Propellers of the BRP Gregorio del Pilar

[adroth]

The primary casualty the FF-15's grounding has been its propellers.

BRP Gregorio Del Pilar still operational despite grounding: AFP
By Priam Nepomuceno  August 31, 2018, 1:49 pm

http://www.pna.gov.ph/articles/1046548

MANILA -- The Armed Forces of the Philippines (AFP) has assured that the BRP Gregorio Del Pilar, one of the Philippine Navy's largest warships, is still operational after it sustained minimal damage when it ran aground in the vicinity of the Hasa-hasa Shoal in Palawan Wednesday night.

The impact did not cause any heavy damage to the ship's hull, AFP public affairs office chief Col. Noel Detoyato said Friday.

"Damage to the hull is very minimal," Detoyato said, adding that the starboard or right propeller sustained damage due to the grounding.

He, however, maintained that the port or left propeller and engines remained intact.

Major dockyard repair awaits BRP Gregorio Del Pilar
By Priam Nepomuceno  September 3, 2018, 12:58 pm

MANILA -- A major dockyard repair awaits Philippine Navy (PN) flagship BRP Gregorio Del Pilar (FF-15) once she is pulled clear from Hasa-Hasa (international name Half-Moon) Shoal after grounding that resulted in the detachment of her starboard (right) propeller from the shaft.

This was disclosed by Armed Forces of the Philippines (AFP) public affairs office chief Col. Noel Detoyato in an interview with reporters Monday.

The detachment of the starboard propeller was discovered by Coast Guard divers aboard BRP Sindangan (MRRV-4407) and Naval Special Operations Group aboard the grounded frigate during initial assessment dives conducted over the weekend.

Detoyato said the detached propeller was recovered by the divers and is repairable.

[adroth]

What these propellers look like. As per Jane's Fighting Ships:

. . . variable pitch propellers fitted. Engine and propeller pitch consoles are located in wheel-house and at bridge wing stations as well as engine room control booth

https://i.pinimg.com/originals/fd/e9/ce/fde9ce1459d061dfdbcdb12a29f8ad78.jpg

SN Ford with USCGC Boutwell (WHEC 719) on drydock 1976




Photo c/o Zane Johnston

http://picssr.com/photos/zanejohnston/interesting/page101?nsid=52550906@N05

From Zane Johnston's flicker photostream :

USCGC Dallas drydocked at Detyens Shipyard in Charleston, SC (photo taken last Feb 16, 2011).

https://picryl.com/media/the-coast-guard-high-endurance-cutter-uscgc-chase-whec-718-sits-in-the-floating-6aa2d2

The Coast Guard high-endurance cutter USCGC CHASE (WHEC 718) sits in the floating dry dock Titan at the Norfolk Shipbuilding and Drydock Corp. for repairs to its hull.

[jetmech]

  Worry about the shaft & gears.

[horge]

  Worry about the shaft & gears.

So much, this.
The magnitude of force that 'detached' the propellers was transmitted up the shaft
into the gearbox, and these have to be thoroughly assessed for damage.

Any misalignment or deformation issues, if not addressed immediately, you're looking
at cumulative effects, system-wide, as the vessel is operated..

This is why I detest early damage assessments being publicized: it cements in the
public's (and legislature's) mind what needs funding to be fixed,