SDM Sky Hawk 3389 Electric glider.
Made in China, distributed by Southern Model Supplies, South Australia.
Sold ready to fly (RTF) in stores for about $180.
Wingspan 1.2 metres, 380 motor.

What I have to say here is of my own opinion and my own ideas. I do not accept any responsibility for modifications to models made by others.
I have limited experience both as a flyer, builder and designer of radio controlled model planes. Despite that I enjoy what I do with them.

The Sky Hawk is an impressive electric glider model out of the box. It has everything you need to fly it except for 8 AA batteries for the transmitter. It is similar to a lot of beginner 3 channel RC models on the market and although strong it is not as strong as an Awesome Electrafun for instance. I was attracted to it's looks and soon found out that it glided well. What I didn't like about it as time went on was the main wing. It is not strong enough for a poor landing (I have bought 2 extra wings) and the wing bends alarmingly in a turn.

Simple, I thought and strengthened up the wing by gluing a sheet of thin balsa to the top of the wing. Then, when I tried it, the plane wouldn't turn at all!

At this stage most of my practical flying had been with 2 channel EPP slope gliders with flat wings using the 2 channels for ailerons and elevator only. This is a concept that is becoming more and more popular and allows for some pretty impressive aerobatics.

Idea!    Build a flat wing with ailerons.      That worked and it worked well!

This is how I did it.
On a 1mm balsa sheet I built up a wing similar in area to the old one.  Trimmed leading edge and a framework of spars and ribs supported another 1mm balsa sheet all glued together with thin CA. Some trimmed trailing edge formed the almost full length ailerons and these were moved by  DU-BRO part 231 and one of the existing servos in a fairly conventional layout. Solid balsa wing tips were upswept. It was covered in PROFILM.

By the time you make these changes there is no room for the elevator servo or the old servo/receiver tray. For the elevator control I took a small servo from a wrecked Awesome Extrafun put it in a spare servo tray from an Awesome Electrafun and linked it up with GOLD-N-ROD. It was anchored inside the fuselage just aft of the wing mount. To stop the rudder flopping around I made a new fin from balsa without a rudder.

Flight day.

I made maybe 10 test glides to get the trim right before powered flight. It looked promising and glided as well as the old wing. It would also bank and turn but with only a hand launch the airspeed was not far above stall speed and turns were not convincing.

Powered Flight.
The next day I launched into light wind with the engine running and it  climbed so well that I had to trim down. The first turns were responsive and it flew well. I took the power off, leaving trim down and it  came down with too much speed and before I knew it, it cart-wheeled along the deck without any serious damage. Second flight was much better with the trim up after the power came off. Since then I have been working on aerobatics that can not be done with rudder and elevator alone.