USS Helori (SP-181)
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|Namesake:||Previous name retained|
|Builder:||Johnson Brothers and Blanchard, Seattle, Washington|
|Acquired:||23 April 1917|
|Commissioned:||21 May 1917|
|Reclassified:||From section patrol craft (SP-181) to district patrol craft (YP-181) in 1920|
|Fate:||Sold 17 September 1925|
|Notes:||Operated as civilian motorboat Helori 1911-1917|
|Length:||92 ft 4 in (28.14 m)|
|Beam:||15 ft 8 in (4.78 m)|
|Draft:||5 ft 6 in (1.68 m)|
|Installed power:||200 horsepower (0.3 megawatt)|
|Propulsion:||One standard gasoline engine, one shaft|
|Armament:||2 × 6-pounder guns|
Helori was built as a civilian motorboat of the same name in 1911 by Johnson Brothers and Blanchard at Seattle, Washington, for use as a pleasure craft. The U.S. Navy purchased her from her owner, either Omar J. Humphrey  or H. G. Kenney of Seattle, on 23 April 1917 for World War I service as a patrol vessel. She was commissioned as USS Helori (SP-181) on 21 May 1917 at Puget Sound Navy Yard, Bremerton, Washington.
Assigned to the 13th Naval District, Helori was the only section patrol boat on the United States West Coast fitted with the 220-horsepower (0.3-megawatt) standard gasoline engine adopted for use in World War I submarine chasers, and she operated out of Puget Sound Navy Yard training engine room crews for submarine chasers and performing guardship duty. She made frequent trips to and from Bremerton and Seattle.
In 1920, Helori was reclassified from section patrol craft to district patrol craft and was redesignated YP-181
- Per the Dictionary of American Naval Fighting Ships (at http://www.history.navy.mil/danfs/h4/helori.htm).
- Per the Naval History and Heritage Command Online Library of Selected Images (at http://www.history.navy.mil/photos/sh-usn/usnsh-h/sp181.htm).
- This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.
- Department of the Navy: Naval Historical Center: Online Library of Selected Images: U.S. Navy Ships: USS Helori (SP-181, later YP-181), 1917-1925. Previously the civilian motor boat Helori (1911)
- NavSource Online: Section Patrol Craft Photo Archive YP-181 ex-Helori (SP 181)