Bon jour, camerades

[Jaume Miralles]

Bon jour, camerades

As I promissed to Baptiste, here is my presentation.

My name is Jaume Miralles, i'm from Mallorca and i'm a telecom engineer (specialized on electronics).

I was intending to make a system to automatically control a kite and make it a reliable way to pull a boat, in my case it will be a single kayak if everything is ok.

I was searching for new info when i met your efforts on Hackster.io.

My development is yet far to be ready and saddly I only have time to spend on it when my customers let me so. I'll glad to share ideas and keep in touch with you all in this fascinating new fields to conquer that bring us the tecnology

BTW i'm generally relying on Raspberry/Gertbot for hardware and java for software.

Bes regards

[Nautilabs/Baptiste LABAT]

Thanks Jaume for this presentation,

Pulling a boat was my first goal as well.

What are you plans on these points:
-kite size target?

-kite type?

-only steering, steering and depower, steering and reeling, or everything?
-ground or embedded actuators? type? feedback?

-ground or embedded sensors? type?

Based on this, I could help you to find the corresponding developments I found elsewhere or I did.

I have tried several options, but without going far enough to get real success so far !

For the kayak part, did you have a look to Dan Tracy work
https://www.facebook.com/kiteboatclub

Steering with pedal seems a good option

and to Ingo Voegler development (steering with one hand)?
https://www.youtube.com/channel/UCTYlZ1MfQ81vvmEXsAEur2g

Please do not hesitate to make some remarks on the robokite project (I do know many things are missing (and even more in english), but it could help me to focus on some points, so that people coming after you can find materials faster).

++

Baptiste

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Baptiste LABAT - Ingénieur entrepreneur
Nautilabs - Nantes
http://robokite.blogspot.fr/

baptist...@nautilabs.com
+336 50 98 31 27

[Jaume Miralles]

Hi again!

Hi, Baptiste!

Well, about kite... i'm on it. I am pretending to get a second hand kite surfer's kite. No maths or brilliant argument behind it: I'm simply thinking that if it's working very good to pull a surfer and his board, making jumps available, i suposse it will be good enough for a reassonable velocity with kayak. Then my size target will be something standard in the state of the art of kite surfing... in my town we have moderate daily winds... maybe 10m2 would be a good starting point.

"only steering, steering and depower, steering and reeling, or everything?"

Yes, that's The Question.
A good starting point for me to control the kite was, again, attending to kite surfers. They have pretty expierence. They control it with 3 control ropes and one more for steering (well, you may find variations, but this one is quite simple to deal with). So, in my esqueme, motors will deal in a computer-controlled system with these 4 ropes. Now, i will have to plan how is sensing and actuations working:
- ACTUATION: The ideal would be having 4 motors, reeling and the depowering... i could get the maximum control. But it seems that keeping the electrical power to keep the opposite force to kite would be very expensive in electrical terms. Gripping the ropes, so that all the effort is relying on the piece that would grip, would be electrically cheap, but useless for control. Then my idea is, leaving 3 motors free to steer and reel but with tinny forces, just to change the surface the kite faces to the wind, and the 4th one, the one that would stand the main force, manually fastened. A system for automatically fasten is too much complication for me, and making it manually will be a few times during a journey. It seems to me a pretty configuration, but now i'm glad that i have some one that can tell me if it's crazy!!
- SENSING: My original idea was dealing with the meassure of the force made by the kite. After some research in the net i was realizing that there were some very complicated and expensive ways and devices to do that, and those were far from my budget and idea of simplicity. I think i saw in some of your blog something about artificial vision... is it possible? that would be nice, but complicated, isn't it? Last days i'm thinking on something it could be reliable and simple: putting a little circuit on the kite itself with accelerometers, then your system has a pretty precise and useful idea on board about where is, what roll an what pitch...

What I have seen from others is not too much by now:

- yours... is pretty advanced and i liked the drillers workaround, very good solution at least for testing. The motors need serious forces.
- Dan... my goal is being completely free and i'm using the kayak as it's what i can use right now... but will have an eye on it. At the first glance i saw he's using a "T" keel, as i was thinking to use, and shows me that i'm close to a good path. I don't like flying without an expirienced pilot onboard, you know :\
- Voegler... it was the first video i saw when i started wondering if a kite was powerful enough... i saw it... and I though "yes, let's start" :)

Know i'm studying the motors for the best option for my budget/torque/rpm... My idea, in the config of 3+1 motors, is that each motor should have around 20Nm and 30-100rpm... but not sure

what do you think? i'm really interested on your opinion

Best regards!

Jaume

PD: Getting energy is the next step and it's a nice idea, but pulling a boat will take its time first

[Baptiste LABAT]

Hi Jaume,

Where are you in your kite projects?

++
Baptiste