Efficiency and Cross Country

We are in the very early days of understanding efficiency and cross country capabilities of the UltimateL39. Here is some data from one of the XC simulations.

Here is a time to climb comparison of the UltimateL39 and the L39MS with the DV2 motor producing in excess of 4700 lbs of thrust. I've added to keep in mind the outright performance when you are considering efficiency. Efficient things tend to be boring but that really does not apply here.

The climb to FL25 Different cruise speeds and fuel burn A closer look at economy cruise Supporting numerical data climb cruise totalized fuel per flight segment

For this test, fuel from start up to FL25 was 32.9 gallons taking eight and a half minutes, fuel to descend was 22 gallons and economy cruise was roughly 85 gal/hr - 210 IAS and 317 TAS. The L39 carries just under 300 gallons of fuel and 1/2 hour reserves would be about 45 gallons. Returning to outright performance for a minute, the pilot left the throttle at maximum continuous cruise power when he reached FL25 and the plane accelerated to 306 IAS, 451 TAS, 881 DegC ITT at 172 gallons per hour.

Its been a while since I've updated this page. I just went to FlightAware and pulled data from the return trip from Pylon School. Reno to West Palm Beach with two fuel stops. It took five stops to get the plane back from Reno when I bought it. I've included some screen shots below.

I've updated the FlightAware plots to include coming back from the Reno area 10/19. One of the legs was over 900 miles and 2 1/4 hours!