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4hv.org :: Forums :: General Science and Electronics
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Electric Motor Effciency (Density / Watt / Losses)

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Patrick
Sun Nov 03 2013, 01:30AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
You mean a omnidirectional transmitter on each battery, and a directional array on the vehical?
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BigBad
Sun Nov 03 2013, 02:40AM
BigBad Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
Omni on the vehicle, directional antenna on the ground
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Patrick
Sun Nov 03 2013, 03:38AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
But don't I want the drone to find the battery?
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Patrick
Tue Nov 05 2013, 05:08PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I'm getting ready to make a high altitude flight, 80 to 100 feet, for a demonstration to the Cal - fire training center. Due to t he risk of a fatal decent, I really want a camera on board, I'm currently trying to get my HD #808 key chain cam to work.

EDIT: I have made a test flight to verify the camera and other features are working. I'm editing and compressing it now. I'll upload it tonight...

EDIT: Presto ! video of crappy quality frown im tying to figure out how to upload higher quality vids. YouTube just blurs the hell out of my cool vids... Ive got the time stamp right now, this vid was made on 11/05/2013.

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Patrick
Wed Nov 06 2013, 05:21PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
pics
1383758499 2431 FT157199 Crash1

1383758500 2431 FT157199 Up1

1383758500 2431 FT157199 Up2

1383758500 2431 FT157199 Up3

1383758500 2431 FT157199 Up4

1383758500 2431 FT157199 Up5

1383758500 2431 FT157199 Up6
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Ash Small
Wed Nov 06 2013, 08:21PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
It looks a lot more stable in this latest video than in your earlier videos, Patrick. smile
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BigBad
Wed Nov 06 2013, 10:48PM
BigBad Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
Pretty damn cool.
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Patrick
Fri Nov 08 2013, 04:27PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I may have a environmental science and survey group who wants to reduce cost by using my drone, to monitor cliff sides and river scouring erosion .

But the FAA has made it illegal to use drones for commercial purposes. Not sure if profiting or payment for a university research flight means thats illegal too?
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BigBad
Fri Nov 08 2013, 09:53PM
BigBad Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
I think it's illegal to operate drones for non recreational purposes, so you could build them and charge them for the drone; but they would need a license to fly it for that purpose.

edit: looks like the FAA don't have a leg to stand on, there's no law on it, it's basically a remote controlled aircraft, and there's no law against flying those for profit:

Link2

If the university were the ones flying, then it would be them versus the FAA, and I would expect that their legal department would be up for the FAA's bullshit.
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Patrick
Sun Nov 10 2013, 07:20AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Still need some PID tuning, got into a "fender bender", with a bit of damage due to a roll oscillation. My "P" was too high... minor damage, ill fix it and be in the air again on Tuesday for a power and time of flight test. Im after some real watt numbers for power needed to hover.
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