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After flying the raptor several times with the 8"x4" prop, we felt like we were stuck in 2nd gear not harnessing the full potential of the motor.  We decided to fly the raptor with several different props with a range in diameter and pitch.  This was a first step in figuring out how we will more scientifically analyze the benefits and losses associated with various props.  For now we were making qualitative observations and monitoring speed using the RCSpeedo iPhone app (definitely transitioning to APM2 on board sensors and telemetry for future analysis). We used APC props with results as follows:

Changing Pitch:

8"x4" - 54 mph, motor seemed to handle this size well, ranging through different RPM as increasing throttle to max

8"x6" - 57 mph, felt faster at lower throttle, but top half of throttle range felt over burdened.

8"x8" - no speed recorded, flew just fine but definitely too much prop for this size motor.

Changing Diameter:

6"x4" - 37 mph, felt like 1st gear

8"x4" - see above

9"x4" - flew but unfortunately plane battery was too low to make observations. 

We will revisit this again in the future! Anyone with recommendations about how to model prop dynamics please point us towards any available resources that you trust.  Thanks!

See you Wednesday,

-Trent & Nick

--Raptor & Shrike--
Battery: 20C 2.2Ah Sky http://www.hobbypartz.com/77p-sl2200-3s1p-20c-3333.html
Servos: T-Pro 9G http://www.hobbypartz.com/topromisesg9.html 
Motor: Optima 450 2220-1800KV http://www.hobbypartz.com/75m55-optima450-2220-1800kv-2.html
ESC: Exceed RC Proton 30A http://www.hobbypartz.com/07e04-proton-30a.html

Produced by Trent & Nick in Arkansas, USA
Main Camera: Panasonic HDC-TM900K
Video Editing: iMovie

Looks interesting, maybe the first "toy" rtf UAVUAS/RPAS/DRONE from china with real autopilot.

I was told this will be ready this summer.

A pan & tilt system for Skywalker / X8 wing for installation inside fuselage.

Here you have some pictures for inspiration and stl files if any should be needing this P&T.

Here you have STL files if you want to cut or print your own piece.

P-T-x8.zip

Enjoy

I'm stumped. All they say is "For the multi-rotor fans. Coming soon." Anybody got a guess what it is?

I interviewed MIT professor Missy Cummings at the Wired Business conference in NYC a couple weeks ago and the video is now live here. She's now on temporary assignment to the Office of Naval Research awarding grants on robot medivac helicopters. 

You can see some similar 2010 research on this by Carnegie Mellon professor Sanjiv Singh in the video above:

If you're a New Yorker subscriber you can read Nick Paumgarten's very long and well-reported article on civilian UAVs in this week's New Yorker. It quotes a lot of people including this one from me: 

"The Internet was once a military thing, but we colonized it and took away from them," Anderson told me. "Right now, drones are scary. I'd like to make them unscary. What if all the UAVs in the air don't say LAPD [Los Angeles Police Department] and, instead, say 'Pizza Hut'?"

Includes visit to Aeroenvironment and U Penn's GRASP La, home of the swarming nanoquads shown at right. 

Get your planes and copters out there this weekend for the current T3 competition! Deadline is Sunday night PST.

I wanted to analyze some data from a tlog file and figured that Excel would be the most flexible  way so I created a little utility to extract the data I was interested in and save it as a comma separated value (CSV) file. Each selected parameter is in a separate column, and Excel can open  the csv directly.

Note that it can't open the tlog file directly. You must use the Mission Planner to convert it to txt format. so:
1. From the APM Mission Planner Flight Data page select "Telemetry Logs", then "Tlog > Kml or Graph", then "Convert to Text". 

2. Select the tlog file you are interested in, and the Mission Planner will create a txt file in its log folder. 

3. Open the txt file in this program and it will parse the file and list the available parameters in the left tree control. Double click on the parameters you are interested in and they will be selected and displayed in the right tree control. If you want to remove a parameter from the selected list, double click it.

4."Save As" and provide an output file name. This will produce the csv file that you can open in Excel and plot as desired. The file will look like this, where each row was produced from one packet in the input file that contained at least one of the selected parameters.

If you want to re-use the list of parameters you can save and re-load them from the "configure" menu. These are simple text files you can edit directly if you like.

I am not familiar with the deloyment process for C# programs, so I have placed the entire project folder here. 

I had previously setup my video receiver and telemetry set on a tripod with a PVC "mast" to establish height and antenna separation.  Xbee on one side, video receiver on the other.  My ASUS tablet PC hung in a case on the cross-bar between the two masts.  Video runs down to a Digital-8 video tape recorder, sitting on the ground because it's weight was difficult to balance on the wooden platform between the tripod and the PVC frame.  Power is provided by an AC inverter in the SUV,

I setup the tripod right next to my SUV.

