Revboden
Ah measured results, pretty cool!
“if i upped the moisture content and distributed the pressure a bit, i bet I could get to 4".”
I’ll bet it would.
If one “exercised the wood” by bending back and forth a couple dozen times to just short of failure each way, each time (like I did by raising the amplitude), that it would “limber up” and go farther and farther on each stroke as it fatigued.
Ah measured results, pretty cool!
“if i upped the moisture content and distributed the pressure a bit, i bet I could get to 4".”
I’ll bet it would.
If one “exercised the wood” by bending back and forth a couple dozen times to just short of failure each way, each time (like I did by raising the amplitude), that it would “limber up” and go farther and farther on each stroke as it fatigued.
Tom, in post #272, I quoted you writing:
“Another sonic boom simulator (3 way system called "speakers from hell"
on "beyond 2000" TV show) had the displacement of an 8 foot by 12 foot piston
moving 18" peak to peak, the system could produce >132dB on the outside wall
of an old house from 3HZ to 5KHZ.
This is about 2 lb pressure acoustic pressure per sq ft and with a sine
wave at 3 HZ, made the middle of the wall move 8-10 inches in and out
and "house parts" frequently would fall off (I thought we broke the
house at one point when there was a loud crash from the crawl space so
we stopped "teasing" the house with the oscillator).”
To clarify, by 8-10 inches “in and out” do you mean 8-10 inches peak to peak, a 4 to 5 inch bow ?
Art
Art,
from post #315 "Cal, I am not sure that deflecting even a new 8 foot 2X4 + - 4 or 5 inches (8-10 inches peak to peak) at the center with distributed pressure in the thick dimension will make it snap, in the case of the house, I don’t know what was in the walls. "
cheers
rev.
from post #315 "Cal, I am not sure that deflecting even a new 8 foot 2X4 + - 4 or 5 inches (8-10 inches peak to peak) at the center with distributed pressure in the thick dimension will make it snap, in the case of the house, I don’t know what was in the walls. "
cheers
rev.
Right, that's what I thought Tom had meant, missed that line.
Your 2x4 test was more scientific than mine, good work !
Art
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