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Topic: Original ELCO Records and Drawings |
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Andy Small
MASTER
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Posted on: Aug 13, 2016 - 5:30am
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It is a treasure, and nice to finally have a honey pot near where I live.
Another interesting rabbit hole. PT 731's Oct 1944 Mark 19 Mod 4 torpedo tube firing of the Mark 15 torpedo got me wondering. Doing a quick internet search, the Mod 4 was for the longer 21 25' torpedoes which corresponds to the Soviet 53-39 torpedo (295.3 long, weight 3,924 lbs, warhead 698 lbs) which had a top speed of 51 knots. Pretty vicious big torpedo. For a comparison, the Mark VIII was 256.3 long, 2600 lbs, warhead 466 lbs and speed 36 knots. Explains why they only had two tubes. Quite a sting!
- Andy
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Patrick Matthews
New Member
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Posted on: Aug 24, 2016 - 6:04pm
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Just found this... wow just wow!
I'd like to point out that it's preferable of course, but not necessary to scan such engineering drawings... good images can be obtained with a cell phone camera!
I was researching a line of old marine engines earlier this year, the Hicks engine famous for powering much of San Francisco's small fishing boats in the 1920's. Old blueprint work shop copies are all that's left of the the hundreds of drawings, and the SF Maritime museum needed $20 each to have them scanned. No way I was going to pop for that.
But could I just come in and take snap shots? Why sure! So I spent a day there and filled up my memory card with carefully shot images of the prints... an example below.
Note that with the dimensions on an engineering drawing, the part doesn't need to be scaled off the paper... the dimensions are right there! So the image can be cockeyed and stained, no matter.
Typical blueprint (stamped 1927):
My CAD model created from such prints:
Patrick Matthews
Matthews Model Marine
http://matthewsmodelmarine.wordpress.com/ |
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