Re: Wind hard or not so hard? [1 Attachment]

From: Don Slusarczyk <don_at_slusarczyk.com>
Date: Sun, 17 Nov 2013 22:50:17 -0500

I typically only wind to max or near max only when necessary. If max
turns on a motor was 2000 and I wanted to take a test flight with say
1250 turns. I would not wind 2000 then back off 750 to have 1250 launch
turns, I just wind to 1250. As launch turns increase I then start
backing off to lower launch torque to control my climb based on previous
test flight results. Once I have my model trimmed and I have my flight
time goal set flight I then calc number of launch turns needed to get
what I want flight time wise then see if the motor will do it. .If my
motor needs too many backoff turns to keep from overclimbing the site
then I might change the motor or prop as I do not like backing off more
than ~100 turns on a model but sometimes at a contest you don't have
that luxury to do additional experimentation. Lots of backoff to me says
the combination is not correct but that is my flying style/preference.
I had lots of trouble out climbing the ceiling at USIC this year as my
flaring props were not flaring enough. I know on my one HLS flight I
backed off about 250 turns to try and stop the climb and yet retain
enough launch turns to do close to 40 minutes but at 14 minutes I was
still climbing and then hung. In all fairness it was my Johnson CIty
prop so consequently more backoff was need for the lower site. So for
next year I need to noodle out some new props so I can retain the turns
I was backing off. I do what makes sense to me but in the end all that
matters is the result on the stopwatch.

Don
Received on Sun Nov 17 2013 - 19:50:19 CET