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Pitot Geometry

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kuffel(at)cyberport.net
Guest

Posted: Fri Feb 03, 2006 8:31 am Post subject: Pitot Geometry

Sorry, I forgot a topic line.



Bob Bean:



<<That same effect is what will make me reform the front of my handmade

aluminum nose cone.  At easy cruise and below the airspeed works ok.

If I crank it

up the nose tips down and the ASI starts doing a little dance.

The probe is located 15" back of the front and 3 1/4" standoff from the

bottom.>>



First you might try an old trick in reverse.  If your pitot tube is really

a tube, file the front at at angle to form a scoop.  For your case the

lower edge of the tube would be forward.



Filing the front of the tube with the upper edge forward has sometimes

helped with wing mounted pitots which had abnormally low indicated

airspeeds at stall.  Doing the opposite might help and certainly is easier

to try than a new nose cone.



Tom Kuffel

Whitefish, MT

Building Original FireStar

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Richard Pike

Joined: 09 Jan 2006
Posts: 1669
Location: Blountville, Tennessee

Posted: Fri Feb 03, 2006 8:55 am Post subject: Pitot Geometry

Move it about 15" forward and a bit down. If your pitot tube and static 

air openings are about even with the front of the nose bowl, and at 

least 6" below it, it will work perfectly.

Here is an example:

http://www.bcchapel.org/pages/0003/pg7.htm

Richard Pike

MKIII N420P (420ldPoops)



robert bean wrote:

 	  Quote: 	
		   



 That same effect is what will make me reform the front of my handmade

 aluminum nose cone.  At easy cruise and below the airspeed works ok.  

 If I crank it

 up the nose tips down and the ASI starts doing a little dance.

 The probe is located 15" back of the front and 3 1/4" standoff from the 

 bottom.

 The air should be linear at that point, fast or slow.



 Eventually I may know how fast I'm going.

 -BB

 On 3, Feb 2006, at 2:26 AM, kuffel(at)cyberport.net wrote:



   

> 

>

> DVD asks:

>

> <<don't need the "tube" because the bulkhead fitting is forward of the

> nose about 7/8" and should be in undisturbed air?>>

>

> As in most things aeronautic, "not exactly".  7/8" in front of the 

> wing or

> nose cone the air is relatively undisturbed *relative to the surface*. 

>  In

> other words, almost static.  Unfortunately, what you need to measure is

> air undisturbed relative to the ground (+/- wind of course).  The 

> general

> rule is to reach such air you should be as far away from the nearest

> surface as the radius of curvature of that surface.

>

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

slyck(at)frontiernet.net
Guest

Posted: Fri Feb 03, 2006 12:22 pm Post subject: Pitot Geometry

Thanks guys, all good food for contemplation.  My nose cone front end

is a hole plugged with blue foam, coated with glass and epoxy.

It has been redone with my big grinder once before.

I made my pitot from a piece of very thinwall stainless tube figuring

the shear effect would possibly give me more accuracy.  Pretty tough

to bend without a wrinkle.  Just fanciful thinking on my part,

but scrap is cheap.

I would like to get it up where its safe though, I have a tendency to

go where no man has gone before.  (the brush)

-BB  do not archive

On 3, Feb 2006, at 11:53 AM, Richard Pike wrote:



 	  Quote: 	
		   



 Move it about 15" forward and a bit down. If your pitot tube and static

 air openings are about even with the front of the nose bowl, and at

 least 6" below it, it will work perfectly.

 Here is an example:

 http://www.bcchapel.org/pages/0003/pg7.htm

 Richard Pike

 MKIII N420P (420ldPoops)



 robert bean wrote:

> 

>

> That same effect is what will make me reform the front of my handmade

> aluminum nose cone.  At easy cruise and below the airspeed works ok.

> If I crank it

> up the nose tips down and the ASI starts doing a little dance.

> The probe is located 15" back of the front and 3 1/4" standoff from 

> the

> bottom.

> The air should be linear at that point, fast or slow.

>

> Eventually I may know how fast I'm going.

> -BB

> On 3, Feb 2006, at 2:26 AM, kuffel(at)cyberport.net wrote:

>> 

>>

>> DVD asks:

>>

>> <<don't need the "tube" because the bulkhead fitting is forward of 

>> the

>> nose about 7/8" and should be in undisturbed air?>>

>>

>> As in most things aeronautic, "not exactly".  7/8" in front of the

>> wing or

>> nose cone the air is relatively undisturbed *relative to the 

>> surface*.

>>  In

>> other words, almost static.  Unfortunately, what you need to measure 

>> is

>> air undisturbed relative to the ground (+/- wind of course).  The

>> general

>> rule is to reach such air you should be as far away from the nearest

>> surface as the radius of curvature of that surface.

