Can't help with your problem Jane, but I seem to remember reading that after visiting Lutterworth to see Whittle's first flight engine - as opposed to the rather horrible experimental engines - Stan Hooker told Lord Hives (Chairman Rolls-Royce circa '41-'42) that Whittle's jet produced 1000 lbs static thrust.
Hives was unimpressed, but asked Hooker how much thrust a
Merlin produced at 350mph. Hooker lit up his slide rule and did the calculations.
"About a 1000 lbs of thrust." He told the chairman. Suddenly Hives wanted to see a jet engine for himself.
Roger.