Correct - B.2 had 1. Our B.2s (A84-125 and A84-307) here in Oz were converted to T.21 trainers and retained what we called the "Avon Mk 1" with single cartridge. Similarly, our early B.20s were spec'd on the B.2 and had the single-cartridge Avon Mk 1 (aircraft A84-201 to A84-227).
The later B.20 production (A84-228 to A84-248) were spec'd on the B.6 and had the "Avon Mk 109" engine with the triple cartridge breech.
On a related matter, I saw B.20 A84-242 in the paint shop at RAAF Amberley on Tuesday. It was being primed in readiness for its Vietnam camouflage scheme for display in the base's Aircraft Heritage Centre.
Last edited by BBadanov; 12th Apr 2013 at 03:21.