R. D. Starwalt
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  • Anderson, SC
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R. D. Starwalt's Groups

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

R. D. Starwalt replied to Drone newbie's discussion Fried motors issue...help needed
"Good point Darrell, thanks for providing another perspective. No doubt a total DJI system is 'rail like'. APM will get there, or close to it, after a few flights and tuning. I almost requested 'DN' to run the 'motors'…"
Aug 27
R. D. Starwalt commented on VGR-Systems's blog post New patented tilted coaxial VTOL
"Nice to see it fly, even if for a brief period. Your efforts at miniaturizing the coax control system looks simple. I suspect the accelerometers are the feedback for the positional variations of the coax assembly. Small encoders might be tough to…"
Aug 27
R. D. Starwalt replied to Drone newbie's discussion Fried motors issue...help needed
"It is unreasonable to think you can only input throttle and have the aircraft go only up. You cannot expect the aircraft to go up like on a rail. The reality of the air currents and your frame do not permit this. The aircraft *will* shift around in…"
Aug 26
R. D. Starwalt commented on R. D. Starwalt's photo

Possible Flipping Causes

"Has your quad *ever* flown correctly? Is the DX6i setup for your quad in 'Acro' on the model type? 'Heli' is incorrect and will not work. Confirm your motor directions and propellers HERE I am not sure if it is still…"
Aug 25
R. D. Starwalt replied to Drone newbie's discussion Fried motors issue...help needed
"Alt hold modes depend on the tolerance/sensitivity of the sensor used to determine/maintain the altitude. The quest for the perfect sensor continues and depending on the installation, noise can cause variation in position. As your battery depletes,…"
Aug 14
R. D. Starwalt commented on Ellison Chan's group DIYDrones - CNC Project
"I thought I might be able to shake the bush and have something fly out... ;) Good to hear from you RM! I have not given up at all and am happy to help/assist anyone interested in building a machine. The problem with this tech is the constant moving…"
Aug 13
R. D. Starwalt commented on Ellison Chan's group DIYDrones - CNC Project
"For those stumbling across/finding this group... My Momus project is sorta back on track after I got distracted with a change in position in my company, getting reaquainted with fixed wing aircraft, and all the other things living in this world…"
Aug 13
R. D. Starwalt replied to Drone newbie's discussion Fried motors issue...help needed
"I do not have a DJI drive system. Looking at their webpage regarding the ESC: This *may* imply the motors provide feedback to the ESC although looking at the motor picture (very nice motor BTW) I do not see any tach feedback line. If the ESC senses…"
Aug 12
R. D. Starwalt commented on R. D. Starwalt's photo

Possible Flipping Causes

"The weight of the battery should not be a problem unless the battery is at an extreme end of an arm. If central to the aircraft, it should be fine. Something else is incorrect if flipping. Keep looking. -=Doug"
Aug 4
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

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.
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…


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…


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…


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…


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


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!


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!


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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