Flexacopter -----The Making of an octocopter "KRATOS"----- - Page 3 - RC Groups
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Jan 26, 2013, 02:56 PM
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Ruitech's Avatar
A DD gimbal, based on the Freefly 3 axis gimbal should not be a problem. I just hope they will make a upgrade version to replace the servo's for Direct Drive motor's & a control unit to drive them (like Alexmos)
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Jan 26, 2013, 06:19 PM
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holco's Avatar
work in progress





















Jan 27, 2013, 07:56 AM
Registered User
Looks like a really nice and tidy machine. So that dampening system actually runs through the top plates? All that wire can't be light though, have you weighed it yet?
Jan 30, 2013, 11:37 AM
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holco's Avatar
After testing a lot of motors we decided to go for a Plettenberg Orbit motor for our Kratos

Motor test for our new Flexacopter Kratos (8 min 45 sec)
Jan 30, 2013, 01:02 PM
vAMPire
Wow, what a monster at 10KW peak!

One question concerning the wire dampeners, do they only work properly on compression would they be also effective on tensile load?
Jan 30, 2013, 02:32 PM
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holco's Avatar
More like 1300W

Quote:
Originally Posted by Henni
Wow, what a monster at 10KW peak!

One question concerning the wire dampeners, do they only work properly on compression would they be also effective on tensile load?
Jan 30, 2013, 05:00 PM
vAMPire
I was assuming that you were going to use 8 of them in total ;-)

So what about the wire dampeners, secret information? Like the fact that they seem to be very effective yet very easy and cheap to make (not talking about the perfection u do)
Jan 30, 2013, 05:11 PM
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holco's Avatar
You right with 8 of them 10,4KW

Total lifting power 33,6kg

For sure no secret, google is your friend lots of information about wiredampers.

Quote:
Originally Posted by Henni
I was assuming that you were going to use 8 of them in total ;-)

So what about the wire dampeners, secret information? Like the fact that they seem to be very effective yet very easy and cheap to make (not talking about the perfection u do)
Jan 31, 2013, 12:27 AM
Will fly for food
ilektron's Avatar
I have to ask. Couldn't you get away with much smaller COTS wire-dampeners than custom machined ones? I recognize half the fun may be designing your own...
Jan 31, 2013, 02:01 AM
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holco's Avatar
The wiredampers on the Kratos are designed for lifting High-End Pro camera's in the range of 4>6kg, simple remove 4 of them and you are in the range of 1>3kg camera's, fine tuning is also possible by simple removing single wires with a 1.3mm hex driver, no glue is used with this dampers.

You can buy of the shelf wiredampers (also not cheap!!) but than you don't get the flexability we have now and it wil spoil the looks

Don't know what COTS means though


Quote:
Originally Posted by ilektron
I have to ask. Couldn't you get away with much smaller COTS wire-dampeners than custom machined ones? I recognize half the fun may be designing your own...
Jan 31, 2013, 02:12 AM
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topgearuk's Avatar
Which ESC's are you using? Look similar to YGE's
Jan 31, 2013, 02:21 AM
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holco's Avatar
That's our own water proof coated 32bit 6S-60A ESC with actif braking made by MGM.



Quote:
Originally Posted by topgearuk
Which ESC's are you using? Look similar to YGE's
Last edited by holco; Jan 31, 2013 at 02:27 AM.
Jan 31, 2013, 02:47 AM
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topgearuk's Avatar
Quote:
Originally Posted by holco
That's our own water proof coated 32bit 6S-60A ESC with actif braking made by MGM.

Very nice! I'm sure they will work great... Any reason you went with Active braking?
Jan 31, 2013, 03:04 AM
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holco's Avatar
Better rpm decreasing respons, especially with large prop's.

But with the software tool you simply can adjust it from 0>100

video#3 How to Program X-SERIES Speed Controller Using PC (2 min 20 sec)



Quote:
Originally Posted by topgearuk
Very nice! I'm sure they will work great... Any reason you went with Active braking?
Last edited by holco; Jan 31, 2013 at 03:09 AM.
Jan 31, 2013, 03:15 AM
Registered User
topgearuk's Avatar
Quote:
Originally Posted by holco
Better rpm decreasing respons, especially with large prop's.

But with the software tool you simply can adjust it from 0>100

http://www.youtube.com/watch?v=xB8sfhl1gmw
Makes total sense!

How's that wiring up coming a long? That's my favorite bit.. Lol


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