Various Bell tilt-rotor projects
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In response to a post a while back saying that some of the illustrations look like an LHX proposal, I am attaching two pictures of Bell's Tilt-Rotor proposal for LHX. Unfortunately, when it became apparent that a Tilt-Rotor (from Bell or from Boeing) would have easily outclassed a conventional rotorcraft, the Army changed the rules so as to effectively eliminate Tilt-Rotors.
Hope the pictures come through!
Hope the pictures come through!
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I have attached a picture of a Bell concept (Son of BAT) that was put together when the US Army asked the industry to show them what they could do as far as rapid production aircraft. Using composites and glue none the less. While I do not recall all of the details, I remember seeing a briefing where the fuselage came in two pieces (top and bottom), as did the wings. As far as I know the project never went further than the initial effort of design.
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Floating through old briefings I came across a couple of Bell designs. The first two are is a Pressurized V-22. It also appears to have a fixed wing , vice a turnable one for ship storage. It may be my imagination but the prop-rotors appear to be larger as well, leading me to believe that this was/is intended for a land based platform.
The third is obviously an attack TR. I think it was the final work on a Army project to do rapid assembly rotorcraft. That is however a guess on my part.
The third is obviously an attack TR. I think it was the final work on a Army project to do rapid assembly rotorcraft. That is however a guess on my part.
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I suspect that the one you (re)posted, which I know to be really nothing more than a academic drill for industry on composite construction, might draw heavily from the earlier attack tilt rotor. There are several differences that I think make them different design efforts. One has fixed engines that Bell stopped work on a while back while the others have the (now) trademark tilting nacelles. One is a single seat while the other is two, something that is not a simple as carving out some of the fuel tank in rotorcraft. So while I suspect their is a lineage between the two concepts, I think that they are different works. Perhaps someone else on the Forum could provide more info....
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Hi,
the V-22 Osprey variants;
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880007274_1988007274.pdf
the V-22 Osprey variants;
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880007274_1988007274.pdf
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hesham said:
An "SV-22" (see Hesham's first post yesterday was seriously considered early on for a number of reasons. Two of the big ones were to get the broad geographical coverage necessary to deal with the expected high speed subs under development by the Soviet Union prior to its collapse, especially when there was no CV around. The second concern was it may have been the only practical way to search for Typhoon and other SLBM subs operating under the ice
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Artist's impression of Bell D-223 vertical takeoff transport with four General Electric XT58 turbines 5-18-1956.
Sources:
http://www.aiaa.org/tc/vstol/unbuilt/
Sources:
http://www.aiaa.org/tc/vstol/unbuilt/
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Artist's impression of Bell D-246 medium transport convertiplane powered by four Lycoming T55-L-5 turbines 1-13-1960.
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Artist's impression of Bell D-252 VTOL transport aircraft with two T64 turbines. Entered into Tri-Service competition and designed to meet these requirements:
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
- Weight: 35,000 lbs.
- Payload: 4 tons
- Operating Radius: 200-300 miles
- Ferry Range: 2,200-2,600 miles
- Cruising Speed: 250-300 knots
- Maximum Speed: 300-400 knots
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Artist's impression of Bell Model 266 V/STOL transport circa 1966. Project funded in 1966 & 1967 via US Army Composite Aircraft Program.
Characteristics:
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
Characteristics:
- Power: Two General Electric T-64's which power three-bladed proprotors.
- Speed: 370 knots (686 km/h)
- Weight: 35,000 lbs. (15,875 kg.)
- Capacity: 25 seats
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Model of Bell D-270, a design study for a 60,000-lbs. proprotor, 6-5-1969.
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Artist's impression of Bell D-312-100, -45, -21 tilt rotor VTOL commercial transport 5-10-1974.
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Model of Bell D-321 tilt rotor conceptual design for the V/STOL-A (pre-R.F.Q. activity) 5-30-1978.
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
Source:
http://www.aiaa.org/tc/vstol/unbuilt/
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Hi,
here is two variants to both of those Bell Models;
Model 266 with tilt-rotor
Model 266 with folded tilt-rotor
Model 300-A1A with normal tail
Model 300-A2A (XV-15) with H-tail
http://books.google.com.eg/books?id=m0Jd3ZJhRcgC&pg=PA99&dq=Bell+DUCTED+ROTOR&hl=ar&ei=kVOwTJ_1CY-hOqvr-PsN&sa=X&oi=book_result&ct=result&resnum=17&ved=0CHwQ6AEwEA#v=onepage&q&f=true
here is two variants to both of those Bell Models;
Model 266 with tilt-rotor
Model 266 with folded tilt-rotor
Model 300-A1A with normal tail
Model 300-A2A (XV-15) with H-tail
http://books.google.com.eg/books?id=m0Jd3ZJhRcgC&pg=PA99&dq=Bell+DUCTED+ROTOR&hl=ar&ei=kVOwTJ_1CY-hOqvr-PsN&sa=X&oi=book_result&ct=result&resnum=17&ved=0CHwQ6AEwEA#v=onepage&q&f=true
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hesham said:
When the D266 didn't "fly" as a government-funded program, Bell initiated a scaled-down version as the Model 300 on IR&D funds. It was to be powered by two PT6s and resulted in the 25-foot diameter rotor and gearbox proposed for the Model 301 in response to the NASA/Army RFP for a Tilt Rotor Research Aircraft. The Model 301 was powered by two T53s to meet the one-engine-inoperative requirement and was designated XV-15.
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The Bell C100-F1B was a powered aerodynamic scale model of the Bell D270 tilt rotor aircraft.
Source: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19760011019_1976011019.pdf
Source: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19760011019_1976011019.pdf
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