Aces High Bulletin Board
General Forums => Aircraft and Vehicles => Topic started by: earl1937 on July 01, 2013, 12:08:07 PM
-
:airplane: Internal combustion engine designers had to have a atmosphere from which to start there engine design! What is the standard temperature, barometric pressure and height above sea level from which to start their calculations? Assume a 7 cylinder radial engine, with normal carburation system.
-
:airplane: Internal combustion engine designers had to have a atmosphere from which to start there engine design! What is the standard temperature, barometric pressure and height above sea level from which to start their calculations? Assume a 7 cylinder radial engine, with normal carburation system.
:airplane: The "Standard" atmosphere, from which all designs, both engine and aircraft, is: #1- Sea Level, 59 degrees Fahrenheit, 29.92 inches of barometric pressure! Any deviation of any of the three will effect both engine performance and aircraft performance. Example, at Denver's International airport, the elevation above sea level is 5,430 feet above sea level. You could still have a barometric pressure setting of 29.92 and the OAT of 59 degrees, but when compared to Miami, Fla airport, your aircraft and engine would only recognize the density altitude of the airport you are sitting on, at Denver. If you compared the takeoff at Denver to the takeoff in Miami, you would see real quick that because of the less dense air at Denver, your takeoff roll would be quite a bit longer. Now, if you were to also include the OAT of Miami, 92 degrees for example, and you had the same at Denver, you would really have a loooong takeoff roll in a piston type engine.
-
Are you the guy who used to go by the handle "Torquilla"?
MH
-
Are you the guy who used to go by the handle "Torquilla"?
MH
No Earl is the real deal,has seat time in more airplanes than I can think of! IIRC Earl flew a B29 on a couple of occasions,but I should let the man tell you himself.
:salute
-
Are you the guy who used to go by the handle "Torquilla"?
MH
:airplane: No, not me sir! Just an old "coot", reliving a life time of flying in this little old game! The only thing I have left to add to anything constructively is my experience and in hopes that it might help someone who loves to fly and wants to learn.
-
I believe it is 15 degrees celsious ( 59*F) and 29.92 barometric
-
59/15, 29.92
Typical radial engine float carb (or could be a pressure carb):
(http://avstop.com/ac/fig2_7.jpg)
Float carbs for dummies:
(http://www.free-online-private-pilot-ground-school.com/images/carburetor.gif)
-
I believe it is 15 degrees celsious ( 59*F) and 29.92 barometric
:airplane: That is correct, plus sea level
-
:airplane: That is correct, plus sea level
:headscratch: sea level is a constant.
-
During WWII the standard atmosphere varied from nation to nation. In some cases a country operated with more than one standard.
-
:headscratch: sea level is a constant.
:airplane: Correct, but one of the three "standards" when computing performance data.
-
During WWII the standard atmosphere varied from nation to nation. In some cases a country operated with more than one standard.
You, Sir are correct! Russia was a prime example!