|There seems to be a lot of
electric gliders about that don't thermal well, I suspect this is
because a lot of flyers use them like power planes. I have an electric
Highlight that thermals well but being light it does not like the wind,
this is the reason for building a larger electric glider.
One model I do like is the John Emms fillip 600, good balance of power and thermalling ability and nice to fly.
My model was built from odd bits, I was given the Charisma centre wing section by Dave East, it needed a repair, Meredith gave me the wing tips and V tail from his Starlight, the fuselage from came from Ebay and cost me £25, the motor came from the Blackbushe air show bring 'n' buy.
|wingspan 3.1 metres
length 1.4 metres
servos 6 x HS82MGs
prop 10 X 6 folding
battery 2500ma Lipo
speed controller 40A £5 Ebay cheapy
RX GWS 8 channel
construction hollow molded wings and epoxy glass fuselage from Kevin Beale
Axi 2829/10 1200KV just fits in, the wires
nearly touching the revolving case. The motor draws 22 amps
from a 3 cell 2500 lipo which would give the model about 10 climbs to
thermalling height, no ventilation is need with these short motor runs,
I did 3 consecutive climbs and used the brakes to descend and the motor
stayed cool and battery only slightly warm.
An increase in prop size and some tough lipos would increase the power to 450watts
The only hard bit in putting this model together was fitting the V tail, to make the V in the fuz I fitted a broom handle inside with a V cut out, then put the male part of a V on the outside warmed it with hairdryer and screwed the two together forming a V in the round fuz. Balsa push rods work the tail, servo tray is under the wing.
6 servos are too much for most BECs so I used some AA nimh to power the servos and RX
Setting up the wing and tail incidence was done by eye and the C of G by guess work, it flies with no trim so I can not be far out.
Radio set up
Launch and fly by on Minchinhampton common