I just got finished my octocopter with Arducopter electronics. It is built to carry DSLR and should fly 7-8 minutes with 1000g payload. Copter is actually just a quad which has two ESCs and motors on each end. It proved to be really stable platform on first tests last weekend.

 

I fly with 5000 mAh 14.8V Lipos and have eight 750kv/100W motors. Still the flight time with such a heavy camera will be short. But actually from previous experience I know 5 minutes is long enough for photographing a target. After that you can land, change battery and make a plan for next 5 minute flight.

 

Images of my build can be found:

http://www.markusjahn.net/gallery2/main.php?g2_itemId=45850

and first flights:

http://www.markusjahn.net/gallery2/main.php?g2_itemId=45735

Youtube -video shot from another Oktokopter:

http://www.youtube.com/watch?v=viEoOtErBnU

 

 

Views: 2546

Tags: Arducopter, Octocopter, Oktokopter

Comment by Marco Glattfelder on January 24, 2011 at 6:39am

That is what I call a pragmatic design. Really effective and simple. You just need some snow skid :-). Do you connected the ESC couples just in parallel? I am wondering what happens if one motor fails.

 

Comment by steve F11music.com on January 24, 2011 at 8:46am

Looks like a strong structure doing the frame like that. I posted about doing an octo like this. Nobody had a reason why it wouldn't work, while we wait for I2C support so it's good to see it's working.

 

Do you think it would do ok with 5000mAh 3S?

Comment by mahmood on January 24, 2011 at 9:01am

simple and practical design

 

Comment by Markus Jahn on January 24, 2011 at 11:51am

APM is connected to ESCs with a Y-cable. If one motor or ESC fails it shouldn't cause any trouble to others functionality. I will have to test if the Octo still stays airborne. In theory it should survive a motor failure.

One thing that is also part of the design is that all four beams/bar/whatever are detachable quite easily. This should help repairing them after crashes because I don't have take everything to pieces. Also the center piece which contains APM+IMU, GPS and receiver can be taken easily to table for repairs/troubleshooting.

After flying about an hour with the copter I can say it is comparable to the Mikrokopter Okto which costs five times the price of this one. And if you want officially use their copter for commercial purposes you will have to pay extra 600 euros for that too.

I think it would fly nicely with 3-cell batteries. But you should then buy higher kv motors to keep the power level the same.

Comment by Ground Loop on January 24, 2011 at 12:05pm

Very nice!  I would name it "Hashcopter".   Or even... Octothorpe :)

 

I'd be curious to see a close-up of the motor mounts.  Is it just the two screws straight through?

 

Are each of the motor pairs just coupled together (same signal to two ESCs)?

 

This seems very practical for heavy-lifting.  Would it extend to 9?

 

 

Comment by Alex Lee on January 24, 2011 at 1:55pm
Question for all: Where's everyone getting the 1/2 inch .5mm square tubing? My local shop doesn't carry it, nor the big box stores.. I've found 3/4 inch "thicker walled" but it seems over kill. I've also ran across some 1/2 inch "U" as well. it seems ok but it torque a little to easy.
Comment by Renato Aranghelovici on January 24, 2011 at 2:09pm

I doubt 0.5mm wall tubing can resist to such load and forces.

Will use 10*10mm 1mm wall and it is the minimum I could think for this task.

 

Markus, what is the length of the bars ?

Comment by steve F11music.com on January 24, 2011 at 2:49pm
Anyone have a source in the US for 1mm x 10mm x 10mm x whatever :)
Comment by squawk on January 24, 2011 at 10:36pm
Comment by Markus Jahn on January 24, 2011 at 10:50pm

Hashcopter feels like it is going to stick as a name for this one. :-)

Square tube used is 15mm x 15mm with 1mm wall thickness. I think when putting wires and bolts through tubing the extra room is really needed. When comparing the weight of 10mm or 15mm tubing it is almost insignificant as most of the weight comes from motors, ESCs, wiring and battery anyway.

Bars are 80cm long and motors are bolted straight through the top part of the tube(big holes below to get the screws through) with two screws.

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