On 6-Jun-2005, Chuck wrote:

I'll bet Vaughn is right on this one. My '63 Cherokee 180 POH is all
MPG instead of KPH. I thought that most companies had switched
totally to KPH by about 1970, but I recently checked out in a '76
Arrow and the POH on it was also full of MPG instead of KPH.

I think you mean MPH (miles per hour) and kts (knots), not MPG (miles per
gallon?) and KPH (kilometers per hour).



Oh, and remember -- there are things that can be done to modify those
stall speed numbers. Putting on newer design "Horner" style wing tips
and stabilator tips will drop stall speed about three to five MPH.
Vortex generators on the wing top just behind the leading edge can
drop stall another MPH or two. Flap & aileron seals can make a
difference. Fairings on the flap extension actuators help. Wing root
seals/fairings help. Wheel pants are a BIG help. Etc...

In order to lower stall speed for a given weight, all else being equal, you
need to change the wing's lift coefficient at stalling speed. Thus different
wing tips may help lower stall speed a tiny bit. Vortex generators may help
more. Mods that provide drag reduction (fairings, wheel pants, etc.) should
have NO effect on stall speed. Changing the lift coefficient of the horiz.
stab. will likewise have NO effect because it does not stall before the wing
(except in canard designs).

From my reading, you can actually get your stall speed down almost
10MPH by putting on every gizmo kit STC'ed for a Warrior. And at the
same time, you'll be adding top end speed to the plane as you smooth
out the airflow. Problem is -- you'll spend a fortune doing it !!!

That is, if you believe all the hype from the people trying to sell these
mods.

--
-Elliott Drucker