Tuesday, April 2, 2024

Enigma Answer-- From Earlier Today....


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There were two basic types of propulsion. The first was the alcohol powered G7a combustion steam engine which provided three preset speeds – 44 knots at 5,000m; 40 knots at 7,500m; 30 knots at 12,500m. However the maximum setting of 44 knots frequently overloaded the engine and this setting was banned until the problem was solved in the middle of the war. Alcohol fuel and compressed air powered the torpedo’s four-cylinder engine, which in turn spun two counter rotating hollow drive shafts, one inside of the other. The drive shafts turned two six bladed propellers, which spun in opposite directions so as not to create torque which would distort the torpedo’s course. Spent exhaust gases were expelled at the tail end of the torpedo. Although very reliable and possessing good range, the G7a left a visible trail of bubbles on its way to its target. This could warn targets of the impending attack and allow them time to evade. Because of this, it was used mainly for long-range or night attacks. 


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  1. As nefarious as those Torpedoes were, I can't help but admire the engineering that went into the propulsion systems. Can only imagine the training the U-Boat crew went through to get them out of the tubes.

  2. Only had to run once...

  3. When I read that the explosive charge was made up of Schiesswolle, my brain reversed the "i" and "e" and had to ponder that for a coupla minutes. Decided it must be because they delivered a whole sh*t-load of hurt, before realizing my error.

  4. The Japanese had the best torpedo of any nation during WWII. It started up with normal air to get to operating temperature, and then switched to pure oxygen. This eliminated the bubble wake from alerting the target, and gave the torpedo double the range of the Allies torpedoes.

  5. Soooo.......say that I bought it. And that I could get it to run.
    Now what do i do with it? How would I put it to good use?
    President Elect B Woodman

  6. I still haven't had my coffee yet, (the stinking machine is broken) so I still don't understand the hint about how William Herschel seeing Uranus in 1781 is connected to a torpedo engine.
    I'll probably kick myself when I realize.

  7. Fueled by alcohol, that must be why old submariners called moonshine "torpedo juice".

  8. Wilber and Orville’s first only had four cylinders but it was a straight four

  9. and it fit into a 21" diameter torpedo........

  10. I believe that by the end of the war American 'fish' were electric.


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