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A comment on Wanted: Cofounder for YC S19. Robotic Tunnel Delivery of Groceries/food/packages. Parent comment

Re:Wanted: Cofounder for YC S19. Robotic Tunnel Delivery of ... by tuberelay on Monday February 11, 2019 @04:04AM (#19132997)
1) 700mm diameter - broken down vehicles should be shuntable, but a person could get in there reasonably easily.

2) helium blimps lift 1 gram per litre of helium, so to lift 10kg of groceries they would need a 10 cubic meter blimp or a 2.7 meter diameter sphere - seems big and difficult to control especially in winds.

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Re:Wanted: Cofounder for YC S19. Robotic Tunnel Delivery of ... by S4M on Monday February 11, 2019 @10:06AM (#19134928)
A person could get in a pipe of 700mm diameter? I seriously doubt it.
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Re:Wanted: Cofounder for YC S19. Robotic Tunnel Delivery of ... by lgregg on Monday February 11, 2019 @03:28PM (#19137966)
It's a tight fit but works. I would have to put one arm forward and one arm back to shift my shoulders for a torpedo tube (approx 21in or 533mm depending on nation). 700mm is another 6 inches. The average male's shoulder width is about 18 and go wide as 24 inches (often hard core weight lifters).

https://www.google.com/search?q=person+in+a+torpedo+tube&tbm...

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