Question about the Mk 38 Mod 3 Machine Gun System

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Joined: March 15th, 2004, 8:39 pm

June 9th, 2018, 11:11 am #11

whyaretherecats wrote: Thanks Tony. I was really wondering whether it could be used on something like a family-sized motorboat. Is that a definite no-no?
No, not even close.  The joke picture above of the BMG in a rowboat shows the size of this weapon in relationship to a small boat.  In reality, the recoil of firing that weapon in such a craft would almost certainly overturn it.

For a modern, militarily-useful patrol boat, it needs to carry a couple of radars, multiple radios, direction finders, safety gear and other equipment that were not around in WWII.  Those things all add weight, much of it high in the ship where it affects stability.  Which is why something like a modern-day 1,500 ton corvette carries relatively little armament, perhaps a 76mm gun and a couple of 25mm, compared to a similar-size 1930s-40s destroyer.

If you don't care about being militarily useful and just want a MG, then putting something like a 7.62mm MG on a 25ft power boat is possible.  Not sure what you'd do with it.
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Joined: July 8th, 2007, 8:30 pm

June 12th, 2018, 7:13 pm #12

He mentioned that they would close quietly at night into a bay with a Japanese installation and fire a few rounds then hit the gas and leave.  He specifically stated an AT gun and that it was mounted on the rear but I suppose it could have been from a P-39.
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Joined: March 5th, 2018, 2:38 pm

June 12th, 2018, 7:15 pm #13

foscadh wrote:He mentioned that they would close quietly at night into a bay with a Japanese installation and fire a few rounds then hit the gas and leave.  He specifically stated an AT gun and that it was mounted on the rear but I suppose it could have been from a P-39.
Very likely could have been, given how resourceful the crews were.


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Joined: April 10th, 2006, 7:48 pm

June 17th, 2018, 2:59 am #14

foscadh wrote: He mentioned that they would close quietly at night into a bay with a Japanese installation and fire a few rounds then hit the gas and leave.  He specifically stated an AT gun and that it was mounted on the rear but I suppose it could have been from a P-39.
There is another possibility: the M9 aircraft gun, a belt-fed version of the M1 AA gun modified for use in aircraft (including the P-39) which never saw service in an aircraft, but a handful were fitted to PT boats. Instead of the medium-velocity 37x145R round of the M4, this fired a high-velocity 37x223SR which was almost identical to the 37x223R fired by US tank/anti-tank guns.


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Joined: November 6th, 2012, 1:52 am

June 17th, 2018, 10:52 pm #15

As an aside PT-109 carried an army 37mm anti tank gun lashed down to the foredeck on her final mission.
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