All Spare Parts Self Launching Glider

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

glider1.jpg (199068 bytes)

glider2.jpg (193010 bytes)

The 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

glider3.jpg (97631 bytes)

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
This  needs  the full  mixing, elevator  to  trailing edge, ailerons to flaps,  flaps to ailerons,  ailerons to rudder, thermalling flaps on the side slider, launch flaps on a switch and crow braking on the start switch. This is very easy on a Futaba FF9 as it is preprogramed and  just needs the amounts dialing in.  Some people have put the crow on the throttle stick and used a side trim lever for the throttle.
The Crow braking is set up with 60 degrees of down flap, 15 degrees of up aileron with a little down elevator.

No surprises, the climb was rather slow with a power of  only  60 watts  per  pound, as  it wont  be used  in competitions this will not matter.  It  is a bit heavy but when  thermalling  you need  to get  the weight of the model out of your head and remember  that it will go up if it is in lift.
It flies about the same as most F3J models, transition  between thermals is good and it will go up wind in a stiff breeze,  helped by a little extra weight.
Landing is easy with the crow braking  switched in, if I  remember that the crow is not on the throttle stick.

glider4.jpg (54559 bytes)

glider6.jpg (150420 bytes)

glider5.jpg (168327 bytes)

Launch and fly by on Minchinhampton common


Gloucester Model Flying Club