>> Perry just as a matter of interest please try a forward slip at high
    >>> altitude and
    >>> tell us what happens. For example is the canard stable or
    >>> does it buck in yaw or pitch? I am curious. The C 172 with full
    >>> flaps pitch bucks a little bit in a forward slip.
    >>>
    >>> Paul Lamar
    >>
    >>
    >> All Cessna's that I've flown do this..  I think you'll find that
   most
    >> [if
    >> not all] Cessna singles [ other than the 208 which I've not flown]
    >> are not
    >> approved for slip's w/ full flaps. I used to get into a divergently
    >> unstable pitch situation all the time w/ a 182 when flying
    >> skydivers.. it
    >> was controllable when you were expecting it.. when you weren't [
   the
    >> first
    >> few times it happened] it got your heart pumping..  Mind you.. these
    >> where
    >> Max rudder on a straight tail 182, w/ enough bank to keep the
   heading
    >> straight and then forward pitch until you reached Vfe and hold it
    >> there..
    >> w/ about 17inch MAP.  Used to go from 2000 asl to 12000 and back to
    >> 2000[surface] in 18 minutes.. The other way to do it was Vne and no
    >> flaps
    >> and 17"MAP..  but in the summer bump's you'd lose sight of the wing
    >> tip's
    >> during the bumps.. not a really secure feeling.. We got paid by the
    >> trip so
    >> the faster the better.. :-) 27 trips in 1 day was enough to wear
   ya out
    >>
    >> Jarrett
    >>
    >>
    >> Why do you think they are not approved for slips Jarrett?
    >> Was it the pitch buck or was it some other reason?
    >>
    >> I have always known that but it does not bother me to do them
    >> anyway in my angled tail 182. As far as I can tell it does not
    >> pitch buck like a 172. Maybe I am doing them wrong :)
    >>
    >> Of course you can run out of gas as all the gas tends to
    >> flow to the lower wing when the tank selector is on both.
    >> But then again you are landing usually so you should not care
    >> if the engine quits. Never the less I set the selector to the
    >> upper wing. There is a scenario where someone may pull out on
    >> the runway at the last minute.
    >>
    >> Paul Lamar ...No rotor no motor.
    >
    >
    > I really couldn't say Paul, it could be for either of those
   reasons, I
    > would tend to think that most people wouldn't do a slip for
   minutes on
    > end
    > so the fuel starvation is then less of a concern, the instability in
    > pitch
    > is a bit more of an attention getter. Cessna's are ok for
   slipping w/ the
    > flap's up so...  most likely its the pitch issue w/ using
   flaps.  [ I'm
    > guessin']
    >
    > Jarrett
    >
    >
    >
    > I have always been curious about this and I never found anybody
    > that knew the reason. A lot of new instructors get freaked
    > out when they do my bi annuals and I slip it in :)
    >
    > Paul Lamar ...No rotor no motor.


   I think the Cessna prohibition against slips with flaps is related to
   the Fowler flap mechanism not being designed for the lateral aerodynamic
   load created by a slip.  I was unaware of the pitch instability issue.
   I suppose I've not slipped  my '69 C150 J through enough altitude to
   experience the instability.

   Aubrey



I used to slip my C150M with partial flaps all the time.  We have a
couple of fields out here with power lines & I made a habit of dragging
in high & then slipping down to short final.  Couldn't use full flaps up
here in our DAs, so I can't comment on behavior at 40-degrees, but at
30-degrees it was tame as you could ever ask for -- as Jerry mentioned
in his response.  Pitch was rock-stable for me.

Mark Supinski


I am going to get your engine out this week Mark come hell
or high water. Last week was too hectic.