"What is the motor doing during this time? Are you maybe just expecting it to come down faster than the airframes sink rate? There is no way my SkyWalker will drop 100 feet in 10 seconds at normal gliding airspeed unless I deploy flaps.…"
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Doug Weibel
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- Longmont, CO
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Doug Weibel's Groups
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ArduCopter (traditional …
180 members
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ArduPlane User Group
677 members
Doug Weibel's Discussions
Lots of boards for sale
Started this discussion. Last reply by Doug Weibel Nov 19, 2012. 2 Replies 0 Likes
APMega - 1.0.1 alpha now in the repository
Started this discussion. Last reply by Uwe Gartmann Aug 16, 2010. 19 Replies 0 Likes
Doug Weibel's Page
Latest Activity
DeveloperDoug Weibel replied to Luke Horwood's discussion Auto-Landing Glide Slope in the group ArduPlane User Group
DeveloperDoug Weibel replied to Ashur Gelyana's discussion Battery Readings
"This is documented in the wiki - http://code.google.com/p/ardupilot-mega/wiki/Voltage
If you are running high voltage you may need to wire a custom voltage divider. Otherwise it should be fairly plug and play."
DeveloperDoug Weibel replied to Zafer Öznalbant's discussion Thrust Control
"If you are using the airspeed sensor, then the throttle is used for altiude control. Techinically, it is used for total energy control, but you can think of it as altitude control. Nominal airspeed is set as a parameter."
DeveloperDoug Weibel replied to Kevin Jones's discussion FBW-A lethargic
"Kevin - you have something wrong. There should be no problem with finding a gain set that is fine for both stabilize and FBW. Keep looking at it.
Check that you don't have a unit/scaling issue with your bank angle limit. I…"
DeveloperDoug Weibel replied to Ashur Gelyana's discussion Integrating Battery readings
"If you have a current sensor set up then this is already done. Set the parameter for the (usable) capacity of your battery and Planner will show a % remaining based on the integrated current useage. For example if you have a 2200 mAh…"
DeveloperDoug Weibel replied to RPF's discussion APM 2.5 - Ailerons are moving the rudder
"Set the rudder mix parameter to zero. If the behavior you are seeing goes away with that set to zero then the behavior you are seeing is normal."
DeveloperDoug Weibel commented on R_Lefebvre's blog post Potentially The Ultimate Compact GCS
"@Kevin - Thanks
@R - Its not when you are flying that it is a hassle, its when you are not flying. Throttle is constantly at mid stick unless you are holding it necessitating having some separate motor arming mechanism. Even then,…"
DeveloperDoug Weibel commented on R_Lefebvre's blog post Potentially The Ultimate Compact GCS
"Viewing angle doesn't seem like too big a problem but at 222 cd/m2 brightness, this is going to be pretty disappointing outside. Too bad, as the form factor is great.
Kevin - If you proceed with this here is a big…"
DeveloperDoug Weibel replied to Michael Bojsen's discussion Cheap variometer
"Pair of 3DR radio knockoffs from RCTimer = $40
Pair of Arduino Pro from Karlsson Robotis = $30
MS5611 breakout from Ebay = $20
Some homebrew speaker/amplifier = $10
That is $100 (plus shipping)
I think the cheapest route would be is you have a…"
Eduardo Romero commented on Doug Weibel's blog post APM automatic flap deployment ready for testing."Great thanks! "
DeveloperDoug Weibel commented on Doug Weibel's blog post APM automatic flap deployment ready for testing.
"Meters/second. And I believe it must be an integer value."
Eduardo Romero commented on Doug Weibel's blog post APM automatic flap deployment ready for testing."What are the units for flap_1_speed? cm/s or m/s?"
DeveloperDoug Weibel replied to Bret C's discussion Airplane/APM flies RTL regardless of mode setting in AUTO or RTL
"Hi Bret,
The mission you posted looks OK. Basically a mission must have at least 1 navigation command (TO, WP, loiter or land). I prefer to end all missions with an unlimited loiter or a land command. If you do not then after the…"
DeveloperDoug Weibel replied to Derek's discussion Pseudorange from Ardupilot and uBlox LEA6
"Derek,
Only the 6T and 6P modules produce the RAW data packets.
