XM 66 Tank Proposal
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#1: XM 66 Tank Proposal Author: Dontos, Location: Vine Grove, KY PostPosted: Sun Mar 08, 2009 7:51 pm
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This is a 'spin-off' Vehicle from the T95 Program.
#2: Re: XM 66 Tank Proposal Author: bsmart, Location: Central Maryland PostPosted: Sun Mar 08, 2009 8:11 pm
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Interesting - You say it was a spinoff of teh T95 program. Where does this fit in the M60A2 genisis? The picture looks like an M6A1E1 or M60A2. Could it be that the Army decided that it would be easier to get the program survive by either giving it a new designator (XM66) or developing it as a member of the M60 family
#3: Re: XM 66 Tank Proposal Author: tanker2010, Location: Kansas City, Mo. PostPosted: Sun Mar 08, 2009 8:30 pm
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It does have a strange hull. While it has the shape and fenders of a M60, it has 5 return rollers.
#4: Re: XM 66 Tank Proposal Author: Dontos, Location: Vine Grove, KY PostPosted: Sun Mar 08, 2009 8:37 pm
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The turret is similiar to the T95 test bed at the LST buiding.
(NOTE: The 20mm gun is removed, but mount location is obvious)





This is around the time of the M60A2 development.

Don
#5: Re: XM 66 Tank Proposal Author: Joe_D, Location: Razorback Country PostPosted: Tue Mar 10, 2009 2:12 am
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XM66 is the now known as M60A2 program.

That's a poor picture of M60 hull 9B4470 with the proposed "A" model turret. I think I posted a copy of it a while back.

In it's early stages the adaptation of the 152mm gun/launcher to the M60 was called the XM66. They reviewed 4 turret types, A, B, C, and D. "A" and "B" were similar compact types, with the "B" model being taller. The "C" model was very similar in appearance to an over grown M551 turret, and the "D" was a modified M60A1 turret with shorter rear. In early 1965 they changed the program name to M60A1E1. The "B" model ended up being selected and eventually became the M60A2.
#6: Re: XM 66 Tank Proposal Author: Andrei,  PostPosted: Thu Jan 27, 2022 3:19 pm
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Interesting if any alternative armament options were considered for XM 66 or M60A2 at the initial development (60s), later they considered 120 mm US and British guns, as well as M68.
#7: Re: XM 66 Tank Proposal Author: Harold_Biondo,  PostPosted: Sat Dec 03, 2022 6:17 pm
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- Joe_D
XM66 is the now known as M60A2 program.

That's a poor picture of M60 hull 9B4470 with the proposed "A" model turret. I think I posted a copy of it a while back.

In it's early stages the adaptation of the 152mm gun/launcher to the M60 was called the XM66. They reviewed 4 turret types, A, B, C, and D. "A" and "B" were similar compact types, with the "B" model being taller. The "C" model was very similar in appearance to an over grown M551 turret, and the "D" was a modified M60A1 turret with shorter rear. In early 1965 they changed the program name to M60A1E1. The "B" model ended up being selected and eventually became the M60A2.


If this was referring to the tank that is in Armada Michigan, that is not in fact the XM66D (or A, in this case) turret, it is the T95S turret. S standing for Shillelagh. There was some cross-pollination going on between the M60A2 and T95 programs. The actual description of the XM66D does not match up with the T95 turret. The tank in Armada was built from the beginning on the M48 chassis, according to the original work order for it I found in the archives. The T95 and M60 hulls with T95S turrets were separate individuals entirely, since three T95S turrets were built, according to Hunnicut.
#8: Re: XM 66 Tank Proposal Author: Joe_D, Location: Razorback Country PostPosted: Wed Feb 01, 2023 4:08 pm
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Hi Harold and welcome.

The tank in Armada Michigan has the old Main Battle Tank - Medium Range (MBT-MR) turret installed. That’s why it has the driver in the turret position. This was the progenitor to the MBT70/XM803 program and envisioned as early as 1958. It was used as an ersatz "D" model turret demonstrator for what was to become the M60A2. The "D" model turret proposed in 1961 was supposed to be a basic M60A1 turret modified to accept the 152mm gun/launcher and associated equipment. None were produced. Instead, they realized a modified MBT-MR three-man turret without the driver could be made just as fast. At the same time, the Compact Turret designed by Clifford Bradley originally envisioned for the MBT-MR was considered for the M60/Shillelagh system. This unique type of turret is what the M60A2 eventually used, and the “A” and “B” models were alternate versions. The picture posted by Don "Dontos" Moriarty (RIP) is of M60 hull RN 9B4470 and has the “A” model Clifford Bradley designed turret, aka "Compact Turret". They eventually ended up on the T95 hulls that were used to test systems being developed for the MBT70/XM803. The T95 hulls being relegated to this duty when its program was cancelled in 1959. The three T95S turrets requested for the Shillelagh program were the T95/96 Turrets already produced for the T95 program and originally designed to have a fixed mount, no recoil, hypervelocity gun. They were modified to accept the M81 152mm Gun/Launcher and were installed on M48A1 gasser hulls to conduct test firing at White Sands Missile range by Aeronutronic Philco-Ford. Below are pictures of one conducting live fire tests. Once the M551 pilots were made these rigs were no longer needed.





