Marc Halcomb's Blog (6)

Ranger EX 757-3 Auto Mode Test

Completed a successful "Auto Mode" test today using a simple rectangular circuit.  From the "CTUN" graph you can see the roll and pitch response matches the demand.  The aircraft flew stable and as expected, I also repeated this test using 2 different altitudes verifying throttle, airspeed, and rate of climb in "Auto Mode" as well.  Finally, everything is coming together for…


Added by Marc Halcomb on April 21, 2017 at 4:38pm — No Comments

Ranger EX 757-3 (Auto Tune & Auto Trim)

I finally completed "AUTOTUNE" and "AUTOTRIM" activities on my Ranger, after fixing a self-induced configuration mistake.  Once "AUTOTUNE" was completed, FBWA mode flights were stable and responsive, ready to test an "AUTO" mode mission next.  Once "AUTOTRIM" was complete I ended up with a nice "MANUAL" mode trim and stable flying…


Added by Marc Halcomb on April 8, 2017 at 1:00pm — 4 Comments

3rd Flight of Ranger EX 757-3

Finally had the time for the next flight.  I increased the Roll and Pitch gain settings as the first two flights were quite sluggish to control inputs.  I was hoping to complete the "Manual" mode trim setup this flight but I continue to have too much starboard roll for the trim setting on the controller.  

  • The gain setting increases…

Added by Marc Halcomb on March 31, 2017 at 8:00am — 1 Comment

Maiden Flight of Ranger EX 757-3

I completed the maiden flight of my Ranger EX 757-3 today, with mixed results.  The flying weight today was 6lbs, using a standard rule of thumb, the power requirements would be 450 - 600W.  The supplied 3715/1000KV outrunner brushless motor only provides 300W.


  • Initial parameter selection flew the aircraft safely and successfully in Manual and FBWA! 
  • The build was good (no bits flew off)!
  • All the systems checked…

Added by Marc Halcomb on February 10, 2017 at 8:30pm — 15 Comments

Ranger EX 757-3

Update:  The local weather is improving and looks like tomorrow will be the maiden flight, really looking forward to its first flight.  The field I have selected is grass, and I have increased the main gear size to 4.5", which I…


Added by Marc Halcomb on January 24, 2017 at 11:50am — No Comments

Initial Parameter Settings

For my maiden flight, takeoff and initial tests will be in the FBWA mode.  Followed by switching between FBWA and Manual to get the trim correct. 

Initial Parameter Settings:

Some basic gain/dampening factors for the first flight, except for…


Added by Marc Halcomb on January 24, 2017 at 11:00am — 2 Comments


Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Vertical Horizontal one, is here

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