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Advanced Medium STOL Transport (AMST) and its predecessors

taildragger

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That proposed version probably served to make a point about the versatility of a large airlifter, but would probably be worse than useless. Orbis and other NGOs fit out large aircraft in this manner, but they're typically used in non-crisis humanitarian projects, not the sort of disaster relief efforts that militaries are called on to support. Better just to have portable hospitals available that can be transported by a standard airlifter. Some of the minuses to a dedicated flying hospital:
- taking a $200M asset away from the task of flying in supplies to perform a role that can be done by a tent
- takes up ramp space that may be in short supply, limiting the delivery of supplies
- requires that casualties be brought to the nearest airfield. A tent can usually be set up much closer to the disaster area.
- the hospital's availability is tied to the aircraft so that if the aircraft is in for major maintenance, the hospital is closed. I don't think tent hospitals have to be regularly torn down for major maintenance.
 

MIRAGE 4000

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How many flight since 1997 for "new" YC-15 ?

Only one or much ?

Anybody knows ? Cant find information ??? :'( :'(
 

aim9xray

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They reportedly had an engine failure that would have taken company money to repair/replace. At about the same time, the battle for extended C-17 production (80 units under multi-year procurement) was won and the need for a C-17 surrogate diminished as the #1 C-17 would stay as a flight test asset and not go into the airlift fleet. (The merger between McDonnell Douglas and Boeing happened about the same time and may have also had something to do with the loss of interest in the YC15.)

The YC-15 was originally flown into Long Beach Airport (where it got the new paint job) and later sat at the Boeing (ex-Rockwell, ex-North American) Palmdale facility for about 10 years until it was towed overland to the Century Circle at Edwards.
 

taildragger

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The attached photos show a Lockheed AMST proposal model sold on eBay a few years ago.
 

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Caravellarella

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Dear Boys and Girls, I love the Boeing YC-14; reminds me of childhood and a high-tech future that didn't quite materialise......

Here'e a general arrangement drawing I found in my computer; I've got no idea where it came from......

Terry (Caravellarella)
 

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Stargazer2006

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Thanks Terry! I completely second that... YC-14 and YC-15 both together at Le Bourget in 1975 was a grand experience. The future of aviation sounded modern and promising... True, the C-17 is a fantastic aircraft, and is derived from the YC-15 in many ways... but Boeing's YC-14 will always have my preference for its incredible shape and innovating technology.
 

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CFE said:
The only replacement for a C-130 is another Herky Bird. It's a marvelous airplane, considering that it's been flying for almost 55 years with no real replacement in sight. It's the modern equivalent of the C-47.

While a jet-powered replacement like the YC-14 would offer some advantages like higher cruising speed, you can't beat the turboprops for fuel-efficient operation.

Or screw-deployed landing gear for rough field performance, etc. The Hercs got a lot going for it mechanically that you simply can't replace with widgets and technology.

It's also one of 3 military types that I've flown in (E3 is another!) so a fond place in my heart. I was on-board for some tactical go-rounds and palletised Jeep deployments from low level, wish I could have been on-board for a JATO take off :D Very exciting aircraft.
 

Caravellarella

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D'accord Stargazer2006, the YC-14 was just fantastic...... ;D

Terry (Caravellarella)
 

Triton

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Pioneer

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Hey great pics Triton - thanks
What would be great is some internal/cargo compartment photos of the YC-14 ;)
Was the inner dimensions of the YC-14 & YC-15 larger than that of the C-130, it was intended to replace?

Regards
Pioneer
 

AeroFranz

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Sorry for not providing the link, but I'm in a hurry- anyway, the flightglobal website has among the cutaways a drawing of the YC-15 and YC-14, with a visual comparison of the cargo bays of the two aircraft and the C-130.
Hope this helps! ;)
 

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AeroFranz

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Precisely - thanks for taking the time to retrieve the image, Triton. :)
 

flateric

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Yes, of course ;)
 

AeroFranz

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Pictures from AvWeek, first two are Lockheed concepts, and they are the same posted by Matej but with accompanying text (AvWeek).
Second set is from an advertisement and shows YC-14 in multiple roles, including tanker and cruise missile carrier!
 

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hesham

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Hi,

the Boeing 953-258 AMST aircraft.

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=AD756861&Location=U2&doc=GetTRDoc.pdf
 

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hesham

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Hi,

anther report to General Dynamics AMST.

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=AD766942&Location=U2&doc=GetTRDoc.pdf
 

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Stargazer2006

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Caravellarella said:
Here's a general arrangement drawing I found in my computer; I've got no idea where it came from......

You don't have to wonder any longer, Terry: it's from the French bi-monthly Aviation Magazine and was illustrated by J.-M. Pérard.

