Okay, so today, I am going to fix this nozzle on my desk (dont have a camera so right now.... maybe some pics tonight on the lathe....)
I will post a drawing of specifications, but the L to the D ratio is "P00". and i want to make it better...
Plus if you have seen Charles Rogers info on nozzle efficiency, you can make a long L/D ratio strait cut nozzle better, by having less than a .303 ratio. and rounded entrance.
This means, that my nozzle, is too long... for the current expantion ratio. (dont know the half angle yet.)
here goes the first question...
Liner shoulder, is it required.. if so, why, if not why?
half angle, if it is at 15Deg, can it be reduced to 10deg, to allow a shorter throat.(i cannot make exit dameter any wider due to the trust ring, and flame plume being allowed to hit the exit of the case wall.)
i can notch the nozzle to get the same exit diameter further back .. and may do this to fit in a tad more propellant.