Same as for the Forell:
In case I feel the need to make GRP molds again, I guess it would be for HMS Holland.
Cheers Andreas
today's work
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That's because we had good spies who stole many ideas from the French, e.g. the two-hull design ;-)
And: There was a predecessor to the U1. The Krupp Forelle, an experimental midget submarine that was sold to Russia:
https://en.wikipedia.org/wiki/Russian_submarine_Forel
This looks like another possible submarine build to me!
Rob
"Firemen can stand the heat."Leave a comment:
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That's because we had good spies who stole many ideas from the French, e.g. the two-hull design ;-)
And: There was a predecessor to the U1. The Krupp Forelle, an experimental midget submarine that was sold to Russia:
Last edited by DrSchmidt; 01-23-2025, 09:48 AM.Leave a comment:
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Better too much ballast tank than too little!
Man! I'm starting to appreciate how, from the start, your navy got the submarine structure and systems right with the first combatant. You German's! We all advanced our own fleets on the back of yours. I hope acknowledgment of that fact is never lost to history.Leave a comment:
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With respect to ballast tank size, keep in mind, that the ventilation masts and some mechanical gimmicks will also increase the above-surface volume.
I underestimated those contributions substantially with my big U1 and a not optimum waterline was the result.Leave a comment:
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And yes, for ease of populating it with the devices and what-nots, it would have been easier to go with the 2.5" cylinder, but at that diameter there would have been precious little annular space in which to cram the foam needed to negate the weight of the fixed ballast weight down in the keel. (that little Type-21, even with the 2" WTC had little room between cylinder and hull for such foam, and as a consequence static roll stability is ... to be kind... 'marginal').Leave a comment:
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Yup, nothing beats actual measurements.
But did I get my computation close to needed tank length for the U1 if you use a 2" SD?
A 2.5" SD would only require a 3" length of BT.
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So you're using a direct method to measure how long your ballast tank will be given the volume from weighing the above water parts (1gm of water= 1cc).
you could calculate it using this
Height of cylinder (or length) = V
Value of Pi × r²
V= volume
Pi= 3.14159
r = radius of cylinder
example:
If you have a 2" dia cylinder that requires a ballast tank volume of say 250ml (15.25 in³ )
15.25 = 4.85 in
3.14159 x 1
Your BT needs to be 5 inches long
or here's a calculator you can use
https://www.omnicalculator.com/math/height-of-cylinder
But I won't.
Math is not my strong suit.
DavidLeave a comment:
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So you're using a direct method to measure how long your ballast tank will be given the volume from weighing the above water parts (1gm of water= 1cc).
you could calculate it using this
Height of cylinder (or length) = V
Value of Pi × r²
V= volume
Pi= 3.14159
r = radius of cylinder squared
If you are holding a 2" dia cylinder that requires a ballast tank volume 8 oz. (14.4 in³ )
14.4
3.14159 x 1
=4.5 in
Your BT needs to be 5 inches long
or here's a calculator you can use
Last edited by redboat219; 01-22-2025, 09:03 PM.Leave a comment:
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