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Daemon's blog
Archive for June, 2012
Posted by Daemon | Jun 19, 2012 @ 02:07 AM | 8,419 Views
The build method described in my last post has proven itself extremely crash resistant but it's
heavy. I can't do anything major about that, but I made some minor changes which do help:
1. I dropped from 1/8" thick aircraft ply down to 3/32" and then covered it in a layer of 1.7oz Kevlar.
Stick it lightly to the wood with 3M 77 spray adhesive, and then thin CA to bond it. Works great.

2. I also dropped from 1/2" OD diameter dowels for the arms down to 7/16".

3. Built a lighter anti-vibe mount for the GoPro. The old one is aluminum plate with squishy
silicon-like donuts between. New one is just two layers of ply with 5 memory foam style
earplugs glued between them. It has proven very effective at killing jello inducing
vibes, even when I've beaten the props up and they're no longer balanced.

All told this reduced the weight by about 5oz.

I've also been battling flaky ESCs. I originally used cheap Hobbyking 18-20A ESCs and
they worked just fine. I cooked a few over time (mostly getting em wet) and had
to replace em. Problem is, the newer version of the exact same ESC (looks identical)
has different electronics/firmware, and it now uses auto-throttle calibration. This just
does not work for multirotors because any sudden high throttle maneuver can cause one
ESC's throttle range to extend while the others do not, and suddenly it acts like you've got
a full stick's worth of trim... Lots of crashes...Continue Reading