A couple of dimensions to add to the data bank, Clive/ Brian.
I was at Duxford a while ago and there are 2 J-58s under the Blackbird.
Someone thoughtfully displayed them with one nozzle fully closed and the other fully open.
Closed dia 33", open 45".
Who knows what they really are with the cooling layer. Maybe an inch less.
Or how they grow when hot.
Do let me know if you find the numbers useful at all. I suspect not as effective nozzle areas have to be calculated from other stuff.
Last edited by peter kent; 7th Oct 2013 at 19:48.
Reason: clarification