I just rewatched Coach Chuck's video on tying the knot. I like the hemostat. I have been using needle nose plyers. I find that pulling the knots tight abrades and nicks the rubber, even with lube. I am going to change my practice by adding a couple inches to each end of the rubber strip, clamping the hemostat at the desired loop length and tying the knots from the tag ends inward to the hemostat. Then cut the tag ends off a bit outside the knot. That way, abrasions will be on the tag ends outside the knot. I just had a motor explode at 85% and destroy the lower rotor on my helicopter. The break was about 1/16" in from the knot.
Keep working on knot tying technique. The knots I tie do not abrade the rubber. Lube more carefully before you tie. Lube both sides of each strip and cover entire rubber ends with lube. Doesn't need to be dripping, just well covered.
@@brianturnbull3875 When I lube the rubber before tying the knot, I get to watch the knot slowly untie itself. I was using 50% green soap and 50% glycerin. I found that diluting that to half strength with water kept the knot from untying. But when I would stretch the rubber, I could see notches in the corners. When I use my new technique, the notches are outside the knot, not in the working part.
See NFFS Resources for Students for SO. Under the "Flying" tab there is a downloadable max turns calculator. It's an Excel spreadsheet. For android phones, it works immediately. For Apple, download Google sheets to use it.
I just rewatched Coach Chuck's video on tying the knot. I like the hemostat. I have been using needle nose plyers. I find that pulling the knots tight abrades and nicks the rubber, even with lube. I am going to change my practice by adding a couple inches to each end of the rubber strip, clamping the hemostat at the desired loop length and tying the knots from the tag ends inward to the hemostat. Then cut the tag ends off a bit outside the knot. That way, abrasions will be on the tag ends outside the knot. I just had a motor explode at 85% and destroy the lower rotor on my helicopter. The break was about 1/16" in from the knot.
Keep working on knot tying technique. The knots I tie do not abrade the rubber. Lube more carefully before you tie. Lube both sides of each strip and cover entire rubber ends with lube. Doesn't need to be dripping, just well covered.
@@brianturnbull3875 When I lube the rubber before tying the knot, I get to watch the knot slowly untie itself. I was using 50% green soap and 50% glycerin. I found that diluting that to half strength with water kept the knot from untying. But when I would stretch the rubber, I could see notches in the corners. When I use my new technique, the notches are outside the knot, not in the working part.
@@aeromodeller1 I'll create a UA-cam "short" next week to show my knot tying method.
That's a great video, coach Brian. Where can I get the winder. Tried searching with little to no help.
where can I find the small attachment to the torque meter? I really liked it
As he says, you could use a large paperclip, or bend your own from steel wire.
how did you calculate the maximum torque for each motor?
How did you calculate the target turn for a band is 135? Thanks
See NFFS Resources for Students for SO. Under the "Flying" tab there is a downloadable max turns calculator. It's an Excel spreadsheet. For android phones, it works immediately. For Apple, download Google sheets to use it.
Do you know where I can find the calculator?
www.freeflight.org/science-olympiad/science-olympiad-resources/
NFFS website science Olympiad student resources page. Fifth bullet point on the "Flying" tab on this page