Author Topic: So the F4U's a super plane..  (Read 2818 times)

Offline Bodhi

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Re: So the F4U's a super plane..
« Reply #45 on: March 12, 2008, 12:20:46 PM »
Charge,
In game, the F4u will torque roll to the left if you push it too far. 
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Offline Charge

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Re: So the F4U's a super plane..
« Reply #46 on: March 13, 2008, 08:41:04 AM »
Yeah, Shuckins had the explanation in his post:

"Early Corsairs had a serious tendency to drop their left wing abruptly during a power-on stall during landing.  To correct this, Chance-Voung installed a leading edge strip, or spoiler on the right wing, just out-board of the "crank" or bend section.  This caused the right and left wings to stall at approximately the same time, but also increased the stall speed.  One Vought pilot is quoted in Francis Dean's AHT as stating, "I found the device had more of a psychological effect for apprehensive pilots than a positive cure for the unsymmetrical stall."

I didn't claim otherwise. I just speculated of what was the reason for such behavior from aerodynamic point of view. I may be wrong, of course -just wanted to discuss about the matter.

Does anybody know if there is any kind on built in wash-out in Corsair's wing?

-C+





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Offline F4UDOA

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Re: So the F4U's a super plane..
« Reply #47 on: March 13, 2008, 01:58:55 PM »
Quote
Does anybody know if there is any kind on built in wash-out in Corsair's wing?

From looking at the NACA stall test performed on the F4U two things are apparent.

1. The stall is a root stall not a tip stall.
2. The stall is caused by the rotation of the propellor and the airflow over the starboard wing root. Power off this A-Symetrical stall should not occur or be greatly reduced. It was at it's worst with flaps down at low speeds.

FYI The F4U did have some wing twist built in to the wing how much I have to research. Tip stallers are usually more tapered wing designs, the F4U had very rectangular wings typical of carrier aircraft of the time.

Offline Widewing

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Re: So the F4U's a super plane..
« Reply #48 on: March 13, 2008, 06:44:13 PM »

Does anybody know if there is any kind on built in wash-out in Corsair's wing?

-C+

Have a look at NACA Test Report 829 at: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930091906_1993091906.pdf

My regards,

Widewing
My regards,

Widewing

YGBSM. Retired Member of Aces High Trainer Corps, Past President of the DFC, retired from flying as Tredlite.

Offline Stoney

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Re: So the F4U's a super plane..
« Reply #49 on: March 13, 2008, 06:52:11 PM »
From looking at the NACA stall test performed on the F4U two things are apparent.

1. The stall is a root stall not a tip stall.
2. The stall is caused by the rotation of the propellor and the airflow over the starboard wing root. Power off this A-Symetrical stall should not occur or be greatly reduced. It was at it's worst with flaps down at low speeds.

FYI The F4U did have some wing twist built in to the wing how much I have to research. Tip stallers are usually more tapered wing designs, the F4U had very rectangular wings typical of carrier aircraft of the time.

NACA Report 829 shows no washout for the Corsair.  Angle of incidence at the root and tip both were set a 2 degrees.  As did almost all other WWII fighter designs, Vought used a great deal of airfoil taper--23018 root and 23009 at the tip.  Given the lower stall Rn of the 9 percent airfoil profile, the tip would stall before the root, all other things being equal.  I'll caveat that by saying that the absence of planform taper would reduce that tendency compared to most other contemporary designs.  You might be able to argue that the lack of washout would remove the advantage of the lack of planform taper, but without some sort of detailed analysis, it would be conjecture.  

Hmm, WW beat me to it. 
« Last Edit: March 13, 2008, 06:57:08 PM by Stoney »
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Offline StuB

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Re: So the F4U's a super plane..
« Reply #50 on: March 14, 2008, 03:36:57 PM »
I believe it. 

I started trying to learn the corsair last week.  I spent most of my AH time thjis past year flying the 109 K4.

The torque roll in the Hog has surprised me a few times.  The first was with gear down and flaps out.  I started sinking too quickly and mashed the throttle forward and it was all she wrote.  Rudder/aileron inputs seemed to do nothing to help me.

Another time I was low and slow, flaps out, looking for a GV to egg.  I mashed the throttle forward and promptly rolled right into the deck.

I have been working at smoothly rolling on the throttle and it has helped with keeping me from killing myself.  Now I have to work on keeping everyone else from killing me. :lol

Charge,
In game, the F4u will torque roll to the left if you push it too far. 
"Facing up to 200 Russians eager to have a nibble at you, or even Spitfires, can be quite enjoyable...but curve in against 70 Boeing Fortresses and all your past sins flash before your eyes."

Major Hans "Fips" Philipp
Geschwaderkommodore, JG 1
206 Victories. KIA 8 October, 1943

Offline Krusty

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Re: So the F4U's a super plane..
« Reply #51 on: March 14, 2008, 04:36:43 PM »
I'm never what you might call "gentle" on the throttle. I mash it on, off, however hard I want. I've never spun out from just increasing throttle. I DO notice the ball shift positions in some planes, and sometimes the nose turns a little, but I've never just instantly flipped over and crashed from throttle.


Not in this game.

Offline Bodhi

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Re: So the F4U's a super plane..
« Reply #52 on: March 14, 2008, 04:38:24 PM »
If you get slow enough in the Corsair and on the edge of uncoordinated flight, if you throttle up to fast, you will torque roll over.
I regret doing business with TD Computer Systems.

Offline StuB

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Re: So the F4U's a super plane..
« Reply #53 on: March 14, 2008, 10:28:53 PM »
It isn't instantaneous....but it happens at a point where you can't recover because without the power you will crash and with the power you will crash.  You are just screwed.

I'm never what you might call "gentle" on the throttle. I mash it on, off, however hard I want. I've never spun out from just increasing throttle. I DO notice the ball shift positions in some planes, and sometimes the nose turns a little, but I've never just instantly flipped over and crashed from throttle.


Not in this game.
"Facing up to 200 Russians eager to have a nibble at you, or even Spitfires, can be quite enjoyable...but curve in against 70 Boeing Fortresses and all your past sins flash before your eyes."

Major Hans "Fips" Philipp
Geschwaderkommodore, JG 1
206 Victories. KIA 8 October, 1943

Offline SgtPappy

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Re: So the F4U's a super plane..
« Reply #54 on: March 14, 2008, 10:53:29 PM »
If you get slow enough in the Corsair and on the edge of uncoordinated flight, if you throttle up to fast, you will torque roll over.

And try it without combat trim on... since the veteran Hog pilots lacked that special feature. I suppose you would find it much harder to not torque roll at very low speeds when you suddenly throttle up.
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Offline Bodhi

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Re: So the F4U's a super plane..
« Reply #55 on: March 14, 2008, 10:59:25 PM »
I never use combat trim.  I have all the trim mapped to my stick. 

I regret doing business with TD Computer Systems.