Search found 4 matches

by danalinscott
Fri Mar 29, 2019 5:56 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Square pistons/cylinders
Replies: 8
Views: 1502

Re: Square pistons/cylinders

I agree that trueing the radiused corners inside the "cylinders" is more difficult since they cannot simply be bored true. Reciprocating rather than rotating tools must be used. I am depending on the piston sheathing (graphite for the top third and Teflon for the bottom third) which can be easily ma...
by danalinscott
Thu Mar 28, 2019 1:18 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Square pistons/cylinders
Replies: 8
Views: 1502

Re: Square pistons/cylinders

I agree that square steel tube is never actually "square" but machining it to true dimensions is pretty simple. I have some experience with Stirling engines and prototype design and fabrication having owned a prototype fab shop for about a decade in my 30's. Only the interior of the "cylinder" will ...
by danalinscott
Wed Mar 27, 2019 2:44 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Square pistons/cylinders
Replies: 8
Views: 1502

Square pistons/cylinders

I am in the process of designing a 4 cylinder double acting radial stirling engine. To simplify fabrication I hope to use square structural steel tubing for the pistons and cylinders. The pistons will be sealed with teflon "overlays" on the four sides that contact the cylinder walls and the cylinder...
by danalinscott
Mon Nov 27, 2017 11:29 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: High powered Stirling going into production
Replies: 72
Views: 52287

Re: High powered Stirling going into production

I attended a 3 day technical training session for Inresols gensets in Gavle. I have seen them run on wood pellets, taken them apart,etc. The factory was in the process of scaling up for larger production levels. Currently they appear to only be selling to a limited clientele who need them to prototy...