Moderator Comment by Chris Anderson on June 4, 2011 at 10:56pm

Cool application! Can you tell us a bit about your autopilot?

Comment by Pbreed on June 4, 2011 at 11:02pm

Here is a video from on board.

http://www.youtube.com/watch?v=X_1PpBMtGrA

 

All this was covered in some detail during development in 2008

unreasonablerocket.blogspot.com

 

 

Comment by Pbreed on June 4, 2011 at 11:11pm

The autopilot uses:

A microstrain IMU,

A Hemisphere Crescent OEM GPS at 10Hz,

A MaxStream Extend for telmetry,

A 2.4Ghz Sprecturm DSM-2 radio (as a module in a JR9303)

NetBurner MOD5282 for the CPU.

And a Futabl 601 (I may have the number wrong) gyro for the tail, thats presentl;y not working real well.

The main IMU loop runs at 75Hz.

All the code is written in C/C++

 

In its present form you can see a picture from today taken by Michael Clive out at the site.

 

 

 

 

Comment by Jiro Hattori on June 4, 2011 at 11:13pm

Very stable flying!  I found a real rocket on your blog, amazing activities.

Moderator Comment by Jack Crossfire on June 5, 2011 at 12:25am

RTK GPS makes a huge difference, especially for altitude.  Since 20 hours seems to be standard for these trips to FAR, it makes us wonder how bad the traffic is.

Developer Comment by Michael Oborne on June 5, 2011 at 3:49am

Paul, how was your gps setup? RTK? DGPS? and what sort of cost is involved in it.

Comment by Pbreed on June 5, 2011 at 5:05am

I had RTK GPS on the copter.

This flight was done with normal L1 GPS.

Developer Comment by Randy on June 5, 2011 at 5:03pm

Pbreed - how much did the Microstrain IMU cost?  From a quick search on google I see a range of $700~$1700 but it's not specific on which of the models.

Moderator Comment by Chris Anderson on June 5, 2011 at 5:21pm

And can you tell us which RTK GPS you used?

Developer Comment by Michael Oborne on June 5, 2011 at 5:37pm

Another question, What RTK base where you using, and i asume you where using the MaxStream to send the RTCM/CMR data. I have read a bit of your blog but didnt see any reference to this.

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