Canopus - Forward Swept Wing Scratch Build

January 31, 2016|Cyberdos

Design Challenge

Have been continually building foamies with intent to improve build techniques as well as answer the question from some colleauges if these designs will fly well. One of my desires is building forward swept wing airplane.

To me they are not only exotic, they are beautiful works of art and science.

Setup

Here are my recommendations to make this flying beast with speed as it cries in the skies, powerful vertical included.

aircraft dimensions: 30x40x7 (LxWxH inches)

aircraft type: simple elevon flying wing, rudder (no controls, serves as stabilizer only)

power setup: DYS G-power series 2300Kv motor, 3S 2200 mah 25C battery, 30 amp ESC

propeller: 6x5E

servos: 2 x HXT900 9g servos

receiver: GA7003XS FASST RX with 3 axis stabilizer - compatible with Futaba SG14 Tx

materials: EPP foam (fuselage), standard 6mm sheet (wings/rudder). 3mm carbon spars/stiffener, foam safe glue.

color: Acrylic epoxy spray paint.

Techniques for The Foam Works

WINGS

Made using two layers of standard 6mm foam sheet, reinforced with carbon fiber spars in between. No need to remove the papers on the surface for tougher wings. Here is the wing pattern designed in visio to pdf > CanopusWingDesign and TiledA4_CanopusWingDesign

Smooth beveling method - with a pattern about 1 inch from the leading edge of the upper layer, use cutter to make the outline of 1mm deep. Pass through the pattern using a ball point to make the cut deep and wide enough for the hot wire to run through. This method will provide a smooth slope.

FUSELAGE

Used layers of EPP foam then reinforced it with a carbon fiber tube.

Using masking tape as patterns for cutting - i found it easier to use paper masking tape to simply stick directly on the epp and outline the shape of the epp portions to cut whether symmetrical or not. The material does not burn easily with foam cutting wire while the epp melts. So it reduced the burden of creating intricate actual patterns from boards and etc.

Battery Space Using a Conventional Soldering Gun

Creating a battery space beautifuly can be made easy by using large clipit and a soldering gun.

Paint Job

Since fudelage is EPP, it does not melt using acrylic epoxy spray paint, it can be applied directly without worries using the proper method. Honda Blue color is preferred for extra sheen.

The wings are not compatible with the same paint. The paper cover on the surface helped as protection. As you can see on the tip of the left wing, there has been a bit of melt when acrylic paint is sprayed directly. It can be done but be careful to apply the paint moderately. CTM Yamaha Orange is used for this for brass appearance.

The Maiden Flight

Although the Orange flight stabilizer GA7003XS is optional for the setup, it helped a lot in the maiden flight, it could have been so different without this for a test anyway.

Forward swept wing design usually have CG far way forward of the actual wing surface, this one, the battery is installed just the trailing edge of the canard (which is static). Its advantage is having more space in the fuselage, the canard helps compensate for lift should the fore part is heavy. Happy to see that the Canopus is set up right on the first flight.

These pictures reveal the beauty of a forward swept wing aircraft like the Canopus, thanks to my friend photographer, rc enthusiast and pilot Ferrari Miranda.