gengrumpy(at)aol.com
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 Posted: Tue Aug 04, 2009 7:26 pm Post subject: Fwd: Forward Slips |
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Begin forwarded message:
| Quote: | From: Miller John <gengrumpy(at)aol.com (gengrumpy(at)aol.com)>
Date: August 4, 2009 10:24:28 PM CDT
To: Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)>
Subject: Re: RV10-List: Forward Slips
Over 4,000 hrs in single seat fighters, 1,700 in the A-7. Taught departure training for years. A-7 would depart at 400 kts (very violent, often tumbling end over end) or it would depart at 150 kts - very slow motion-like, with near vertical (down) nose position to start recovery. High speed departures (after tumbling) rarely had nose down more than 30 degrees or so.
Today, there was no "aggressive" rudder or elevator input - merely held what i had as airspeed bled off.
Slipped fighters all the time, even though we had speed brakes. With the swept wing fast movers, you ALWAYS kept the nose low and the speed up if you did a slip......
Don't think there's an airplane I've flown that I didn't routinely slip when needed......just keep the nose low!
On Aug 4, 2009, at 10:01 PM, Linn Walters wrote:
| Quote: | --> RV10-List message posted by: Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)>
Miller John wrote:
| Quote: | Depart means just that - the airplane "departs" from controlled flight - usually violently unlike a stall because it is often (but not always) induced by cross controls to start with. Longitudinal stability (controlled by the vertical stabilizer and rudder) is lost and the airplane then yaws followed by a rolling moment and possible tumbling (especially pronounced in swept wing aircraft). Straight wing aircraft usually snap roll rather than tumble. Which way it rolls depends on any roll input compounded by torque effects of the engine.
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Hmmm .... the airplane shouldn't snap roll unless the rudder and elevator is applied aggressively. Read "shouldn't" again. If one wing doesn't stall, then the snap roll doesn't occur.
| Quote: | Had I held my left slip controls in for a second or two longer in today, it would have snap rolled underneath with a forward pitching moment to boot. Impossible to recover from in the traffic pattern.
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I'm curious .... do you have the experience (I think you do)to try this at altitude? The fact that a common forward slip morphs into some other flight regime is troubling to me.
| Quote: | The loss of longitudinal stability is seen as yaw (if you're watching the ball - which I hope you are not when doing this maneuver). the Yaw is most quickly felt through the seat of the pants - going sideways in the seat.
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| Quote: | Whenever you get this feeling in the seat of your pants, your first response must be to release back stick pressure and neutralize ailerons and rudder. That will keep the departure from happening.
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| Quote: | Having to dig back a few years into my fighter pilot past for this.....
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The mental picture of an A7 in a slip causes me some chuckles. Did you really???
When I read the original poster of the rudder thread my thoughts were that the rudder was blanked by the wing somehow .... but I'd just have to be there. Interesting thread.
Linn
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