FRANCIS NELSON HENDERSON
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  • Charleston, SC
  • United States
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  • Andrew Tridgell
  • Emery c. Chandler

FRANCIS NELSON HENDERSON's Discussions

Learning and Using Lift/Drag

Started this discussion. Last reply by FRANCIS NELSON HENDERSON Jun 24, 2014. 1 Reply

 Learning and Using Airplane Lift/Drag by FRANCIS NELSON HENDERSON June 18, 2014 Plane autopilots are installed in new airplanes…Continue

Learning and Using Stall Speed

Started this discussion. Last reply by Jose.L.Jr Jun 10, 2014. 3 Replies

Stall Speed for ArduPlane: by FRANCIS NELSON HENDERSON June, 2014 Stall speed (Vs) is unknown at every new Ardupilot installation. …Continue

Tags: Speed, Stall

 

FRANCIS NELSON HENDERSON's Page

Latest Activity

Emery c. Chandler left a comment for FRANCIS NELSON HENDERSON
"so wow i did not kow it was an old model in a way, wow. thanks for the reply and info- iv been working on a model visually similar for a long time, but I currently lack the resources needed to cut the balsa. I appreciate the response! Fair flying…"
Nov 15, 2014
FRANCIS NELSON HENDERSON commented on Gerard Toonstra's blog post Redesigning multirotor ESC's
"Planes need ESC RPM & Power feedback too.  Plane autopilots need to know motor RPM and Power when flying the plane (takeoff-landing-cruise) and also when analyzing the air frame performance (Lift to drag ratio). The airplane cannot be…"
Oct 22, 2014
FRANCIS NELSON HENDERSON left a comment for Emery c. Chandler
"2013-12-22_BlueBird_Dimensions.pdf Hi Emery,  The model airplane you asked about is made of balsa with some Plywood hard points and epoxy-fiberglass skin strength added in the wing-motor-landing gear areas.  The fuselage construction is…"
Oct 19, 2014
FRANCIS NELSON HENDERSON posted photos
Aug 30, 2014
FRANCIS NELSON HENDERSON replied to Meet Shah's discussion "BAD compass health"
"I too had "Bad Compass Health" until I moved the telemetry wires away from running along the top of my Pixhawk.  Any wire carrying electric current produces a magnetic field circling it.  The more electric current the more…"
Jul 4, 2014
FRANCIS NELSON HENDERSON posted a status
"I want to make an automated flight, takeoff to landing, with my big old airplane. Simplify the build by porting code to Rowley Crossworks."
Jul 3, 2014
FRANCIS NELSON HENDERSON replied to FRANCIS NELSON HENDERSON's discussion Learning and Using Lift/Drag
"RPM feedback is available as pulses on an auxiliary line (white wire) from the Castle Creations Phoenix-Edge series of Electronic Speed controllers (50, 75, 100, 130, 200 amps).  The ESC toggles the AUX LINE at every electrical commutation.…"
Jun 24, 2014
FRANCIS NELSON HENDERSON posted a discussion

Learning and Using Lift/Drag

 Learning and Using Airplane Lift/Drag by FRANCIS NELSON HENDERSON June 18, 2014 Plane autopilots are installed in new airplanes without knowing best glide speed, best endurance speed, optimum cruise speed, top cruise speed, or even the stall speed.  This paper selects one of three possible in-flight methods from which the autopilot can learn the speed of maximum Lift/Drag (V(L/D)max ).  The proposed maneuver is a 1g straight and…See More
Jun 18, 2014
Jose.L.Jr replied to FRANCIS NELSON HENDERSON's discussion Learning and Using Stall Speed
"Thank you for share, rare article!"
Jun 10, 2014
FRANCIS NELSON HENDERSON replied to FRANCIS NELSON HENDERSON's discussion Learning and Using Stall Speed
"Thanks for your reply, Iskess.  Yes, my hope in writing "Learning and Using Stall Speed" is that the developers will see the paper, thereby possibly helping to simplify and improve arduplane."
Jun 6, 2014
iskess replied to FRANCIS NELSON HENDERSON's discussion Learning and Using Stall Speed
"Nice ground school lesson. Well presented. Some more could be done to develop a recommended procedure for determining stall speed specifically for Ardupilot. For best results, could the plane be in a mode that maintains altitude? Perhaps Tridge…"
Jun 5, 2014
FRANCIS NELSON HENDERSON posted a discussion

Learning and Using Stall Speed

Stall Speed for ArduPlane: by FRANCIS NELSON HENDERSON June, 2014 Stall speed (Vs) is unknown at every new Ardupilot installation.  Yet, the autopilot needs to know Vs in order to determine takeoff speed, minimum banked turn speeds, accelerated stall speeds, and landing speed.  Learning Vs can be automated by flying and recording a simple straight and level power off glide at a safe altitude until the aircraft stalls.  This paper…See More
Jun 5, 2014
FRANCIS NELSON HENDERSON commented on Michael Day's blog post Landing from Rally Points
"Since the landing approach must be made as slowly as possible, but yet with a safe margin of speed, the stall speed plays a big role in determining landing performance. The FAA mandates large airplanes must use an approach speed of not less than 30…"
Apr 24, 2014
FRANCIS NELSON HENDERSON replied to jfro's discussion Calibration accelerometer 7 compass
"Accelerometer calibration is independent of the GPS, however the compass learns the local magnetic "deviation" (needed for compass calibration) from information contained in the GPS satellite downlink.  The magnetic deviation gets…"
Apr 3, 2014
John Hestness commented on FRANCIS NELSON HENDERSON's blog post Suggestions inspired by Andrew Tridgell's "A peek into the future of ardupilot" post
"I enjoyed your comments and learned a few things, especially about the different processors."
Feb 7, 2014
FRANCIS NELSON HENDERSON posted a blog post

Suggestions inspired by Andrew Tridgell's "A peek into the future of ardupilot" post

It's amazing the contribution Andrew Tridgell is making. I love how the new version installations are automated on my APM 2.5.  I'm waiting for the next major upgrade (3 ?) before flying my big plane on the new Pixhawk.  The 32-bit STM32F427 Pixhawk processor with single precision FPU has the compute power to support the coming new features.Above is a link to my Mission Planner recording of the…See More
Feb 6, 2014

Profile Information

About Me:
I am a software engineer BA in Physics. See my former year 2000's hardware & software work towards an autopilot at the link below:
www.inertial-solutions.us
Please tell us a bit about your UAV interest
I want to fly my big old airplane (9' wingspan, 18 lbs) on autopilot from take off to landing.
Hometown:
Daniel Island, South Carolina USA

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Suggestions inspired by Andrew Tridgell's "A peek into the future of ardupilot" post

Posted on February 6, 2014 at 7:30pm 1 Comment

It's amazing the contribution Andrew Tridgell is making. I love how the new version installations are automated on my APM 2.5.  I'm waiting for the next major upgrade (3 ?) before flying my big plane on the new Pixhawk.  The 32-bit STM32F427 Pixhawk…

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Comment Wall (1 comment)

At 5:22pm on November 15, 2014, Emery c. Chandler said…

so wow i did not kow it was an old model in a way, wow. thanks for the reply and info- iv been working on a model visually similar for a long time, but I currently lack the resources needed to cut the balsa. I appreciate the response!

Fair flying friend!

Emery C.

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