I use the BAR method. Fuel Burn to destination, to Alternate, plus Reserve gives required fuel. Subtract this from FOB (Fuel on Board) gives how extra much fuel to hold with. Divide this number by fuel PPH and it gives your time in the hold.
B - 3000 lbs
A - 2000
R - 1200
________
6200 required. If you have, say, 7500 lbs on board, you have 1300 lbs of holding fuel. Burn 2000 lbs/hour (both engines), it leaves you with .65 hours of holding, or 39 minutes.
Last edited by jsfboat; 13th Jul 2015 at 05:03.