Doesn't look to me that he included any flight time at all. He just quoted the total endurance time at mil pwr as listed in the hanger. So for the Hurricane I the 20 minutes he mentions has to include the transit time as well, which means it has very little fighting time over the attacked field, especially if the Hurri pilot wants some altitude at the fight. Example: Hurri I, 50% fuel, mil pwr, climb to 10K; at 25 miles (1 sector) E6B says there is only 11 minutes of fuel and 52 mile range. So if I want to be able to return to base thats only about 6 minutes of fighting time. (Although in truth, when defending against the horde, I rarely get to return... or last 6 minutes for that matter.)
Interesting you mention that. I had already tested out some endurance issues, just for kicks. I tested what I did because they represent the best of the best in climb and speed vs the not so good, yet the Hurri and P40 have %45 and %63 more fuel than the La7. The end results are only 5+ min difference, which can add up to double to time over target.
Map and bases: "NDISLES"; A1 to A4 (approximately 25 miles apart). Tested off line. Burn Rate is 2.0, just like MA's.
Constants: Upped from A1 on E runway and continued due E heading until arrival at A4. Took planes to 10k alt, then level flight until A4. All planes upped with 50% fuel, no DT, standard guns and ammo. All planes made three passes on drones. First was from south, second from north, third from SE, then went level fight and RTB'd to A1. Full throttle entire flight (no WEP) except in attack dive and landing phase.
La7: 50% = 11min. It took roughly 2min 50 sec to get to 10k, arrived at A4 made the three separate attack passes on drones (from S, from N, from SE), then RTB'd to A1 at 3200 ft. Landed with less than 1 min fuel left.
Hurricane IIC: = 50% = 16min. It took roughly 3min 45sec to reach 10k, arrived at A4 and made three separate attack passes on different drones (from S, from N, from SE), then RTB'd to A1 @ 3800ft. Landed with 5 min fuel left.
P40E = 50% = 18min. It took roughly 4min 27sec to get to 10k, arrived at A4 and made three separate attack passes on different drones (from S, from N, from SE), then RTB'd to A1 @ 3500ft. Landed with 6 min fuel left.
Both the Hurricane IIC and P40E could have made another 3-4 attack runs at drones before *needing* to head for home.
Disclaimer- Obviously some of the variables in the testing are things I cant control such as the position of the drones upon arrival. This effects the set up and egress, but regardless I believe the differences upon landing back at A1 would be less than 1 min under these circumstances. Also, throttle control and nose pitch are those "manageable" things that players can control that I did not take in to consideration. The La7's range is greatly effected if the juice isn't slurped up on full throttle and a gentle 100-250 fps dive is held while RTB. There are a lot of other things involved. I tested the extreme just for reference. Oh, and in no way I'm I saying that offline drones = MA targets, it was just used as a control.
My conclusion: the La7, with %50 fuel, can travel 25 miles, while climbing to 10k, spend 2-4 min over target based on throttle management, then RTB successfully. Oh, and in no way shape or form does %50 restrict the La7 or any plane for defensive purposes.