Brad Hughey
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  • Conroe, TX
  • United States
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Brad Hughey's Groups

Brad Hughey's Discussions

The FAA, A Book Review, and Thoughts of Redundancy

Started Jul 18, 2012 0 Replies

I just finished an excellent read: Why Planes Crash, by David Soucie.Mr. Soucie is a former FAA accident investigator and otherwise has a very diverse background in aviation.  However, far from a…Continue

North Central Illinois (Rockford) Area Test Field Wanted

Started this discussion. Last reply by Gary McCray Jan 12, 2013. 19 Replies

My electric multicopter is 25 feet wide from propeller tip to tip.  Testing it in my driveway is no longer a viable option.  Mechanical and electrical failures have been eliminated, and now it's time…Continue

The Case for Large-Scale Electric Multicopters

Started this discussion. Last reply by Andreas Sep 23. 87 Replies

This discussion thread is a follow-on to several conversations I've had with people in the forums who are particularly interested in the aerodynamics of vertical take off and landing (VTOL)…Continue

Tags: cyclic, control, quadcopter, quadrotor, multicopter

Our Host's Alma Mater Calls Us Out

Started Mar 7, 2012 0 Replies

I don't know how many of you read The Economist, so I thought I'd share this link to an article that brags on our Fearless Leader and this very community.  In the global context of "perhaps things…Continue

 

Brad Hughey's Page

Latest Activity

Andreas replied to Brad Hughey's discussion The Case for Large-Scale Electric Multicopters
"Although  making a mechanically self stable multirotor  helps the flight controller to perform less corrections, a thing that would ultimately traduce in less load on the motors and a little more flight time. Thats the case of the s800 of…"
Sep 23
Brad Hughey replied to Kate's discussion Flight time vs. battery life
"Thank you, Gary.  You're too kind."
Jun 3
Brad Hughey replied to Kate's discussion Flight time vs. battery life
"Steady forward flight will yield better efficiency compared to hovering as far as energy consumption rate.  As others have stated, doing aerobatics will cause your power usage to increase.  I think the 2:1 maximum thrust to hover thrust…"
Jun 3
Brad Hughey replied to Kate's discussion Flight time vs. battery life
"I always say, use a calculator to know.  Understand the math and calculate it yourself to understand.  The whole lift thing is based on mass and acceleration of an air column.  What we end up with is a pound-feet per second of air…"
Jun 3
Brad Hughey replied to Kate's discussion Flight time vs. battery life
"Hi, Rob.  How've you been? Yep, hex is 6.  My bad.  But that means that the ideal power at each disk is less, so it would hover longer.  5.3 lbs / 6 =  .88 12" prop copter: square root of (.88 pound/2 * 0.00238 *…"
Jun 3
Brad Hughey replied to Kate's discussion Flight time vs. battery life
"First let's calculate ideal power (I'm converting the 2.4 Kg to Imperial units and assuming 1 pound per thrust unit to make it simpler).In the following equation, we the thrust of about a pound and divide it by the result of two times the…"
Jun 3
Brad Hughey replied to Scott Penrose's discussion Design for Wind - Size matters ?
"There is no debate about response; your position is that longer, heavier blades are easier to accelerate than short, light ones.  We are at an impasse. There is no debate about efficiency; it is well understood that (all other things being even…"
Jun 2
Brad Hughey replied to Scott Penrose's discussion Design for Wind - Size matters ?
"@James: Your position is based on your measurements of your own props.  There are a myriad of aerodynamics variables (not to mention potential for measurement errors) to consider when looking at a real-world application.  I know that Dr.…"
Jun 1
Brad Hughey replied to Scott Penrose's discussion Design for Wind - Size matters ?
"First off, let me apologize to Scott for thoroughly hijacking his topic into a classical mechanics physics discussion.  I will attempt to make a note relative to his original point of responsiveness and ask James to continue this elsewhere if…"
May 31
Brad Hughey replied to Scott Penrose's discussion Design for Wind - Size matters ?
"@James: You're correct in that there is no direct physical causal relationship between lateral air movement rates and downwash speeds relative to positional or attitudinal stability.  I was trying to craft a simple metaphor for what you…"
May 29
Brad Hughey replied to Scott Penrose's discussion Design for Wind - Size matters ?
"If I may proffer an opinion... Size doesn't matter.  Lifting surface loading in pounds per square foot (wing or disk) DOES.  As does control response time and thrust headroom.  (unless you want to start discussing relative…"
May 28
Brad Hughey replied to Corey's discussion Spectra Laminate Over EPO
"It is still a work in progress, and has been for a long time (the first field test was in October of 2004).  I should have mentioned that the blades are 23" long but the whole "prop" is 46" with an aluminum plate hub. …"
May 23
Brad Hughey replied to Corey's discussion Spectra Laminate Over EPO
"I'm doing that - carbon fiber over balsa, but not for the frame.  I used it for my original rotor blades 23"L X 2.25"W X .25"T using a standard Clark Y section.  Those were my first layups ever (about 80 blades in…"
May 22
Mike Eubanks replied to Brad Hughey's discussion The Case for Large-Scale Electric Multicopters
"Brad - Hi, and a huge thanks for all the great detail here!  Still planning to put your machine together this spring? Key question (if you care to disclose): what are you planning to use for rotors/props?  Have you had time to run any of…"
Jan 28
Gary McCray left a comment for Brad Hughey
"Hi Brad, I foolishly started a Blog about optimal Multicopter design and it has kind of gone ballistic. I consider you one of my main mentors in this area with your very solid grounding of the real issues and aerodynamics to which they are…"
Jan 25
Luc Maximilien replied to Brad Hughey's discussion The Case for Large-Scale Electric Multicopters
"Ducted fans are not efficient for multirotors, I do not see any differences if blades are exposed or not when something fall in to your head from above.As anyone ever thought to put any protection on blades of a small airplane ?The other stuff is…"
Jan 25

