Main testing was on the DA 150 on greeves pipes.
mej. 32x10 open header 5600 rpm
9" to 11" header 5800 to 5900 rpm best transition 10.5" header at 5800 rpm...
mej. 28.5x12 three blade same same same....
DA 50 on ES pipe.... mej 23x10 10,000 rpm or something like that

(just joking) 6800 i believe.... and deadly silent.
more importantly look at that beautiful test stand!!!!!