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How Much Space Does A Sea Plane Need To Takeoff?  
User currently offlineFll2993 From United States of America, joined Oct 2006, 87 posts, RR: 0
Posted (8 years 1 month 6 days 18 hours ago) and read 13704 times:

just out of curiosity i was wondering how much water or length it takes to have a plane like this takeoff??

http://www.airliners.net/open.file/1120257/M/

13 replies: All unread, jump to last
 
User currently offlineMCOflyer From United States of America, joined Jun 2006, 8690 posts, RR: 16
Reply 1, posted (8 years 1 month 6 days 18 hours ago) and read 13700 times:

My guess is 800ft depending on conditions.

MCOflyer



Never be afraid to stand up for who you are.
User currently offlineAirTranTUS From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 1 month 6 days 18 hours ago) and read 13679 times:

I was thinking your friend decided to get a float conversion for his 737 in case the runway was not long enough.  duck 

User currently offlineBobster2 From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 1 month 6 days 16 hours ago) and read 13625 times:

Quoting Fll2993 (Thread starter):
how much water

937,500 gallons.

 Smile


User currently offline113312 From United States of America, joined Apr 2005, 574 posts, RR: 1
Reply 4, posted (8 years 1 month 5 days 22 hours ago) and read 13512 times:

Depends upon weight, wind, and type of aircraft.

User currently offlineDavid L From United Kingdom, joined May 1999, 9533 posts, RR: 42
Reply 5, posted (8 years 1 month 5 days 20 hours ago) and read 13462 times:

Quoting Bobster2 (Reply 3):
937,500 gallons.

And that depends on whether you're taking off with or against the tide. Conveyor belt, anyone?  duck 


User currently onlineStarlionblue From Greenland, joined Feb 2004, 17108 posts, RR: 66
Reply 6, posted (8 years 1 month 5 days 20 hours ago) and read 13460 times:

Quoting David L (Reply 5):
Conveyor belt, anyone?

What if you have some birds flying around inside?



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineKELPkid From United States of America, joined Nov 2005, 6428 posts, RR: 3
Reply 7, posted (8 years 1 month 5 days 20 hours ago) and read 13449 times:

Quoting 113312 (Reply 4):
Depends upon weight, wind, and type of aircraft.

More than that. Depends on density altitude, crosswind component at takeoff, how the aircraft is loaded (in terms of where the CG is), and what type of takeoff the pilot is performing.

Note that the OP's picture is a Super Cub, which are, for the most part, extremely overpowered, however I'm sure being on floats erases most of the advantages Big grin

Also: it looks like the pilot is flying solo from the front seat(!). I thought Cubs had to be flown solo from the back seat due to CG considerations...



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineBobster2 From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 1 month 5 days 19 hours ago) and read 13442 times:

Quoting David L (Reply 5):
And that depends on whether you're taking off with or against the tide.

I estimated 937,500 gallons using a swimming pool calculator. No tide. Just a humongous pool.  Smile

I made the pool 5 feet deep so people could actually swim in it if they wanted. You could probably use less water if it's only for the airplane.  Smile


User currently offlineSlamClick From United States of America, joined exactly 11 years ago today! , 10062 posts, RR: 68
Reply 9, posted (8 years 1 month 5 days 19 hours ago) and read 13423 times:

Quoting Bobster2 (Reply 8):
You could probably use less water if it's only for the airplane.

1 gallon!

Here's how: Make a pair of V-shaped troughs fitted to the floats. Have a high-speed waterpump and distribution system. This system sprays water into the troughs just ahead of the floats, scavenges it from just behind them and redirects it to the next section just ahead. Repeat until airborne.

Back in the late sixties I watched one of these:

View Large View Medium
Click here for bigger photo!

Photo © Malcolm I H McCrow


conducting ops in Gatun Lake and Manzanillo Bay Panama. When they took off out of Manzanillo Bay from the old Panagra ramp, they angled toward the opening in the rompeolas, the breakwater at the Caribbean end of the Panama Canal. The reason was takeoff distance. From the back of the bay straight toward the breakwater was (according to GoogleEarth) about 9500' and they were not sure they could clear the 6 - 8 foot high concrete barrier. Angling out toward the opening they had about 16000' The performance was even worse in Gatun Lake because it is fresh water - less buoyancy.

Manzanillo Bay has seen a lot of flying boat ops. I've seen pictures of Consolidated Commodores and Sikorsky S-38 and S-43 flying boats from Panam, Panagra and Uraba-Medellin Airways. There was at least one Commodore at the bottom of the bay. Never did see a picture of a Martin 130 or Boeing 314 there though.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineElpinDAB From United States of America, joined Apr 2005, 485 posts, RR: 4
Reply 10, posted (8 years 1 month 5 days 19 hours ago) and read 13423 times:

I've flown an Aviat Husky on straight floats with 200hp (which is 50hp more than the Super Cub pictured here, but besides that, same wing and basically the same plane.) It had amazing performance....with 2 people and a full tank of gas, we lifted of the water within about 5 seconds of putting in full power. I don't know how many feet that would be though... (Much better performance than the 235hp Maule I've also flown). There's also a technique you can use called a confined area takeoff. With one of these, you step taxi around the lake until you apply full power to take off. Using this technique, you could probably take that Super Cub off on a lake that's so small it would scare you. (If you knew what you were doing, that is.)

User currently offlineLehpron From United States of America, joined Jul 2001, 7028 posts, RR: 21
Reply 11, posted (8 years 1 month 4 days 16 hours ago) and read 13320 times:

Quoting David L (Reply 5):
And that depends on whether you're taking off with or against the tide. Conveyor belt, anyone?

Would taking off in a river rapid mean your relative velocity to the water is zero?  Wink



The meaning of life is curiosity; we were put on this planet to explore opportunities.
User currently offlineDavid L From United Kingdom, joined May 1999, 9533 posts, RR: 42
Reply 12, posted (8 years 1 month 4 days 14 hours ago) and read 13306 times:

Quoting Lehpron (Reply 11):
Would taking off in a river rapid mean your relative velocity to the water is zero?

Exactly. You could "taxi-off" downstream. You might be pushed to do anything worthwhile if you head upstream, though.  Smile


User currently offlineBobster2 From , joined Dec 1969, posts, RR:
Reply 13, posted (8 years 1 month 4 days 14 hours ago) and read 13300 times:

Hang some fishhooks off the pontoons and wait for a tug. Does FSX have fish? Maybe you could try it. Big grin

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