Hi Tomi
Not sure how you scale your engine with rest of the U-boat, but here how I did it
The U-Boat ribbings through the engine room are space 600 mm. I have set up my U-boat drawing to be 100% correct for all the ribbings and frames base on real German U-Boat measurements (You got to love 1/1000 of an mm drawing precision software
). All my measurements for my drawings are base on the ribbings and frames! I needed a way to scale the engine with the ribbings and frames. This morning I found a way to do this.
I found on the Engine plans two pipe outlets (Fig. 1) and I found these pipes outlets on a U-boat plan (Fig. 2). All I had to do was match the width of these pipes outlets with the Lightening holes between the ribbings.
Simon
Fig 1
Fig 2