Ahh, I see what you mean, Ed. Thanks.
Rich
Alton Junction
richhotrainBy the way, how do you know that the left and right sections are 60/40 and 40/60?
All I'm implying by that is that the joints of the side sections are offset.
4 panels + 3 on the right side (what I'm calling 60/40)
3 panels + 4 on the left side (what I'm calling 40/60) in order to off-set the joint.
W_prattruss by Edmund, on Flickr
Cheers, Ed
Frank, thanks for that reply. Very informative and much appreciated.
Check my PM that I just sent to you.
The center section is level and perpendicular to the bottom, actually the main stress point of the entire bridge. That is why it has an ''X'' brace in the center. The others also are flat on top, but not perpendicular to the bottom. That is a riveted bridge, all the girders are straight, but angled when constructed. A welded bridge will have some pre-stressed curved girders.
Ed Pullman is just about correct in His assessment.
Electrical/Machine/Structural Design Draftsman......before I got drafted in 66'....
Take Care!
Frank
gmpullman The instructions are here: https://www.walthers.com/143-single-track-railroad-arched-pratt-truss-bridge-kit Left and right sections are 60/40 and 40/60. I believe the center section is level. Walthers-archpratt by Edmund, on Flickr Cheers, Ed
The instructions are here:
https://www.walthers.com/143-single-track-railroad-arched-pratt-truss-bridge-kit
Left and right sections are 60/40 and 40/60. I believe the center section is level.
Walthers-archpratt by Edmund, on Flickr
By the way, how do you know that the left and right sections are 60/40 and 40/60?
BigDaddyEdit I misunderstood and thought Rich meant the piece connecting the left and right sections, but he means the the side piece over the X, which in the photo doesn't look flat.
BigDaddy j. c. is this what you are refering to http://bridgehunter.com/ky/mclean/bh47058/ Kit bashing a real bridge is beyond most of our budgets or expertise. I think he means this one. Edit I misunderstood and thought Rich meant the piece connecting the left and right sections, but he means the the side piece over the X, which in the photo doesn't look flat. I think that is an illusion of the photo. Foreshortening is the photographic word for it and is the result of a wide angle lens. The bridge is symmetrical but the impression is that everything to the right of that X in the bridge is longer. It wouldn't make any kind of sense to have a model that inaccurate that the segment would be curved or on an angle.
j. c. is this what you are refering to http://bridgehunter.com/ky/mclean/bh47058/
is this what you are refering to http://bridgehunter.com/ky/mclean/bh47058/
Kit bashing a real bridge is beyond most of our budgets or expertise. I think he means this one.
Edit I misunderstood and thought Rich meant the piece connecting the left and right sections, but he means the the side piece over the X, which in the photo doesn't look flat.
I think that is an illusion of the photo. Foreshortening is the photographic word for it and is the result of a wide angle lens. The bridge is symmetrical but the impression is that everything to the right of that X in the bridge is longer. It wouldn't make any kind of sense to have a model that inaccurate that the segment would be curved or on an angle.
was trying to find what truss he was refering to its called a Pennsylvania truss , there are several variations of the pratt truss .
Henry
COB Potomac & Northern
Shenandoah Valley
If anyone has the Walthers Cornerstone Arched Pratt Truss Bridge, eithter the single track or the double track version, can you tell me if the center segment is perfectly level flat on the top?
Being that it is an arched bridge, the remaining segments on either side slope a little, but is that center segment perfectly level on the top of the segment?
I ask because I am thinking about kitbashing this kit, so that middle segment needs to be level flat on top for the kitbash to work.
By the way, it will be either Item No. 933-4521 or Item No. 933-4522.
Thanks.