First, congratualulations to Brian Wolfe, the winner of the second round of the T3 Contest. Now it's time for Round 3.

This round's objective is to break the Stanford team's UAV altitude record of 7,142 feet by doing at least 24 circles with a 300ft climb and descent in each, as shown above. (This won't really beat his official record, because there won't be an official judge there. But you'll get bragging rights, at least).

The winner will have the highest cumulative altitude, but anyone who exceeds 7,142 feet will win a prize.

As usual, you must submit a KML track and video in the comments below. Evidence that fun was had is welcome (and may influence Gary's point assignment blackmagic equation), but is not required.

Deadline is Midnight PST on November 29th.

Views: 2463

Comment by MarcS on November 23, 2009 at 3:35am
Hi,

I forgot to mention the video.
A Flycam was attached, but it seems the camera does not like the european winter temperatures...
It went dead after 30s of flight :-(
If anyone is interested in a launch video, I can post it...

Marc

T3
Comment by Krzysztof Bosak on November 23, 2009 at 9:51am
FlyCam has magic property: it NEVER records anything dangerous or unusual.
As long as FlyCam records, you are SAFE.

Moderator
Comment by Sgt Ric on November 23, 2009 at 11:01am
Unlike the CIA, the FAA hasn't yet picked on europeans.

T3
Comment by Mark Griffin on November 23, 2009 at 11:46am
MarcS, Great effort and will be hard to beat.

If the weather improves here before the 29th Nov, I will have a try at beating the 4000m barrier with my 4600 mAh Lipo.....

Moderator
Comment by Gary Mortimer on November 23, 2009 at 12:29pm
What fantastic entries so far, well done everybody.

T3
Comment by Mark Griffin on November 26, 2009 at 7:14am
I took advantage of a break in the poor weather and I beat not only the 4,000m barrier, but the 5,000m and 6,000m barriers!!!!

Details are:
- Easystar with Paparazzi Autopilot.
- U-blox LEA-5H Navilock GPS with ceramic patch antenna.
- 4600 mAh 3S LIPO battery.
- 62.5 climbs
- 6'041 metres (19'819 feet) cumulative climb. This is almost 3x the Stanford record!
- 4'408 seconds total (1h 13 mins 28 sec).

GPS altitude and battery voltage plot:


KML file:
T3-R3#3_4600mAh_6041m.kml

Side view (a neatly wound ball of string);


Top view. Very smooth:


All went exceedingly well without incident and I was amazed with the results. Auto 2 mode (autonomous) launch. Stayed in Auto 2 until the battery was exhausted.

Video will be posted soon. I will provide other interesting technical details after the competition.

I may try again if the weather is kind to me before 29th November in order to beat the 20,000 feet barrier.

Cheers, Mark
Comment by MarcS on November 26, 2009 at 7:44am
WOW
That is efficient usage of power... and time.
Especially the descent seems to be faster (ok, the EasyGLIDER has the name for a reason :-)

Ok, just a rough calculation of efficiency over all: m*g*h for 6000m and an estimated weight of 800g: 13Wh
Energy content of Lipo: 11V*4,6Ah:50Wh
->Efficiency 25% Energy to height transformation, sounds good!

Marc

T3
Comment by Mark Griffin on November 26, 2009 at 7:58am
Yes MarcS, your calculation is spot on. /Mark

Moderator
Comment by Gary Mortimer on November 26, 2009 at 9:14am
Blimey
Comment by Zouhair on November 26, 2009 at 1:15pm
Congratulations Mark, that's pretty impressive performance.

But just to set the 'record' straight. Our official attempts were plagued with winds aloft, so they were shorter than we usually can do. So just for reference, here's and altitude plot back from summer flights. We were capable of slightly over 4000m on a 2600 mAh battery which works out to be
.42*9.81*4000/(7*2.6*3600) ~= 25%, so roughly the same efficiency :)

Again, congratulations on such good performance.


(black is RC. Landed after some trimming then took-off and landed autonomously)

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Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Vertical Horizontal one, is here

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