Today's Message Index:
----------------------
1. 11:52 AM - Side Sliping (Neil Henderson)
2. 01:02 PM - Re: Side Sliping (rv-9a-online)
3. 03:55 PM - Re: Side Sliping (Bill Repucci)
4. 07:08 PM - Re: Side Sliping (Dan Malwitz)
Message 1
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--> RV9-List message posted by: "Neil Henderson" <neil.mo51@btopenworld.com>
Listers
What's the general thinking re side slipping. I seem to recall a posting sugesting
this manouver should not be carried out with full flaps deployed. Input would
be most helpful in planning finals into short strips.
Neil Henderson RV9A G-CCZT
Message 2
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| Subject: | Re: Side Sliping |
--> RV9-List message posted by: rv-9a-online <rv-9a-online@telus.net>
In a 172, slips should be 'avoided' with flaps extended. This is
different than 'prohibited'. The reason I was told is that both flap
extension and slipping change the airflow over the elevator and pitch
authority is compromised. Doing both at the same time makes it worse.
That said, if you practice it and know how the aircraft responds, it
quite an effective maneuver. On a low wing aircraft, however, slipping
has it's own hazards... potential fuel starvation from the low wing, for
example.
Having said all that... who's got real-world experience with this?
Vern Little -9A
Neil Henderson wrote:
>--> RV9-List message posted by: "Neil Henderson" <neil.mo51@btopenworld.com>
>
>Listers
>
>What's the general thinking re side slipping. I seem to recall a posting sugesting
this manouver should not be carried out with full flaps deployed. Input would
be most helpful in planning finals into short strips.
>
>Neil Henderson RV9A G-CCZT
>
>
>
>
Message 3
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--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
I could be wrong here but I thought flaps in the early 172's w/ 40
degrees of flap were to be avoided. I used to slip a 1972 172 that our
club used to have all the time. The nose would bob up and down, nothing
bad, you just had to be aware of it. With 30 degrees, the plane
wouldn't do bob at all.
As for slipping an RV, I asked that question on www.vansairforce.net
forum and the reply was simple, don't worry, the RV's are great
slippers. My next question is, how is the -9 for spins?
Bill
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of rv-9a-online
Subject: Re: RV9-List: Side Sliping
--> RV9-List message posted by: rv-9a-online <rv-9a-online@telus.net>
In a 172, slips should be 'avoided' with flaps extended. This is
different than 'prohibited'. The reason I was told is that both flap
extension and slipping change the airflow over the elevator and pitch
authority is compromised. Doing both at the same time makes it worse.
That said, if you practice it and know how the aircraft responds, it
quite an effective maneuver. On a low wing aircraft, however, slipping
has it's own hazards... potential fuel starvation from the low wing, for
example.
Having said all that... who's got real-world experience with this?
Vern Little -9A
Neil Henderson wrote:
>--> RV9-List message posted by: "Neil Henderson"
>--> <neil.mo51@btopenworld.com>
>
>Listers
>
>What's the general thinking re side slipping. I seem to recall a
>posting sugesting this manouver should not be carried out with full
>flaps deployed. Input would be most helpful in planning finals into
>short strips.
>
>Neil Henderson RV9A G-CCZT
>
>
>
>
Message 4
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--> RV9-List message posted by: "Dan Malwitz" <dmalwitz@adelphia.net>
William D. Thompson describes this "pitch pumping" phenomenon in his book,
Cessna Wings for the World.
"When the larger dorsal fin was adopted in the 1972 C-172L, this side-slip
pitch phenomenon was eliminated, but the cautionary placard was retained.
In the higher powered C-172P and C-R172 the placard was applicable to a mild
'pumping' motion resulting from flap outboard-end vortex impingement on the
horizontal tail at some combinations of side-slip angle, power, and
airspeed."
Unless Vans says otherwise, I wouldn't worry about it in a low-wing
airplane. I think the flap outboard-end vortex in an RV misses the
horizontal stabilizer. [By the way, I've seen the flap outboard-end vortex
in a Boeing 757 during a misty landing and you don't want to be anywhere
near one, much worse than the wing-tip vortex.]
Regards,
Dan Malwitz
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of Bill Repucci
Subject: RE: RV9-List: Side Sliping
--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
I could be wrong here but I thought flaps in the early 172's w/ 40
degrees of flap were to be avoided. I used to slip a 1972 172 that our
club used to have all the time. The nose would bob up and down, nothing
bad, you just had to be aware of it. With 30 degrees, the plane
wouldn't do bob at all.
As for slipping an RV, I asked that question on www.vansairforce.net
forum and the reply was simple, don't worry, the RV's are great
slippers. My next question is, how is the -9 for spins?
Bill
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of rv-9a-online
Subject: Re: RV9-List: Side Sliping
--> RV9-List message posted by: rv-9a-online <rv-9a-online@telus.net>
In a 172, slips should be 'avoided' with flaps extended. This is
different than 'prohibited'. The reason I was told is that both flap
extension and slipping change the airflow over the elevator and pitch
authority is compromised. Doing both at the same time makes it worse.
That said, if you practice it and know how the aircraft responds, it
quite an effective maneuver. On a low wing aircraft, however, slipping
has it's own hazards... potential fuel starvation from the low wing, for
example.
Having said all that... who's got real-world experience with this?
Vern Little -9A
Neil Henderson wrote:
>--> RV9-List message posted by: "Neil Henderson"
>--> <neil.mo51@btopenworld.com>
>
>Listers
>
>What's the general thinking re side slipping. I seem to recall a
>posting sugesting this manouver should not be carried out with full
>flaps deployed. Input would be most helpful in planning finals into
>short strips.
>
>Neil Henderson RV9A G-CCZT
>
>
>
>
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