R. D. Starwalt
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  • Anderson, SC
  • United States
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R. D. Starwalt's Discussions

For $99, be a part of the growing 'Drone Industrial Complex'

Started this discussion. Last reply by Andre K. Jan 20, 2014. 1 Reply

With a name like this, who couldn't make millions in the growing drone business?…Continue

Tags: names, domain, ebay

Shame it is not April 1 -- All our FAA fears could be over with this idea

Started this discussion. Last reply by Gary McCray Dec 25, 2013. 5 Replies

I am amazed at the ingenuity of THIS device.MX-X1 FAA…Continue

Tags: scam

A More Simplified APM2.5.x 5V/Vcc Schematic

Started this discussion. Last reply by Hein du Plessis Jun 13, 2013. 5 Replies

Target Audience: Readers who do not have Eagle or are confused about using it.You Need: Basic electronic schematic reading abilityIt was time for an update and simplification!…Continue

Tags: Module, Power, Vcc, 5V

South Carolina UAV source needed - Columbia Area

Started this discussion. Last reply by R. D. Starwalt May 2, 2013. 1 Reply

A reporter in Columbia would like a contact person involved in this field. I do not live near Columbia and cannot provide good visuals for a news story. The reporter,…Continue

Tags: HR3514

 

R. D. Starwalt's Page

Latest Activity

Rupesh Joshi commented on R. D. Starwalt's photo
Thumbnail

Possible Flipping Causes

"Dear All Actually every thing ok with Quad. I checked all pre arm tests and after that I armed properly with DX6i transmitter. but when i am trying to fly with propellers copter flips randomly during lift off . I've tried fixing this problem…"
23 hours ago
R. D. Starwalt replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"I had heard about another problem with a level shifter. It was many months ago and  I cannot remember the symptoms. Keep at the effort. Your work will help someone else I am sure. Well done. -=Doug"
Jul 25
David replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Hello, I think I have tracked it down to a level shifter. Cut the track on the vcc side of the TXB0104 and and checked the pad of the 3.3 and the volts was 0 volts, so I soldered the new regulator in and connected usb got 3.3 volts happy…"
Jul 20
R. D. Starwalt replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"If the replacement regulator is not a low dropout type, it may only pass the Vcc input to the output. Can you breadboard one of the replacements and demonstrate it working to regulate 3.3V with Vcc input? Odd problem. -=Doug"
Jul 20
David replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Its a china one been a really good control till now. Right I have probed the pads and I am getting  1.5 Mega ohms, Seems OK to me. Checked all diodes and they are fine. "
Jul 19
R. D. Starwalt replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"The obvious answer is that a short exists on the board or outside it, between the two points. 1) Test with no connections/wiring to the APM (regulator still removed) 2) Meter on ohms setting and check the resistance between the input and output…"
Jul 18
David replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Hi Doug, Yes I am referring to the regulator. I get the 1.77 volts while the apm is first plugged in boot up. "REGULATOR IS REMOVED" for this test.  If I probe the board the input VCC  pad I get 4.86 Volts witch is right,…"
Jul 18
R. D. Starwalt replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"When you say 'out put pin' are you referring to the regulator pin or some other pin on the APM? I suspect if you can remove/replace this device, you know the pin-out of the device is not the same as the drawing representation. You are…"
Jul 17
David replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Just come back from a flight. Plugged in my apm 2.6 to download the logs, but cannot get it to connect, checked the 3.3 regulator and getting 4.8 volts on the out put pin so I removed it to replace with new one thought I would check the output on…"
Jul 11
R. D. Starwalt replied to Michael Haertel's discussion Large quadcopter is flipping over, but to different sides
"Log files should have the version of the firmware loaded on your aircraft. It will be/was in the early lines of the file. Sonar? Good luck with that. In general it is an exercise in noise analysis. In practice - well, only God can make a bat. They…"
Jun 12
R. D. Starwalt commented on Katrina Rosen's blog post Boeing patents drone recharge system
"For the engineers/managers of large companies (and yes Gary, you are correct 'little people' usually cannot afford the patent process) applying for patents is similar to 'publish or perish'. Often the staff are measured (read…"
Jun 9
R. D. Starwalt replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"The 3.3V circuit was not part of this original thread. Many builders/makers were having trouble understanding the connections and limitations of the 5V circuit - many, many of them. Therefore this thread was developed and I was lucky enough to have…"
Jun 9
sam replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Sure?. May i know the purpose of that 3.3v regulator. I read somewhere that xbees use very small current. Also found some schematics show xbees directly connected to Arduino."
Jun 8

