Thera tube vacumed?

Discussion in 'General Slingshot Discussions' started by ABH, Feb 8, 2013.

  1. ABH

    ABH New Member

    113
    0
    0
    Thera tube has air inside, but I was thinking that perhaps if this tubes wherent hollow and where vacumed.... could they go faster with no air inside? Is that I dont know for wat do you need air indide it just makes it a little havier and makes it less dense and aerodinamic
     
  2. slingpit

    slingpit Slingshot addicted

    1,606
    1
    0
    This is what i thought about to play with a medium inside the tube.<br>Look <a href="http://theslingshotforum.forumotion.com/t2809-silly-idea" class="postlink">here.</a>
     

  3. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    Lol, we just had a topic about this and the only thing that came out there was. who is man enough try?
     
  4. slingpit

    slingpit Slingshot addicted

    1,606
    1
    0
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>onnod wrote:</b></span></td></tr>
    <tr><td class="quote">Lol, we just had a topic about this and the only thing that came out there was. who is man enough try?</td></tr>
    </table>
    <span class="postbody"><br>I tried it out with presure. The tubes are a little bit heavier to draw. And it feels like a little bit more speed.I think the rubber is faster in the expansion with the force of the presure<br>But it´s only a feeling.</span>
     
  5. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
  6. slingpit

    slingpit Slingshot addicted

    1,606
    1
    0
    With a vacuum i´ll try tomorow.<br>Of course it will change the behavior of the tubes.
     
  7. ABH

    ABH New Member

    113
    0
    0
    We should test that against a chrony...
     
  8. ABH

    ABH New Member

    113
    0
    0
    I have a good idea, wat if... you turn the tubes into sort of pipes with hot air indide? They will be lighter and as joerg prooved, faster by the thermal ene<br>rgy... I have to make a planing....
     
  9. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    Sounds like a plan
     
  10. JoergS

    JoergS Administrator

    5,803
    107
    63
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>ABH wrote:</b></span></td></tr>
    <tr><td class="quote">I have a good idea, wat if... you turn the tubes into sort of pipes with hot air indide? They will be lighter and as joerg prooved, faster by the thermal ene<br>rgy... I have to make a planing....</td></tr>
    </table>
    <span class="postbody"><br><br>Faster, yes. Lighter, no. <br><br>The warmer the bands, the higher the draw force, the greater the force . Laws of physics.<br><br></span>
     
  11. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    They will be lighter, hot air is lighter than cold, just look at hot air boloons
     
  12. MaddyMax

    MaddyMax New Member

    1,015
    0
    0
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>onnod wrote:</b></span></td></tr>
    <tr><td class="quote">They will be lighter, hot air is lighter than cold, just look at hot air boloons</td></tr>
    </table>
    <span class="postbody"><br><br>this would probably only help if you're shooting upwards. the tubes would have the same mass, means the same inertia when shooting horizontal? that's just my theory. i was always poor in physics.</span>
     
  13. JoergS

    JoergS Administrator

    5,803
    107
    63
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>onnod wrote:</b></span></td></tr>
    <tr><td class="quote">They will be lighter, hot air is lighter than cold, just look at hot air boloons</td></tr>
    </table>
    <span class="postbody"><br><br>Ah, OK, you refer to the weight of the bands, I was referring to the draw weight. <br><br>Yes, there will be a small "air balloon" effect, but it will be hardly noticeable. <br><br>The effect on the draw weight will be very noticeable, depending on the temp of the environment. </span>
     
  14. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    Aha, that explains a lot, the draw weight difference will indeed be much bigger
     
  15. ABH

    ABH New Member

    113
    0
    0
    Yes I was also refering to overal weight, the main bas thing of this Im thinking of... Is that as a heater I will nrrd to usea some sort of candle, lighter or so... and logically this will eventually be consumed by fire,and wax candles are kind of messi as if the slingshot fells or moves a little the melting wax will make a mess inside and needs oxygen to burn and some sort of outside pipe for smoke ejection... so the best thing Im thinking is electrical heat as hot pannels with rechargable batteries but I dont have the required understeanding to make such a circuit...
     
  16. ABH

    ABH New Member

    113
    0
    0
    Does anyone know what Is the limit untill a rubberband burns??
     
  17. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    uhm, well, rubber is lit very easy with a lighter, but i think it will be able to take like a 100 C
     
  18. zwillie

    zwillie New Member

    865
    1
    0
    Hi,<br>nice idea.<br>I worked on the same and this is my result.<br><br><br>I used a valve from a bike and pressed the air with hand out of the tube.<br>A water suction pump works a bit better.<br><br>If you use the screw from the bike tube and mount it on the fork ends, you got a complete attachement. <br><br><img src="http://up.picr.de/13399700ym.jpg" border="0" alt=""><br><br><img src="http://up.picr.de/13399701vr.jpg" border="0" alt=""><br><br><img src="http://up.picr.de/13399702um.jpg" border="0" alt=""><br><br><img src="http://up.picr.de/13399703ef.jpg" border="0" alt=""><br><br><br><img src="http://up.picr.de/13399882ua.jpg" border="0" alt=""><br><br><img src="http://up.picr.de/13399883ye.jpg" border="0" alt=""><br>Haven`t made any speedtests yet.<br><br>Zwillie
     
  19. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
    looks good, looking forward to the tests
     
  20. ABH

    ABH New Member

    113
    0
    0
    Ok, looks how it should,please tell us the result in the speed test!