Electric Towplane sets a new climb record

On Sunday, January 14, 2018 at 8:32:19 AM UTC+13, Tony wrote:
My experience in the Electro in Uvalde and Kansas is that motor temp
becomes an issue well before battery and controller temp.

Depends on the machine. Antares has better motor cooling,
but batteries start to get hot and require early shutdown
at Uvalde for example (I typically shut down 800-1000 ft).
Perhaps cooling for enclosed FES motor isn't as good?

See ya, Dave

On Sunday, January 14, 2018 at 5:33:15 AM UTC-5, Dave Nadler wrote:
On Sunday, January 14, 2018 at 8:32:19 AM UTC+13, Tony wrote:
My experience in the Electro in Uvalde and Kansas is that motor temp
becomes an issue well before battery and controller temp.

Depends on the machine. Antares has better motor cooling,
but batteries start to get hot and require early shutdown
at Uvalde for example (I typically shut down 800-1000 ft).
Perhaps cooling for enclosed FES motor isn't as good?

See ya, Dave

Pylon mounted motor will obviously cool much more easily than enclosed motor cooled through a small hole. Each concept has it's trade offs.
UH

Pylon mounted motor will obviously cool much more easily than enclosed motor cooled through a small hole. Each concept has it's trade offs.
UH

Pylon mounting is the way to go. The FES self-launchers are VERY tricky to launch on a grass field because the prop tip is just a few inches off the ground. I have watched a friend blow up his prop on a grass field with just small bumps in it.
I like the new Polish GP series. The electric motor extends and retracts in just 4 seconds! Too bad there is a 2 year wait. The batteries are adequete now and will get better. There is a huge worldwide effort now to improve them.