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Author Topic: LTV / Scaled Composites SOFTA (Special Ops Forces Transport Aircraft) proposals  (Read 22321 times)

Offline Skyblazer

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 MODEL 219 SINGLE ROTOR TAIL SITTER
 Single rotor, X-wing, tail sitter

The Model 219 addresses the problem of the complex counter-rotating rotor of the Model 217. By using four wings rather than two in the downwash and by using wing camber, adequate hover anti-torque can be provided by the fixed wing flying surfaces. Thus, the rotor becomes a single two- or three-blade constant speed prop rather than a complex counter rotating system that relies on relative collective pitch for yaw control in hover. The configuration has higher span loading and more wet» ted area than the Model 217, however. All six flying surfaces are pivoted at their roots for maximum control effectiveness. Two or four of the main wings may require adjustable camber for hover. This configuration would allow fore/aft and left/right translation while the aircraft axis remains vertical during hover operations by adjusting the relative wing positions.

Offline Skyblazer

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 MODEL 220 TWIN ROTOR TAIL SITTER
 Dual rotor, tail sitter

This configuration combines the simple wing configuration of Model 217 with the two rotor anti-torque shared disc-loading of the Model 218. As compared to the Model 218, the Model 220 provides improved hover pitch control and a reduced-complexity cross-shaft system.

Offline SteveO

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Wow, great posts. Thanks for sharing!

Offline Skyblazer

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 MODEL 222 LIFT FAN VSTOL
 Direct lift engine turbofan

In general, a direct lift fan configuration is unsatisfactory due to the high downwash velocities. This results in ground erosion and an inability to conduct ground operations in the downwash wake. The Model 222 configuration uses a single large cruise engine that can be vectored down for hover. Its lift is supplanted by four direct lift turbofan engines which are used only for transition and hover operations with the direct lift engines inclined outward, the split-nose loading is intended to provide protection for loading and unloading during ground operations with lift engines powered up. Blast deflectors near the main landing gear and fuselage nose provide protection of the high velocity ground wash to the loading and unloading crews. This configuration results in an extremely heavy powerplant installation. However, its long, efficient wing provides excellent cruise range.

Offline Skyblazer

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 MODEL 223 CAPSULE DELIVERY/RECOVERY SYSTEM
 Capsule-delivery/recovery turbofan

The Model 223 system, illustrated in two separate three-views, (one for delivery and one for recovery) shows a different approach to the basic problem of sneaking in and sneaking out unobserved. Instead of attempting to hover and infil with the entire aircraft and the return fuel. Only the payload is delivered to the landing zone. The payload delivery system is different from a standard airdrop scenario, however. A large (approximately 4 foot deep) airbag shock attenuation system allows the payload capsule with six passengers to be dropped at a sink rate of approximately 50 feet per second while limiting the impact accelerations to less than l2Gs. This can be further reduced to approximately 9Gs using stroking seats. The high sink rate delivery allows the capsule to be targeted with precision similar to the precision delivery of a smart bomb. Position designators or GPS is used to provide a landing area reference and the descent parachute is steerable in any lateral direction in order to position the payload into a small area. The “bomber” comprises its low observable shape only for the extraction, then can orbit undetected or return for refueling during ground operations of the infil crew. For recovery, the ground crew deploys a lanyard with a helium balloon, similar to the C-130 rescue system developed for the Vietnam era personnel recovery system. The mother ship picks up the payload lanyard and hauls it onboard for the high altitude stealthy cruise home. Thus, only the payload plus approximately 2,000 pounds is delivered to the high intensity area.

Offline Orionblamblam

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Yup, those are Rutan designs, all right.
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Offline GTX

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Wow, great posts. Thanks for sharing!


Ditto!

Offline Avimimus

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These are certainly some great finds! Thanks!

Offline hesham

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Great find Stargazer.

Offline AeroFranz

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I had never seen an analysis of alternatives from Scaled. This shows configurations that even they thought were too extreme, or at least were not downselected.
Top post, Stephane!  :)
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Offline flateric

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oh my...
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stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline Mat Parry

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Really fascinating!


Some creative solutions there,


Model 223, would seem to be the most likely to get you 1000 NM into denied airspace unobserved but bloody hell... that would be an uncomfortable ride. Been trying to decide which of the 6 seats in the capsule would be the worst (my money is on lying on your back with your head as the lowest part of your body. Please, no one show this to Ryan Air, it will give them ideas.


Model 220 remindes me a little of the Vought XF5U "Flying Flapjack"
« Last Edit: October 25, 2013, 01:41:15 pm by Mat Parry »

Offline Abraham Gubler

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Many thanks to Stephane and his "distinguished forum member" for digging this stuff up and making it public.
"There is a tendency in our planning to confuse the unfamiliar with the improbable." Thomas Schelling

Offline XP67_Moonbat

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In God we trust, all others we monitor. :-p

Offline Matej

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