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Hi Lascaris,Just go for a poppet valve design. It will have a greater frontal area, but aerodynamically, that it not really all that bad since proper streamlining can eliminate most of the penalty that might be associated with it.A more developed engine will also be able to provide more power at the same point in the timeline as the original, less developed one, further tilting the scales in favour of the less ambitious design.Having a poppet-valve Sabre available significantly earlier would make the contemporary Merlin the benchmark to compare it against, not the sleeve-valve Sabre one might have had one or two years later. Bigger bird in hand versus pigeon on the roof type of situation ...Regards,Henning (HoHun)
Hi Lascaris,
Just go for a poppet valve design. It will have a greater frontal area, but aerodynamically, that it not really all that bad since proper streamlining can eliminate most of the penalty that might be associated with it.
A more developed engine will also be able to provide more power at the same point in the timeline as the original, less developed one, further tilting the scales in favour of the less ambitious design.
Having a poppet-valve Sabre available significantly earlier would make the contemporary Merlin the benchmark to compare it against, not the sleeve-valve Sabre one might have had one or two years later. Bigger bird in hand versus pigeon on the roof type of situation ...
Regards,
Henning (HoHun)
