Everyone's Favorite Word "Pitot" (Speedometer Question)

[jhebert]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

I don't understand the TITLE of this discussion. Why is "pitot" supposed to be a favorite word?

 

[Silvertip]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

The correct pronunciation is "pit-oh" or "pi-toe". Or if you ever heard of the Ford Pinto, leave the "n" out of Pinto.

 

[jhebert]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

Actually the correct pronunciation is PEE-Toh, but that was not my question.

http://www.merriam-webster.com/dictionary/pitot

I don't understand the TOPIC mentioning "Pitot" as a favorite word. Is this an allusion to some prior discussion?

 

[Rotorfixer]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

Hello all,

I saw some posts near the beginning comparing this system to an aircraft system. An aircraft has both a static (ambient) and Pitot (total pressure) port, but the two are only used together in one system, the airspeed indicator. This is only to compensate for large changes in altitude. As the altitude increases the density decreases, the pitot input must be compensated for that, and it uses the static to do that. the pressure in the Pitot tube at 200 Kts at sea level would be greater than 200 Kts at 10,000 ft.

Water is technically non compressible, so it is the kinetic energy of the water that you are using to compress the air in the tube leading to or in the instrument. The system on a boat does not compensate for ambient water pressure so it does not have a static port.

Peter

 

[bds85466]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

PS: bds, I find myself trying to enlarge your avatar to get better look at that engine!

I actually had that motor (72 Johnson 125hp on a 72 Glastron -- right out of Live and Let Die) and it actually came with the girl! I bought the boat used from some guy though and she was used more than the motor. She's still in my basement...however, like the motor which is now 37, she's like 60 (did you notice her hair was already grey?...wierd, musta been the beach bum style). Old enough to be my mother. Rusty but trusty.

I've attached a more full version for you (what's opposite of a pedafile?...necrofiliacs?) who care.

 

[bds85466]

Re: Everyone's Favorite Word "Pitot" (Speedometer Question)

And for the record, my Pitot works. Thanks everyone.