What's new in the Library
Member Reviews - Contribute a Review!
Bargain Hunters Forum
Classified, Want, Swap Ads
Community Links Library
FS9, FSX & P3D CTD Guide (Ver. 2)
FSX / P3D Configuration Guide
Simulation's Premier Resource!
AVSIM is a free service to the flight and simulation communities. Please help us keep it that way. Donate what you can today! Thank you for your support!
- FlightSystems Spring Promo, Free Payware!
- Aerosoft Discounts at SimPlanet
- Iris Simulations discount on FSS
- 3 Imaginesim airports now freeware
- Taxi2Gate MMMX Mexico City for FSX 30% off at Simmarket
- Chillblast and Matt Davies announce new line of FSX PCs
- FSiPanel July 4th $15 OFF
- Wing Creation Airports 25% off at simMarket
- REX 50% off Sale
- LLH Simulations -25%
- Galaxy GTX 780 for sale
- "Shaker" pair for sale (Transducer and Amplifier)
- Selling My 737 Gear :(
- Selling my Simulator to Realize my Dream.... Saitek FIPs, Yoke, Rudder Pedals, Radios, MultiPanel (AP), Switch Panel, Throttle Quad, etc.
- TrackIR 5 with Black TrackClip
- Saitek Pro Flight Yoke System With Rudder Pedals
- Boeing Style handles / Levers set for Saitek throttle quadrant
- Track IR 5
- Dell/Alienware M14 (Late 2013 model)
- VRInsight V737 Overhead
. . .
PMDG MD -11 FLEX data finished.
Posted 03 April 2009 - 05:00 AM
Michael A. R. Clavier
Posted 03 April 2009 - 12:22 PM
Posted 03 April 2009 - 01:03 PM
Pa = Alt + 145442.2*(1-(P/29.92126)^0.190261) Pa= Pressure Altitude, a=Altitude, P=pressureDa = ((Pa + 288.5-0.0019812*Pa)/0.0019812)*(1-((288.15-0.0019812*Pa)/(T + 273.15))^0.234969) Da=Density Altitude, Pa=Pressure Altitude, T=Temperature
Thank you both! I feel like I
The altitude you read on the guage when it's set to the current altimeter setting is INDICATED altitude. PRESSURE altitude is what the instrument reads when it is set to standard pressure (29.92/1013.2). To make the conversion if the pressure is not standard, you have to do a little math. Remember that 1" of pressure is 1000 feet. If the indicated altitude is 300 and the baro is 30.02, simply subtract 29.92, getting .1. So, .1" is equal to 100 feet. Subtract that from your indicated altitude to get a pressure altitude of 200 ft.Converting PRESSURE altitude to DENSITY altitude requires a bit more math, and honestly, I've only ever done it with a flight computer (E6B or CR3). Basically, you're correcting pressure altitude for non-standard temperature, so if the temp is higher than standard, your density altitude goes up and performance goes down. If the temp is less than ISA, density altitude decreases and performance increases.Important to remember is that density and density altitude are different. In other words, higher density is a lower density altitude. It's all in the terms...Most performance charts I've seen are in Pressure altitude, not density...thats the only reason why I asked the question, as it makes a significant difference...
Posted 03 April 2009 - 08:53 PM
Posted 04 April 2009 - 03:17 AM