fll2993
Topic Author
Posts: 78
Joined: Wed Oct 18, 2006 5:22 am

### How Much Space Does A Sea Plane Need To Takeoff?

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/

MCOflyer
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Joined: Tue Jun 13, 2006 5:51 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

My guess is 800ft depending on conditions.

MCOflyer
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AirTranTUS
Posts: 3313
Joined: Tue Jun 21, 2005 9:12 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

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

Bobster2
Posts: 1523
Joined: Mon Jan 17, 2005 3:04 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 Quoting Fll2993 (Thread starter):how much water

937,500 gallons.

"I tell you this, no eternal reward will forgive us now for wasting the dawn." Jim Morrison

113312
Posts: 645
Joined: Sat Apr 16, 2005 9:09 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

Depends upon weight, wind, and type of aircraft.

David L
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Joined: Tue May 18, 1999 2:26 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

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

Starlionblue
Posts: 17830
Joined: Fri Feb 27, 2004 9:54 pm

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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." - John Ringo

KELPkid
Posts: 5247
Joined: Wed Nov 02, 2005 5:33 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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

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 :-)

Bobster2
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Joined: Mon Jan 17, 2005 3:04 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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.

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.
"I tell you this, no eternal reward will forgive us now for wasting the dawn." Jim Morrison

SlamClick
Posts: 9576
Joined: Sun Nov 23, 2003 7:09 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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

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.

ElpinDAB
Posts: 442
Joined: Sun Apr 17, 2005 7:00 am

### RE: How Much Space Does A Sea Plane Need To Takeof

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.)

lehpron
Posts: 6846
Joined: Tue Jul 10, 2001 3:42 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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?
The meaning of life is curiosity; we were put on this planet to explore opportunities.

David L
Posts: 8550
Joined: Tue May 18, 1999 2:26 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

 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.

Bobster2
Posts: 1523
Joined: Mon Jan 17, 2005 3:04 am

### RE: How Much Space Does A Sea Plane Need To Takeoff?

Hang some fishhooks off the pontoons and wait for a tug. Does FSX have fish? Maybe you could try it.
"I tell you this, no eternal reward will forgive us now for wasting the dawn." Jim Morrison

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