Pressure Altitude = 29.92 - (Physical Altitude / 1000) Station Pressure = 30.14 - (4500 / 1000) = 30.14 - 4.5 = 25.64īut what if we have nothing to tell us the atmospheric pressure at all? Then do this: The sea-level barometric pressure is also what is reported by radio and TV stations.Įxample: Your local TV station is reporting that the barometric pressure is 30.14 inches. You may obtain the sea-level barometric pressure from the weather service. Station Pressure = Sea-level Barometric Pressure - (Physical Altitude / 1000) If we have no instrument to measure the local station pressure, but we know the sea-level barometric pressure, we can do this:Īn approximation for the station pressure is: If you have obtained the Pressure Altitude from the table above, you may skip to Step 2 below. If you would like to download a copy of the Excel spreadsheet upon which the table above is based, so you can print your own copy, right-click on the following link: Pressure Altitude Spreadsheet. Finding 19.5 in the table, I see the Pressure Altitude is 11,374 feet. If you aren't familiar with the distinction between station pressure and barometric pressure, you may wish to read this reference: Barometric Pressure and Ballistic SoftwareĮxample: The sensor in my Casio Pathfinder watch reads a pressure of 19.5 inches. Just pick the nearest increment to your station pressure. It's in increments of 0.25 inches of mercury. If you have the station pressure from an instrument you carry, the easiest way to find the Pressure Altitude is to consult the table below. The easiest method for doing this is to print copies of the table and the chart below, and use those. Then we must compensate the pressure altitude for the temperature, which is usually different than the ICAO standard temperature at the pressure altitude. The pressure altitude is the altitude an aircraft altimeter would read at our location if the reference pressure on the altimeter were set to the current sea-level barometric pressure. However, it will get you pretty close if you don't have a Kestrel or other weather meter to do the calculation for you.įirst we must calculate the pressure altitude, because barometric pressure varies, which affects the pressure altitude. Your Kestrel includes humidity in its calculation of density altitude. This article is an addition to and continuation of the method of using density altitude in computing ballistic performance, Making Ballistic Cards Using Density Altitude Our team would be more than happy to answer any questions you may have, show you a vehicle, and help set up a test drive.Manual Calculation of Density Altitude Manual Calculation of Density Altitude If you would like to learn more about this package, or you would like to see our comprehensive list of new inventory, stop by Marc Motors in Sanford, ME. You will not have to worry about your mirrors icing over on your drive, or your hands being frozen by your steering wheel. Not only with this provide extra comfort on those chilly mornings and nights, it also will provide an extra layer of safety. This offers features like a heated passenger cloth seat, heated outside mirrors, and a heated steering wheel. That is why Nissan vehicles are outfitted with what is called the 'cold weather package'. The drive should be as stress-free as possible, allowing you to stay warm, listen to your favorite music, and travel in comfort. With the cold weather now in our future for a few months, it is important to be able to stay warm when you are driving to work, school, or your home.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |