109 e4 performance

Originally Posted by Robo.

Can you please convert 990 mmHg to ata for us please

I know a bit French and atmospheric pressure is pression atmosphèrique (et non pression d'admission comme on peut lire en bas d'echelle) - even for engineers. Perhaps with some poetic freedom they would have written pression ambiante. It is however written pression d'admission and this is a technical term. I checked and the most suitable translation are inlet pressure or manifold pressure.

See translation here:
http://dictionary.reverso.net/french...'admission.

I have no clue what exactly they address here as pression d'admission and of course this is open to debate. I am however quite sure that they don't mean atmospheric pressure. Perhaps a Frenchman could tell if one is around?

EDIT: My calculator sais that 980 mmHg = 1.289 atm (=ata?)
and 990mmHg are 1.303 atm

So basically the French achieved 494 kph at 600 m with rpm 2400 and 1.303 atm pression d'admission
Extrapolating pessimistically to 0m they got 478 kph with rpm 2400 and 1.289 atm pression d'admission

[CaptainDoggles]

Originally Posted by 41Sqn_Stormcrow

Perhaps a Frenchman could tell if one is around?

Je ne suis pas "Francais" mais bien sur je suis Canadien. "Pression d'admission" veut dire "Manifold Pressure". Il ne fait aucun doute.

Pour "atmospheric pressure" je dirais "pression atmospherique".

EDIT: My calculator sais that 980 mmHg = 1.289 atm (=ata?)
and 990mmHg are 1.303 atm

Yep. 990 mmHg (torr) is equal to ~1.32 bar or ~1.303 atmospheres (ATA on the German gauges).

[Crumpp]

990 mmHg mainfold preassure is 1.34 Ata

Yep, I read the doc and converted 980mm. Later I confused it with the 990mm he was asking about.

Facts vs facts would be much easier,

Of course. Who cares about opinions? I have one, you have one, and everyone knows what they are like....

Facts are the engineer firm of Mtt entered into a contract to deliver the stated performance. The customer (RLM) held that firm accountable and tested each airframe delivered to ensure it met the contractual agreements in place.

Works the exact same way in today's aviation marketplace!!

[JtD]

Originally Posted by CaptainDoggles

pression d'admission

"Intake pressure".

1 ata is a technical atmospheres (at = technical atmosphere, a = absolut) and 1 at equals 735mm HG. Which makes 990mm 1.35 ata.

1 atm is a physical atmosphere and 1 atm equals 760 mm HG.

Some experts can't tell the two apart and come up with 1.28 ata for 980mm, which is wrong.