Angle of prop shaft - theoretical question.
 

Ok, teach...... tell me about how a prop-powered space ship
works.....

I said nothing whatsoever about a prop-powered space ship. you did.

I did say that "action/reaction" -- as in either a rocket ship OR of a boat
prop -- means that neither "pushes" against anything at all. Than means that
thrust comes from the action/reaction of the prop and water NOT action of the
prop and reaction of the hull.

dumb, you are.

Angle of prop shaft - theoretical question.
 

gene, I am sure you don't realize it, but your post below states you believe
aircraft spiral left as they fly.

way to go, gene.

wait a minute. wasn't it you that claimed the alleged p-thrust was actually
spiral prop wash on the rudder?

Yup, that was you. So how come you are now telling us that making the
rudder
*bigger* would stop this alleged p-thrust?

dumb.


Jax your post is idiotic.



(2) The rudder is the only tool available to *counteract* the left
turning tendency (including "p-thrust") of the aircraft. The bigger
the rudder the more command available at slow speeds. Unless, of
course, JaxWorld pilots take off dragging the right brake....what do
they do when the main gear comes off the ground?
--
23' Grady White, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC is
located.
http://southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats at
Lee Yeaton's Bayguide

Angle of prop shaft - theoretical question.
 

gene, your comprehension of English is sadly lacking. you agreed with this
statement AND disagreed. You agreed by stating the spiral prop wash caused the
aircraft to turn (thus smaller rudder is better) and disagreed by stating that
a larger rudder will stop the spiral prop wash.

English does confuse you, doesn't it gene.

(1) Please cite the post where I said that a smaller rudder would stop
"p-thrust."

Angle of prop shaft - theoretical question.
 

gene? what word didn't you understand? prop wash, as rocket exhaust, does not
have to push against anything.

Ok, teach...... tell me about how a prop-powered space ship
works.....

I said nothing whatsoever about a prop-powered space ship. you did.

I did say that "action/reaction" -- as in either a rocket ship OR of a boat
prop -- means that neither "pushes" against anything at all. Than means
that
thrust comes from the action/reaction of the prop and water NOT action of
the
prop and reaction of the hull.

dumb, you are.


You said, and I quote, ".....the prop wash has not(sic) have to "push"
on anything but the prop, just like a rocket ship in space."

Here's your sign.
--
23' Grady White, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC is
located.
http://southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats at
Lee Yeaton's Bayguide

Angle of prop shaft - theoretical question.
 

JAXAshby wrote:
steve, bone up on "P-torque" or "P-thrust" or more accurately "asymetrical
thrust". It is a common problem for aircraft with "conventional" landing gear
(meaning two wheels up front and one on the tail), and has been fully
understood since the early days of WWII.

For christsakes, Jax, at least get the term correct, it's P-factor you
cretin.

Just for grins how about telling us all about your taildragger flying
experience. For a know-nothing wannabe you sure pump out a lot of
bull**** about stuff you obviously have no personal experience with.


Rick

Angle of prop shaft - theoretical question.
 

On 06 Jun 2004 17:11:03 GMT, (JAXAshby) wrote:

no matter how deep the prop, the water on the lower side
is still going to be under ambient higher pressure than the water on the
top.

the pressure difference due to water depth is inconsequential. The pressure
change is less than 0.5 pound per foot of depth. the compressibility of water
is near zero. even on a 15" prop, the center of effort difference between top
and bottom blades is less than about a foot. These ar truly miniscule forces
as compared to the force needed to move a multi-thousand pound boat in a
noticeable fashion.

While it's true that the pressure difference is tiny between the top and
bottom of the prop, it is there and does contribute a tiny amount so it
should be factored in along with everything else. One special case that
could occur as a rare condition is when there is cavitation at the top
of the prop and not at the bottom due to the pressure differential.

Steve

Angle of prop shaft - theoretical question.
 

Another wrong assumption, Jax.....


it was not an assumption, gene. it was a statement of fact.

Angle of prop shaft - theoretical question.
 

gene, learn English and then continue to post here.

From: "Gene Kearns"
Date: 6/6/2004 5:12 PM Eastern Standard Time
Message-id:

On 06 Jun 2004 20:54:30 GMT, (JAXAshby) wrote:

gene, your comprehension of English is sadly lacking. you agreed with this
statement AND disagreed. You agreed by stating the spiral prop wash caused
the
aircraft to turn (thus smaller rudder is better)

I never said rudder. I said, "....larger vertical surface areas on
the empennage...." The rudder is a mixed blessing, but is the only
control surface capable of offsetting the left turning tendency.....
sorry you are confused.

and disagreed by stating that
a larger rudder will stop the spiral prop wash.

English does confuse you, doesn't it gene.

(1) Please cite the post where I said that a smaller rudder would stop
"p-thrust."




Apparently, your confusion arises from the fact that you don't
understand the subtle differences between the terms "stop" and
"counteract." Here's a hint..... you aren't going to "stop" it as
long as you use one propeller per shaft.




--
23' Grady White, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC is
located.
http://southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats at
Lee Yeaton's Bayguide

Angle of prop shaft - theoretical question.
 

the original (and incorrect) term was "P-Torque". that was replaced (to some
extent) by the term "P-Thrust" as in asymetrical thrust due to the angling of
the disc of the prop relative to forward motion. "P-Factor" is now used by
idiots and for idiot who don't have a clew what is going on.

btw ricky, you must the only person on the planet who claims to have an Airline
Transport rating who doesn't know the difference between slots and slats.

steve, bone up on "P-torque" or "P-thrust" or more accurately "asymetrical
thrust". It is a common problem for aircraft with "conventional" landing
gear
(meaning two wheels up front and one on the tail), and has been fully
understood since the early days of WWII.

For christsakes, Jax, at least get the term correct, it's P-factor you
cretin.

Just for grins how about telling us all about your taildragger flying
experience. For a know-nothing wannabe you sure pump out a lot of
bull**** about stuff you obviously have no personal experience with.


Rick

Angle of prop shaft - theoretical question.
 

no, gene. the prop pushes against the water, NOT the prop wash. and yes you
did state that prop walk is due to the prop wash spiralling, and thus pushing
against god knows what.

dumb, gene, as in stupid on your part.

gene? what word didn't you understand? prop wash, as rocket exhaust, does
not
have to push against anything.



I saw no mention of..... rocket ... did you say that prop wash
does not have to push against anything?

I thought it pushed against the propeller...... oh.... are you
confused, again?




--
23' Grady White, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC is
located.
http://southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats at
Lee Yeaton's Bayguide