I'm guessing the lack of replies means no-one knows of the availability of drawings. Several models have obviously been completed over the years; what do builders do with drawings when they finish a model? Can drawings be onsold after use without offending copyright? I am still keen to obtain a set of drawings with the hope of being able to fabricate the unavailable castings. Here's hoping!!
I have run into this problem with several engines that I want to build.
My solution is to go find photos on the internet, study them closely, pick off the proportions between the various parts in CAD, and then build a 3D model.
From the 3D model, I can make 3D patterns, and then cast these old engines.
I don't copy the old designs such as the 1/2 scale Briesch Olds, but rather default back to original photos of the old Olds engines, and then start new drawings from scratch that are based on photos of old Olds engines.
Any copyright issues are avoided if one creates their own drawings from old photos.
I assume folks who have the old drawings are concerned about copyright issues.
Nobody would share their Briesch Olds drawings with me, and for whatever reasons that is no problem.
It makes no difference to me since I can make my own drawings and castings anyway.
The old 1/2 scale Briesch Olds design will die since there are no more castings, and nobody shares drawings.
A new 1/2 scale Olds design is being created, and I will make that design open-sourced to all, so that it will never go away.
The same can be done with the Root & Vandervoort, or many other engine designs.
I am recreating a Soule Speedy Twin, a Ball Hopper Monitor, a Galloway, a Frisco Standard, and several other engines, using old photos only.
I plan on posting open-source drawings for all of these engines.
All you need is a few good photos, and a backyard foundry.
These days, new engine builders are left with few choices except to start recreating the old designs from scratch.
It can be done; I have done it.
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