8000 ft density altitude takeoffs
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Jeffrey Banks
Jun 22, 2020, 7:54:26 PM6/22/20
to FES Owners
I’ve done several high density altitude takeoffs. I see between 16 and 18 Kw st full power. It should be closer to 22k
Kw
No problems keeping up with the 26E’s and Solo powered Ventus
Let me know what sea level takeoffs are producing for Kilo watts
Jeff Banks
Jamie Shore
Jun 22, 2020, 10:05:15 PM6/22/20
to Jeffrey Banks, FES Owners
This graphic shows my typical takeoff profile as well as typical full power at sea level on 80-90 F days.
Jamie Shore
mini Lak FES
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Jeffrey Banks
Jun 23, 2020, 11:01:02 AM6/23/20
to FES Owners
Jamie
Thanks for your very nice graphic
I’m guessing that my lower power for takeoff might be the propeller
At 8000 ft DA it might be attempting to over speed and the controller is limiting the RPM
It is only speculation on my part.
Jeff Banks
Bryan T
Jun 23, 2020, 4:13:55 PM6/23/20
to FES Owners
It seems to me that the controller adjusts power output to keep rpm at or near redline.
I have also done some high density altitude takeoffs, one probably at about 8000 feet, and the rpm I see is the same as my sea level takeoffs. Also, max rpm is seen at the beginning of the takeoff roll (High or low DA) but as you accelerate, rpm does not seem to increase during acceleration as the prop unloads. I do not always hawk the kw at this high workload time, but have noticed that it was lower at higher DA, and lower after accelerating to climb speed.
However, I asked Luka (Hi Luka!) about this at SSA Reno, and he said, if I understood correctly, that it does not do this...
Bryan
Silent Electro #2087
I have also done some high density altitude takeoffs, one probably at about 8000 feet, and the rpm I see is the same as my sea level takeoffs. Also, max rpm is seen at the beginning of the takeoff roll (High or low DA) but as you accelerate, rpm does not seem to increase during acceleration as the prop unloads. I do not always hawk the kw at this high workload time, but have noticed that it was lower at higher DA, and lower after accelerating to climb speed.
However, I asked Luka (Hi Luka!) about this at SSA Reno, and he said, if I understood correctly, that it does not do this...
Bryan
Silent Electro #2087
Bryan T
Aug 3, 2020, 10:53:15 PM8/3/20
to FES Owners
Hi guys,
Just did a takeoff at Truckee on Saturday, about 8000 DA.
I saw 16 KW at the beginning of the takeoff roll, RPM 4500-4600.
Did not pay much more attention to power setting until I reduced power at about 500 above field elevation.
FYI and FWIW
Bryan
Just did a takeoff at Truckee on Saturday, about 8000 DA.
I saw 16 KW at the beginning of the takeoff roll, RPM 4500-4600.
Did not pay much more attention to power setting until I reduced power at about 500 above field elevation.
FYI and FWIW
Bryan
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