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

I do on occasion when the situation warrants. But that's not very often.
Turning
a little sideways on the taxiway and just doing it really doesn't take that
long. Switches
and other checks can be done on the roll while taxiing.


"G. Burkhart" wrote in message
news:lk6Ec.1801$AI.68@attbi_s04...
When I did my training my CFI taught me to stop at the run-up area and
go through the run-up checklist. This was done at airports that had run-up
areas readily available. Fairly recently, I went with an instructor that
taught me to do a run-up during taxi on airports that don't have a run-up
area or require back taxi on the runway. Some of the local airstrips have
narrow (or no) taxiways and they lead right to the runway with little room
to stop to do a run-up so I've gotten into the habit of doing the run-up
while taxiing. I make sure to check outside to where I'm going while
checking the mag drops, etc. That way I'm ready for departure by the time
I
get to the runway, which is helpful when others are following behind me on
the taxiway, especially during fly-ins. Some airports require back taxi on
the runway from the ramp/taxiway and I'll do the (stopped) run-up before
getting on the runway or a run-up during the back taxi so I'm ready to go
when I turn around for departure.

Do you do 'running' run-ups?

"G. Burkhart" wrote in message news:lk6Ec.1801$AI.68@attbi_s04...
When I did my training my CFI taught me to stop at the run-up area and
go through the run-up checklist. This was done at airports that had run-up
areas readily available. Fairly recently, I went with an instructor that


In the sea plane we do them during take off. You never want to move
the throttle above idle for any reason other than take off because it
picks the water up and dings the prop. You have to reduce the number
of seconds you spend at non-idle throttle.

-Robert

On 6 Jul 2004 21:15:39 -0700, (Robert M. Gary) wrote:

You never want to move
the throttle above idle for any reason other than take off because it
picks the water up and dings the prop.

Aha! Now I really want to spend a few hours at Alton Bay (NH) and see
this phenom for myself.

(I've only ever been to Alton Bay in the winter, at least with respect
to airplanes. I mispent a lot of time there when I was in high school,
looking for the girls of summer.)

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

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