""Bring a trash bag." Bahahahaa! That's awesome."
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Ground Loop
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- San Diego, CA
- United States
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Ground Loop's Discussions
ArduCopter RC2 GPS Hold: Works better in + than X mode?
Started Feb 27, 2011 0 Replies 0 Likes
I was out flying the Arducopter in X mode today, just to see if orientation was easier (it's not). I noticed that GPS Hold mode wouldn't play nice -- it had a lot of translational drift. I switched…Continue
Tags: mode, orientation, hold, gps, arducopter
Arducopter frame design: Where to learn/read?
Started this discussion. Last reply by Sebastian Gralla Mar 17, 2011. 16 Replies 0 Likes
I'm scratch-building a new Octocopter, in the style of the Hashcopter, using square aluminum tube, and eight motors ganged as pairs with (Quad) Arducopter software. Where is a good place to learn the…Continue
Tags: frame, octocopter, hashcopter, scratch
Wind Damping for Barometer?
Started this discussion. Last reply by Ground Loop Feb 9, 2011. 2 Replies 0 Likes
I've noticed that the Arducopter holds much more stable altitudes in steady air than it does in wind. On breezy days, the Arducopter will climb/fall spontaneously while in GPS Hold. In still air, it…Continue
Potentially fatal bug in Arducopter?
Started this discussion. Last reply by Ground Loop Feb 7, 2011. 26 Replies 0 Likes
My Arducopter RC2 turned off all four motors at about 100' up today, and plunged to its death with no rotors spinning. I believe there is a software bug or misguided feature at the root of it. I was…Continue
Tags: disarm, hold, gps, crash, arducopter
Ground Loop's Page
Latest Activity
ModeratorSebastian Gralla replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?
""How would it work if you make propellers in different level and make them slightly overlapping each other? This way you could make the frame even smaller."
trust me, don't do this. the tips of ech propeller move in and out of…"
Markus Jahn replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"It seems you are taking this design step further than I did.
I have flown a MK octo with i2c escs and my hashcopter with quad code + pwm escs, I must say hashcopter is still not as sophisticated as a "real" octo. In some…"
Squalish replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"Are you talking about using 12 bar segments or 4?
One thing I like about the hash: I'm fond of the idea of keeping the quadrilateral folding mode intact. Assuming you can get wide enough square tubing that you're not compromising…"
ModeratorSebastian Gralla replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?
"ah sorry, thought you were talking about a quad and hashcopter is just a name of a fancy control board"
Ground Loop replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"I see.. yes, we agree.. 41.42% of the rod length is the space between parallel rods.
Length = (1 + sqrt(2)) * spacing
Spacing = (sqrt(2) - 1) * Length
Segment lengths are:
space / (sqrt(2))
space
space / (sqrt(2))
I think…"
Ground Loop replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"I do know aluminum square tubing is incredibly cheap. :) I've got enough to make about a dozen experimental airframes. Rigidity should be superior to the center-hub designs.
Having the cross-bars mount somewhere OTHER than…"
Squalish replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"See math above. Wording it differently:
Distance between parallel arms should be about 41.4% of distance between opposite motors on a single arm."
Squalish replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"So, using the geometry, Google Calc says optimal crossbar-to-crossbar spacing is:
1 / ((2^0.5) + 1) = 0.414213562
As long as you're keeping the arms of equal length, excess motor spacing is proportionately equivalent to simply reducing the…"
Ground Loop replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"Aside from spacing, I still haven't found any pro/con comparison of the Hashcopter "paired motors" Quadcopter control, vs the more traditional Octocopter (eight motor control). I'm still looking for the catch, since it…"
Ground Loop replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"Check your math on the Hashcopter. Space the parallel arms such that all adjacent motor pairs are equidistant, arranged in an equilateral octagon. There's no 40%."
Squalish replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"In a quad, yes. In a hashcopter, which is a type of octocopter composed of two perpendicular pairs of parallel arms with motors at both end, no.
Quad: X
Hashcopter: #
"
Ground Loop replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"Right on, Sebastian.
I'm building mine this way, with equi-distant prop hubs. The total length of the 'hashcopter' bars is then divided into
Left + Center + Right
Where Left & Right are each Center divided by the…"
ModeratorSebastian Gralla replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?
"40% is not correct....
70.7% of motor to motor is the maximum propeller diameter (theorem of Pythagoras)"
Squalish replied to Ground Loop's discussion Arducopter frame design: Where to learn/read?"I've been looking at this recently - the Hashcopter design is alluring. There are two variables here on a symmetrical hashcopter: motor to motor, and motor to crossbar. Making m2c between 25% and 35% of m2m allows you to maximize…"
Ground Loop replied to Gary H's discussion MediaTek GPS - Blue LED Lock, No-Lock IMU RED (C) LED"Which one is that?
There is a
#define IsNEWMTEK // Do we have MTEK with new firmware
which is about the worst feature name ever, since there's always a new firmware and this doesn't specify which.
"
Profile Information
- About Me:
- Heli & fixed wing
- Tell us a bit about your UAV interest
- Open source, Arduino, and R/C.. what's not to like
- Hometown:
- San Diego, CA
Ground Loop's Blog
Arducopter gets excellent navigation lights: $11, but 91g
Posted on February 12, 2011 at 11:30pm 8 Comments 2 Likes
In-flight orientation continues to be a challenge in fast forward flight, so I thought I'd try some LED lighting.
These lights are each 24 centimeter strips, with 24 LEDs molded in. I got them from eBay seller 'brledlight', and I'm amazed at the average selling price of these things.. less than $3 each! What a…
Continue New Arducopter survives maiden flight, with grace and style.
Posted on December 26, 2010 at 11:30pm 20 Comments 0 Likes
My DIYDrones Arducopter survived its first few flights without incident! This is my first quadcopter, and first Ardupilot project, so I'm actually a little surprised it flew so well.
Very stable.
This is the FahPah "all up" kit, with an added XBee Tx and Futaba R6008HS.
Arducopter NG…
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Season Two of the Trust Time Trial (T3) Contest has now begun. The third round was a reliablilty/aerial photography round for both planes and copters, which is now closed. Stay tuned for the next round, beginning soon.A list of all T3 contests is here.
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