PDA

View Full Version : First Sterling engine...Grasshopper engine



zerodegreec
01-28-2011, 02:39 AM
Well I started it back in October. Took Elmer's great drawings and make a Solidworks model of each part and built the assembly. I have been working a couple nights a week (when I can) and am finally done... well almost, I have to fine tune the running and do some more material cleanup and polishing.
I am a true amateur. my only "training" was from high school over 15yrs ago. All of this has been done with my BF20 Mill. (No lathe yet)

http://www.youtube.com/watch?v=YSvGjtMJxIg

http://dl.dropbox.com/u/318853/IMG_2074.JPG
http://dl.dropbox.com/u/318853/IMG_2075.JPG
http://dl.dropbox.com/u/318853/IMG_2076.JPG

gambler
01-28-2011, 02:51 AM
wow, very nice.

dp
01-28-2011, 02:52 AM
Very nice - Is the base a hotplate that drives it?

Lots of asymmetric linkages - cool!

Black_Moons
01-28-2011, 04:16 AM
Love the choice of colors involved. Maybe you should clearcoat it after a little (More?) polishing :)

brian Rupnow
01-28-2011, 09:37 AM
Very nice work. We need a video of it running.---Brian

zerodegreec
01-28-2011, 10:02 AM
Very nice - Is the base a hotplate that drives it?

Lots of asymmetric linkages - cool!


The steam inlet and exhaust is on the side of the cylinder.

It is all 6061, Brass and Mild Steel (the counter balance, shaft and flywheel).

Thanks everyone... Video of it running hopefully tonight. :)

sid pileski
01-28-2011, 12:45 PM
I think you mean "steam" engine???
Whatever, it looks nice.

Sid

dalee100
01-28-2011, 12:51 PM
Hi,

Fantastic work!! I will look forward to seeing it run.

dalee

Ken_Shea
01-28-2011, 01:14 PM
Agreed, very nice, lots of things moving, that's always interesting.

dp
01-28-2011, 01:37 PM
I think you mean "steam" engine???
Whatever, it looks nice.

Sid

Stirling cycle engines don't care where the heat comes from, so steam is as good as anything. In fact a bank of steam-heated Stirling engines require but one boiler.

If steam drives a piston directly then it's not a Stirling cycle engine. Or it may be a steam engine designed by a fellow named Sterling :)

zerodegreec
01-28-2011, 02:51 PM
I stand corrected. It is actually a elmer engine.

dp
01-28-2011, 03:34 PM
Even more excellent, then. The plans are here: http://www.john-tom.com/ElmersEngines/37_grassHopper.pdf and your pictures are much better than in the pdf file. There's quite a few free plans, there, in fact.

http://www.john-tom.com/html/ElmersEngines.html

zerodegreec
01-28-2011, 03:52 PM
Elmers plans are all free. When he passed away his wife gave the plans to a friend with the explicit directions to ensure they will always be free for anyone wanting to build his engines.

Google search Elmer's Engine. Over 100 plans are available. All free.

If anyone is interested I would be willing to distribute my solidworks drawings of his engine.

gary350
01-28-2011, 04:50 PM
Your engine looks good. It should run on compressed air. How does it run? Do you have a video of it running? I like to here the engines run.

I have 2 of Elmers books. I built a couple of his engines. Most of my engines are my own design. Sterling, steam and jet engines.

zerodegreec
01-28-2011, 05:06 PM
I will try to get a video made today.

If you're ever interested in selling the elmer books, drop me a line. I have been looking for them for quite some time.

zerodegreec
01-29-2011, 01:27 AM
Here is a short video of the motor running....:p

http://www.youtube.com/watch?v=YSvGjtMJxIg

lazlo
01-29-2011, 11:25 AM
Even more excellent, then. The plans are here: http://www.john-tom.com/ElmersEngines/37_grassHopper.pdf

FYI Dennis, Elmer's book is still in Copyright, and that guy has the entire book scanned on his web page.

laddy
01-29-2011, 02:00 PM
Hey,
I have been working on that engine for about the same time. All parts are made and now fitting and remaking the parts I don't like. I got Elmer's book off the net for $39.oo brand new with jacket. I was tickled to death. Your engine looks Great and runs!!! That is always the kicker. Congrats! Fred

zerodegreec
01-29-2011, 03:23 PM
Thanks Fred. I would love to see your engine when you have it built. The valving was a bit fiddley. It was fun setting it up properly and getting the ecentric strap adjusted properly. Let me know if you have any issues


Where did you find the book? I was told its out of print

dp
01-29-2011, 03:40 PM
FYI Dennis, Elmer's book is still in Copyright, and that guy has the entire book scanned on his web page.

I thought they'd all been released into the public domain.

Edit:

The plans turn up all over the web, as it happens. Dave Hyland has original scans (not PDF) here:
http://www.davehylands.com/Misc/Elmers-Engines/

Tom Wade has the story of the disposition of the plans here:
http://tomwade.me/tw/machinist/elmer/

He also mentions the orginal book is worth a small fortune to some collectors.