>>

>>

>>

>>

>>

>>

>>

>>

>>

>

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Feb 03, 2006 4:53 pm Post subject: Re: Pitot Geometry

 	  Quote: 	
		  I would like to get it up where its safe though, I have a tendency to 

go where no man has gone before. (the brush) 	




Hi Bob:  You did not clarify if that excursion to the brush was controlled, intentional, or uncontrolled and unintentional.



john h

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

flht99reh(at)netzero.net
Guest

Posted: Fri Feb 03, 2006 6:35 pm Post subject: Pitot Geometry

John, the question you asked below reminded me of an instructor in a

Salesman course on successful salesmanship (I believe for those that care

that it was the Larry Wilson Salesmanship Course). He said there are four

categories of salesmen (or for that matter, any area of interest): The

highest is the conscious competent. This one is aware that there successful

and why. Then there is the unconscious competent. This one, he says, has no

idea why they are successful. Then the third: the conscious incompetent.

This individual is aware of why they are not successful. Then the last: the

unconscious incompetent. He or she, has no idea why or the fact that they

are unsuccessful. 



I was, for a great deal of my career, an unconscious competent. I had the

way to sell refrigerators to Eskimo's; I just never understood why they

bought from me. Now over my life I have graduated to being the conscious

incompetent. I know that I know that I am a complete, in every way failure.

But soon, I hope to acquire that happy medium most elderly men achieve: the

full blown unconscious incompetent. Imagine, being able to fail with dignity

in your own eyes! Now I don't want to be in that category while flying, just

in all other matters. I mean that would complete for me the whole circle of

life: I wear glasses, my speech gets slurred on just six or eight beers, my

hearing is attuned to hear only Harley Davidson motorcycles with drag pipes,

I walk with a limp, have high blood pressure, have record setting high

cholesterol, thyroids are out of whack and I could afford to loose thirty of

forty pounds. 



The real Ralph from Ohio!

Kolb 1990 Firestar KXP





Hi Bob:  You did not clarify if that excursion to the brush was controlled,

intentional, or uncontrolled and unintentional.



john h



--------

John Hauck

MKIII/912ULS

hauck's holler, alabama





DO NOT ARCHIVE!!!

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David.Lehman

Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA

Posted: Fri Feb 03, 2006 8:00 pm Post subject: Pitot Geometry

OK Ralphie...



I nominate you for President of our ol' man's club...  I think most of us

are a lot like you...



DVD

On 2/3/06, flht99reh <flht99reh(at)netzero.net> wrote:

 	  Quote: 	
		  

 

 John, the question you asked below reminded me of an instructor in a

 Salesman course on successful salesmanship (I believe for those that care

 that it was the Larry Wilson Salesmanship Course). He said there are four

 categories of salesmen (or for that matter, any area of interest): The

 highest is the conscious competent. This one is aware that there

 successful

 and why. Then there is the unconscious competent. This one, he says, has

 no

 idea why they are successful. Then the third: the conscious incompetent.

 This individual is aware of why they are not successful. Then the last:

 the

 unconscious incompetent. He or she, has no idea why or the fact that they

 are unsuccessful.



 I was, for a great deal of my career, an unconscious competent. I had the

 way to sell refrigerators to Eskimo's; I just never understood why they

 bought from me. Now over my life I have graduated to being the conscious

 incompetent. I know that I know that I am a complete, in every way

 failure.

 But soon, I hope to acquire that happy medium most elderly men achieve:

 the

 full blown unconscious incompetent. Imagine, being able to fail with

 dignity

 in your own eyes! Now I don't want to be in that category while flying,

 just

 in all other matters. I mean that would complete for me the whole circle

 of

 life: I wear glasses, my speech gets slurred on just six or eight beers,

 my

 hearing is attuned to hear only Harley Davidson motorcycles with drag

 pipes,

 I walk with a limp, have high blood pressure, have record setting high

 cholesterol, thyroids are out of whack and I could afford to loose thirty

 of

 forty pounds.



 The real Ralph from Ohio!

 Kolb 1990 Firestar KXP





 Hi Bob:  You did not clarify if that excursion to the brush was

 controlled,

 intentional, or uncontrolled and unintentional.



 john h



 --------

 John Hauck

 MKIII/912ULS

 hauck's holler, alabama





 DO NOT ARCHIVE!!!

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_________________
ô¿ô

"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."

--- George Bernard Shaw

pj.ladd(at)btinternet.com
Guest

Posted: Sat Feb 04, 2006 3:40 am Post subject: Pitot Geometry

Move it about 15" forward and a bit down. If your pitot tube and static

 	  Quote: 	
		   air openings are about even with the front of the nose bowl, and at

 least 6" below it, it will work perfectly.>>


	


Gosh!, and all this time I thought it was just a matter of putting the pitot 

where the cows didn`t knock it off.



Cheers



Pat 



--

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flht99reh(at)netzero.net
Guest

Posted: Sat Feb 04, 2006 12:49 pm Post subject: Pitot Geometry

Davey, I would be most honored, and as such would delegate you as V.

President. As such, your first duty would to be to inform me as to what I am

to preside over!



Please, Please do not archive, as I probably would forget where to find it.



And yes, I know this demeans the value of the web site by carrying on site

such drabble. But then 'I am the President!



--

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