bikert
Ejection Handle Pulled
- Joined
- Dec 7, 2015
- Messages
- 346
- Display Name
Display name:
bikert
We often see that claim that GA can beat the airlines. Heck, I say that to myself all the time.
So I just made a little spreadsheet to play around with it. These are my assumptions:
al_tas = Airlines true air speed
ga_tas = GA true air speed
al_initial_delay (mins) = Total time spent getting to airport, checking in, waiting, before wheels up
al_final_delay (mins) = Total time spent from wheels down to getting to ground transportation.
ga_initial_delay = Total time getting to your GA plane, starting up, taxiing, before wheels up
ga_final_delay = Total time from wheels down to getting to ground transportation
distance = breakeven distance. Anything more than this it is better to take the airlines. Less than this, better to fly yourself.
Time equation:
distance/al_tas+al_initial_delay/60+al_final_delay/60 = distance/ga_tas+ga_initial_delay/60+ga_final_delay/60
Therefore:
distance =(ga_initial_delay/60+ga_final_delay/60-al_initial_delay/60-al_final_delay/60)/(1/al_tas-1/ga_tas)
Assuming I'm flying from two places serviced by the airlines, here are some realistic numbers for me:
al_tas 460
ga_tas 200
al_initial_delay 90 minutes
al_final_delay 30 minutes
ga_initial_delay 15 minutes
ga_final_delay 10 minutes
For these parameters my break even distance is 560 nm. Sounds about right. Or maybe I should stop over analyzing and trying to find an excuse to fly and just fly!
So I just made a little spreadsheet to play around with it. These are my assumptions:
al_tas = Airlines true air speed
ga_tas = GA true air speed
al_initial_delay (mins) = Total time spent getting to airport, checking in, waiting, before wheels up
al_final_delay (mins) = Total time spent from wheels down to getting to ground transportation.
ga_initial_delay = Total time getting to your GA plane, starting up, taxiing, before wheels up
ga_final_delay = Total time from wheels down to getting to ground transportation
distance = breakeven distance. Anything more than this it is better to take the airlines. Less than this, better to fly yourself.
Time equation:
distance/al_tas+al_initial_delay/60+al_final_delay/60 = distance/ga_tas+ga_initial_delay/60+ga_final_delay/60
Therefore:
distance =(ga_initial_delay/60+ga_final_delay/60-al_initial_delay/60-al_final_delay/60)/(1/al_tas-1/ga_tas)
Assuming I'm flying from two places serviced by the airlines, here are some realistic numbers for me:
al_tas 460
ga_tas 200
al_initial_delay 90 minutes
al_final_delay 30 minutes
ga_initial_delay 15 minutes
ga_final_delay 10 minutes
For these parameters my break even distance is 560 nm. Sounds about right. Or maybe I should stop over analyzing and trying to find an excuse to fly and just fly!