Unfortunately, the tripod was pretty unstable.  I've had the whole assembly fall over due to wind and even with a stable tripod, the pan/tilt assemble is a weak point.  With the PVC frame it was quite top-heavy and it required me to run an AC cord out from an inverter in the cargo area to power the video recorder, tablet PC and video receiver.

After thinking that one through a bit more, I decided to rig up an antenna mast with a magnetic base that I could mount on the roof of the SUV. 

It's bigger than it looks.  I built it from 1-1/4 inch PVC rather than the 3/4 inch PVC the prior apparatus is made from.  The magnet base is about 6 inches in diameter and quite strong.  With this setup, I can get the antennas up as high as with the larger, more cumbersome tripod arrangement, but with a simpler, smaller apparatus.

I was able to identify a number of additional advantages:

- I can pick-up and chase an runaway plane without having to load equipment back into the SUV, maintaining video/telemety contact on the move.  This might be a bit sketchy.  I would never intentionally "operate" in this mode, but if moving the ground station (with a designated driver) will allow me to regain control, I think thats a good thing.  If I seriously ever want to do this, I'll have to examine just how strong the mount would need to be as a function of the possible speeds the SUV would be moving at.  Dirt road at the flying area - easy.  65mph on the adjacent freeway while the plane tries to fly to Tucson - not so easy.

- After launch, I can take a seat inside the vehicle, benefitting from AC (it gets hot here) and shade (tablet display is hard to read in bright light.) I'll have to ease into this to ensure I truly know what I'm doing here.

- Affords better protection to the video recorder and tablet PC.

- I believe that being mounted on the roof will provide the antennas a source of reflection that would benefit them in terms of additional gain.  There won't be any electrical connection to establish a true ground plane (at least not intentionally), but just reflection alone should help a bit.

I'll come back and post more photos as I actually assemble the various components onto the SUV.

http://www.pansa.pl/euro2012/index.php

http://ais.pansa.pl/?lang=_pl&top_menu=top_ais&left_menu=menu_ais&opis=euro2012

and in particular http://ais.pansa.pl/pliki/supplement/EP_Sup_2012_17_en.pdf

says (rougly, read details by yourself) not a single unauthorised aerial vehicle (not even RC model) since 1PM within 50km circle from stadium during the day of major meeting

plus

permanent no-fly zones in several city centres and footbal training camps of 2-3km diameter during a month.

Restrictions end rougly July 2nd.

50km cricle is quite large; you might be surprised to break the law during local filming somehwere in the village if a major match is taking place.

So forget your engineering diplomma, familiarize yourself with chips and beer then sit down patiently in order to watch the TV transmission organised by EU governments as 22 guys run around randomly spitting on the grass, or the police will be chasing you.

Sad breaking news.

A foreign engineer from an Austrian company was killed and two South Korean colleagues were injured Thursday when an unmanned spy drone crashed into their control vehicle during a test flight, police said.

The trio were testing the aircraft for South Korea’s military in the western port city of Incheon, police said.

“A 50-year-old foreign engineer from an Austrian company died on the spot when the S-100 drone crashed while they were controlling it remotely from inside the vehicle,” a police spokeswoman at Incheon told AFP.

http://www.suasnews.com/2012/05/15515/schiebel-s-100-crash-kills-engineer-in-south-korea/

Having seen the post about football airspace restrictions thought I should add this

Smaller airframes perhaps used by drone journalists would be subject to current ANO provisions. Any part of a CAA 1:500,000 chart that is yellow is considered a built up area and therefore not suitable for UA flight. So a pilot observed flying anything outside of approved RC flying sites within the prohibited zone might expect an interview on the 13th floor at Gatwick with no biscuits. I doubt if they will go after a small boy in a park, but try them with a camera equipped anything. 

If you have any thoughts of showing off and posting some FPV videos whilst this is going on from anywhere in that red area you need your bumps read. They will prosecute you if caught no questions asked.

Unlike other parts of the world there are clear rules that you will be breaching. That always applies to the yellow bits on a CAA 1/500,000 but its if they choose to come get you.

More reading here http://www.suasnews.com/2011/03/4439/olympics-2012-airspace-restrictions/ 

Here is what the entire area looks like with restrictions of some sort or other in force.

The CAA in the UK have been very good to unmanned aircraft types, especially those of us in the small world. Other countries still do not have regs permitting commercial flight and clear lines drawn in the sand. Lets not ruin a lovely thing.

