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USS Canonicus (MMA 12) in reserve after 1955.

USS Canonicus (MMA 12) in reserve after 1955.
Click on this photograph for links to larger images of this class.

Class: CAMANCHE (ACM 11)
Design: Army MP Design 201
Displacement (tons): 910 light, 1,315 full (14-16: 1,300 full)
Dimensions (feet): 188.7' oa, 176' wl x 37' wl x 17.75' moulded depth
Armament: none, except 2-20mmS in MMA 12 from 1956
Accommodations: 11 officers, 54 enlisted
Speed (kts.): 12
Propulsion (HP): 1,200
Machinery: Skinner Unaflow steam reciprocating (3 cylinders), 2 boilers (210psi/491deg), 2 screws

Construction:
ACMNameReclasBuilderKeelLaunchComm/Svc
11CAMANCHE2 Dec 1949Marietta, Pt. Pleasant, WV19411942No
12CANONICUS20 Dec 1949Marietta, Pt. Pleasant, WV19417 Sep 194220 Dec 1949
13MIANTONOMAH25 Jan 1950Marietta, Pt. Pleasant, WV194124 Dec 194225 Jan 1950
14MONADNOCK21 Mar 1951Marietta, Pt. Pleasant, WV19411942No
15NAUSETT21 Mar 1951Marietta, Pt. Pleasant, WV19411942No
16PURITAN21 Mar 1951Marietta, Pt. Pleasant, WV19411942No

Disposition:
ACMNameTDecomm/CustStrikeDisposalFateMA Sale
11CAMANCHE--1 Jul 19602 Feb 1961Sold--
12CANONICUS30 Jun 19551 Jul 196030 Jan 1961Sold--
13MIANTONOMAH10 Jul 19551 Jul 196017 Feb 1961Sold--
14MONADNOCK--1 Jul 196014 Mar 1961Sold--
15NAUSETT--1 Jul 196018 Apr 1961Sold--
16PURITAN--1 Nov 195925 May 1960Sold--

Class Notes:
Built for the US Army Coast Artillery Corps, Mine Planter Service, to Army Design 201 for a 188-foot twin-screw steel steam-propelled mine planter. The specifications were dated November 1940 and modified in May 1941. The contract for MP 1-12 was dated 18 January 1941 and the ships were delivered between April and December 1942. A second contract dated 4 August 1941 added MP 13-16 which were delivered between February and May 1943. Of these 16 ships the Navy took over eight during World War II as ACM 1-3 and 5-8 (see the CHIMO (ACM 1) class) and never took over MP 4 or MP 6 (GEN SAMUEL L MILLS and BG HENRY L ABBOTT respectively).

On 23 November 1949 SECNAV promulgated a notice stating that incident to the transfer of the functions of controlled mining from the Army to the Navy, the Senior Planter vessels (MP) and Junior Planters (JMP) to be acquired from the Army would be classified in the Navy as Auxiliary Mine Layers (ACM) and Motor Mine Planters (YMP) respectively. (JMP 70, built in 1943, became YMP 1 on 30 December 1949 and SGT TRUMAN O OLSON, built in 1948, became YMP 2 on 14 December 1949.) The Navy classifications and hull numbers ACM 11 through 13 were approved for BG (Brig. Gen.) ROYAL T FRANK (MP 12), MG (Maj. Gen.) ERASMUS WEAVER (MP 10), and COL HORACE F. SPURGIN (MP 14) respectively. "Names will not be formally assigned to the above vessels." Of these one went immediately to reserve while the other two served in commission until 1955. On 7 March 1951 the Secretary of the Army approved the transfer of the other three and CNO directed that they be placed in caretaker status as ACM 14 through 16 pending receipt of further instructions. They were never commissioned. All six were reclassified from ACM to MMA 7 Feb 1955 and given Navy names on 26 April 1955 effective 1 May 1955. Note that the Navy name of ACM 13 was spelled with "AH" at the end, not the traditional "OH."