Profile Information

About Me:
I am a personal aviation entrepreneur dedicated to manned electric VTOL flight. An EE by education and early career, I was active in the data storage industry until recently, including authoring a couple articles for Storage magazine.
Please tell us a bit about your UAV interest
Eschew the "U". My interest is manufacturing electric VTOL personal aircraft for the mass (ATV) market. For a technical treatise, please see US Patent #7,699,260 - A Vertical Takeoff and Landing Aircraft Using a Redundant Array of Independent Rotors.
Hometown:
Chicago Suburbs

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Comment Wall (6 comments)

At 5:38pm on July 29, 2011, Julie Macfarlane said…

I have about 30 years experience as an EE and have all the neat tools  :)

Either thats a very small driveway or you are out of control  :)

Must be a blast to fly!

At 5:52pm on July 29, 2011, Brad Hughey said…

It's a full-sized (3-car garage) driveway and the eCopter has a 30 foot rotor array span.  I guess it might look like a model, but it's a single-passenger FAA Part 103-compliant (ultralight) human-carrying multi-rotor electric VTOL aircraft.  It will be a blast to fly, but there are some unique tribulations with ground-effect aerodynamics that I am very close to solving with the help of a little automation.  :-)

At 3:59pm on March 5, 2012,
T3
William Premerlani
said…

Hi Brad,

I am not sure what you mean by your question, "how fast is fast enough". Could you elaborate? If you are talking about sampling rate, tests that I have done show that 8000 samples/second is about right.

Bill

At 5:58pm on October 2, 2012, R. D. Starwalt said…

Methinks the same. Friends we are now.

-=Doug

At 7:24am on January 14, 2014, thomas lewis said…

This is a excellent platform to develop for a affordable and safe flying machine.I'm guessing you could use some of the same software and hardware,that was developed for the hobby,commercial multicopter market with a little tweeking.The design affords itself to,being able to fly on fewer than all the motors and a ballistic chute,making it,really safe .A slow,low altitude,affordable VTOL aircraft,I love it,good luck,I have no doubt you will succeed.Hopefully we will see more and more software,hardware being developed.

At 12:10pm on January 24, 2014, Gary McCray said…

Hi Brad, I foolishly started a Blog about optimal Multicopter design and it has kind of gone ballistic.

I consider you one of my main mentors in this area with your very solid grounding of the real issues and aerodynamics to which they are subject.

I'd very much appreciate it if you might take a look at the blog and possibly insert some of your own perspective.

http://diydrones.com/profiles/blogs/some-multicopter-design-thoughts

It could use a serious grounding and benefit from your insight.

Best Regards,

Gary

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