Robert Krogh (hooks)'s Posts (72)

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About Video Transmitter

Posted by Robert Krogh (hooks) on October 11, 2009 at 5:30am
I know that most countries have legislation in terms of radio / video transmitters. I also know that many people do not always comply with this legislation.What are your experiences and opinions with video transmitters?

1. Frequency2. Power3. Range4. Range with Antenna tracker.5. Effect on GPS signal.6. LAWI know that there is no reason to discuss range since the law says in line of sight when you fly with RC. But still there is also some who "accidentally" gets to fly just a little outside the LOS.I have recently been in contact with a company who produce video / data transmitters.Any one in here who has experience with these transmitters.1.

2.

3.

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How to get more room for payload in Easystar.

Posted by Robert Krogh (hooks) on October 7, 2009 at 7:00am

I made a new fuselage for the easystar to get more room for payload. This proto is made in 2 layers of carbonfiber. The carbonfiber is very easy to work with, so if any one out there like to make some modifications just go for it.I got the carbonfiber from hereThe weight of the T-REX fuselage is about 140g = 4.93 ounces - still need to make the inner fuselage so the fuselage can be fasten to the body and still be removerable. Think the whole carbonfiber fuselage will be about 160g = 5.64 ounces.

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OWL: UAV / FPV platform

Posted by Robert Krogh (hooks) on September 11, 2009 at 2:30am
A new platform "OWL" will soon be ready for small RC UAV / FPV flying.

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The plane will look like this:

The model are made in glassfiber and balsa:More info on the OWL will come in the near future!A new Platform based on the Multiplex Alfa 2100 are on the Drawing board.Modified as a pusher.Wingspan 2.1MVery stabel platformGood for payload.

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I have a proposal for a new platform for uav.

Posted by Robert Krogh (hooks) on June 14, 2009 at 1:00pm
I know this is a bit risky to propose a new platform for a UAV, but I think it could be a very good platform.The system are slow, stabel, won't brake if a crash should happen, easy to operate, ok payload.How about having ArduPilot installed on a RC Paraglider.I hope you all can se the opportunities with this kind of systems.See more here RC ParagliderI hope to here some comments from the creates.
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Reply from Multiplex on a request for a bigger "easystar" model.

Posted by Robert Krogh (hooks) on June 9, 2009 at 11:16am
Here is the answer from multiplex on a request for a bigger model like Easystar.Hello,we got similar requests from several other pilots as well.First of all, the Easy-Glider was made in some view to get a bigger plane with adequate flying caracteristics than EasyStar.We know, that with the prop in front it is not that easy to convert, but some people did this with good success.On the other hand it is not possible to make the same model simply bigger.The demanding on stuctural strength is dramatically increasing, especially, when the wight is increasing by additional payload.The molding costs are much higher and usually the bigger the model the smaller the qty which means highly increasing costs per pcs.From our point of view, at this stage the group of people, who areusing cameras and/or GPS-System in the EasyStar is kind of piggybacking on the succes of a model designed to learn to fly.And this is still by far the majority of EasyStar-customers.From our point of view it take a while till this specific demand justifies a specialized model, made of moulded foam. Other manufacturing technics, which does not require such a big investment suits better at this time.But we have several models which probably could be adapted, e.g. the Twinstar, which we in our house are using to make fotos with a standard digital camera.Another model with high capability of payload is the Mentor, which we are using as carrier for rc-parachuters with a wight of 600 to 800 g.Or on a slightly smaller scale the EasyCup works very well to carry camaras.Best regardsMULTIPLEX Modellsport GmbH & Co. KGGerhard GreinerMarketingleiterHmmmm....
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JR mx 12 long range TX

Posted by Robert Krogh (hooks) on June 1, 2009 at 3:30pm
My JR mx12 FM 35 Mhz TX got an overhaling made by Thomas Scherrer.FM 35 Mhz 10 mW - UHF 433 Mhz 500 mW ( secret button1,3 W)

Replacement of the FM tx to the new long range UHF tx.

OLD FM TX

New UHF TXDon't have to think about channel or "range" anymore.With a Yagi antenna and the new tracking antenna from immersion I hope to get a good range. My goel is about 15-20 km.(Did I mention the 7W booster I also ordered from Thomas Scherrer shhhhh).I'll gess the video link will be the week point now.More will come about this new option.

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Pan and tilt for video link

Posted by Robert Krogh (hooks) on May 6, 2009 at 12:30pm
Because of bad weather her in Denmark I had the time to make a pan and tilt system for my Seagull 2200 inspired by the pan and tilt system from Range video. (DIY is much cheaper). I have ordered a 1 Watt 2,4 Ghz Video TX and RX from Range video so now the Seagull will soon be ready for a FPV flying.Still wayting for better weather before I can start testing Ardupilot again.
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First testflight UAV Seagull 2200

Posted by Robert Krogh (hooks) on May 3, 2009 at 3:00am
Yes the first testflight is over, and the seagull 2200 are still alive.I planed a small 5 waypoint route on a open area near Aalborg, Denmark.

After calibration on the FMA sensor I was ready to give it a try.After a little manual flight I pushed the auto button on my remote CH 5.. So far so good. The plane started making bit of rocking with the rudder - after a sec or two the plane gets stabel and just holding the course... hmmm.. Not navigating as it surpose to do. I tried about 5 times to se if there are any sign of showing just a little navigation for the first waypoint. But just a straight path.

So what might be the problem?If I try "flying by wire" without the gps I have one very weak control over the rudder and elev.Anybody out there! anybody.. :-(Here is the function on the board... It looks right to me.
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UAV Seagull 2200

Posted by Robert Krogh (hooks) on May 1, 2009 at 12:30pm
Now my Seagull 2200 are ready for first testflight. I have uploaded the ArduPilot_EasyStar_WP code on the board so I "hope" it can make a testflight so I can optimize here and there...The seagull 2200 is a very stabel mashine modified with a stronger motor and a bigger prob.

Offcause I will post opdate on the comming up testflight and changes on boardcode for this model. Hope to make some videodokumentation also.I have one problem with the pre test- I installed the FMA sensor just like instruction. But when I point the nose down the pitch also going down.. so I need to reverse the settings. I'm using code 2.0 and not the new 2.1How to do?
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Here is the solution:In the 2.0 code, try this:Reverse IR sensor-old code-return constrain((int)(((infrared0-511)*90)/max_ir),-60,60);new code-return -constrain((int)(((infrared0-511)*90)/max_ir),-60,60);Reverse IR sensor pitch-old code-return -constrain((int)(((infrared1-511)*90)/max_ir),-60,60);new code-return constrain((int)(((infrared1-511)*90)/max_ir),-60,60);Just reverse the sign in front of "constrain".
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