Quote:
Originally Posted by mondo
You have to take into account the state of the aircraft in the production runs. Series I aircraft from the first batch were all (apart from 2 aircraft) Sabre IIA powered, had the older tail structure and Hispano MkII's. The 2nd production run had Sabre IIA's, Hispano MkV's and some structural changes but some at the end of the run had IIB's. The 3rd and 4th runs all were uniform in there engine but the 3rd run had the Dehav prop and the 4th had the Rotol prop but both had IIB's. Remember also, all Sabre IIA's were upgraded (this was some small parts changes to the engine and supercharger) around this time to be in line with the current production run. Whats not ever clear is if Rotol props were retrofitted to older aircraft.
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I understand that Sabre IIAs were cleared for +9 and Sabre IIBs (appearing in the automn 1944 IIRC) for +11.
I have also seen it claimed that IIAs were converted to IIBs, but I don't think I have ever seen evidence of that. Have you seen any...?