B-29 DOC

rwdfresno · **Posted:** Tue Apr 17, 2007 5:14 pm

Quote:

bluethunder28 wrote:
Too bad that they weren't able to keep on schedule. The last time I visited Doc was in 04 and was told that she would be ready to fly in 06. In 03 they said 05. In 02 they said 04.....

Too many changes with the people running the program.

When you are around warbirds a long time, you quickly learn that "next year" (or whatever time frame mentioned) means much longer than that.

JH

There is no such thing as a schedule when you are restoring something. It always takes way longer and is way more expensive than originally thought. Once you start tearing something down it uncovers something else, and when you tear that apart you find something else. Then you always say "Well I have gone this far I may as well replace this or that since I have the whole thing apart." I have been working on my Jeep restoration that quickly went from a 3 month long cosmetic restoration to a 3 year long ground up restoration that includes a ton a fabrication.

Ryan

gregv · **Posted:** Tue Apr 17, 2007 5:29 pm

I thought the rule of thumb for restoring anything (cars, motorbikes, airplanes, tanks, houses..) was 2.5 times the original estimate of both time and money...

She really needs to get under cover before her makeup runs...

greg v.

JDK · **Posted:** Tue Apr 17, 2007 7:32 pm

Airlift48 wrote:

This is also irritating:

Pitot

Pee-Toe

or

Pee Tot

Which is it?

The original word is 'Pitot'. It's actually the name of a French physicist, so that is therefore the 'correct' spelling, as it's a proper name.

Lynn Allen · **Posted:** Tue Apr 17, 2007 9:37 pm

This is the wrong time of year for it to be outside in that part of the world :shock:

Lynn

frreetom · **Posted:** Wed Apr 18, 2007 3:50 am

Lynn Allen wrote:

This is the wrong time of year for it to be outside in that part of the world :shock:

Lynn

Doc lived out in the California desert since 1956 by him self, being shot at and birds pooping all over the place, so what a little cold air and snow gonna hurt.........ALOT .........some one find DOC a warm place.
Its too bad,,,,,,, I towed Doc 38 miles accross the China lake Naval weapons range to Inyokern of the nice warm Desert so Doc could fly again.........Not to sit out in the cold in KANSAS...............

Tom,,,,,,,,,,,,,,

Airlift48 · **Joined:** Sat Oct 29, 2005 7:01 pm **Posts:** 744

JDK wrote:

Airlift48 wrote:

This is also irritating:

Pitot

Pee-Toe

or

Pee Tot

Which is it?

The original word is 'Pitot'. It's actually the name of a French physicist, so that is therefore the 'correct' spelling, as it's a proper name.

Yeah, spelling wasn't the issue. Pronunciation..that's what I was after..

"Pee-toe" is correct.

Nathan · **Posted:** Wed Jun 20, 2007 9:00 pm

Lynn Allen wrote:

This is the wrong time of year for it to be outside in that part of the world :shock:

Lynn

I'd worry more about tornados. I thought Kansas was tornado country? :shock:

Nathan · **Posted:** Wed Jun 20, 2007 9:01 pm

Lynn Allen wrote:

This is the wrong time of year for it to be outside in that part of the world :shock:

Lynn

I'd worry more about tornados. I thought Kansas was tornado country? :shock:

planeoldsteve · **Posted:** Thu Jun 21, 2007 5:12 am

Airlift48 wrote:

JDK wrote:

Airlift48 wrote:

This is also irritating:

Pitot

Pee-Toe

or

Pee Tot

Which is it?

The original word is 'Pitot'. It's actually the name of a French physicist, so that is therefore the 'correct' spelling, as it's a proper name.

Yeah, spelling wasn't the issue. Pronunciation..that's what I was after..

"Pee-toe" is correct.

I was always under the impression that P-tot was short for pressure total - static pressure = dynamic pressure or air speed?

Steve

JDK · **Posted:** Thu Jun 21, 2007 7:06 am

Airlift48 wrote:

Yeah, spelling wasn't the issue. Pronunciation..that's what I was after..

"Pee-toe" is correct.

Sorry, didn't realise what you were after. That's what I've heard too, around the English speaking world, but I dunno what Henri would've approved of.

planeoldsteve wrote:

I was always under the impression that P-tot was short for pressure total - static pressure = dynamic pressure or air speed?

I never knew the origin myself before looking it up, Steve, but having referred to it in a number of aviation dictionaries when proof reading, I knew it was a unique spelling, and never capitalised as an acronym.

Given the term's use in the early days of aviation, it pre-dates the general (over-)use of pointless acronyms in aviation (or PAIA for short. :roll:

)

http://en.wikipedia.org/wiki/Pitot_tube

http://en.wikipedia.org/wiki/Henri_Pitot

http://www.britannica.com/eb/article-90 ... enri-Pitot

On topic, any new news on Doc?

bdk · **Joined:** Sun May 02, 2004 1:16 am **Posts:** 11324

planeoldsteve wrote:

I was always under the impression that P-tot was short for pressure total - static pressure = dynamic pressure or air speed?

Quote:

Pitot-Static tubes, which are also called Prandtl tubes, are used on aircraft as speedometers.

The pressure transducer (airspeed indicator) measures the difference in total and static pressure which is the dynamic pressure q.

http://www.grc.nasa.gov/WWW/K-12/airplane/pitot.html

Quote:

The Pitot tube (named after Henri Pitot in 1732) measures a fluid velocity by converting the kinetic energy of the flow into potential energy. The conversion takes place at the stagnation point, located at the Pitot tube entrance (see the schematic below). A pressure higher than the free-stream (i.e. dynamic) pressure results from the kinematic to potential conversion. This "static" pressure is measured by comparing it to the flow's dynamic pressure with a differential manometer.

http://www.efunda.com/designstandards/sensors/pitot_tubes/pitot_tubes_theory.cfm

http://www.aviationgroundschool.com/sample_pages/airspeed.html

And:

An airspeed indicator is a differential pressure gauge with the pressure reading expressed in units of speed, rather than pressure. The airspeed is derived from the difference between the total, or stagnation pressure and the static pressure. The total pressure is usually detected by a pitot tube which is mounted facing forward; the static pressure is usually detected at static ports on one or both sides of the aircraft. Sometimes both pressure sources are combined in a single probe, a pitot-static tube.

Warbird Mechanic · **Posted:** Thu Jun 21, 2007 10:35 pm

Anytime when you work on old warbirds like I have, timelines for completion are most generally meaningless. Especially when you are dealing with a warbird in which there are no parts supply readily available and you are forced to reverse engineer parts instead. Its sad to see Doc out in the elements like that. Hate to see all that sheet metal work go down the toilet. Hope they do get the plane under cover soon.

As for the pitot tubes, they actually measure impact pressure. There are static ports on the side of the fuselage that measure ambient pressure. Its the difference between the impact pressure and ambient pressure that determines the aircraft's airspeed. I've heard a couple of southern gentlemen call them "pee dot" tubes.

Jim

frreetom · **Posted:** Fri Jun 22, 2007 8:47 am

I thought we were talking about DOC........................
HANGER HANGER HANGER pass it on

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