Search found 153 matches

by cbstirling2
Wed Mar 15, 2017 4:23 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: SURFACE AREA OPTIMISATION
Replies: 8
Views: 4586

Re: SURFACE AREA OPTIMISATION

I am also thinking that for the cold side, an aluminum conic head is preferable to steel to get the heat out quickly.
by cbstirling2
Wed Mar 15, 2017 4:16 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: SURFACE AREA OPTIMISATION
Replies: 8
Views: 4586

Re: SURFACE AREA OPTIMISATION

Vamoose and I had the same question: Does a Heylandt Crown belong on both hot and cold pistons in an alpha engine?? Graham Walker wrote "Heylandt Crown: The addition of an extension to a reciprocating piston to remove the hot or cold fluid from the region where the piston rings and seals operate." B...
by cbstirling2
Sat Mar 11, 2017 10:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Sieg hae01-1/Grizzly 8101 piston setup.
Replies: 2
Views: 2475

Re: Sieg hae01-1/Grizzly 8101 piston setup.

Please post a picture :)
by cbstirling2
Sat Mar 11, 2017 10:10 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 60
Views: 26052

Re: Heater & Regenerator Design

Looks cool! Excited to see it run. Please post a YouTube video. Is there enough distance for the displacer pushrod? Bumpkin, good question. Do people bring the crank back to center for uniformity or is it a balance concern? I think there is too much metal in that arm. I'd drill holes it in and remov...
by cbstirling2
Mon Mar 06, 2017 7:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: toy alpha engine
Replies: 17
Views: 7651

Re: toy alpha engine

A chart from Martini's NASA report Screenshot_2017-01-08-12-13-28.png CC Lloyd "A Low Temperature Differential Stirling Engine for Power Generation" https://ir.canterbury.ac.nz/bitstream/handle/10092/2916/thesis_fulltext.pdf;sequence=1 Martini, W. R. "Stirling engine design manual, 2nd edition" http...
by cbstirling2
Mon Mar 06, 2017 6:37 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: toy alpha engine
Replies: 17
Views: 7651

Re: toy alpha engine

Its interesting comparing the stats on the one pictured above (http://www.ebay.com/itm/New-Hot-Air-Stirling-Engine-Model-Motor-Power-Generator-Engine-Alpha-Engine-Toy-/302230808015) with another alpha from Japan (http://global.rakuten.com/en/store/overspec/item/kyg-se-905hp/) I think the one above m...
by cbstirling2
Sun Mar 05, 2017 2:21 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What a difference a flue makes! +75%
Replies: 15
Views: 7724

Re: What a difference a flue makes! +75%

Aviator and Ian,

So the flue improves the combustion and heat transfer. I wonder how much was the power improved due to increased fuel consumption and how much due to increased heat transfer?

Aviator, many thanks for introducing:
https://en.wikipedia.org/wiki/Reynolds_ ... Derivation
by cbstirling2
Sun Mar 05, 2017 7:11 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 14720

Re: generators

by cbstirling2
Sun Mar 05, 2017 4:55 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: toy alpha engine
Replies: 17
Views: 7651

Re: toy alpha engine

I just realized that have small diameter stainless tubes - metal chopsticks! They are slightly conical, so depending which chunk I use, I will have different diameters. Do you think that a tube lacks sufficient surface area? (Trev post suggests so. Wife will be happier as chopsticks won't be cut up....
by cbstirling2
Sun Mar 05, 2017 4:28 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 14720

Re: generators

According to the specs, the toy alpha spins at 1700 RPM. The drive pulley is at least twice the diameter of more as the generator. So the generator spins at least 3000 rpm. I also used an analog meter to double check the amp output and got the same value. Next time I will try different shunt resisto...
by cbstirling2
Sat Mar 04, 2017 6:03 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: toy alpha engine
Replies: 17
Views: 7651

Re: toy alpha engine

My brother and I experimented with two regenerators that I made. We had a thermocouple on the cold cylinder, and a voltage meter and amp meter period we used a thousand on resistor as a loan from the generator. First thing to mention it's very difficult to get only one variable change when testing b...
by cbstirling2
Sat Mar 04, 2017 4:24 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 14720

Re: generators

Trev, I tried that and it read infinite... i definitely need a load on the generator. Due to Ohm's law. From the internet: "Multimeters have an incredibly high input impedance. If you connect your meter directly to the output of your circuit and ground you will be loading your circuit with this high...
by cbstirling2
Fri Mar 03, 2017 7:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: generators
Replies: 32
Views: 14720

Re: generators

How do I measure the current output of a small dc generator (toy motor), do I just use 1000 ohm resistor in series with the mulitmeter as the load to measure the current?

How does the 1000 ohm resistor affect the reading?
by cbstirling2
Fri Mar 03, 2017 5:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: What a difference a flue makes! +75%
Replies: 15
Views: 7724

Re: What a difference a flue makes! +75%

Just got an email from the other guy. He corrected himself. It's an alpha.
by cbstirling2
Thu Mar 02, 2017 10:13 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What a difference a flue makes! +75%
Replies: 15
Views: 7724

Re: What a difference a regenerator makes! +100%

The second video shows the difference a regenerator makes. Doubled the power. In this, one can see the grooves inside the hot cylinder. image.jpg Notice there is insulation at the top of the cold cylinder to insulate the regenerator. image.jpg http://global.rakuten.com/en/store/overspec/item/kyg-se-...