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Old Jan 16, 2014, 01:59 PM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Build Log
Trampoline Octo build

Yea it wanted a name and its about the same size as our trampoline



My ambitious goals:
Size
Stability
Redundancy
Power
Flight time
Portability

Some of these goals are conflicting so sacrifices will be made along the way.
Due to the cost of some of these parts I'll build it as a Quad first then Octofy it later.

Parts so far:
SkyKnight X8-1100 High Strength Carbon Fiber FPV Folding Octacopter Frame Kit(25mm Tube)
4x Tarot 25mm Motor Mount
8x Twill Carbon Fiber Tube 1000mm x 25mm x 23mm
8x Twill Carbon Fiber Tube 1000mm x 22mm x 20mm
2x T-Motor U-POWER U11 120KV

Parts ordered but not yet recived
Taranis X9D TX and some reciever
Tarot 980Pro Training vessel

Parts needed
6 more motors
4 sets of 28" T-Motor propellers
8 speed regulators (6-12s)
8 batteries (12s)
Flight controller (Ardupilot APM 2.6 Mega)
Navigational and misc LED's
A bunch of wires.
3mm CF plate for reinforcing bottom plate
3mm CF plate for reinforcing upper plate and provide additional support for the arms
23mm CF tube to insert in and reinforce the existing arms ?
Better and easier (toolless) locking mechanism for anrm and legs Foxtech Kraken or Tarot?
Dome for electronics.
A sack of money to pay for it.

By the looks of it the dimentions will be 217cm motor to motor
(Note that this is loosly mounted in a hurry for preview)


And as octo it will be 83cm between the arms


Some Nuts to Crack
Reinforce bottom plate so the arms does not come loose.
Add a large top plate with an waterproof dome for all electronics and extra mounts for the arms to help stabilize them.
Water proof dome will also keep it afloat in the event of a unwanted bath (Keep an eye out for the mew Foxtec dome)
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Last edited by RCG_Balthazar; Apr 14, 2014 at 04:04 PM. Reason: More parts ordered and received
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Old Jan 16, 2014, 08:35 PM
Happy Holidays
AnthonysQuad's Avatar
Joined Jan 2013
1,045 Posts
Big ideas are cool.
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Old Feb 14, 2014, 06:01 PM
flying ninja!
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Joined Jun 2011
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Hey Balth, sup!
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Old Mar 14, 2014, 04:00 AM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Hanging in here

Hey bro!
The build is very slowly getting started.
Yesterday the first two motors finally arrived, and they are big!
Here's a pic of one sitting next to a Hubsan Nano

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Old Mar 14, 2014, 08:03 AM
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Joined Apr 2013
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Nice. How long until you have all the parts together?
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Old Mar 14, 2014, 11:27 AM
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Canada, QC, Quebec
Joined Sep 2011
56 Posts
My guess is that the arms will vibrate and create resonance as they seem too long for that thickness.
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Old Mar 14, 2014, 05:31 PM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Time, resonance and FOV

Well I only have one job and top of the line parts are expensive!
Was hoping to get it airbourne by May but thats a Looong shot.

Yea I'm thinking a lot about reducing or preventing resonance and Jello.
Another potential problem with long arms is making the joints strong enough
to handle the awesome power of the U11.

Today I have been thinkig, studying the U11 and the motor mounts and
I've been fiddling with MS Paint again.

Whats been on my mind today is the camera field of view.
At some point in time there will be a gimballed Canon EOS 600D under it.
Filling half the picture with motors, arms and propellers isnt very cool..

Heres what I got on that so far:
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Old Mar 24, 2014, 09:47 AM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Ok slight change of plan again.
Ordered four more 25x23x1000mm outer tubes and eight 22x20x1000mm inner tubes.
Then I can glue rubber sheets, bands or gaskets on the inner tubes before inserting them
hoping it will help reduce vibrations and such.
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Old Apr 06, 2014, 01:47 AM
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216 Posts
Any updates on this project?
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Old Apr 06, 2014, 04:15 AM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Got the rest of the CF rods for the arms and are working on the battery dilemma.
Made a wooden dummy based on the numbers posted on the GensAce website
and asked for them to confirm on their facebook page.

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Old Apr 14, 2014, 03:40 AM
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I think it needs some more tubes between arms for anti-vibration of arm.
looking at your build the fantastic project.
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Old Apr 14, 2014, 04:06 AM
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Instead of changing the arm angles and making the wedges, what about switching to a coaxial octocopter design? (Four arms, with two motors per arm.)

You would lose some efficiency, but gain mostly everywhere else - camera visibility, portability, lower weight, stability in wind, etc.
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Old Apr 14, 2014, 03:24 PM
Really Crazy Gamers
Joined Jun 2013
21 Posts
That would almost double the strain on each arm and I'd have to start all over again.
Might do a x8 for fun some time though



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Old Apr 14, 2014, 03:45 PM
Really Crazy Gamers
Joined Jun 2013
21 Posts
Anti Vibration

Quote:
Originally Posted by caotri View Post
I think it needs some more tubes between arms for anti-vibration of arm.
looking at your build the fantastic project.
I gave that a lot of thought allready.
I was thinking maybe a ring half way up the arms, as well as a couple other
more or less clever things.

Having a battery hanging on some rubber damped plates will help a lot.
Also when designing the wedge/angle converter I might incorporate some
rubber layer to further dampen vibrations.

Remember it has to be kept easy to fold and unfold or it will not get used a lot.
Right now theres 8 fiddly little nuts to secure and thats allready too much
even on the living room floor.

Combining the Sky Knight hub you see in the picture with the wider Kraken
hub may provide a solution to both fiddly nuts and angled arms
in addition to providing a little extra support and strenght.
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