Search found 17 matches

by tew
Wed Nov 01, 2017 11:34 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: 2 KWh LTD Stirling Engine
Replies: 28
Views: 22230

Re: 2 KWh LTD Stirling Engine

I have built a ltd solar engine with a 4 1/2 cu. inch displacer and a 2" dia. power piston. The best power I have attained so far is 1.7 volts pulling an old car fan motor. this is at 440 degrees f. hot and 180 degrees cold.
by tew
Tue Dec 22, 2015 12:26 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 17129

Re: generators

Ian that looks like it would do the job. Do you have any idea of the effeciency of it. Where would I get a brushless about 1/4 that size?
by tew
Mon Dec 21, 2015 5:54 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: oil
Replies: 7
Views: 4699

Re: oil

I was using singer sewing machine oil but switched to this. Its a lighter oil than Singer and seems slicker. I think its a synthetic. Doesn"t last forever.The inside of my power piston looks like a worn out washboard(exaggeration). Its an old pneumatic cylinder which you would think would be smoothe...
by tew
Sun Dec 20, 2015 1:41 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: oil
Replies: 7
Views: 4699

oil

Has anybody using oil in their engines tried Lucas gun oil? It doesn"t burn off like most oil.
by tew
Sun Dec 20, 2015 10:58 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 17129

Re: generators

thx. Ian. Are any of your generators brushless and do you get more output from a brushless?
by tew
Sat Dec 19, 2015 11:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 17129

generators

What would be the best generator for a heat engine that runs at about 300 rpms. It has a 2" power cylinder. I currently use an old 18 volt drill motor. The best I get is about 1.2 volts
by tew
Tue Nov 17, 2015 12:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: directional air flow
Replies: 5
Views: 5052

Re: directional air flow

Preliminary observation is that the directional air flow does work. Don't know yet if its better comparatively. I measured the temperatures of the piping going into the power piston from the hot end of the displacer and the temperature of the cold end of the displacer and the temperature at the powe...
by tew
Sat Aug 15, 2015 11:34 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: dwell on displacer
Replies: 16
Views: 11383

Re: dwell on displacer

Thx for the thread vamoose on variable phasing. My displacer crank can be adjusted by hand and like Ian I didn't see much dif. between 85 and 105 degrees. But that was static timing. I thought with the dwell a larger throw on the crank would be required but because it slings the displacer piston out...
by tew
Fri Aug 07, 2015 11:07 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: directional air flow
Replies: 5
Views: 5052

Re: directional air flow

Thanks for the reference Bumpkin. At least if it doesn't work I'm in good company.
by tew
Fri Aug 07, 2015 1:59 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: directional air flow
Replies: 5
Views: 5052

Re: directional air flow

Clarification... The top port will open at tdc of the power piston and the bottom port will open at bottom of stroke of the power piston since the displacer is 90 degrees ahead.
by tew
Thu Aug 06, 2015 9:52 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: directional air flow
Replies: 5
Views: 5052

directional air flow

I am working on a new displacer.What does the group think of directional air flow? My displacer is flanged in the middle to isolate hot end from cold end. I have a port in the middle of the top and the middle of the bottom. The displacer is ridged under the ports for a loose slip. The top port will ...
by tew
Tue Aug 04, 2015 10:05 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: dwell on displacer
Replies: 16
Views: 11383

Re: dwell on displacer

I probably should have said upfront that my engine runs at less than 300 rpm's. I wouldn't try slotting the yoke on anything running much faster. By the way I run my engine off a heat lamp.
by tew
Sat Aug 01, 2015 4:26 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: dwell on displacer
Replies: 16
Views: 11383

Re: dwell on displacer

Thx for the replies. I still haven't had time to look up a scotch yoke but I will. I merely slotted the yoke at the middle of the displacer shaft. Bad part is the noise but its interesting how the displacer is slung out and in really making the travel time on the displacer minimal. And minimal is go...
by tew
Fri Jul 31, 2015 10:36 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My 18cc Alpha Stirling Engine
Replies: 28
Views: 15082

Re: My 18cc Alpha Stirling Engine

Plani, really really nice engine. But I guess I don't understand your displacer cylinder. Looking at the cutout dwg. the piston appears to be very thin. I thought the displacer piston should be almost half the length of the displacer.