Recent content by Evanish

  1. Evanish

    Misc. DIY - Replacing my bicycle tire with recycled plastic

    So here is an update. I decided to make mold the other tire like anorlunda suggested. I decided to make it out of masonry cement since I had some, and I thought would be sturdy enough. To start with I prepared some ground to work on. Here is a picture of the ground I leveled and the whole I...
  2. Evanish

    Is the world really better off without hydrogen airships?

    For random drone deliveries, rather then tons I was thinking in terms of things like washing machines, driers and a weeks worth of groceries. Something like a drone flying from a central hub to the delivery location, lowering the load down with a winch, flaring off the excess hydrogen...
  3. Evanish

    Misc. DIY - Replacing my bicycle tire with recycled plastic

    The cement thing is very likely a bad idea as even if I succeed in getting it in the resulting tire would likely be less than ideal. My hope was that the tuber tube, and old tire would, would encase the cement in such a way that even if it broke into many pieces the tire would still be fairly...
  4. Evanish

    Misc. DIY - Replacing my bicycle tire with recycled plastic

    I was thinking of using LDPE. The melting point is pretty low at 180-240 centigrade. I tried melting plastic bags with the heat gun, and it seems to work well enough so LDPE should be good. It's also not brittle. As for durability it will hopefully be good enough. Also, I picked up a big...
  5. Evanish

    Misc. DIY - Replacing my bicycle tire with recycled plastic

    I actually attempted filling the tire tube with something. After considering various options I decided to try filling the tire with cement. I purchased some masonry cement and put it through a strainer to get out the bigger rocks. Then I cut short the bicycle tire air valve so that I would...
  6. Evanish

    Misc. DIY - Replacing my bicycle tire with recycled plastic

    So the rubber on one of my bicycle tires has worn out to the point it needs to be replaced, and I was thinking I'd prefer a solid tire this time. Rather then buying one like a normal person I was thinking if I could make my own out of recycled plastic. Here is the plan as it currently...
  7. Evanish

    Is the world really better off without hydrogen airships?

    You're right. I did mean cubic meters. Thanks for the correction. Good point about the impurity levels. I hadn't considered that. Anyways I was on YouTube, and a channel I sometimes watch just came out with a video where he made a remote control hydrogen airship that I thought was a lot of fun...
  8. Evanish

    Is the world really better off without hydrogen airships?

    I've tried to find some information about the cost of the different items. Here is what I got. Helicopter: According to this, the Russian-built Mi-26 helicopter apparently is the biggest and can transport up to 44,000 (22 short tons) pounds of cargo. According to this info… So I think...
  9. Evanish

    Is the world really better off without hydrogen airships?

    I agree being aware of risk is very important. As for minimizing the damage I also think it's important to be aware of the price payed for every new additional safely, and then decide if it's worth it. I think this is best illustrated by thinking to the extreme. All the risks could be avoided...
  10. Evanish

    Is the world really better off without hydrogen airships?

    Good question. I'd say the best reason is it is cheaper, and more plentiful. I spent some time looking into how much cheaper. From these three sources I got this. Hydrogen Cost --- 0.7 $/kg Helium Cost --- 17 $/kg in 2013 Air Density --- 1.293 kg/m3 Helium Density --- 0.1785 kg/m3 Hydrogen...
  11. Evanish

    Is the world really better off without hydrogen airships?

    Correct me if I'm wrong, but don't we still transport large amounts of flammable substances around (e.g. oil, coal, ammonia fertilizers of various types, etc.). Are you saying we should stop doing this?
  12. Evanish

    Is the world really better off without hydrogen airships?

    This thread has been really interesting. After leaning more about it I don't think airships are likely to be able to compete against traditional freight options at their own game, but there may be a few niche applications where they could be useful. This would mostly be places where...
  13. Evanish

    Is the world really better off without hydrogen airships?

    Good point, I didn't really consider the whether that much. That's a pretty big thorn in the idea side.
  14. Evanish

    Is the world really better off without hydrogen airships?

    I don't know if they would be more cost effective. I guess that would depend a lot on how they where made, and any regulation involved. Edit: I've gotten some more information through google so I'd like to change my answer. As for energy efficiency...
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