U.S. CitiesCity-Data Forum Index
Covid-19 Information Page
Go Back   City-Data Forum > General Forums > Science and Technology
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Reply Start New Thread
 
Old 05-31-2020, 07:10 AM
 
9,053 posts, read 5,168,999 times
Reputation: 13672

Advertisements

Quote:
Originally Posted by otterhere View Post
It was sufficient to "float" dirigibles, and THEY had to weight a lot (at least the gondola and passengers it carried), or is hydrogen more powerful? Yes, I know the Hindenburg exploded, but that's another issue...
You CAN buy "balloon buddies" helium tanks cheaply; would it help to fill beach balls stuffed in the stern and bow? If not, I'll concede defeat.
Reply With Quote Quick reply to this message

 
Old 05-31-2020, 07:48 AM
 
7,945 posts, read 4,468,698 times
Reputation: 21337
Anything you add inside the boat is not going to increase it's capacity. Even Helium filled balloons. You'd need a big balloon to make a significant difference. Take a look at a the Goodyear Blimp. It's big.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 08:15 AM
 
Location: ATL -> HOU -> DAL -> ATL
4,756 posts, read 3,971,811 times
Reputation: 3874
Quote:
Originally Posted by tnff View Post
Anything you add inside the boat is not going to increase it's capacity. Even Helium filled balloons. You'd need a big balloon to make a significant difference. Take a look at a the Goodyear Blimp. It's big.
Exactly. There's a reason airplanes overtook airships/hot air balloons. The same level of lift but but incredibly slow. And I don't think helium is that cheap right now. I think best case scenario it'd be a wash compared to the price of just selling the small kayak and getting a larger one. And I'm not gonna recommend buying hydrogen. That stuff can be dangerous.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 08:48 AM
 
955 posts, read 247,880 times
Reputation: 2825
omg I'm weeping. and not from laughing.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 08:56 AM
 
9,053 posts, read 5,168,999 times
Reputation: 13672
Quote:
Originally Posted by KemBro71 View Post
omg I'm weeping. and not from laughing.
I warned you I was science-challenged.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 08:57 AM
 
955 posts, read 247,880 times
Reputation: 2825
Quote:
Originally Posted by otterhere View Post
You CAN buy "balloon buddies" helium tanks cheaply; would it help to fill beach balls stuffed in the stern and bow? If not, I'll concede defeat.
Concede it now.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 09:52 AM
 
Location: God's Gift to Mankind for flying anything
5,470 posts, read 11,631,135 times
Reputation: 4317
Quote:
Originally Posted by otterhere View Post
It was sufficient to "float" dirigibles, and THEY had to weight a lot (at least the gondola and passengers it carried), or is hydrogen more powerful? Yes, I know the Hindenburg exploded, but that's another issue...
Are we talking about a kayak the size of the Hindenburg?

Hydrogen is lighter than Helium, to answer that question...
But only about 8%...
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 02:25 PM
 
Location: Wooster, Ohio
1,331 posts, read 955,421 times
Reputation: 2013
Quote:
Originally Posted by otterhere View Post
You CAN buy "balloon buddies" helium tanks cheaply; would it help to fill beach balls stuffed in the stern and bow? If not, I'll concede defeat.
To lift 100 lbs, it would require 1449 cu ft; a 15.5 ft diameter balloon. See this link:
https://www.uu.edu/dept/physics/scie...s/2000July.cfm

$60, including tax, buys you a 14.9 cu ft tank of helium. So 1449 cu ft would require about 100 tanks, or $6000. Helium molecules are small and tend to leak, so you would probably have to refill your balloon with every trip of your kayak.

Except:

Helium has become so expensive that these 14.9 cu ft tanks now are only 80% helium. 80% helium is only capable of lifting the balloon; it is not capable of lifting a load. So your 15.5 ft diameter balloon filled with $6000 of 80% helium would simply bob in the wind.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 02:34 PM
 
955 posts, read 247,880 times
Reputation: 2825
Quote:
Originally Posted by mshultz View Post
To lift 100 lbs, it would require 1449 cu ft; a 15.5 ft diameter balloon. See this link:
https://www.uu.edu/dept/physics/scie...s/2000July.cfm

$60, including tax, buys you a 14.9 cu ft tank of helium. So 1449 cu ft would require about 100 tanks, or $6000. Helium molecules are small and tend to leak, so you would probably have to refill your balloon with every trip of your kayak.

Except:

Helium has become so expensive that these 14.9 cu ft tanks now are only 80% helium. 80% helium is only capable of lifting the balloon; it is not capable of lifting a load. So your 15.5 ft diameter balloon filled with $6000 of 80% helium would simply bob in the wind.
Thanks for this!

I wonder how large the balloon(s) would have to be for a kayak + heavy person. I'm thinking at least 300#.
Reply With Quote Quick reply to this message
 
Old 05-31-2020, 03:41 PM
 
Location: on the wind
10,645 posts, read 4,839,826 times
Reputation: 35446
In the immortal words of Roy Scheider:

"You're gonna need a bigger boat!"

Last edited by Parnassia; 05-31-2020 at 03:56 PM..
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology
Follow City-Data.com founder on our Forum or

All times are GMT -6.

© 2005-2020, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Contact Us - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 - Top