EZB happiness (and a few more questions...)

From: Jeff Hood <jhood_at_hmcon.com>
Date: Fri, 09 Dec 2005 13:44:49 -0000

Thanks to all of the advice from everyone on here, I finally had a
good night with my EZB... I took the advice of the master, and went
to .040x9" Tan SS (from this summer) and immediately did 13+ on a test
flight... then I got out a loop of .038 3/02 that I had, made a 9"
loop, and launched at .07 with 1500 turns and did 17:09, landing with
240 turns... in the 20' ceiling gym that I fly in... not perfect,
but much better than before... I did a later flight at 16:33 with a
9.5" loop of .044 Tan, launched at .1, and the plane handled the
torque well, but I think that the increased weight made the descent
too fast... all were with the 12.5x25p prop from before... Guess it
is time to make a few more props (questions below...) and get some
good stuff so that I can make more motors...

Questions...

- When everyone talks about "flare", I'm assuming that it comes
primarily from the spar twisting to an increased pitch, not from the
blades... and not talking about the frontward (from the side...)
flare of the prop spar forward... Since I hit 20' in less than 1.5
min, I'm guessing that I don't have enough flare in the prop for that
site...

- Is it best to flare the prop with the spar, i.e. more flexible, or
to move the spar back further on the blade... I could move it back
another .15 or so to the very rear...

- My prop weighs .153g, which seems a bit heavy... I'm guessing by
the original MicroB article that I should shoot for .12g and that
should add some time...

- I was at 74 rpm for the flight... (1260/17) which seems to point to
more pitch to keep the rpm's down... and I'm guessing that 3 min to
the ceiling is about right...

Does the above sound correct for the next round of prop/flight
conditions...? I'm getting closer, I think...

Thanks again for all of the help...

JH
Received on Fri Dec 09 2005 - 05:45:15 CET