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Blog TrainingSphere - 6 - The frame
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  • Author Author: amgalbu
  • Date Created: 24 Jul 2015 11:25 AM Date Created
  • Views 1382 views
  • Likes 4 likes
  • Comments 11 comments
  • sci_fi_your_pi
  • training_sphere
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TrainingSphere - 6 - The frame

amgalbu
amgalbu
24 Jul 2015

The frame is almost completed

I encountered more difficulties than I expected in assembly a structure using steel wires...

 

image

image

 

It's not very clear in these pictures, but there are three "parallels" corresponding to three "levels"

On the upper level, the raspberry and the accelerometerers will be mounted

The middle level will host the two engines and propellers

The bottom level will host the control surfaces

At the bottom of the sphere (so outside the sphere) I will place the battery and the two servos that move the control surfaces

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Top Comments

  • amgalbu
    amgalbu over 10 years ago in reply to tomaja +2
    I expect the complete sphere to be about 700 grams. I used an online motor calculator to size engines and propellers for a thrust of 1.6 kg. I hope the calculator is precise enough!
  • fvan
    fvan over 10 years ago +1
    Nice frame, what's the weight like ?
  • amgalbu
    amgalbu over 10 years ago in reply to balearicdynamics +1
    Yes enrico you are right. One of the results iis that the sphere can bounce thus protecting electronic components and propellers. AAs far as i know carbon fiber has limited elasticity. It's stiffer and…
  • amgalbu
    amgalbu over 10 years ago in reply to tomaja

    I expect the complete sphere to be about 700 grams. I used an online motor calculator to size engines and propellers for a thrust of 1.6 kg. I hope  the calculator is precise enough!

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  • amgalbu
    amgalbu over 10 years ago in reply to balearicdynamics

    Yes enrico you are right. One of the results iis that the sphere can bounce thus protecting electronic components and propellers. AAs far as i know carbon fiber has limited elasticity. It's stiffer and lighter but in case  of shock it cracks.

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  • tomaja
    tomaja over 10 years ago in reply to amgalbu

    Nice frame!

    250g doesn't sound like too much but with battery, wiring, motors and electronics (ESC and flight controller) it can easily go near 1kg. This is still fine.

    You just need to make sure you have sufficient lift, and good resource for that is eCalc - the most reliable RC Calculator on the Web

     

    I really cant wait to see your sphere flying image

    Good luck!

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  • amgalbu
    amgalbu over 10 years ago in reply to fvan

    Hi fvan

    the frame current weight is 250 grams, but I still need to add control surfaces

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  • balearicdynamics
    balearicdynamics over 10 years ago in reply to ravi_butani

    Maybe, but with too much issues like: expensive, needs more complex nodes, less or identical flexibility. For a prototype this material is better. Also because this is a perimeter structure while - accordingly with the previous designs of Ambrogio - the core of the system is inside a tubular structure. So this is only for external shaping and protection. IMO

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