Hello Larry,
larry cottrill wrote:
The Vietnamese ... example appears to be a scale-up (...) of the basic Chinese engine.
The
website where the photograph was first found is Vietnamese; the
drone and the pulsejet are Chinese.
The enterprising young master James Irvine was able to "dig up the dirt" on the pulsejet and reports that
it pushes 196 N (44 lbf). Thunderchine's core pulsejet develops 30% more thrust
, in a much shorter length.
larry cottrill wrote:
I doubt that compactness is the Holy Grail for M that it is for me.
It would be more correct to say that I have
many grails. Compactness is certainly one of them. My "quest"
(haha) is to simultaneously optimise all of my "grails" (performance metrics), and these are legion (haha).
Thunderchine's off-forum successor,
Thunderhumper, develops the same thrust in a
25% smaller volume.
And for what it's worth
, my selecting for twin-intakes was a compromise between volume
and practicality.
larry cottrill wrote:
On valveless engines, sweetness is all in the details.
Now there is a statement that we can both agree on.
Cheers,
M.