Hi all,
I've been doing a lot of research on
Swallow recently for my forthcoming book on Wallis:
http://www.amazon.co.uk/Bouncing-Bomb-Man-Science-Barnes-Wallis/dp/1844255883/ref=sr_1_1?ie=UTF8&s=books&qid=1240313149&sr=8-1
So I hope I can answer some of the recent questions in this thread about
Swallow.
There were many versions of
Swallow which were taken to varying levels of development, from outline plans to flying models. Manned versions included a single-seater proof-of-concept research aircraft through bomber versions (including one to OR.339 which could have become TSR.2) to airliner versions including the one in the kit and an eight-engined double-deck airliner.
A fundamental concept of the
Swallow was that it had NO TAIL (to save weight and drag) and NO CONTROL SURFACES anywhere - the wings were in one single piece for strength, and the engine cluster was gimballed in three dimensions to act as rudder, ailerons and elevators. The one error in the Fantastic Plastic model is that it shows elevators on the rear of the wings (which some versions with fuselage-mounted engines did have, but not the wing-mounted engine versions) and also wingtip control surfaces (which no version ever had). If you get the model, fill these grooves in with putty!!!
That thing would not have survived the stoppage of one of its engines!
This is one of the main objections levelled at the design, both at the time and by modern aerodynamicists. In the swept configuration, the engines are so close to the centreline that an engine-out is not a problem. In the unswept configuration, it is potentially a big deal, but Wallis designed an automatic (mechanical) sensor which looked for equal thrust from both wings. If imbalance was detected, the engines on the working side were set to "toe-in" which reduced the thrust on that side and restored the thrust line to within a manageable region. This would have worked within half a second, before the pilot even spotted the engine-out. Wallis got a patent for this, but how well it would have worked in practice is anyone's guess!
Swallow would have had a nose-up landing attitude like
Concorde, and Wallis did occasionally use the
Concorde-type "droop nose", but usually went for the pop-up cockpit idea, either a rise-fall one like that seen on the model here, or one with the crew in tandem, which was hinged at the back and only rose up at the front. Some of the
Swallows (e.g. OR.339) had a conventional fixed or bubble cockpit, though this had aerodynamic disadvantages.
Some of the
Swallow designs are truly beautiful aircraft (even better than
Concorde), but I agree that the
Fireflash takes some beating ... Wallis never put the crew in the tail (usually he had no tail!) and didn't use nuclear power either!
Thunderbird 1 did have variable-geometry wings, but by 1964, VG was almost
de rigueur in aircraft design anyway.
Regards,
Iain M.