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Old Nov 03, 2010, 08:22 PM
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What system?

Hi,
I'm a brazilian student and I am trying to build an uav to complete the following challenge:
Fly 250km between two cities with manual take-off and landing.
But I know nothing about uav (except the aeronautical part).
So, what equipment do you recommend to me? I need the most cheap and easiest to use auto pilot.
Please, tell me what are all the parts involved in an autopilot system.

Thanks,
Ricardo Cavalcanti
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Old Nov 04, 2010, 10:08 AM
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Moore, Oklahoma
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Thats a tall order! In one flight?

Thats a very long distance for one flight in amateur UAS.
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Old Nov 04, 2010, 10:45 AM
David1
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Interesting flight. If you wanted commercial level equipment you're in the wrong forum. Most everything here is hobby grade. Nothing against it but the target audience is students and people learning about UAV without a budget of millions of dollars (more like hundreds or a couple thousand).
What can be done with the Hobby UAV is impressive today. Likely one could fly what you say. However it would have no backup components in case a main one failed. Could stray off course if the flight plan was not well tested or if GPS was lost along the way...and such. Telemetry over that distance is a big deal.
A good way to research would be start with the Outback challenge and what the teams brought and their success/failures and why. That represents about the best of the best of the hobby market today.
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Old Nov 04, 2010, 04:52 PM
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My "challenge" is to fly between my city and an island that is 250km far.
So, I dont need telemetry because the idea is to turn on and let it go alone. In the island someone will take controls and land it.
I would like to know if there is any "hobby" autopilot solution, how much it will cost, what is the best company to buy from and your comments about this project.
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Old Nov 04, 2010, 05:19 PM
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Perfect bro, i would like to do the same, i am not an expert too, but maybe we can do something together...
I wanna make a plane that could flight for 4hours and could carry a load of 30 kg..
i you wanna do it together contact me by PM
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Old Nov 04, 2010, 05:23 PM
David1
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Quote:
Originally Posted by sansolo View Post
My "challenge" is to fly between my city and an island that is 250km far.
So, I dont need telemetry because the idea is to turn on and let it go alone. In the island someone will take controls and land it.
I would like to know if there is any "hobby" autopilot solution, how much it will cost, what is the best company to buy from and your comments about this project.
Paparazzi could easily do it then. http://paparazzi.enac.fr/
They easily flew across the Pyrenees mountain range between France and Spain a couple years ago. Did exactly that. One laptop at take off and one at the landing site. In the middle telemetry was lost but not the autopilot
Here's some details on that: http://paparazzi.enac.fr/wiki/Pyrenees_Crossing
It's also open source. Not in name you can download the gerber files from their site and have the PCBs made yourself. Assemble them yourself. YOu cold do it for < 500.00 USD that way. NO one else is as open with their designs as Paparazzi.
-David
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Old Nov 04, 2010, 06:05 PM
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I don't think the AP is at question here. The largest hurdle you are going to leap will be the aircraft that is capable of flying that amount of time or distance.

David is right Pap is a very proved design if your up to open source.
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Old Nov 04, 2010, 08:43 PM
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the aircraft itself is not a problem.
My teacher made a simple excel program to help us with general aspects of the project and some preliminary numbers are:

wingspan 7 - 8 meters
weight 60 - 80 kg
aspect ratio 8:1
autonomy 8 hours
cruise speed 72 km/h

250km is our first step. But the big goal will be 540km.
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Old Nov 04, 2010, 09:33 PM
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Quote:
Originally Posted by sansolo View Post
the aircraft itself is not a problem.
My teacher made a simple excel program to help us with general aspects of the project and some preliminary numbers are:

wingspan 7 - 8 meters
weight 60 - 80 kg
aspect ratio 8:1
autonomy 8 hours
cruise speed 72 km/h

250km is our first step. But the big goal will be 540km.
OK now were in a different world and I do agree with you on the flight time. BIG bird! We have many people that come on here are looking for a "small" bird that can do the impossible.

Send us an e-mail if you have any further questions in regards to the AP. As David mentioned the Pap system is very good as well.
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Old Nov 05, 2010, 11:58 AM
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Quote:
Originally Posted by sansolo View Post
the aircraft itself is not a problem.
My teacher made a simple excel program to help us with general aspects of the project and some preliminary numbers are:

wingspan 7 - 8 meters
weight 60 - 80 kg
aspect ratio 8:1
autonomy 8 hours
cruise speed 72 km/h

250km is our first step. But the big goal will be 540km.
sansolo, could you share that excel?
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Old Nov 06, 2010, 06:28 PM
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Jouse,
unfortunatly I don't have this excel. It was done by my theacher and I think he will no share, even to me.
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Old Nov 07, 2010, 02:56 PM
Worn-out the seat of my pants
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Electric or internal combustion?
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Old Nov 07, 2010, 06:27 PM
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okey sansolo, dont worry..
i am going to made it by internal combustion, and i think sansolo too
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Old Nov 10, 2010, 10:03 AM
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yes, internal combustion because is long range flights fuel consumption is important to reduce weight during the flight.
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