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Topic: Post War Activities With PT 8 |
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smallwi
MASTER
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Posted on: Jun 17, 2025 - 7:48am
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Trip to NARA last month yielded some interesting information about the activities of PT 8 in 1948. On a previous trip I located structural analysis done on the boat to validate strength calculations of the four Post War PT boats, PT 809-812.
On this trip I found documentation that PT 8 had the Packard 5M-2500 W-51 engines installed, as well as a propeller change. This work was performed by John Trumpy & Sons, who were also building PT 811.
PT 8 was being used as a test bed for a cycloidal propeller being considered for the post war boats.
Bill
Bill Smallshaw |
Total Posts: 151 | Joined:
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TED WALTHER |
TOP BOSS
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 Posted on: Jun 17, 2025 - 5:54pm
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Interesting Bill!
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smallwi
MASTER
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Posted on: Jun 18, 2025 - 12:40pm
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Ted,
The other interesting part of these memos, only four boats ultimately had the 5M-2500 engines installed. All late war production boats were equipped with the 4M-2500. The four boats referenced above did not swap out the 4M-2500 engines for the 5M-2500 until 1948.
Bill
Bill Smallshaw |
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Jerry Gilmartin |
TOP BOSS
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Posted on: Jun 18, 2025 - 1:46pm
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Three 5M-2500s were removed in 1993 from the hulk of PT659, located at Camp Wythecombe in Oregon. Evidently, the Navy originally installed them when the 659 was stationed at Pt Mugu likely sometime during the 1950's. I wonder if they were the same ones that Bill mentioned above, or a different set of engines from a different contract.
Jerry Gilmartin
PT658 Crewman
Portland OR |
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smallwi
MASTER
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Posted on: Jun 19, 2025 - 7:09am
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Jerry,
254 of the 5M-2500 engines were manufactured starting in 1944 through 1948. Your comment makes me reconsider the potential that boats built in mid to late 1945 had the 5M installed when they were constructed.
Bill
Bill Smallshaw |
Total Posts: 151 | Joined:
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