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RCn_TRIM not working...please help

I have a plane setup with two elevators and I am trying to trim them. I change the trim on one channel and it changes the trim no problem, I change the trim on the other channel and it changes the trim on the same elevator. I cannot trim one of the e

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LOG of a very mysterious crash

Hello everyone:

Today I flew again my quadcopter after 6 months of getting new parts from another crash (also due to an undetermined cause) in January. 

The drone I flew today had new battery, new and better motors, better propellers, higher end ESCs,

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Starting a hexacopter

hi
i am planning to make a hexcopter and for that i would be needing the respected community help
I have shortlisted the following stuff
1. MOTORS
HobbyKing Donkey ST4010-820kv Brushless Motor

Specs:

RPM/v: 820kv
Dimensions: 51 x 23mm
Shaft: 6.0mm 
Voltage: 1

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EKF filter to use with altitude

Hi all,

I've recently started to learn about altitude hold using barometer and acceleration values. I've found simple kalman filters codes, but I've read that extended kalman filter is more usefull and precise for this kind of use.

I've read somethin

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apm 2.8 wont arm 4 beeps

dji450 blew an esc so replaced and didnt calibrate. drone would take off but started to have a little spin so brought it down. not hard. it fell over and that was about it. since then it will not arm.i have sonce recalibrated the esc's and motors see

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ASHTECH MB100 L1/L2 GPS + GLONASS

Hi, 

I have for sale an Ashtech MB100 GPS board. 

The board has the following configurations: 

MB100: L1/L2 GPS, raw data, DGPS Base & Rover, SBAS, 5Hz, PPS, External Event, Advanced Multipath Mitigation
Options: [N] [L] [E] [Y] [S] [P] [C]

20 Hz position

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Using custom sensors?

Is there a way to utilize custom sensors that APM does not support?

Either directly or indirectly, I need a way to know what the health of a gas engine (temperature, RPM, etc).

Here are some possible ways I can think of.

1) Interface Arduino with Pixhaw

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Backup flight computers?

So suppose the primary flight computer, a Pixhawk fails, unless there is a parachute or a backup system, that plane is going down and it might not end well. So, is there any way to setup a system for a drone with a backup flight computer such that if

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