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View Full Version : For Norman - and anyone else who knows what a 741 is



P.I. Stazzer-Newt
02-05-2017, 05:34 AM
http://www.douglas-self.com/ampins/projects/mrp1.htm

If you hit the "Home" button at the bottom of the page - there is a veritable goldmine to be explored - including such gems as the three cylinder five stroke diesel powered by coal dust!

Donn
02-05-2017, 05:48 AM
Imagine my profound disappointment when I clicked on "Home," anticipating said "goldmine," and found instead


Not Found

The requested URL /ampins/projects/index.htm was not found on this server.

willmarsh3
02-05-2017, 06:37 AM
Try this link

http://www.douglas-self.com/

There's lots of interesting and esoteric stuff here.

Donn
02-05-2017, 06:44 AM
Yes...I was able to back-click through the original link and find that page. Since then I've been on the "Unusual Traction Engines" section, drooling over beasties like this:

http://www.douglas-self.com/MUSEUM/TRANSPORT/traction/4wheelB1a.jpg

P.I. Stazzer-Newt
02-05-2017, 07:25 AM
Imagine my profound disappointment when I clicked on "Home," anticipating said "goldmine," and found instead

Quite right - that link is broken - however I see you have found something of interest.

Enjoy.

Norman Bernstein
02-05-2017, 08:32 AM
Interesting link... and yes, I know what a 741 is, used many of them.... not since the mid-70's.

This guy Doug Self seems to have been quite prolific.... and his book on audio amp design looks interesting.... but at over $60 on Amazon, not THAT interesting :)

bob winter
02-05-2017, 12:21 PM
Mr Self seems to have quite a range of interests.

ahp
02-05-2017, 07:39 PM
I thought it was a 747 prototype.

willmarsh3
02-05-2017, 11:15 PM
I found the "Malone liquid engine" interesting. It relies on the expansion of superheated water (without it ever turning to steam) to convert thermal energy into rotary motion.

http://www.douglas-self.com/MUSEUM/POWER/maloneliquid/maloneliquid.htm

But it involves pressures to 14000 psi so I can see why it never really took off.

He also mentioned "solid expansion engines". The Clock of the Long Now uses this in the form of rods that expand in the sunlight and pull on a ratchet wheel. This is pictured near the bottom of the link.

http://forum.woodenboat.com/showthread.php?219187-For-Norman-and-anyone-else-who-knows-what-a-741-is