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Re: NNG: Scenes at Steamtown

June 05, 2019 01:24PM avatar
Officially that form of Walscheart Valve gear is called "Indirect Motion". It is "indirect" because in motion the eccentric rod from the eccentric crank to reversing link is moving in the opposite direction of the valve stem. You see this set up on lots of locomotives with Walscheart Valve gear and slide valves, like #26. In this set up, the radius rod is in the upper portion of the link in forward motion. You will also see it on switch engines.

The normal way is to have the radius rod in the lower portion of the link when in forward motion. This is preferred on road engines. If the Johnson Bar linkage should fail at speed, the radius rod will drop to the bottom of the link. With Direct motion gear, it simply falls to full stroke. With Indirect motion, the engine will drop into reverse! Switch engines were constantly going forward and backwards, so it made little difference.
Subject Author Posted

NNG: Scenes at Steamtown Attachments

Mike June 03, 2019 09:19PM

Re: NNG: Scenes at Steamtown Attachments

Mike June 03, 2019 09:22PM

Re: NNG: Scenes at Steamtown Attachments

Mike June 03, 2019 09:28PM

Re: NNG: Scenes at Steamtown Attachments

Mike June 03, 2019 09:32PM

Re: NNG: Scenes at Steamtown

gato June 04, 2019 07:59AM

Re: NNG: Scenes at Steamtown

Greg Scholl June 04, 2019 09:09AM

Re: NNG: Scenes at Steamtown

Mike June 04, 2019 10:20AM

Re: NNG: Scenes at Steamtown

Earl June 05, 2019 01:24PM

Re: NNG: Scenes at Steamtown

Mike June 05, 2019 05:07PM

Re: Walschearts Gear with Slide vs Piston Valves . . .

Russo Loco June 05, 2019 09:00PM

Re: NNG: Scenes at Steamtown

wchamp2 June 04, 2019 06:40AM

Re: NNG: Scenes at Steamtown

Jim McKee June 05, 2019 02:31PM

Re: NNG: Scenes at Steamtown Attachments

MD Ramsey June 05, 2019 03:14PM

Re: NNG: Scenes at Steamtown

Mike June 05, 2019 05:16PM

Re: NNG: Scenes at Steamtown

Volvoguy87 June 11, 2019 06:27AM



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