I'm enclosing a much better version so I guess you can delete the old one and mention this post instead.
 

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Deino

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Some nice pictures of the YC-15 ...

http://www.top81.cn/top81bbs/thread.php?cid=1&rootid=2930016&id=2930016

Deino
 

Pioneer

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Orionblamblam said:
Art of the Bell AMST prototype, which was obviously to be built from C-130 parts.

Thanks Orionblamblam for sharing this find!!
Never knew Bell submitted a design, let alone one as large as the AMST comp!!
I wonder what involvement Lockheed had in this proposal, as you have pointed out - the submissions heavy C-130 part usage. Or was Bell's submission a proposal of utilizing already existing USAF C-130's???

Regards
Pioneer
 

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McDonnell Douglas C-15 ICBM Air Launch. Painting by Mike Machat for MDC Public Relations (Courtesy Mike Machat).
 

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Triton

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Boeing YC-14 model manufactured by PacMin.

URL: http://cgi.ebay.com/Boeing-YC-14-Contractor-Model-1-100-scale-/180692003480?pt=LH_DefaultDomain_0&hash=item2a12152a98

Seller's description:
Very unusual Boeing Contractor Model. The Boeing YC-14 was a twin-engine STOL tactical transport. It was Boeing's entrant into the USAF's Advanced Medium STOL Transport (AMST) competition, which aimed to replace the C-130 Hercules as the USAF's standard STOL tactical transport. Although both the YC-14 and the competing McDonnell Douglas YC-15 were successful, neither aircraft entered production. The AMST project was ended in 1979 and replaced by the C-X program. This model is in wonderful condition and is made of some kind of resin, with slight shelf wear and no repairs or decal loss that i can see. There is no maker stamp or logo on the bottom of the wood base. The wingspan is 15.375" wide. I make that out to be 1/100 scale. NICE. The photos do NOT do this justice.
 

Triton

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Boeing YC-14 model manufactured by PacMin.
 

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Triton

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Boeing YC-14 model manufactured by PacMin.
 

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AeroFranz

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LowObservable said:
Takes me back, that does. RIP Foz, engineer and gentleman.



Would you believe that few engineers even know how to sketch like that anymore? What a shame.
I thought Coanda was Rumanian, however.
 

Pioneer

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Orionblamblam said:
Pioneer said:
Or was Bell's submission a proposal of utilizing already existing USAF C-130's???

The C-130 components were only to be used for the prototype. The production planes would be all-new.

Thanks mate!

Regards
Pioneer
 

flateric

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Ground vortex on YC-14
 

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Graham1973

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Possible (Unidentified) AMST Aircraft.

Kiyoshi Aoyagi, Michael D. Falarski & David G. Koenig, 'Wind-Tunnel Investigation of a large-scale 25º swept-wing jet transport model with an external blowing triple-slotted flap'

Abstract:

An investigation has been conducted to determine the aerodynamic characteristics of a large-scale subsonic jet transport model with an externally blown triple-slotted flap. The lift of the model was augmented by the turbofan engine exhaust impingement on the flap surface. The model had a 25 deg swept wing of aspect ratio 7.28 and four turbofan engines. The model was tested with two flap extents. One extended from 0.11 to 1.00 of the wing semispan, and the other extended from 0.11 to 0.75 of the wing semispan with a single-slotted aileron from 0.75 to 1.00 of the wing semispan. The results were obtained for several flap deflections with and without the horizontal tail at gross thrust coefficients from 0 to 4.0. Longitudinal and lateral data are presented with three and four engines operating.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740005608_1974005608.pdf
 

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Graham1973

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Another possible AMST Aircraft with four Upper Surface Blowing engines.

Kiyoshi Aoyagi, Michael D. Falarski & David G. Koenig, 'Wind Tunnel Investigation of a large-scale upper surface blown-flap model having four engines'

Abstract:

Investigations were conducted in the Ames 40- by 80-Foot Wind Tunnel to determine the aerodynamic characteristics of a large-scale subsonic jet transport model with an upper surface blown flap system. The model had a 25 deg swept wing of aspect ratio 7.28 and four turbofan engines. The lift of the flap system was augmented by turning the turbofan exhaust over the Coanda surface. Results were obtained for several flap deflections with several wing leading-edge configurations at jet momentum coefficients from 0 to 4.0. Three-component longitudinal data are presented with four engines operating. In addition, longitudinal and lateral data are presented with an engine out. The maximum lift and stall angle of the four engine model were lower than those obtained with a two engine model that was previously investigated. The addition of the outboard nacelles had an adverse effect on these values. Efforts to improve these values were successful. A maximum lift of 8.8 at an angle-of-attack of 27 deg was obtained with a jet thrust coefficient of 2 for the landing flap configuration.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750023943_1975023943.pdf
 

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