3D Robotics
Philip replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"This 3.3v is not for external devices... You will break the APM if you do that :)"
Jun 8
sam replied to R. D. Starwalt's discussion APM2.5 5V/Vcc Schematic
"Hi every one. I am newbie to Arduino, APM and all this stuff. Are there any way to connect xbee directly to APM2.5.2? Can i use APM GPS port for it? I checked the schematics and seems ok. What is the purpose of 3.3v regulator in the APM2.5? It seems…"
Jun 8
R. D. Starwalt commented on Eugene Stark's blog post Hoovy the Future of Drone Advertising
"IT ≠ IQ multirotor + gadgets + code ≠ $(printer) -=Doug"
Jun 4

Profile Information

About Me:
Certifiable hobby nut regarding electronics, flying things, rolling things, and driving things. ARRL (KB4FEM), SARA (Amateur Radio Astronomy), BSEET (SC State 2010), SLSTP (1994), AMA (79169). I am a national support specialist for MRI systems - 36 years experience.
Please tell us a bit about your UAV interest
I am interested in amateur science applications of micro-aviation and the educational inspiration that interactive technology can provide to school kids.
Hometown:
Anderson, SC

R. D. Starwalt's Photos

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R. D. Starwalt's Blog

Guess what was seen at the NMAM in Muncie, IN?

Posted on April 19, 2014 at 10:30am 7 Comments

This week I visited the National Model Aviation Museum in Muncie, Indiana. If you have never been, put it on your short list of 'to-do' items - seriously. Just inside the main front door, to the right is a double set of doors, with glass windows, that lead into the Claude…

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Eweek 2013 Triple Tree Aerodrome -- What a great place almost in my backyard!

Posted on September 28, 2013 at 7:47pm 1 Comment

Why did I wait so long to go to Triple Tree Aerodrome? The facility is fantastic and literally a gem less than a hour from my house.

I brought my two Arducopter quads and spent a huge amount of time letting folk hold them, and pour over…

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The Instructables WBQ (Wide Body Quadrotor) has maiden flight!

Posted on August 26, 2013 at 7:44pm 5 Comments

Yes! Another APM 2.5 powered quadrotor took to the air in South Carolina. All that energy, time, effort and planning paid off this evening with the maiden flight of my entry into the DIY Drones sponsored Instructables Drone…

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Winners of the 2013 Instructables Drone Contest (sponsored by 3D Robotics and DIY Drones)

Posted on August 5, 2013 at 7:43am 2 Comments

It is old news to some folk but the 2013 Instructables Drone contest ended on July 15 and the winners were:

(Note: Author names are Instructable member names. Several are…

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Comment Wall (13 comments)

At 8:37am on May 13, 2012, Carl La France said…

Quit a project you have going!  I never seen one of them fly in real life. you are right into it.After a while it becomes an extension of your self "Good Job!

" Education"  begins the moment you are born and never ends ."" The shortest pencil is better than the longest memory" I was always a believer in the 3 book theory ! You read one book on a related subject by a particular Author you are a Clone ! You read a second book  on the same subject by another Author  you can see a difference !You read the third book on the same subject by a different Author  You can formulate your own Decisions ! The guy that wrote the first book doesn't know what he is talking about and if you only read one book you are a Clone.