About that M48 hull at Armada. I wrote a post years ago and ID'd it as having the "D" turret erroneously. The hull is one of the 6 M48A1’s converted to AVDS-1790 diesel and eventually became one of the two pilot M48A3’s. Here is a link to it: Pilot M48A3. The plaque installed in front of her is wrong. The only XM66 connection was the turret being used as a demonstrator for the D model turret. Here is a picture of 9B4470 with it:
#9: Re: XM 66 Tank Proposal Author: Doug_Kibbey, Location: The Great Satan PostPosted: Sun Feb 26, 2023 7:57 pm
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Hi Joe! Thanks for checking in. With regard to the test rig shown in Don's old post...do you know if MICOM was using that or a similar rig? Was any firing done at Redstone or if part of a MICOM operation, perfomed exclusively at White Sands? I've been trying to establish what platform was being used in the tests that were referred to by MICOM reps at a 1969 meeting at Ft. Knox. They assiduously avoided any use of or comment on Shillelagh launches involving an actual Sheridan. There are two tests in particular I'm interested in: First was a "shoot-off" between Shillelagh and M60A1. Second was a series of Missile Readiness firings they cited to anybody who would listen....503 missiles, 91% successful hit rate. It was a lie and 162 of those missiles were not even fired.
I'd love to know if this was the rig likely in use?
Best regards,
D.

- Joe_D
Hi Harold and welcome.

The tank in Armada Michigan has the old Main Battle Tank - Medium Range (MBT-MR) turret installed. That’s why it has the driver in the turret position. This was the progenitor to the MBT70/XM803 program and envisioned as early as 1958. It was used as an ersatz "D" model turret demonstrator for what was to become the M60A2. The "D" model turret proposed in 1961 was supposed to be a basic M60A1 turret modified to accept the 152mm gun/launcher and associated equipment. None were produced. Instead, they realized a modified MBT-MR three-man turret without the driver could be made just as fast. At the same time, the Compact Turret designed by Clifford Bradley originally envisioned for the MBT-MR was considered for the M60/Shillelagh system. This unique type of turret is what the M60A2 eventually used, and the “A” and “B” models were alternate versions. The picture posted by Don "Dontos" Moriarty (RIP) is of M60 hull RN 9B4470 and has the “A” model Clifford Bradley designed turret, aka "Compact Turret". They eventually ended up on the T95 hulls that were used to test systems being developed for the MBT70/XM803. The T95 hulls being relegated to this duty when its program was cancelled in 1959. The three T95S turrets requested for the Shillelagh program were the T95/96 Turrets already produced for the T95 program and originally designed to have a fixed mount, no recoil, hypervelocity gun. They were modified to accept the M81 152mm Gun/Launcher and were installed on M48A1 gasser hulls to conduct test firing at White Sands Missile range by Aeronutronic Philco-Ford. Below are pictures of one conducting live fire tests. Once the M551 pilots were made these rigs were no longer needed.





About that M48 hull at Armada. I wrote a post years ago and ID'd it as having the "D" turret erroneously. The hull is one of the 6 M48A1’s converted to AVDS-1790 diesel and eventually became one of the two pilot M48A3’s. Here is a link to it: Pilot M48A3. The plaque installed in front of her is wrong. The only XM66 connection was the turret being used as a demonstrator for the D model turret. Here is a picture of 9B4470 with it:
#10: Re: XM 66 Tank Proposal Author: Joe_D, Location: Razorback Country PostPosted: Fri Mar 31, 2023 5:01 pm
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Hi Doug,

I can say for certainty that the M48/T95 rig wasn't used for those tests. Anything else I'd have to unpack some boxes to find the info. Give me some time and eventually I'll be back on a normal routine. Right now I'm way to busy.

Nice to hear from you.
#11: Re: XM 66 Tank Proposal Author: Joe_D, Location: Razorback Country PostPosted: Sat Jul 01, 2023 10:34 pm
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Doug,

Sorry for the long overdue reply. Checked my library and came up with this conclusion. In 1969 there were a very limited amount of M60A1E2's available. 300 were in storage until a satisfactory scavenge system was approved and implemented along with a plethora of other issues. The few available (approximately 14) were distributed between Knox, Aberdeen, Detroit, and Redstone, being used to develop/fix issues with the stabilization system, recoil mechanism, CBSS, FCS, and laser. The M551 was plentiful and capable of conducting these firings. It is highly unlikely they would have diverted any M60A1E2's for a test the M551 could just as satisfactorily conduct. If I find anything else to nail this down, I'll post it.
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