That's grrreat news, Erik - congratulations!
A pulse-jet log mover -- who would have thought? Is this some sort of Swedish thrust measuring rig?
I would be interested in knowing how many running minutes these valves last for my records.Earlier I estimated
- fundamental (driving) resonant freq at 83.72 Hz ( ±5%), and
- your then valve (0.3mm thick) mode 1 vibration at 200.3 Hz
- resulting in an estimated dfr of 83.72/200.3 = 0.418
For Valve Glide ™
to occur, I suggested we need to get this as close as possible to 0.431.
Since then I "measured" your jet's fundamental from your very first video and it was 76 Hz
Using my spreadsheet of the "Barton formulation" for a valve thickness of 0.25 mm, I obtain a Mode 1 frequency of 167 Hz.
The new dfr computation using these revised parameters, is dfr
= 76/167 = 0.455
which differs by +5.59% from the requisite value of 0.431. These valves should still last a while.
There isn't much difference between 0.3 mm (0.01181 in) and 0.25 mm (0.00984 in), only 0.002" by my count, but what a difference it makes in your case.
Again, I'm very happy things worked out for you.
Now go "kick some butt" at the races with your Argus-ette