This is notepage of MembersPage/NolanGarth
Not really interresting for others than me, but anyway.....
Std. engine T4 - 2L 4 cyl. 110bhp.
Max. RPM: 6000
VE: 90%
L: 2
Pr1: 1,8
CFM = 2*6000*90*1,8 / 5660 = 343,5 = 24 lb/min @ 20deg and 981mB
Half that to each compressor: 12lb/min
According to maps inside 72% isle: 2x T3 trim 40:
50% flow is 6lb/min
20% flow is 2,4lb/min
Thus surge-problem...
T3 trim 45:
Inside 74% isle
Same surge-problem.
T3 trim 50:
Inside 75% isle
Again surge-problem.
Hmmm. maybe instead opt for a smaller T2 as problem apparently worsens with higher trim ?
more to come