Almost finished with Skywalker fuse #2.I used liberal application of velcro to attached each camera.  The ContourHD also uses a removable velcro/adhesive mount.  The good part is that now I can turn the cam power on and set to record without having to remove the camera from the canopy ("cam-opy"?).  As you can see from the photo below, I cut the hatches rounded instead of following the hatch lines moulded into the fuse by the manufacturer.  This was based upon the realizing that the  sharp corners on the previous hatch weakened the structure.  After the first crash I had to glue/reinforce the structure that failed at the corners, totally shearing the foam between the canopy and the fwd/top hatch corner.  I wish I had taken pictures...Added 2 video cameras and an HD camera to the pod that now comes in lieu of the foam canopy.  Below you see the fwd facing HD and video cameras.  The HD camera does NOT provide NTSC output to the video transmitter, unlike the GoPro.  Thats the primary weakness of the ContourHD (in addition to weight).  You can see here the side looking camera.  This camera, with video switching (waiting for units from nghobbies.com and flytron.com) will allow me to switch from fwd looking to side looking whenever the UAS is circling in loiter, "fly to"/guided, RTL or on command.  The aluminum mount can be bent to adjust the angle as I make some test flights.  Starting position will be 90deg.  Looks like its going to work out well...

As is customary and traditional, we celebrate every new 1,000 members here and share the traffic stats. This time it's 25,000!

There were 1.4 million page views this month, which is close to a record. It just took us four weeks to get this latest 1,000 members--we're averaging about one new member every 43 minutes.

Thanks as always to all the community members who make this growth possible, and especially the moderators who approve membership applications and blog posts and otherwise answer questions and keep things ticking here. We've got about 50 moderators now, but if anyone would like to join this group, please PM me. If you've been here for a while and have been participating, you'll fit in great.

XBee Pro 50mW RPSMA - Series 2 (ZigBee Mesh) - Sparkfun part: sku: WRL-10419, can not be used for Two-Way telemetry.

If you are looking for two way telemetry using a pair of this module “XBee XBP24BZ7”, then better do not buy it at all, I purchased one pair and suggesting, based on my findings.

For transparent serial communication between the airplane and the ground station, you need to configure one of the mudule as XBEE COORDINATOR AT" and the other one as “XBEE ROUTER AT”.

The the X-Bee configured as “COORDINATOR AT” will be at the ground station and the other one which is configured as “ROUTER AT” will be in the airplane.
My findings are;

1. The speed of data flow from Rouert AT X-Bee to Coordinator AT X-Bee is very fast and have no issue.

2. The speed of data flow from the Coordinator AT X-Bee to Router AT X-Bee is very very slow and not acceptable.

When I tried to use with APM, It was very very difficult to read and write waypoints from the ground station.
First I suspected if there could be any hardware issue in one of the X-Bee but it was clear when the problem got shifted when I swapped the configuration of the two X-Bees “XBee XBP24BZ7”

I tried on different bauds and even newer and older firmwares of this X-Bee “XBee XBP24BZ7” but same problem.

However there is no such issue in “XBee Pro 60mW Wire Antenna – Series 1 (802.15.4)” sparkfun.com/products/8742

Digi needs to take care of this issue promptly if they really want to keep this product selling.

Recorded video, describing this problem:
vimeo.com/41900865

Alright... once in a while a maiden flight doesn't go so well, this is one of those times...

Obviously the CG was a little far back and the throws/size on the control surfaces were WAAYYY to big. I'm telling you, it was almost un-flyable. 

Luckily, a quick repair job and some adjustments and we'll be back in the air.

We just got an APM2 in the mail, so when the Shrike is doing the right things we can finally get into some drone action!

Until Saturday,

-Trent and Nick

In my previous post I described how to show APM telemetry data on Hitec Auroras screen. The code has now been updated to support APM2 board, though APM1 is also supported. New firmware also adds support for GPS coordinates. Only thing still not supported is GPS date and time since APM internal date format is yet to be decided.

More info here: http://antibore.wordpress.com/2012/05/10/showing-apm-telemetry-data-on-hitec-auroras-screen-revisited/

so, following my post here: http://www.diydrones.com/forum/topics/futaba-t7c-channel-5-mode-switch

and the tutorial here: http://diydrones.com/profiles/blogs/configure-6-flight-modes-for

things didnt really didnt seem to fit when trying to set up my radio for six flight modes.  after a couple of days blundering through mixes and comments from other users i finally started to understand what the different settings were doing, and found that half of what i had done was unnecessary.

once i had a clear idea of what changed with each option it was a case of a few minutes getting everything just right.  as promised, a video.

Gene from RP Search Services shares some of his considerable experience with Patrick.

http://www.blogtalkradio.com/suasnews/2012/05/09/suas-search-and-rescue

If you have any ideas for people we should invite as guests then please email Patrick, patrick@suasnews.com 

We have a few ideas going forward and hope its of use to the community at large.

Cheers

Gary

Would love to hear your thoughts at http://www.facebook.com/suasnews as well.