Greg Fletcher
  • Male
  • Gardner, IL
  • United States

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Greg Fletcher's Groups

Greg Fletcher's Discussions

Eagle files for APM 2.5?

Started this discussion. Last reply by Chris Anderson Aug 30, 2012. 3 Replies

latest java update and Arduino problem

Started this discussion. Last reply by Greg Fletcher Jul 4, 2012. 2 Replies

Happy's IMU test and APmega

Started this discussion. Last reply by Paul Mather Apr 15, 2011. 4 Replies


Greg Fletcher's Page

Latest Activity

Greg Fletcher commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"Probably real good for a efficient long endurance fixed wing, but not so much for a copter. While the energy density doubles, the maximum C rating is one fifth of the best copter batteries, only 2C. You would still be pushing C limits, but my 650…"
Jan 30
Greg Fletcher replied to Ray's discussion bad crash last Saturday - can someone here read logs and analyze ? in the group IRIS
"looks like it just got some bad oscillation. Maybe was riding on the edge for some time then'''' wooow instability. That's what I see."
Jan 23
Greg Fletcher replied to Felipe Rabat's discussion Vibration
"I had this happen to my copter after a benign modification. I have very well balanced props and they are checked on a Dubro balancer. I changed motor mount because I thought they would be more secure, but they added 20 g and extended the arm length.…"
Jan 22
Greg Fletcher replied to moriarty's discussion strange behaviour of pixhawk-request help to understand in the group PIXHAWK
"hello moriaty, I have just looked at some of your latest logs. Same critical problem exists, bad voltage to the pixhawk, excessive battery voltage drop from idle to flight. your power bad%20power.PNG power from my copter good%20voltage.PNG It is…"
Jan 22
Greg Fletcher replied to Oscar Renato's discussion How to make a boat for bathymetry?
"I doubt any one will volunteer to help you until you explain what you mean by "armed drones". I think we might have a language issue as that sounds to me like you were using a weaponized drone for photogammetry. If you don't have an…"
Jan 14
Greg Fletcher replied to Jon Turner's discussion pixhawk 2.1 with jeti spin pro 300 and tmotor u15 no spin up
"Wow, that will be a monster machine. Are you talking about a 200 lb. payload or gross vehicle weight? If you are talking 200 lb. payload it will be under powered. I figure your motors ,esc's, and 12 s battery for each motor will weigh ~ 100…"
Jan 14
Greg Fletcher replied to Doug Andriuk's discussion Why did the chute DEPLOY?
"I think he must have been using an independent trigger to fire the chute. Has nothing to do with the Pixhawk as it lost power and there is no output. He had a second battery for the chute ejection system so I assume he had one of these things. It…"
Jan 13
Greg Fletcher replied to Doug Andriuk's discussion Why did the chute DEPLOY?
"You had a brown out reset or a total failure of your power system. Other than that the copter was flying perfect, well tuned machine. You have to look at the power tab in the log viewer. As you can see the vcc is bouncing between ~4.2 to 4.7 volts.…"
Jan 10

Profile Information

About Me:
This field under construction
Please tell us a bit about your UAV interest
aerial photography and fpv video.
Gardner IL

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Comment Wall (5 comments)

At 1:54pm on May 7, 2012, Amilcar Lucas said…

Hi there Greg,

Yes, I'm still working on the camera stuff, but not as mutch as I would like.

The most recent version of the code is in the APM_Camera git branch.

It contains libraries to control the mount (AP_mount) and the camera (AP_Camera)

There is also some documentation on the wiki.

It would be nice to join efforts.

At 1:20pm on May 9, 2012, Amilcar Lucas said…

Hi Greg,

Yes please send me the files I will take a look at it.

At 1:41pm on June 3, 2012, Carl La France said…

Hey Greg Go to my page and look at my photos this is not my first experience with air foils

Thanks for the comment! You have a Great Day!

At 1:18am on June 12, 2012, Carl La France said…

Hey  Greg ! It hit me while I was sleeping tonight and woke me up ! Getting baby scale is an Excellent idea! not just to weigh the plane but if I get one that shows ounces and fraction of ounces I can weigh each item and figure it's moment before I put it in the plane and help figure the best spot for it from the COG + or - and keep the trimming ballast to a minimum. the rest of the plane will be foam  I have been looking at power plants and might do Something Novel ? I am aiming for  a take off weight of 4 1/2 to 5 pounds  if I get a power plant out of something 7 to 10 pounds it should be lots  Thanks! Have a Great Day!

At 10:59am on August 25, 2012, Shyam Balasubramanian said…

Hi Greg,

I read your posts that you have made a camera gimbal stabilizer. I work on Arduplane source code, with the APM-1 board, attaching 2 servo to work out solution for 2-axis stabilizer. It will be helpful if you could share your source so that I can have a look at it to get a better idea !


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