How to protect the central cross

Mirumod, Macgyver, hull, cam, propeller, leg, cross, ball bearing mods... etc.
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Apparition
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How to protect the central cross

Post by Apparition » 13 May 2012, 05:01

Reading about lots of times where the central cross structure has broken do to a to fast vertical landing (not a side fall), I was thinking the problem might be caused by inertia of the central Drone body, where the battery is located.

Why not adding a "central leg", near the vertical camera, but not obstructing it, as to provide a central support?

I was thinking on a short piece of black foam rubber hose, the one used to cover air conditioning pipe, glued to the body bottom.

The material would serve as a shock absorbing extra leg, preventing the cross arms flexing too much when the legs under each motor hit the ground, and battery wants to keep going down by inertia!

I am still waiting for my Drone to inspect it closely and check if my idea is of any value.

Anybody can have an opinion on it? :o

man_bites_dog
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How to protect the central cross

Post by man_bites_dog » 13 May 2012, 06:36

Already covered this here:

http://www.ardrone-flyers.com/forum/vie ... 917#p21497" onclick="window.open(this.href);return false;

Has saved my central cross many, many times already.

Cheers

Apparition
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Re: How to protect the central cross

Post by Apparition » 14 May 2012, 16:42

Thanks for response Man-bites_Dog :P !

I can see the idea is not bad and it offers a solution which works good for both a semi-lateral landing or a flat even fast landing.
But my idea goes in another direction. My thinking is, what causes the cross breakage is the inertia pushing down the CENTRAL case at impact time. Inertia forces the body to go farther than the cross legs, flexing the cross. Such fact makes me think, what has to be avoided is the gravity and inertia push down of the main body during landing. Hence, a shock absorber of some sort must be fitted also to the bottom of the main body case.
It might be a good idea to try a pair of the same cable ties, hooked in a crossed fashion bout going from leg to leg, UNDER the case, forming some sort of "helmet" bellow it.
Ill do some drawings on the idea, and when finally my drone is shipped I will also test it. Nevertheless I am getting redy to implement the sugested mod with the for ties, as it seems a great idea!

Parrot should pickup on the subject! :shock:

Mike

deanes
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Re: How to protect the central cross

Post by deanes » 15 May 2012, 00:08

When I was learning, I used these temporary "training wheels". They saved a lot of crosses, blades and shafts.
http://hop.tl/1RKvLZAePD2qy5tfxM
http://hop.tl/m0vnBNgdBGnvwgm6y2

Candu
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Re: How to protect the central cross

Post by Candu » 15 May 2012, 00:21

deanes wrote:When I was learning, I used these temporary "training wheels". They saved a lot of crosses, blades and shafts.
http://hop.tl/1RKvLZAePD2qy5tfxM
http://hop.tl/m0vnBNgdBGnvwgm6y2
Here's a video of my "training wheels" in action. I tried it after seeing seeing ro.bi's post somewhere in this forum. Note how it bounces back from the wall... I don't use that now but I am still using the cable tie.

http://www.youtube.com/watch?v=m2F9Zq1JuTc

deanes
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Re: How to protect the central cross

Post by deanes » 15 May 2012, 00:35

Here's a video of my "training wheels" in action. I tried it after seeing seeing ro.bi's post somewhere in this forum. Note how it bounces back from the wall... I don't use that now but I am still using the cable tie.

http://www.youtube.com/watch?v=m2F9Zq1JuTc[/quote]
Nice video! I stopped using them when I started flying outside. They tended to get hung up in trees and leaves.

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Re: How to protect the central cross

Post by Tizzy » 15 May 2012, 18:13

Apparition wrote:I was thinking on a short piece of black foam rubber hose, the one used to cover air conditioning pipe, glued to the body bottom.
Not a bad idea, will be trying this myself I think. Dimension wise it shouldn't weigh too much either so definitely worth trying.

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