Check my blog post here for some work I did with raw carrier phase data from a 6T…"
DeveloperDoug Weibel replied to Bret C's discussion Airplane/APM flies RTL regardless of mode setting in AUTO or RTL
"Bret, you may have a problem with loading the mission to APM. If you switch to Auto and there are no valid navigation commands in the mission in APM, then it will switch to RTL. Load a mission and then clear the mission in Planner and…"
Philip commented on Doug Weibel's blog post APM automatic flap deployment ready for testing."Thanks for that, that now makes sense :) will try it today, I am being extra careful on this UAV as my last one only lasted 5 seconds after the dodgy HK AIO board failed after takeoff. Running genuine hardware and latest firmware now :)"
Profile Information
- About Me:
- Full scale plane and sailplane pilot
RC heli pilot
Ex-engineer, tinkerer
Doug Weibel's Photos
Doug Weibel's Videos
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FTDI2_2
Added by Doug Weibel 8 Comments 0 Likes
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Doug Weibel's Blog
Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
Posted on December 2, 2012 at 5:30pm 22 Comments 20 Likes
When the ublox 6 series modules were released, I noted that the 6T and 6P modules provided access to the raw carrier phase measurements, and I started thinking about how to use this capability. My connections through my university research appointment weren't strong enough to get ublox to sample a dev kit to me (they generally don't sample them at all). Jordi and Chris from 3DRobotics.com were kind enough to use…
ContinueAnnual Public Service Announcement
Posted on October 19, 2012 at 4:28pm 1 Comment 5 Likes
It is that time of the year when for many of us the furnaces have been turned on for the coming winter and the indoor air is getting dry, so it must be time for my annual ESD Public Service Announcement.
What is ESD? Electrostatic Discharge! That little spark you sometimes get when you touch a…
ContinueLemon-RX UART and PPM output
Posted on October 19, 2012 at 4:17pm 1 Comment 0 Likes
I have had a Lemon-RX (previously known as Orange-RX) DSM2 6-Channel Receiver (PPM + UART)
sitting around for a bit, and finally got around to hooking it up to my logic analyzer and checking it out today. I was interested in this RX as an inexpensive option if you need PPM output and run Spektrum/JR gear. I knew from the spec sheet that the channel resolution on…
ContinueBest Quads doing stuff video
Posted on March 21, 2012 at 10:00am 2 Comments 1 Like
In response to Chris' post of the best AP video ever, I have this offering
Difficulty with using Ultrasonic Ranging (Sonar) for landing flare control.
Posted on January 29, 2012 at 1:30pm 51 Comments 4 Likes
A feature frequently requested is to add support to ArduPlane for using sonar to control the landing flare.The answer, unfortunately, is probably no. Take a look at this graph I obtained yesterday...
This has been on my to-do list for ages as I have never gotten around to getting some real world…
ContinueComment Wall (13 comments)
- At 8:57am on October 22, 2009,
Greg Gibbons said… - Doug, please send your debugged IMU code, and let me know what to fix in Labview, I have 8.6 Pro Dev Suite. I noticed your in Longmont, I live in Windsor CO. We should get together and fly, I have been developing an autopilot and Ground control station for about 5 years.
Thanks
greggibbons@comcast.net
Greg Gibbons
- At 4:08pm on October 22, 2009,
automatik said… - Hi Doug,
I would like a copy of revised ArduIMU code. I'll add you as a friend here in order to send you my emaill addy....As for LabVIEW code, i think there was a mixup between Z and indicators (if memory serves me right) and I remember seeing one more thing...
- At 8:13pm on October 22, 2009,
Dan Wilson said… - Doug,
I would like to have a look at your IMU code.
Do your subtle changes greatly affect performance?
I have recently been flight testing the algorithm in my own application. With Jordis gains I noticed pitch estimate problems at full throttle due to what I assume was engine vibration affecting the accelerometers. I turned down the gains to about 30% what they were and it seems to have remedied the problem.
