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Topic: Engine Idenity |
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Frank J Andruss Sr
TOP BOSS
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 Posted on: Jan 9, 2009 - 11:49pm
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I was told this was PT 6 Engine Room. Now this was Higgins first built PT 6. Can any of you confirm this, or identify the engines. I am pretty sure they are Vimelert.
Thanks,
Frank
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Dick
Moderator
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Posted on: Jan 10, 2009 - 12:46pm
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Frank , I just sent a couple of emails with some large attachments with info on Engine/Engine Room PT-6 (Prime). The engines might actually be Hall-Scott engines as used in early 70' Vosper MTB's 35, 36, 37, 38. Due to none delivery of the Vimalert Engines.
Dick . . .
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Frank J Andruss Sr
TOP BOSS
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Posted on: Jan 10, 2009 - 5:42pm
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Dick, the more I look at the picture I am conveniced that this is an all metal boat. Maybe I am all wet here, but I do not think this is PT 5 or the first PT 6. Any thoughts guys..........
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Ray Wilbur
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Posted on: Jan 11, 2009 - 7:24am
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I agree with you Frank. Definately all metal. What engines were in the PTF Nasty's?
Ray
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Will Day
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Posted on: Jan 11, 2009 - 8:45am
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Frank: I think you are right about it being a metal boat, maybe PT-8 with the original Allisons?
Will |
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Dick
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Posted on: Jan 11, 2009 - 12:22pm
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I don't think PT-8,
I had seen a photo of the engine room for her when she was on eBay for sale and the engine room was much larger. This engine room really looks narrow and the walls seem to be at a very sharply canted angle. PT-5 and PT-6 did have a bulkhead access door to the engine room unlike other PT's. But their WT doors were offset off-center to starboard side this photo shows a center door. Got Me - well I've spend my last two cents, got to go.
Dick . . . .
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alross2
TOP BOSS
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Posted on: Jan 11, 2009 - 1:47pm
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The PTFs (which were wood) had the huge Napier DELTIC diesels.
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Frank J Andruss Sr
TOP BOSS
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Posted on: Jan 11, 2009 - 2:32pm
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Looks as though the exhaust is being vented to the sides of the Hull. We know that Higgins vented to the sides of the Hull. What other boats did. Mind you, this photo came to me in a bunch of photos marked Higgins PT 6. If you experts out there are confused, then nobody knows.....
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Jerry Gilmartin |
TOP BOSS
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Posted on: Jan 11, 2009 - 3:28pm
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Hi Frank and Dick and AL and everyone else!
So I poured through my files and the Louisiana Digital Library http://louisdl.louislibraries.org/ and found some interesting stuff to answer these questions. Frank first of all, why do you always ask so many hard questions?
OK so here goes. To see these blueprints for yourself, just go the the Louisiana Digital Library, then under the heading Browse Collections by (in the top left hand side) click on the line labeled Collection Name. Then the next page comes up listing all the collections.
Scroll down until you see Higgins Industries and click on it.
Then Click on Browse Items in this Collection hypertext, and 32 pages of 639 numbered blueprints will be listed.
There are about 20 per page and 32 pages on the index.
I think Franks question is about a photo of the 76 foot Motor Torpedo Boat According to the blueprint named Inboard Profile and Arrangement It is listed as drawing 355 on page 18, and is dated 8-18-41. This is not PT5 or PT6. It shows the overhead and side views of the engineroom and the Watertight door is on the centerline of the forward bulkhead.
Several other blueprints to support this are #112 Cooling System for Vimalerts on PT5. listed on Page 6
#85 Center Engine Exhaust Pipe (apparently for 76 foot MTB) dated 6-30-41 on page 5.
#686 Vimalert Engine Exhaust Pipes on page 32
OK so here is the blueprint section I hope this shows up OK. Jerry
Next is another picture of the same engines from the perspective of the watertight door. If you look treal hard you can see the word Scott as in Hall Scott Defender engine on the front of the engine in the background, (the word is framed by the ladder rungs).
Next is a couple of photos of the real Vimalert engines, and if you compare the engineroom pictures to these actual Vimalerts you can see they are difinitely different.
Side view of Vimalert Engine
Front view of Vimalert engine ( notice how different it is from one in engineroom picture!
In summary, this is why I think these are Hall Scott engines inside of PT70 aka MRB2 taken sometimes in late 1941 Jerry
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Dick
Moderator
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Posted on: Jan 11, 2009 - 4:21pm
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Jerry, Frank and all . . .
Great shots Jerry, thanks much.
Frank, Below find two (quicky cut & paste) drawings also from the Louisiana Digital Library these show cross sections of the haul with the Exhaust detailed. Interesting note however, on PT-5 an earlier drawing (not attached) from May of 1940 showed the exhaust being vented to the aft of the boat similar to the ELCO's. However the drawing I included below is much later from December of 1940 it shows a revised porting of the exhaust to the sides.
One of the engine photos posted by Jerry show the Hall-Scott Engines that Higgins used in there own designed 76' MTB first built for Finland but diverted to the UK by the U.S. government in fear the Germans might capture them. After the initial five boats another five boats were built for the UK.
The PT-6 drawings always showed side port exhaust.
Here we go . . . .
PT-5 Drawing
PT-6 Drawing
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