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maszyna/McZapkie
pwarszawski bb43f559e8 ESt3: spring preload, minimum stage, releaser time and AL2 timing
Corrections to the TNESt3 distributor, checked against the ESt3 data
and acceptance requirements (orange book tables 3-5, 3-7 and 3-9) and
discussed with youBy:

- The main control device settles at (control reservoir - pipe - 0.21)
  times the ratio instead of using a 0.05 bar offset. The 0.21 bar is the
  spring preload; without it the first stage came 0.2 bar of pipe drop
  too early. BVM is derived from the same offset, so a full service drop
  still gives MaxBP.
- When the valve brakes it gives at least the minimum stage of 0.28 bar
  (acceptance tests 12 and 22 require 0.25-0.30 bar); when the target
  drops to zero the cylinder vents completely.
- The automatic releaser vents the 15 l control reservoir from 5.0 to
  0.4 bar in about 23 s (test 27: 23 +/- 3 s) instead of 5.6 s.
- 12" cylinder fill nozzle dTN is 1.62, not 1.65 (typo).
- With the AL2 relay the impulse chamber is 1 l and the cylinder nozzles
  are scaled so that the fill and release times meet table 3-9; before,
  the AL2 timings had been set by eye.

On a valve test bench running the acceptance procedures, the number of
results out of tolerance drops from 77 to 40. The remaining ones need
parts that are not modelled yet (accelerator venting, ZP/ZS filling,
intermediate chamber).
2026-11-02 20:07:32 +01:00
..
2026-10-15 17:56:41 +02:00