wanttaja@ssc-vax.UUCP (Ronald J Wanttaja) (09/22/85)
As an addendum to Jeff William's masterly treatise on 150/172 full flap
operations, may I offer the results of a just completed experiment?
Aircraft, 1965 Cessna 150E w/ straight tail, mechanical flaps, 150 lbs
under gross. With full flaps held aircraft in slip in either direction.
No controlability problem... no pitch excursions, just the normal
sloppiness you find at slow speeds. However, at about 45 mph indicated
(who knows what the actual was, with the pitot pointed sideways) there was
a slight buffet on the elevator that caused the wheel to pulse. Amplitude
about 1/2 to 3/4 inches, 2-3 hz rate. Might have been pre-stall buffet,
but went away at slightly lower speeds, and the horn never came on.
Added full power for a climb test. Was able to get 175-250 fpm rise, at,
as Jeff said, the bottom of the green arc. Engine is a little old (1450
hrs), but compression is still good (all>73 psi). At gross, I think I
would be able to get 100-200 fpm. Note that it would be impossible to
climb at "normal" speeds in this configuration... the nose would have to go
below the horizon.
I am a big fan of slipping, and one reget I have is that the 150 can't slip
as well as a Citabria. 150s seem to be rudder limited (even with the
straight tail), so that the slip attitude can only be slightly wing low.
After the experiment, I performed a slip to a landing with 40 deg of flaps
with no problems at all.
Ron Wanttaja
(ssc-vax!wanttaja)
"Batteries to power... turbines to speed..."