Construction continued - Aerosquare

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Construction continued

Details

If you did it well, you should have the fuselage in your hands now. We still have to build the engine cowl, the landing gear, the wings, install the radio and make a nice decoration.
I wont detail the last two points, they depend on each one tastes and habits. 

Engine cowl

 

Coupe 3D sur le capot moteurCapot du BeaverThe engine cowl is made of two depron rings linked holded together with balsa spars. The structure is then covered using a sheet of depron rolled around it. The front of the cowl is made of 3 6mm rings sanded to the right shape. It quite easy to do and the result is very nice and light. It is also possible to heat form the cowl using a shape turned on a wood lathe.
And if you are really a lazy one, just take a soda bottle and cut it to the right size.

Landing gear

DHC2 - Train d'aterrrisage en aluminium/montage du train sur la cellule et support moteur The structure of the landing gear is made of a 15/10 mm aluminiul section bended to the right shape. With lightening holes as on the picture, it weighs 19 grams and is robust enough to support the worse landings.
But to miss a landing with this plane...


The landing gear is fixed to the plane using 2 nylon screws. Wheel fairings are made of depron foam glued to the landing gear. On the photo you can also see the engine mount installed. It can fit a 400 motor.

 

Wing construction

Construction de l'aile

Building the wing is quite classic
The 3mm depron ribs are slipped on a 6mm dia carbon rod.
You can replace the carbon by a balsa spar. It is more than enough for such a plane. Unless you plan to do 3D flying...
In addition the carbon rod is heavier (20 g) where balsa is only 6 g.
The wing tips are made from foam sanded to the right shape.
The structure is covered with 3mm depron sheet.

Don't forget the struts .They will strenghten the wing.
The struts are made from solid balsa with 2 bits of piano wire at the ends.
Look at the photos to see how they are attached to the wing and to the airframe.

Installation radio and motor

Beaver DHC2 Installation radioRadio equipment and motor

Receiver :
Simprop Indoor 2000
Servos: 3 GWS Naro Pro (rudder and tail wheel, elevator, ailerons)
ESC: Jeti 350. An 18 amps ESC is more than enough but I had only a 35 amps.
Motor: Speed 400 6 volts with MPJet 3.8:1planetary gearbox and APC-E 11x8.5 propeller.
Batteries: 8 cells KAN 950 NIMH . I now use 1800 MAH 3S1P Polyquest Lipo instead of the KAN batteries.

Avoid heavy radio gear like 50 g servo units that would limit the performance and the behavior in flight.
This plane flies wonderfully using an inexpensive geared Speed 400 6 volts. A small brushless will improve performance but it is significantly more expensive. Then if you want to fly longer, why not installing a Lithium Polymer battery pack?


compartiment accusBatteries are accessible through a hatch on the bottom of the fuse.

trappe à accusWhen I designed this plane I used 900MAH Nimh batteries with a 3.8:1 geared Speed 400. Consuption of the Speed 400 is 10-11 amps turning the prop at  5600 rpm. This was years ago. And this configurations is now obsolete.

You can look at the orhers Beaver built from these plans and what motor/batteries they use to get an idea of what you could do. Any cheap Chinese brushless outrunner with a low KV will give better result than the Speed 400 config.

 

Decoration

I've painted my model with water based painted directly on the depron. If you need some inspiration to paint your Beaver, just have a look at this site: DHC2.com
You will find thousands of Beaver photos.

 

Beaver en vol
Beaver en vol
Beaver en vol

I hope you will enjoy building and flying your Beaver DHC2!