Dan
dan.wilson00@gmail.com
- At 3:25pm on December 4, 2009,
William Premerlani said… - Hi Doug,
You asked:
"Hi Bill,
We (some of us in the ArduIMU community) are having a friendly disagreement over what positive acceleration means relative to a reference frame. I'm afraid none of us may know the correct convention. If you have an IMU sitting on your desk and you begin to move it in the positive X coordinate direction, while you are accelerating it is that a positive or negative acceleration from the IMU’s perspective?"
The short answer is that many accelerometers, such as the MMA7260 that I use in the UAV DevBoard, actually measure gravity MINUS acceleration. So, in the case that you cite, the acceleration is positive, so the accelerometer will give you a negative output.
Best regards,
Bill
- At 4:18pm on December 7, 2009,
Danilo Marques Figueiredo said… - Hi Doug,
Did your arduIMU works fine with your ardupilot?!
My project is walking and I'm thinking to replace the thermopiles with arduIMU, Is it complicated to do it?!
Regards,
Danilo.
- At 10:52pm on December 7, 2009,
ModeratorGary Mortimer said… - Hey Doug messaging is down so I shall have to try here, unfortunately there's lots of rip off's of the original Vtail, if its from the USA that's what it will be. There are flat spars in the original about 6mm wide that are placed in the slot that runs on the underside of the wing for that purpose, also the from of the fins also receive the same treatment thats to stop them flexing. For hinging simply use some UHUpor and run two beads of it on each surface wait for it to dry and then bring together. Works really well. Please don't hesitate to ask any more questions, although as I say most being sold in the USA are not from the designer sadly!! Hooray for China, actually another country in this case, but the less said!
- At 7:56am on December 17, 2009,
john bero said… - Yes, it has four flights on it. It was a challenge to keep it under 6#. Came in @ 6.01#.
The first flight was good, had issues with take-off due to the high location of the motor and poor angle of attack with the wing. Even with this it performed quite well. Have a video of first flight. It is a heavy plane for its size; however it is very stable after the two issues were taken on with a small amt. of tinkering. I think I want to build a larger one, but foam wing is the way to go, coroplast is just too heavy for anything larger than this.
- At 8:24am on December 17, 2009, john bero said…
- Wild-thing specs.
48” wing span
11” cord
1” ailerons
48” length overall
36” X .75” alum. Channel
5 servo’s (slave for steering)
Basswood saddle for servos
.125 OD music wire (landing gear)
2.25” wheels
Landing gear offset 1.5” for camera clearance
Monsterpower 32 out-runner kv 770
11 X 7 prop
14.8 lipo four cell
80 amp esc
6 channel receiver
2” gutter pipe
Walmart paint ball magazine (motor housing)
Soda straws
.5” poly urethane firewall (Wal-Mart cutting board)
Yellow monocoat.
Misc. nylon screws, nylon spacers, glue, Velcro, etc
- At 6:29pm on March 11, 2010, William Premerlani said…
- Doug,
I am responding to your comment about putting a plane through a windshield. Its a bit off topic, so I am putting it here.
The guy who runs the local hobby shop in my town, Daryl, sold a plane to someone. Daryl drove out to the field on the day the customer took the plane up for its first flight.
Shortly after Daryl got there, the plane went out of control, busted through Daryl's windshield, and landed in the front seat of Daryl's car. Guess he lost money on that sale.
There is a picture of the plane, taken looking through the hole in the windshield, that is up in Daryl's shop, with the caption, "shit happens".
Daryl says there is no way to know for sure what happened, but his guess is that the crystal shook loose from the receiver.
Bill
- At 8:26am on June 29, 2010,
Dave Whittington said… - Doug,
A couple of things
1. I should be able to understand the code as necessary
2. I don't have ailerons - only rudder - but it turns very well as is
3. I only have a DX6i transmitter, so I will only be able to test MANUAL/other mode - one at a time.
4. I do have a gumstick video camera to record the flight along with the flash log
5. I will take my laptop along as necessary to download various versions - but I can't run the ground station as I didn't get telemetry hardware.
6. I will probably fly out slightly over the ocean - see http://vimeo.com/10569804 - but how close can my waypoints be for a figure eight ( I want to keep it in tight and over the beach).
Dave Whittington
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