Hello Larry -- Thank you for the kind words!
( your check is in the mail
)
larry cottrill wrote:The tailcone as a whole is highly efficient.
I have to assume that you meant to write "tailpipe", as the tailpipe has
four (4) distinct cones:
[1] tail couple (length = 91 mm)
[2] entry cone (length = 217 mm)
[3] super cone (length = 420 mm)
[4] exit cone (length = 203 mm)
Am I right? Or by "tailcone", do you mean the "exit cone"? The ambiguity continues throughout.
larry cottrill wrote:
Outside air intake at the tail during the "breathing" phase of the cycle manages
to form a cool air slug that occupies almost 1/4 of the length of the cone.
Again, do you mean 1/4 the length of the tailpipe, or the exit cone? This would only be 51 mm.
larry cottrill wrote:
(even without the way cool augmentor) this is a FAR better engine to build than a Lockwood...
Thank you! We hope so!
larry cottrill wrote:
The only thing I see "missing" from an engineering standpoint (at this time)
is a decent set of tuned vibration-damping engine mounts.
Given the wide variety of possible mounting situations
, it was best to leave this to the builder;
however, as you may have noticed, the plans promote
this website as a source of information.
So, Larry ... Have at it!
It is noted here that while the fundamental resonance frequency of this pulsejet is ca.
160 Hz,
the great majority of acoustic power developed is radiated from the upper harmonics (ca
. 320,
480, 800 Hz).
Peak radiated power will
shift between F2 and F3 in response to thermal output.
These harmonics are a tad high for significant coupling into more likely mounts, eg., go-karts.
Edit: the previous sentence means "higher frequencies are less prone to mechanical coupling
than lower ones"; the Lockwood-Hiller 55 lbf pulsejet runs at a much lower frequency than
Thunderchine and radiates strongly around its fundamental frequency. Thunderchine was
designed (in part) to mitigate this vibration problem. I apologise for any ambiguity. -- M.
That said
, I would not want to stand anywhere near the
business end of one of these beasties!
Cheers!
M.