Talk:Shin Meiwa US-1A

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Untitled

The boundary layer control system and turbine: didn't Martin already propose that idea for the P7M Submaster? Proposal was in the mid-fifties. —Morven 19:57, 25 Mar 2004 (UTC)

Hull Design

The looks more like the Martin P5M Marlin than the Grumman Albatross. AMCKen (talk) 05:20, 4 January 2013 (UTC)[reply]

Indeed—I found one source (a comment in an Air & Space article) that indicates Shin Meiwa had a P5M-2 Martin Marlin at their facility during the development. See also Back to flying boats Peter K. Sheerin 20:58, 6 July 2016 (UTC) — Preceding unsigned comment added by PetesGuide (talk • contribs)

Update: the video linked to in that comment is Super rare documentary on Shin-Meiwa PX-S flying boat!—the URL in the comment was broken. Peter K. Sheerin 21:01, 6 July 2016 (UTC) — Preceding unsigned comment added by PetesGuide (talk • contribs)

Turboprops blowing over wings for STOL lift, BLC and slats on tailplane.

The text said that the "exhaust from the turboprops is blown over the wings, providing extra lift". I believe what the editor meant to say was "the propwash from the turboprops". The engine exhaust are located underneath the engine nacelles, directed downwards. This provides a slight amount of lift, but far less than can be obtained from the propwash. If you were referring to a turbofan-powered STOL aircraft like the Boeing YC-14, it would be proper to say "the exhaust", but not for a turboprop. Here is an excellent image showing the way the US-1 utilizes the propwash over the wings to create lift:

http://fas.org/man/dod-101/sys/ac/row/us-1-3rd-1.jpg

And an excellent cutaway diagram which shows the location of the engine and lack of any kind of exhaust ports over the wings (although I believe this is simply a question of improper phrasing; I doubt whether the person who wrote that actually meant the exhaust of the turboprop.

http://aviadejavu.ru/Images6/AN/AN82-2/15-2.jpg

I'm glad to find this image, because I've been looking for a cutaway diagram of a US-1A for some time now. I also note going over the drawing that the tailplane and rudder are also provided with BLC ducts; I don't think the article mentioned that. Not only that, but the horizontal stabilizer is actually equipped with slats, and (in the first image) it shows that the elevators are actually deflected upwards when the BLC system is on, creating reverse camber, pushing the nose up and increasing AOA automatically to assist in low-speed flight. Notice in the cutaway illustration that the slats on the horizontal stab are actually on the underside of the leading edge, instead of the upper side as is usual for slats. In essence, it turns the stabilizer into an inverted wing, so there is no need for the pilot to apply rearward stick or trim, or to maintain his AOA manually. I believe these systems are quite unique, if not completely unique, and it's a shame they aren't discussed in the article (I imagine that these complex systems contributed to the high unit-cost mentioned in the article as well; the small number produced just multiplied the effect)..45Colt 15:27, 11 August 2015 (UTC)[reply]

Some interesting stuff you have found.

On the uniqueness(or not) of the stabilizer there is similar stuff here for Phantom and Buccaneer.

https://www.flightglobal.com/pdfarchive/view/1971/1971%20-%200061.html

Buccaneer - undersurface of tailplane leading edge is blown, analagous to underside slat p.59 controls. Also mentioned is fixed slat on Phantom tailplane. see 4th photo here

http://tailspintopics.blogspot.ca/2011/09/f-4-flapstabilizer-change.html cheersPieter1963 (talk) 19:36, 6 December 2015 (UTC)[reply]

Shin Meiwa or ShinMaywa ?

see https://en.wikipedia.org/wiki/ShinMaywa_US-2 - Why two different spellings for the same company? 80.151.9.187 (talk) —Preceding undated comment added 10:30, 11 June 2019 (UTC)[reply]

See ShinMaywa - according to our article, the company was rebranded thus changing the name.Nigel Ish (talk) 13:39, 11 June 2019 (UTC)[reply]