Author Topic: Rollovers?  (Read 608 times)

Offline Lintewathion

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Rollovers?
« on: July 06, 2006, 04:49:25 PM »
Every once in a while on takeoff ill leave the ground(i generally move the stick before i move to turn off autotakeoff) in a combat situation usually and ill roll one way to turn   and my plane will literally begin rolling wildly and nosediving. i can regain control usually but being so close to the ground tends to make that impossible as it usually takes me somewhere on the neighborhood of 1000 ft of falling to regain control(guessing on the distance)

it tends to happen low to the ground nearly 3 times as often as it does higher up and usually only happens soon after takeoff ( like when a vulcher forces an early liftoff on the bare minimum speed you can lift at) or when im forced to turn rapidly.


my question is what causes this? my theories on it include low speed, low alt, and possibly im just missing some important step in turning( although the fact that it rarely happens higher up tells me otherwise)

Offline Murdr

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Rollovers?
« Reply #1 on: July 06, 2006, 05:17:53 PM »
It sounds to me like you are stalling one wing first.  If one wing stalls while the other is producing lift, it puts you into a snaproll.  This is likely to happen when coordinating inputs (combining elevator, aeliron, or rudder input), but too much elevator input while even slightly banked, can also cause this to happen.  Keep in mind that when you increase bank angle, you also increase your potential stall speed.  One thing you can do to lower your stall speed is to deploy flaps, and retract them as your speed increases.  

While this is most common at speeds near stall, it is also possible to induce a similar stall at higher speeds with an accelerated stall.

Offline Lintewathion

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Rollovers?
« Reply #2 on: July 06, 2006, 10:13:03 PM »
i think your right, as i do tend to bank pull up and rudderize  in unison  a lot

Offline Target2

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Rollovers?
« Reply #3 on: July 07, 2006, 02:17:44 PM »
Try not to do anything too extreme until you build some air speed. If your being vulched, then drop flaps and cross your fingers. If you have some time try to extend out to gain air speed and alt before engaging.
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Offline Schatzi

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Rollovers?
« Reply #4 on: July 07, 2006, 02:26:51 PM »
In that regard you also have to consider the plane youre in. There are some like Pony and 109s (and many others!) that need a little speed to maneuver, they are hard control at low speeds right after takeoff.

And then there are the planes that can basically fight "of the runway", like the a6m or the Hurricanes. Those planes have a generally low stall speed and handle well at the lower edge of their envelope.
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Offline StarOfAfrica2

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Rollovers?
« Reply #5 on: July 07, 2006, 04:48:58 PM »
Then too you have torque to figure on, which is worse in some planes than others (the 109 comes to mind).

Offline ridley1

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Rollovers?
« Reply #6 on: July 09, 2006, 08:37:37 AM »
Engine torque....causes aircraft to twist.......

Air turbulence from the prop.....corkscrews around the fuselage and hits the rudder on one side.....causing the plane to yaw.....

P-factor....the decending side of the prop takes a bigger bite of air than the ascending side on take off.....again causing yaw.

These effects are always there....just more pronounced at take off.

AH has produced a pretty accurate flight model.