Don,
I have had the best results from stabs of 50% to 42%. I have tried larger
stabs up to 70%. They seemed to work well at lower torque levels, but I couldn't
get them trimmed to handle the high torque levels required at Johnson City &
Kibbie dome. Maybe the tail booms were too floppy or too long, but I never
pursued it further. My CG is approx. 1.25" behind the wing trailing edge. My tail
booms range from 8.5" to 9.5" long. Within these ranges I have not been able
to measure any difference. It sounds like you need a better motor/prop
combination. What were the specifications of your motor & prop?
Even with repeated 1/4 motor tests, I find it difficult to measure
differences between two models because each wind of the motor produces different results
on the same model. For example, I have tried to winding a quarter motor to
80% of max winds & each flight produces a different time on the same plane.
Going from memory, the variation is 5 to 10 seconds. that is 20 to 40 seconds on a
full motor. I have also tried winding to the same torque each time with
similar results. This variation masks any difference between two similar models
with only slight design differences. I would love to hear how others try to sort
out the differences between two designs.
To add one more thought. I have used Bernie Hunts program to simulate &
compare designs. It has pointed me in the right direction, but at some point I
cannot duplicate the results it suggests.
Gary Hodson
In a message dated 3/18/2006 2:34:55 PM Central Standard Time,
ddeloach_at_adelphia.net writes:
What you think the optimum TMA and tail area are for A-6? I have only built
one and it has a 50% stab, appx 130% CG and did 8:52 at ETSU. Dead sticked
from 50 ft too. I am wondering what I can do to improve it.may shorten TMA
[Non-text portions of this message have been removed]
Received on Sat Mar 18 2006 - 13:18:05 CET
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