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Old May 18, 2012, 08:15 PM
Earl E Adobtr is offline
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USA, CA, Mountain View
Joined Dec 2008
619 Posts

Awhile back i posed the question whether increasing prop pitch had any effect on gain settings for the HFP board.

It turns out not much. But I learned a few things swapping props, esc's and motors that I'll pass on, for what it's worth.

First, this is a 26" XHex with 2814 Avroto motors and Turnigy Plush 30A esc's. This was not what I started with when I originally asked the question but this is what I ended up with to make it run right.

As far as props go, I started with the old standby APC 12x3.8. Turns out I lost about 4 clicks of gain with these but gained 2 amps of headroom per motor compared to the Gemfan 12x4.5 carbon blades. Switching to Gemfan 11x4.7 and sliding the motors in 2cm on the booms decreased stability dramatically.

Now the real surprise: I was originally running RC Timer 3536/11 motors with RC Timer 50 amp esc's. Swapping these out for the Avroto's and Plush's allowed me to triple my gain setting but I had to switch to 4S batteries to compensate for the slight decrease in power. I just happened to have Avrotos already soldered to the Plush esc's so I swapped them all out as a set. The RC Timer 3535/11's are a well known and well liked motor. I think the RC Timer ESC's were the issue causing the low gain problem.

So, after a full day, the bottom line is the hex is finally running at a decent 74 (setup client) gain @ 4160 grams. Whew!
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