Page 45 – A Proposal
Jim
Symanski’s engine is pretty impressive.
2.5
hp from twin gamma displacers linked to a double acting piston.
Pressurised to 10 bar
Interior
finned displacer cylinders of 4” diameter.
Have
a look at Jim Dandy No 6.
It’s
actually the same design idea as Robert and James Stirling of
1843. The Dundee engine.
This
is the design that I am embarking upon.
But
you have been basing the last 43 pages around the beta engine
Andrew?
Yes,
it is the design that the UK group have had the most success with.
But no-one has
reached
1hp let alone 2.5hp.
But,
for me, major reasons are:-
There
is no crankcase. The pressure is held within the displacer and
piston chambers by
sliding
rod seals. Pressurising a crank case in a private workshop to 10
bar is going to need an awful lot of bolts (and helium leaks from
the wall plates) or you have to cut from solid.
The
beta is an “integrated” design. The piston and
displacer have to be the same diameter.
Tuning
the piston stroke to match the expansion capability of the hot gas
is not an option.
When
the piston cylinder is separated from the displacer chambers it is
possible to adjust the
piston
stroke to match the heat and expansion capabilities of the
displacer chambers.
My
plan is to motorise the displacer rocker – like a Martini
engine. Full speed control.
A
working model has been built. Full size 3d plastic printing
prototyping has been used.
There
are no heater tubes, or cooler tubes.
So,
give me a few years, (2020 onwards) and see what results!