The Army's mine planters were unusual in having Skinner Unaflow engines, as did the Navy's LSD 1-8 (see AV 21), its CASABLANCA (CVE 55) class escort carriers, and the Maritime Commission's S3 cable ships that became ARC 2 and 6. In a Unaflow (trademark) or uniflow (generic) engine, steam entered alternatively at the ends of the cylinder, which were always hot, and exhausted at the center, which was cooler, reducing the energy spent in a conventional reciprocating steam engine in alternatively heating and cooling the cylinder walls.

Ship Notes:
ACMNameMANotes
11CAMANCHEEx Army BG ROYAL T FRANK (MP 12, deliv Dec 1942). Comm. 28 Nov 1942 (Army). To reserve fleet at New York after acq., never comm. in USN. Tuna fishing vessel PILGRIM 1961, CAPE COD 1978. Fate unk.
12CANONICUSEx Army MG ERASMUS WEAVER (MP 10, deliv ca. Nov 1942). Accepted from the Army and placed in comm. 20 Dec 1949 as USS ACM 12 at Balboa in the Canal Zone. Commenced inactivation 28 Mar 1955, arrived at Philadelphia 13 Apr 1955, in commission in reserve there 2 May 1955, out of commission in reserve 30 Jun 1955. Yacht OCEANSTAR 1963 (converted to diesel), then KIPMAN, ZODIAC, GOLDEN CREST, then Sandy Hook pilot boat NEW JERSEY (PILOT NO. 2) 1969. BU 1993.
13MIANTONOMAHEx Army COL HORACE F SPURGIN (MP 14, deliv. Mar 1943). Placed in comm. 25 Jan 1950 as USS ACM 13 at Treasure Island, Calif. Commenced inactivation 14 Mar 1955, to Long Beach 14 May 1955 and placed in service in reserve for inactivation there, out of commission in reserve 19 Jul 1955. Delivered to buyer 28 Feb 1961, Tuna fishing vessel NAUTILUS 1960, ALEUTIAN MIST 1990, NEW STAR 1991. On 12 Aug 2009 NEW STAR was part of the breakwater at Tyee Marina in Tacoma, WA. BU 11 Jan 2013.
14MONADNOCKEx Army MAJ SAMUEL RINGGOLD (MP 11, deliv ca. Dec 1942). Army approved transfer 7 Mar 1951, custody transferred to COM 15 (Canal Zone) by CG US Army Caribbean and designated ACM 14 on 15 Mar 1951, moved from Canal Zone to NSY Boston 17 Apr - 4 May 1951, transferred from Army to Navy caretaker staus 20 Oct 1951, inactivation completed and placed out of commission in reserve at Boston 15 Oct 1952. Never comm. in USN. Yacht TAHITI 1964, AMAZONIA 1983, DEAR 1984, MAXIM'S DES MERS 1986, MAJESTIC 1989, MAXIM'S DES MERS 1990. Lost 23 Jul 2004.
15NAUSETTEx Army MG WALLACE F RANDOLPH (MP 7, deliv ca. Oct 1942). Army approved transfer 7 Mar 1951, assigned to reserve fleet at Charleston, SC. Left Charleston 26 Jan 1958 and arrived at San Diego 3 May 1958 for continued layup. Never comm. in USN. SecNav approved disposal 30 Jun 1960. Delivered to buyer 17 May 1961. Oilfield exploration ship SEA SEARCHER, to Florida Power & Light by 1966 as a stationary target for lightning research and renamed THUNDERBOLT. Scuttled as artificial reef 3 Mar 1986 off Marathon, Florida.
16PURITANEx Army COL ALFRED A MAYBACH (MP 13, deliv Feb 1943). Army approved transfer 7 Mar 1951, to reserve fleet at San Francisco, later at Mare Is. Never comm. in USN. Fishing vessel PURITAN, renamed WHITE STAR 1972. Caught fire 11 Feb 1984 near Nauru, sank 13 Feb 1984.

Page Notes:
Compiled: 4 Oct 2021
© Stephen S. Roberts, 2021