Since I am from the "Old School "  I learn by mistake! I do every thing twice . I just get right into it doing it wrong the first time  which is good practice so I can do it right the second time ! have a good day

Carl

At 12:38pm on May 13, 2012, Carl La France said…

You have a lot of experience in RC I never seen mini servos before the Radian Pro  I got a special on regular size servos from planes from the past  We put everything inside back then and they flew well . I like the way you sketch things out taking advantage of the  space available my radio is a 6 Di by using one servo for the ailerons I free up the aux channel for the camera The work you do looks quality ! have a good day!

 Carl

At 7:15pm on May 17, 2012, Carl La France said…

R .D. go to my page and check out my posted photos ! I am going to try and get the wing together this week end . You are working with new to me technology On your Quadro rotor how do you sinc  each motor to run at the same rpm ? I t must be a pretty good balance to get it to hoover stationary it looks pretty big how far is it across ?when you are 20 feet away how can you tell the front from the back?have a good day!

Carl

At 9:00pm on May 18, 2012, Carl La France said…

R.D. I have a quad on my real flight simulator and I can't even begin to control it after looking at your pictures of the inside of the Nova  I like the way you routered out the foam and made a basket for the servos . pretty precision stuff. Impressive  you might be working to closer tolerances than me because of the stuff you want to put in and the room you have  available. I jigged up and laid up the ribs for the wing on my drone today  my buddy has a ping pong table in his garage that belongs to his son he never uses it it has become a work bench I screwed the jig to the table to keep the wing straight From the drawing to cutting the pieces to laying it up is quite a change  after looking at it full scale it is kind of "High aspect ratio "  There is a lot of pieces and it took all day I c/a ed my fingers together many times at one point  when I was about half done I thought  "Why am I doing this? I am old I should be sitting on a bench in a park some where enjoying the weather watching people walk their dog then pick their dogs crap up and put it in plastic bags!" I will get my son to take a picture of the wing over the weekend and Post You have a good day! Carl

At 2:05am on May 23, 2012, Carl La France said…

R.D Do you have any experience with pusher prop stall and spin recovery where the motor is right on the tail? I am concerned Gyroscopic procession might make it impossible to recover if I put the motor there  Thanks Carl

At 6:52pm on May 24, 2012, Carl La France said…

I didn't read any thing on it I was going from practice experience in a  large plane .Spin Recovery Verify ailerons are centered , opposite rudder to stop the spin elevator forward to break the stall  pull out of the ensuing dive altitude loss  150 to 700 feet depending on the skill of the pilot . I don't know about a rear engine plane ? Just guessing in a full scale drone like the raptor that is rear engine since they are not in the plane they probably need 500 feet to stop the spin and another 400 feet to pull out of the dive

My concern is if I build a rear engine
RC plane and I only have 100 feet of altitude and if it goes in to a spin if I would be able to pull out or would the torque from the motor make it impossible to fly out of it? and increase the spin rate? right now I am looking at all the options as to where to put the motor other than on the nose Thanks Carl

At 5:22pm on June 4, 2012, Carl La France said…

R.D. Thanks for your comment I have been including the drawings with my posts as I make them up If any body wanted to make their own they could I am inventing as I go along same as you with your Quadro rotor One of the reasons I have an aluminum tail With the Spirit glider I have  the tail broke nearly every time I flew it You have a great Day! Carl

At 7:39pm on June 21, 2012, Carl La France said…

R.D. I left a comment for Robert Pigeon on his comment wall with some pictures check it out he means well and is a good guy .I am rebuilding for the EDF wait till you see my next post next week!

At 7:03pm on July 10, 2012, Carl La France said…

Bam! and they walked away Thanks R.D,

At 11:15am on September 22, 2012, John Githens said…

Doug,  (I am still adjusting to the design of the DIY Drones site... not the best from my experience with wikis and blogs.)  Below is a reply to your comment. Not sure if you would have received an alert that I left one in the other location.

Thanks for the offer and the tip about keeping a log sheet. I bought this charger from progressiverc because of some favorable blog mentions (and they are conveniently located in the basement of a house a few miles away from our home). Based on meeting those guys, I have a high trust for their advice and products. Haven't looked at these pages. I am about to *carefully* charge my first lipos with a charging bag.

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