Dr. Feller your videos are excellent. I am a 71 yr old student pilot fulfilling a life time dream. Learning the mechanics of flying the airplane is not as intimidating as taking the FAA test. Your videos illustrating steps to properly work the the various problems of pressure /density altitudes are invaluable.In addition I have implanted your other formulas as well. These work more accurately than using the "wheel". At my age you recognize in preparing for this test your ability to focus and process through info is not what it used to be. Once again thank you......Peter
Although this video is 7 years old, this knowledge is still being passed on to the younger generation like me. Your videos made me understand how to solve these problems and so thank you sir. Helping out the future generation of Pilots. I tip my hat to you sir.
Dr. Feller, thank you for being so thorough with your explanation! Sometimes I need things explained in great detail just for it to sink in. I’ve had a lot of trouble with D/A because it was not thoroughly explained. I cannot say thank you enough for your videos. I’ve subscribed and will be watching and sharing with the students in our class that are having trouble as well. Thank you and god bless!
Kudos for making your own formula and charts. I like to do this myself. Although in my case I find your method to be exceedingly convoluted and easy to get confused.. After following your logic most carefully I have derived a system that works much better for me. I would put the target answer in B in between the two known values to more easily visualize that I am looking for something in the middle. And I do simple math (97/10) X 2. Or better yet (97/10) x 8 so I can ADD to the smaller number rather than subtract from the larger because addition is an easier operation with fewer chances of errors. Once you know the concept it can probably be done easily in your head. But good advice to use a calculator and write it all down anyway just to double check.
Thank you for this video Alan. I was following you and all made sense (i would have just used simple interpolation to get the number), until you went to 60 degrees to read off the density altitude. Why did you read strait up instead of just following the given standard temperature line?
If the temperature is at standard shouldn’t the density altitude be the same as pressure altitude since density altitude is pressure altitude correct for non standard temperature.
I have a much better understanding of interpolation. I am struggling with a question on Pressure Altitude involving 0 and -73. as the B and C conversion factors on a question. If you can help me work through this in any way I would greatly appreciate it. thanks.
Could yo make this question please. "Determine the pressure altitude at an airport that is 1386 feet MSL with an altimeter setting of 29.97". I don't get the answer with the method you gave us and it's confusing me. Thanks
I have a problem I got the FAA ARIMEN KNOWLEDGE TEST GUIDE Book But My Book 2004. All the questiona are on diffrent page numbers To what yours are and the maps are on diffrent page numbers But it still the same Answers and Quesstion. But i can work it out. and id like to say thank you very much Alan for this Video on Density Altitude. It tuck me a while to figger it out but iv got it in the end. This is a great video thank you
With all these calculations (especially if you're not a numbers person), how could anyone possibly answer all the test questions in the time allotted?????
Good detailed explanation up to density altitude part. On standard day temperature, density altitude is equal to pressure altitude. 59 degrees is sea level standard temperature. As you climb the temperature drops. On the chart you basically follow boldest pressure altitude line for standard day. Your density altitude answer would be correct if question had asked to find DA at 59 F at your current altitude. Otherwise good job. Thanks for the effort.
THE FORMULA DOES NOT WORK ESPECIALLY WHEN DEALING WITH NEGATIVE NUMBERS. AN EXAMPLE WOULD BE THIS ONE : DETERMINE THE DENSTITY ALTITUDE FOR THESE CONDITIONS ALTIMETER SETTING 30.35, RUNWAY TEMPERATURE +25F AND ARIPORT ELEVATION IS 3894MSL. PLEASE ADDRESS THIS I AM KINDLY REQUESTING. THANK YOU FOR YOUR TIME.
