This build is about 95% this 60″ glider from RC Groups although, instead of Readi-Board, it’s made from a sheet of 1/4″ DOW fanfold foam which is slightly thicker, heavier and stiffer.
A test fit of the fuselage top sections. I’m actually gonna wait a bit before gluing these in place.
I drilled a hole through the front of the monoblock to pass the motor wires through.
Gluing the firewall on the front.
A length of 0.21″ carbon fiber tube will form the main spar. I tucked it in behind the step in the KFM5a wing.
Gluing the step in the wing tips.
And the wingtips onto the wings.
Gluing the vertical stabilizer in place atop the horizontal stabilizer.
Pieces to form the wing saddle.
Figuring out where to cut the inner wing saddle.
Using a utility knife to make sure the wing saddle is – roughly – straight.
Adding the outside section of the wing saddle.
Testing the fit of the wing in the saddle.
Getting a feel for the size and shape of the finished plane.
Test flights showed that the incidence between the wing and the tail was off, causing the plane to want to dive, rather than float. I eventually placed a foam shim about 0.30″ thick under the leading edge of the wing, increasing the wing’s angle by about 3.5° with respect to the tail plane. The plane’s glide characteristics were drastically improved, but this is clearly a temporary measure.
To create a more permanent fix, I decided to restore the wing to its original position and instead lift up the trailing edge of the horizontal stabilizer to create the same angle. After doing some trig, I computed the thickness and angle of the required shim and created a template in Photoshop.
I printed this template out and cut four slices of FFF.
Here’s a test fit of the shim inserted under the tail. I also used the inclinometer on my cell phone to take measurements of the difference between wing and tail angles before I started so that I could make sure I’d recreated them with the old shims removed from under the wing and the new shim inserted under the tail.