Howard Gordon
  • San Luis Obispo
  • United States
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Latest Activity

zhao commented on Howard Gordon's photo
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coaxial-v9-800g

"So cool!"
Saturday
Christopher Vo commented on Howard Gordon's photo
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coaxial-v9-800g

"Isn't that a Surveyor SRV-1? Those were great products!"
Feb 26
Hansaka Perera commented on Howard Gordon's photo
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coaxial-v9-800g

"Do you have video on flying? "
Jan 23
Howard Gordon's photo was featured

coaxial-v9-800g

added simple 2.5mm RCF foam strip to act as prop shroud and duct. RCF is an extruded polystyrene that is similar to Depron but higher density. Initial tests show that the addition of the duct significantly enhances stability of the flyer
Jan 10
Kevin Brown replied to Howard Gordon's discussion blimp recommendation ?
"You have to remember that balloon helium is a mix.... just enough helium to lift a latex balloon. The welding supply gas has more lift unless you get the balloon mix and you should get you money back on the tank I use balloons for ham radio…"
Jul 30, 2012
Kevin Brown replied to Howard Gordon's discussion blimp recommendation ?
" First version rip stop nylon with carbon fiber fame version 2 Poly tubing and a seal-a-meal  The base is about done I will post some more when I get them together for test flights "
Jul 30, 2012
Daniel Nugent commented on Howard Gordon's blog post High school kids launch balloon 20-miles high and capture pictures
"haha are you serious. I did this alone with no adult supervision. All my work,money, and success. I'm a sophomore in high school.  "
Oct 25, 2011
Patrick Hammer commented on Howard Gordon's photo
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coaxial-v9-800g

"Where did you get your main motor? Looks very cool!"
Jul 21, 2011

Profile Information

Please tell us a bit about your UAV interest
www.surveyor.com
Hometown:
San Luis Obispo, California

Howard Gordon's Photos

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Howard Gordon's Blog

Fun with planes, parafoils and robots

Posted on May 14, 2010 at 9:30am 5 Comments

Snowflake is a collaboration between Naval Postgraduate School and University of Alabama at Huntsville to develop single and multiple autonomously guided parafoils. The project, described… Continue

Bat-teK video - cool highlight of some Surveyor technologies

Posted on December 3, 2009 at 10:30am 6 Comments



Bat-teK is a Carnegie Mellon + Lockheed Martin project that uses a lot of Surveyor's robotic technologies, including the YARB blimp, SVS stereo camera and SRV-1 robot, along with CMU's console and mapping applications. CMU gave us permission to post this… Continue

Xoie Claims $1 Million Lunar Lander Prize

Posted on November 4, 2009 at 5:24pm 2 Comments

This is beautiful -





Full story here -… Continue

Comment Wall (13 comments)

At 11:15pm on November 15, 2007, Lem said…
Hi Howard,
I should have guessed I would find you here.... !8-D
At 10:35pm on December 11, 2007, James Canova said…
Howard,

It looks like you are using a couple of APC propellers. How it your machine performing. I have measured some propeller performance data for APC props for electrics up to 16" I also have some software to match props, gearboxes, motors and battery packs.

James

James
At 11:43am on December 12, 2007, James Canova said…
Howard,

I think that I have a paper on coaxial propellers, I will try to dig it out today.

I'd be interested to compare results with you. I'll be travelling today so I will see if I can find the paper on coaxial propellers tonight.

James
At 9:42pm on December 12, 2007, James Canova said…
Howard,

I found the name of the paper on the coaxial propellers, unfortunately, I did not keep a copy of the document itself.

Here are the details:
'An Experimental Investigation of Low Speed Single and Dual Rotating Propellers', Ronald Helmut Lorenz, University of Toronto, MSc Thesis, Department of Aerospace Science and Engineering.

I believe that it can be obtained through the library at the following URL: http://cisti-icist.nrc-cnrc.gc.ca/main_e.html

If you would like me to prepare a report for any specific combinations of propeller, motor, cells, please go to my website www.flightsolver.com and select the link for 'database summary' which is grouped with two other links near the top of the page.

I believe your comment that the second propeller should have a higher pitch is correct. The difficulty is determining how much. Another question arises, ie, is it better to have a space between two coaxial propellers.

James
At 1:51pm on December 18, 2007, James Canova said…
Howard,

I searched through the ~1,900 presolved powertrains generated by the FlightSolver program. These powertrains are generated by the FlightSolver program according to minimum performance criteria and battery and motor current and voltage limits for use with airplanes.

The APC 12x8P and APC 12 x 6E are not in the database, but I have the APC 12 x 8E (tractor) propeller in the database.

I found a presolved powertrain with a APC 12x8E that reached about 4.7 grams/Watt at zero airspeed (ie in a hover). The thrust in a hover is 17 N and the powertrain mass is 0.37 kg (3.7N), so the powetrain can lift its own weight.

The current drawn by the motor in a hover is about 31 Amp which slightly exceeds the battery pack current limit of 30 Amp. Flight time is thus quite low, about 2 minutes.

The complete powertrain is as follows:
propeller: APC 12 x 8E
motor: AXI 2826/12
battery: FlightPower (UK) EVO20 1500 4S1P

I have the complete report generated by FlightSolver in pdf form. I can't figure out how to attach it to this email, however, I will figure it out and send it along in a separate email.

James
At 12:58pm on May 10, 2008, Harrison Jones said…
Commenting on your post in my forum topic:
What CAD Software did you use for your board? I'm using Eagle and it doesn't have the Sayno or the Fairchild and that's really annoying :(
At 7:45am on May 13, 2009, joris laarman said…
dear howard,
sorry to ask a question blunt like this but would this blimp be for sale?
jorislaarman@gmail.com
At 11:36am on September 14, 2009, Joern said…
Hi Howard,
did you make any progress with your sparse stereo? I was checking your page for some sample images.
I'm currently trying to implement something pretty similar. Eventually the algorithm is supposed to track features in consecutive frames from one camera but as it doesn't really come at additional efforts i'm currently using it to match features between the frames from a stereo pair.
My current approach is a fixed point implementation of the harris corner detector in connection with a sum of absolute difference matching of some neighborhood around detected features (though normalized cross correlation might be equally fast and more reliable). Though i'm currently using non rectified images (it takes forever to load the distortion tables onto the board) the first results look promising.
I would be glad to hear about your progress and ideas.

Joern
At 11:44am on September 14, 2009, Howard Gordon said…
Joern -

Yes, we are getting reasonable results with the sparse stereo search. Video from a very early version of firmware was captured here-
http://www.surveyor.com/cgi-bin/robot_journal.cgi/2009/07/26#224 and the firmware has improved quite a bit since. We are using a giant lookup table for rectification that is generated from polynomials, so there isn't much storage required.
At 11:45am on September 14, 2009, Howard Gordon said…
Just noticed Joris' question about the blimp availability. Yes - it can be ordered online - http://surveyor-corporation.stores.yahoo.net/yarobl.html

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