Gorgeous screenshots Martyn!
Baz, the following is taken from Squadron/Signals Publication Aircraft Number 49 " Se.5a in Action"
"Only one true development of the S.E.5a was constructed. Known as the S.E.5b, it featured longer upper wings: 30 feet 6 inches with a chord of 6 feet; shorter lower wings: 26 feet 6 inches with a chord of 4 feet 3 inches. The interplane struts had a very pronounced outward rake. A large round spinner was fitted over a two bladed propellor that blended into a streamlined nose.
Powered by a 200 hp direct drive Aires Hispano-Suiza engine with an underslung radiator that swung backward and could be partially retracted, the S.E.5b's performance was found to be not as good as that of the S.E.5s. Unfortunately the larger upper wings created additional drag, negating the benefits of the streamlined nose and shorter lower wings.
When later fitted with the standard S.E.5a wings it's performance improved, but not by very much. The S.E.5b remained at Farnborough for a number of years where it was often flown experimentally."
The Publication also has a nice black and white picture of the S.E.5b, plus a thrre-plan drawing.
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