Running runup?

In article ,
Cub Driver wrote:


I fly from a turf field too. The only time the surface has ever been
an issue is when a 172 driver was taxiing too fast and dug up some
stones with his prop.

In a taildragger it wouldn't be a problem. I'm flying a 206, even on
grass you'll pick up some dirt/small stones that erode the prop. At $8K
a prop it just isn't worth it.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

I'm flying a 206, even on
grass you'll pick up some dirt/small stones that erode the prop.


is it really the prop that picks the stones up? Anybody studied the physics
involved?

Jose

--
(for Email, make the obvious changes in my address)

In article ,
(Teacherjh) wrote:



is it really the prop that picks the stones up? Anybody studied the physics
involved?

Watch an airplane during a runup with standing water on the surface.
Directly under the prop you'll see a little "mini tornado" of water
being picked up from the surface. If you happen to watch someone
foolish enough to do a runup over dirt/gravel you'll see the same
thing...but it will be dirt/dust/rocks in the tornado instead of water.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

On Wed, 30 Jun 2004 11:18:19 -0800, Dale wrote:

Watch an airplane during a runup with standing water on the surface.
Directly under the prop you'll see a little "mini tornado" of water
being picked up from the surface.

This is why I follow the newsgroups. You never can tell when you'll
pick up some priceless bit of information!

I look forward to my next visit to Alton Bay to see if it happens on
the lake. (Perhaps not, since the runups presumably are all running.)


all the best -- Dan Ford
email: (put Cubdriver in subject line)

The Warbird's Forum www.warbirdforum.com
The Piper Cub Forum www.pipercubforum.com
Viva Bush! weblog www.vivabush.org

On 7/1/04 4:40 AM, in article ,
"Cub Driver" wrote:

On Wed, 30 Jun 2004 11:18:19 -0800, Dale wrote:

Watch an airplane during a runup with standing water on the surface.
Directly under the prop you'll see a little "mini tornado" of water
being picked up from the surface.

This is why I follow the newsgroups. You never can tell when you'll
pick up some priceless bit of information!

The same thing is often seen below the engine inlets of airliners with low
wing-mounted engines (737s, and others) on wet taxiways.


--
Jack
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