that it seemed to be more reluctant to run on...

Hi all. Joined a few days ago and completed a couple of posts but only just seen this thread. I am a retired aeronautical engineer with some experience of building steam engines, recently a triple expansion engine of about 10 BHP but I am relatively new to sterling engines. Currently building one ba...

This drawing may be of interest

I am currently building a sterling engine based on a Clarke V twin compressor

Many thanks Tom, I will give it a try.
Tony

Hi, this is my first post, just joined yesterday. I am nearing completion of a sterling engine based on Clarke V twin compressor. I am considering using mild pressurization say around 1 bar to start with. I was thinking about using a separate air supply for the crankcase and running it at a slightly...