Physics Project Help (RC Hobbyists and Engineers)

Discussion in 'Community Discussion' started by ddrueckhammer, Apr 10, 2006.

  1. ddrueckhammer macrumors 65816

    ddrueckhammer

    Joined:
    Aug 8, 2004
    Location:
    America's Wang
    #1
    For my Physics 2 class, we were asked to create a self propelled gondola that would traverse a 3/16” total diameter rubber insulated wire across a 70’ span approximately 20’ above the ground. Below is a link to my website with further information, schematics, and pictures of the project.

    http://web.mac.com/ddrueckhammer/iWeb/Site/Mono Wire Racer Project.html

    I have designed an aluminum enclosure and wired my batteries so that my motor is at max capacity. (18 V, 2.4 A, 18000 RPM w/ load). I haven't weighed it yet but I think my total weight is under 1 pound. Unfortunately, I am restricted to Alkaline batteries so the weight can't be cut significantly without cutting power to the motor.

    I am getting a propeller adaptor so that my 2mm shaft can fit bigger props. My questions are:

    Can anyone recommend an RC Airplane or Hobbyist forum where I can get some help?

    Would I benefit from using a front mounted gear-box on my motor? I think that this would cut the RPMs but add more torque. What are the benefits in general for gear-boxes?

    What sort of prop should I be using? From the little research I have done, it looks like a 7-9 inch pusher prop would be good but I'm not sure whether a flat pitch or a deeper pitch is appropriate. Also, would I benefit from using a 3 or 4 blade prop?

    My max lwh is 25cm x 15 cm x 25 cm and my max wight is 2.2 lbs.
    I am limited to a max of 2 motors and only ones available through Radio Shack.
    And my max voltage is 18 V from Alkaline batteries.
     
  2. superbovine macrumors 68030

    superbovine

    Joined:
    Nov 7, 2003
    #2
  3. Takumi macrumors regular

    Joined:
    Dec 15, 2005
    Location:
    Gunma, Japan
    #3
    Might I recomend a soda canister charged rocket

    takumi
     
  4. Zeke macrumors 6502

    Joined:
    Oct 5, 2002
    Location:
    Greenville, SC
    #4
    Or to be even less helpful...you could make a 'cotton rocket.'

    Liquid nitrogen (cheaper than bottled water) can be used for this. Blow up a balloon and drop it into liquid nitrogen. The oxygen will condense into a cool blue liquid. Pack cotton into a cardboard tube. Pour the liquid oxygen from the balloon into the cotton. Strap the tube down strongly...apply flame and stand back.

    P.S. I recommend a long fuse or something to get you far away when the thing goes...lots of power.

    P.P.S. I don't actually recommend doing this...it's just so freaking cool.
     
  5. ddrueckhammer thread starter macrumors 65816

    ddrueckhammer

    Joined:
    Aug 8, 2004
    Location:
    America's Wang
    #5
    Wow thanks for the great link!
     
  6. steelphantom macrumors 6502a

    steelphantom

    Joined:
    Oct 15, 2005
    #6
    RC Universe is a pretty good RC forum. The folks there might be able to help you out with your project.
     
  7. ddrueckhammer thread starter macrumors 65816

    ddrueckhammer

    Joined:
    Aug 8, 2004
    Location:
    America's Wang
    #7
    Thanks for the replies. I finished my project and got an A on it. My design finished third out of a feild of eight. Pictures, schematics, and information about the project is located on my website at:

    Mono Wire Racer Project

    Thanks again for your help!
     

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