HMCo #506p APc91
Particulars
Name: APc91Type: Navy Coastal Transport
Designed by: McInnis, Eldredge
Contract: 1942-9-2
Launch: 1943-4-1
Construction: Wood
LOA: 103' 2.5" (31.46m)
LWL: 98' 6" (30.02m)
Beam: 21' 2.5" (6.46m)
Draft: 8' 3.625" (2.53m)
Displ.: 112.0 short tons (101.6 metric tons)
Propulsion: Diesel, Superior, 400 h.p.
Propeller: 1 - 3 blade
Built for: U.S. Navy
Amount: $145,950.00
Note(s) in HMCo Construction Record: U.S. Navy Troop Transports
Note: Particulars are primarily but not exclusively from the HMCo Construction Record. Supplementary information not from the Construction Record appears elsewhere in this record with a complete citation.
Model
Model location: N/A (Missing, nonexistant or unidentified model)
Vessels from this model:
22 built, modeled by McInnis, Eldredge
Note: This model is missing, is nonexistant or has not been identified. The number of vessels built from it is only an estimate based on similar features, such as dimensions, rig, machinery, etc.
Offsets
Offset booklet number(s): HH.4.082
Offset booklet contents:
#413p, #414p, #411p, #412p, ['No 425' (sic, ie. #411p) Class Amc Coastal Transports']
Offset Booklet(s) in Haffenreffer-Herreshoff Collection. Francis Russell Hart Nautical Collections, MIT Museum, Cambridge, Mass. (Restricted access --- see curator.)
Drawings
List of drawings:
Drawings believed to have been first drawn for, or being first referenced to
HMCo #506p APc91 are listed in bold.
Click on Dwg number for preview, on HH number to see at M.I.T. Museum.
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Dwg 067-000 (HH.5.04804): Proposed Steering Gear for Apc Boats (1942)
Note: The Haffenreffer-Herreshoff Collection is copyrighted by the Francis Russell Hart Nautical Collections of the MIT Museum in Cambridge, Mass. Permission to incorporate information from it in the Herreshoff Catalogue Raisonné is gratefully acknowledged. The use of this information is permitted solely for research purposes. No part of it is to be published in any form whatsoever.
Documents
Other Herreshoff Family
"Model of AMc Mine Sweepers [preceding two words crossed out and replaced with] Transports, Apr[il] 1942.
Scale 3/8" = 1.
Templets[sic] made from Bureau of Ships Plans 446519 [and] 446513 and Eldridge-McInnis.
Design No. 287-C-728 Plan No 1.
In order to come fair the model differs from lines as follows:
Waterlines are fuller amidships with more tumble home.
Buttocks are raised forward of sternpost, deadwood faired.
Frame spaces 18.4".
Stations are 3-frame spaces or 4.6', except # 11 - # 11A which is 4-frame spaces or 6.132'.
Deduct 2 3/4" for planking.
Deduct 2 7/8" for deck.
Load W.L. is 10'-0" above base.
Stem as per Eldridge-McInnis plan E-McI. Hull No. 274, Sheet 1.
Bureau of Ships Plan No. 446513." (Source: Herreshoff, A. Sidney DeW.? [Penciled note in Offset Booklet HH.4.082.] Haffenreffer-Herreshoff Collection, MIT Museum, Cambridge, MA.)
Other Modern Text Source(s)
"Class: APC-1
Design: Navy APC-1
Displacement (tons): 161 light, 258 lim.
Dimensions (feet): 103.25' oa, 98.2' wl x 21.25' e x 9.25' lim.
Original Armament: 4-20mm single
Later armaments: 2-20mm single (1943: APc 87-90, 93-98, 110-111)
Complement: 21 (1944)
Speed (kts.): 10
Propulsion (HP): 400
Machinery: Diesel, 1 screw
...
APc-91; [contracted: ] 2 Sep 42; [builder: ] Herreshoff Mfg; [keel laid: ] 19 Nov 42; [launched: ] 1 Apr 43; [commissioned: ] 22 May 43; [decommissioned: ] 16 Feb 44; [struck: ] 7 Jan 57; [disposed: ] --; [fate: ] Unknown; [MA sale: ] --; [note: ] Decommissioned and placed in service 16 Feb 44 at Bermuda. Converted to personnel ferry late 1945. Assigned to boat pool duty in Narragansett Bay on 3 Dec 45 and 19 Jun 46. Out of service in reserve 28 Oct 49. In USN reserve 1949-57.
...
Of this large class, only ten units, APc 85-94, were assigned to the Atlantic Fleet. One was transferred to Ecuador, and the others were soon relegated to use as personnel ferries for local naval facilites and eventually disarmed, placed out of commission and put in service with reduced crews as district craft. In July 1945 their passenger capacity was set at 250 persons (with the addition of ballast and removal of armament), and in this role they were found to be much more suitable than LCIL's or LCM's. In September 1945 CinCLant wanted to use two at Bermuda, one at Newport, and six at Casco Bay, Maine. These were the only vessels of this class to see postwar service. ..." (Source: Roberts, Stephen S. "Class: APC-1." Compiled October 26, 2008. http://www.shipscribe.com/usnaux/APC/APC01.html, retrieved October 25, 2011.)
Maynard Bray
"Twenty-two of these 'jacks of all trades' were built between October 1942 and July 1943 --- with an average of nearly one of these 103-footers each week. Each cost $145,750, and they appear to have been contracted for in two batches, with the lead ship [#425p] of the class (APc 1) included in the first batch of ten; APc 85 [#500p] through APc 96 [#511p] constituted the second batch. It was an impressive rate of production, especially so because the APcs were built concurrently with eight 71-foot British Vosper torpedo boats, which were built in the South Construction Shop." (Source: Bray, Maynard and Carlton Pinheiro. Herreshoff of Bristol. Brooklin, Maine, 1989, p. 226-227.)
Supplement
From the 2000 (ca.) Transcription of the HMCo Construction Record by Vermilya/Bray
Year: 1943
E/P/S: P
No.: 506p
Name: APc91
OA: 103' 2 1/2"
LW: 98' 1 1/2"
Source: Vermilya, Peter and Maynard Bray. "Transcription of the HMCo. Construction Record." Unpublished database, ca. 2000.
Note: The transcription of the HMCo Construction Record by Peter Vermilya and Maynard Bray was performed independently (and earlier) than that by Claas van der Linde. A comparison of the two transcriptions can be particularly useful in those many cases where the handwriting in the Construction Record is difficult to decipher.
Research Note(s)
"The design of the APc Coastal Transport Class was based on that of the Eldredge McInnis-designed 93ft AMc Minesweeper, lengthened by a 6ft plug. [Information based on a plaque at the Herreshoff Marine Museum.]" (Source: van der Linde, Claas. December 14, 2008.)
"Built in 211 days (contract to launch; equivalent to $692/day, 1062 lbs displacement/day)." (Source: van der Linde, Claas. January 16, 2024.)
"[Displacement 100 long tons.]" (Source: http://www.navsource.org/archives/09/23/23009.htm, retrieved March 29, 2011.)
Note: Research notes contain information about a vessel that is often random and unedited but has been deemed useful for future research.
Note
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