Marc Halcomb
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  • El Segundo, CA
  • United States
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Marc Halcomb posted a blog post

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…See More
Apr 21
Ravi commented on Marc Halcomb's blog post Ranger EX 757-3 (Auto Tune & Auto Trim)
"I use flaps at 60deg in full auto takeoff. I have never weighed it. buy my battery weight is 750 grams. I am using 16000mAh Li-Ion pack at 11.1V. The original motor is suited for 3S because of high KV."
Apr 9
Marc Halcomb commented on Marc Halcomb's blog post Ranger EX 757-3 (Auto Tune & Auto Trim)
"Thanks for the inputs!!  I have received several great tips from other users as well, again thanks for the details of your experience! Questions:  What flap setting for takeoff? What is your airframe weight at takeoff?   Mine turned…"
Apr 9
Ravi commented on Marc Halcomb's blog post Ranger EX 757-3 (Auto Tune & Auto Trim)
"thanx for posting those PID numbers. It is lot of effort to generate those numbers even with auto tune. I think you have to lower the FBM min air speed to a lower value otherwise you will have problem landing it in FBW mode. the throttle will not…"
Apr 9
Ravi commented on Marc Halcomb's blog post Ranger EX 757-3 (Auto Tune & Auto Trim)
"I have been flying ranger for quite sometime. I like it because of it's sturdy design and high landing gear. I fly it with pixhawk. very important observation is that you have to keep elevator at 4deg+ even at neutral RC elevator stick trim by…"
Apr 9
Marc Halcomb posted a blog post

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 characteristics.   Final PID's from "AUTOTUNE"…See More
Apr 8
Marc Halcomb commented on Marc Halcomb's blog post 3rd Flight of Ranger EX 757-3
"Takeoff weight of my Ranger EX 757-3 = 2700g Original Motor 3S battery: 20A full throttle 950g static thrust (10X5 prop)  E-flite Motor 3S battery: 22A full throttle 1325g static thrust (10X7 prop)  E-flite Motor 4S battery: 33A full…"
Mar 31
Marc Halcomb posted a blog post

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 helped (some) with the sluggish control responses.In addition, I found the control surface hinge lines to be far too stiff. (I cut relief sections to reduce…See More
Mar 31
Marc Halcomb posted photos
Mar 31
Marc Halcomb commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"I did both, I changed the motor first (E-flite Power 15) and flew with a 3S power pack, the performance was better but not great.  Then I changed from 3S 5100mah to 4S 5500mah and the performance is good, lots of power to climb and at…"
Mar 31
Ben Owen commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"Can you send me a link to the video? I cant seem to find it. Also did you switch to motor or just upgrade to 4s?"
Mar 31
Marc Halcomb commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"I just posted and update from my 3rd flight (with video clip of takeoff/landing), switching to a 4S power pack with the new motor have solved the underpowered problem!"
Mar 31
Ben Owen commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"Make sure you post some videos so i can see what a good flying ranger looks like. I'm one click from buying this replacement motor. I just don't know if 3s will work."
Feb 24
Marc Halcomb commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"Thanks for the input Ben.  After much searching, and some simulation I am switching to 4S batteries.  A static thrust test using 3s batteries and various propeller pitches produced results in the 1375g range for a 2700g aircraft.…"
Feb 23
Ben Owen commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"I tried stability takeoff with the higher max throttle and it worked well. I don't think I have enough stick time to use the word usually. I mainly keep it in stability to ensure when it crashes it crashes gear down. Because of the under…"
Feb 22
Marc Halcomb commented on Marc Halcomb's blog post Maiden Flight of Ranger EX 757-3
"I was finally able to complete the 2nd flight of my Ranger EX 757-3.  My expectations were high, the results were less than impressive.  After installation of a 450W motor, I expected to the current in the 40A range (Burst) for takeoff,…"
Feb 17

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Please tell us a bit about your UAV interest
fixed wing & quad UAV's
Hometown:
El Segundo

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Marc Halcomb's Blog

Ranger EX 757-3 Auto Mode Test

Posted on April 21, 2017 at 4:38pm 0 Comments

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…

Continue

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

Posted on April 8, 2017 at 1:00pm 4 Comments

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…

Continue

3rd Flight of Ranger EX 757-3

Posted on March 31, 2017 at 8:00am 1 Comment

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…
Continue

Maiden Flight of Ranger EX 757-3

Posted on February 10, 2017 at 8:30pm 15 Comments

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.

The GOOD:

  • 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…
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