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Author Topic: Amphibious planes  (Read 393 times)

Offline uberhun

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Amphibious planes
« on: January 03, 2006, 04:44:50 PM »
Maybe we need to re - think this one:O
http://www.wimp.com/take/
« Last Edit: January 03, 2006, 04:47:26 PM by uberhun »
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Offline Hornet33

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Amphibious planes
« Reply #1 on: January 03, 2006, 06:28:46 PM »
That looked alot like one of Doobs' landings.:rofl
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Offline Tails

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« Reply #2 on: January 03, 2006, 09:28:46 PM »
Quote
Originally posted by Hornet33
That looked alot like one of Doobs' landings.:rofl


:huh

That grinding sound... That is NEVER a good sound on a recip... Because that is the sound of a reduction gear turning its internals into iron filings. That and the piston rods on that poor engine are now twisted into shapes that makes one think they were rubber.

What I want to know, is exactly what happened. Aborted takeoff without enough lake to slow down in? Hull wouldn't unstick from the water?
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Offline Treize69

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Amphibious planes
« Reply #3 on: January 03, 2006, 10:19:24 PM »
Trying to takeoff downwind instead of upwind? :)
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Offline SMIDSY

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Amphibious planes
« Reply #4 on: January 03, 2006, 10:52:04 PM »
simple problem that is inheirent in seaplanes: a small wave clipped one of the outrigger floats, causing it to lose lateral control. also, the pilot may have been inexperienced, compounding the problem.
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Offline HoHun

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« Reply #5 on: January 04, 2006, 04:13:43 PM »
Hi Smidsy,

>simple problem that is inheirent in seaplanes: a small wave clipped one of the outrigger floats, causing it to lose lateral control.

Hm, what does "clipped" mean here - the float did get submerged?

I wonder if the Dornier system with the stub wings instead of outrigger floats was one of the reasons for their praised seaworthiness? I'm not sure the stub wings would really help to eliminate the yaw effect visible in the clip.

Blohm & Voss had introduced "moment free" outrigger floats in the Bv 238. The were extended far above the water line so they couldn't be submerged, and tapered towards the top. The idea was that if a float was pushed into the water, its total drag (and thus the yawing moment applied to the aircraft) would stay constant because while the parasitic drag increased, the smaller waist at the water line would reduce wave drag by an equal amount.

Life seems to be difficult for sea plane designers :-)

Regards,

Henning (HoHun)
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Offline SMIDSY

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« Reply #6 on: January 04, 2006, 04:21:48 PM »
well the water resistance on a float causes uncontrolable yaw that usually results in a crash. this is one of the reasons you cant fly to japan via seaplane anymore.
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