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mecrr
Engine Wiper



Posted - 09/15/2020 :  5:23:57 PM  Show Profile  Reply with Quote
Below are three photos of a smoke jack on my my Model Masterpieces Round house. I am trying to determine if the slanted cover should point toward the back or toward the center cupola. Second photo shows pointing towards cupola and third toward the back. Any suggestions as pictures of this appear to be rare
David
PS, yah, I know the fan needs to be weathered








A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475

TRAINS1941
Engineer

Premium Member


Posted - 09/15/2020 :  5:34:48 PM  Show Profile  Reply with Quote
Just a guess I would think the bigger opening would be facing the back of the RH.
To avoid the smoke from going down the front and into the door openings.


Jerry

"And in the end, itís not the years in your life that count. It's the life in your years." A. Lincoln

Country: USA | Posts: 12865 Go to Top of Page

mecrr
Engine Wiper



Posted - 09/15/2020 :  6:34:37 PM  Show Profile  Reply with Quote
Jerry, makes sense, that was my thought. So what about the smoke jack on the front section?
David


A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475 Go to Top of Page

desertdrover
Engineer



Posted - 09/15/2020 :  8:40:59 PM  Show Profile  Reply with Quote
This is a picture from the Model Masterpieces Round house instruction sheet. Not the greatest picture in the world, but it appears that the larger opening is toward the rear of the roundhouse. I would assume the same is for the front stacks. Small opening faces the front to give a draft pushing the smoke out the larger opening facing the rear of the structure.




Louis
Pacific Northwest Logging in the East Coast
Post count: 5000 posts added to below count.

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spyder62
Crew Chief



Posted - 09/15/2020 :  9:10:32 PM  Show Profile  Visit spyder62's Homepage  Reply with Quote
A stack of that design would be set with the low side set facing the direction the wind would normally come from. So wind blowing over the top would have a low pressure on the high side and draw the smoke out. If the other way the lip would catch the wind and force the smoke back down the stack.
rich


In my many years I have come to a conclusion that one useless man is a shame,
two is a law firm and three or more is a congress.
--John Adams

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mecrr
Engine Wiper



Posted - 09/16/2020 :  11:28:28 AM  Show Profile  Reply with Quote
Louis, thanks for the photo, just what I needed
David


A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475 Go to Top of Page

mecrr
Engine Wiper



Posted - 09/16/2020 :  11:30:21 AM  Show Profile  Reply with Quote
Thank you Rich, that is the practicality that I needed
David


A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475 Go to Top of Page

BurleyJim
Fireman

Premium Member


Posted - 09/17/2020 :  09:33:02 AM  Show Profile  Reply with Quote
The large opening (if there was one) would probably be facing away from the prevailing winds at that location.

Jim



Take the red pill

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k9wrangler
Engineer



Posted - 09/18/2020 :  1:53:06 PM  Show Profile  Reply with Quote
Ditto Rich and Jim larger opening to the prevailing leeward side of the building.


Karl Scribner
Sunfield Twp. Michigan
H.M.F.I.C
Kentucky Southern Railway
The Spartan Line

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mecrr
Engine Wiper



Posted - 09/18/2020 :  2:13:12 PM  Show Profile  Reply with Quote
Fan is overhead, so always a downdraft!
David


A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475 Go to Top of Page

BurleyJim
Fireman

Premium Member


Posted - 09/18/2020 :  6:54:20 PM  Show Profile  Reply with Quote
Not if it's sucking in fresh air from the outside. An exhaust fan would defeat the purpose of the Smoke Jack.

Jim


Take the red pill

Edited by - BurleyJim on 09/18/2020 6:57:31 PM

Country: USA | Posts: 5829 Go to Top of Page

mecrr
Engine Wiper



Posted - 09/18/2020 :  9:19:01 PM  Show Profile  Reply with Quote
Jim it was a joke, sorry, I was referring to the overhead fan in my layout room. I left reality when I turned 75!
David


A Maine Expatriate living in the valley of Northern California - Modeling in HO.
David Stickney

Country: USA | Posts: 475 Go to Top of Page

BurleyJim
Fireman

Premium Member


Posted - 09/19/2020 :  07:45:21 AM  Show Profile  Reply with Quote
Gee David, I hope that doesn't really happen in a month from now.

Jim


Take the red pill

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