Aaand we're rebuilding everything. Turns out 90 km/h straight down is not a landing.
Martin Seven's Discussions
Triple-axis gyro for quads?
Started this discussion. Last reply by Michael Zaffuto May 8, 2010. 3 Replies 0 Likes
GPS module for high altitude unmanned balloon
Started this discussion. Last reply by Martin Seven May 12, 2010. 11 Replies 0 Likes
Martin Seven's Page
Latest Activity
Martin Seven replied to Petrus Botha's discussion 'How do you calculate quadcopter lifting capability?'
Assuming your power grid will be able to feed them all at once (what is that, 40 A each?), then yes, you multiply by 4 :-)
Martin Seven replied to Nigel's discussion 'Baud Rates - Why don't we use 115200 all the time?'
I've been testing 802.11a modules by UBNT (XR5). Live HD from the air is not nearly as impossible as people think.
Martin Seven replied to Limebear (Rob)'s discussion 'Pre-Flight checklist'
Ah, remote activation, even better. All OK then!
Martin Seven replied to Limebear (Rob)'s discussion 'Pre-Flight checklist'
Wouldn't it be safer to switch steps #6 and #7 in the field checklist?
Martin Seven replied to Chris Malyon's discussion 'Lipo Issues'
What are the batteries' C ratings? Assuming they're roughly the same, the larger battery will be able to feed the motors more power. The smaller battery could be the limiting factor.
Also, Turnigy SK motors are to be avoided.…
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
It might be acting like that because the open signal wire is picking up noise. Try pulling the ESC signal line low (grounding it) with a 4k7 resistor. That should take care of the noise without affecting normal communication.
My Turnigy Plush, when…
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
Regarding ESC brakes, do they have an effect on the actual spinning (increased consumption etc.) or are they applied just for braking, when throttle command = 0?
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
Deformation zones aren't very practical for aircraft without fuselage, or for aircraft that have huge booms sticking out of them, or for aircraft that can come down in any orientation. A quad passes for all three.
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
You could ground the signal wire, but that will initiate the brake after a delay (about one second). A more involved option would use a simple rugged PWM generator that would output 50% duty cycle (zero throttle) that you would switch all signals…
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
With Turnigy ESCs (and others) you can enable the "Break" option. What it does is it forcefully stops the motors if you command 0 RPM (lowest calibrated PWM value). They stop from hover speeds to zero in a second or so.
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
My mother's a seamstress so I had a bunch of 1-meter square chutes made from extremely fine cotton. 55 grams each. I haven't tested them yet, so I'm flying them with the pyro disconnected. Can't wait for the summer :-)
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
Yeah, it's not explosives. It's a teeny tiny lightweight device that when commanded turns itself into about a liter of gas that can push things... out of other things. With unmatched reliability and weight.
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
There are a number of ways. Mechanical (springs, pistons, levers... actuated by servos) that are heavy and slow, natural (drogue chute positioned to open on its own when the airspeed reaches a certain level) which is dangerous because you never know…
Martin Seven commented on ARHEXA's blog post 'PARACHUTE anyone ?'
Squalish, those 30-120 g are averages, not peaks. Peaks could very well be within the 10,000 g neighborhood, and that's enough to develop hairline fractures in the structure and definitely enough to reliably kill gyroscopes, accelerometers and…
Martin Seven replied to Grips's discussion 'Arducopter Advertising Video'
It's more like an animated feature list. There's no actual Arducopter shown. What is it? Why does it need gyroscopes and wireless commands? Judging by the video it's probably some sort of an elaborate remotely-commanded gasoline…
Profile Information
- About Me:
- Model rockets, balloons, planes, pyrotechnics, artificial life, automation... I'm into pretty much anything that flies or does stuff on its own.
- Tell us a bit about your UAV interest
- I'm building a fully autonomous VTOL machine because:
* I like stuff that flies
* I like stuff that does stuff on its own
* I want to have an eye in the sky
* I can
- Hometown:
- All over the place
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