Position of fin things..
- Thread starter danny
- Start date
I was more thinking about the Yanks the Ozzies are still on their first attempt. I went to the launch of Astute it was nearly 5 years ago and from what I have been told its nowhere near ready. Is there not more of a reason thats already in the public domain than simply we're better? Im pretty sure my grandad told me the reason when I was little (he worked in vickers his entire career) but its to late to ask him again now.
On a purely practical basis the "foreplanes"(proper name in the RN) are much more useful when they are either under the water or near the surface when they are needed for diving and surfacing added to which there is plenty of other equipment such as masts in the fin(sometimes called the conning tower) and having the hydrailics for the planes in there too must be a nightmare for the Yanks.They must see a benefit but I can't think what it might be.I have noticed they have their fin fairly for'd on the hull so maybe it is something to do with that.
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From OPEN sources (so may be complete rubbish).
The USN preferred the fin (to them sail) position to allow a "larger force arm" by off-setting the axis of the fore- and aft-planes - this helped low speed manouvering.
The RN preferred hull mounted fore-planes for high speeds and under-ice operations.
The USN said they changed to the hull position for under-ice ops.
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From OPEN sources (so may be complete rubbish).
The USN preferred the fin (to them sail) position to allow a "larger force arm" by off-setting the axis of the fore- and aft-planes - this helped low speed manouvering.
The RN preferred hull mounted fore-planes for high speeds and under-ice operations.
The USN said they changed to the hull position for under-ice ops.
.
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I assume that foreplanes as they were on the diesel boats aren't so essential now that coming off the surface in a hurry must almost be a thing of the past in nucs.
Memories of A and O boats trimmed down on the surface completely under water in something like 45 seconds, if nothing else it kept you fit, either getting below or shutting down the diesels depending on your branch.
Memories of A and O boats trimmed down on the surface completely under water in something like 45 seconds, if nothing else it kept you fit, either getting below or shutting down the diesels depending on your branch.
On T boats the foreplanes are retractable, as they were on S boats, so we pull them in when alongside but the controls for it are a nightmare (as I can say from bitter experience). Foreplanes are only used at PD (periscope depth for the un-initiated), diving and surfacing, and are locked in the horizontal position when deep as depth control is all done using the aft planes.
Foreplanes can be retracted, but are a total pain in the arse, often requiring precise adjustment, or more accurately "percussion fettling" by experienced Wrecker Ms. They are however ineffective and tend to make a bit of a noise above a certain speed hence they tend to be locked and depth maintained by after planes only when fast and deep. I believe the same is true for astute class boats also.
Incdentally, ships divers have not been carried for a number of years, so that is a capability we are sadly lacking when deployed. If any specialist work is required, SMs have to call on the services of an RN diving unit now to come out and perform underwater engineering work, beyond the usual fitting of the sewage connection and bancock strainers. (astute class fortunately have a high level sewage discharge hull valve negating the need for divers whenever you come alongside or leave the wall)
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