HAINES AIRCRAFT DESIGNS

Too many airplanes, not enough time.

My first aircraft design that I committed to a drawing was based roughly on the Volksplane. If nothing else, it was an exercise to understand the details of aircraft design. I started the general dimensions of the Volksplane, but revised everything to provide a slightly larger fuselage and account for a Corvair engine. Additionally, with the availability of CNC routers this was designed for manufacture by CNC.

Haines Aircraft Design

This became the basis for design on my second concept. The primary goal was to provide a similar aircraft with smoother lines. The tapered wing was included as a result of a tapered wing spar (the spar was taller at the root to account for a greater bending moment at the root).

Haines Aircraft Design

One major lesson I learned from the structural analysis of these two exercises is the inefficiency of using wood as a spar. Yep, wood has been used on many successful designs, but for creating a cantilevered wing it is simply limited, which is why most wood spars are found on low-aspect, large thickness, or short cantilevered wings or wings with struts or braces. My concept designs met traditional aircraft engineering and structural practices and may have been successful, but with the availability of sheet aluminum, it's really a no-brainer to use aluminum as a primary material.

Another design exercise was based on the Pietenpol Air Camper. Again I used the Corvair as an engine selection (only because I have one to be used). However, this was redesigned to use an aluminum skinned wing (as opposed to a wood and fabric wing) and because of this monocoque wing, I could use a single or no wing strut. The design below shows a parasol wing which is cantilevered outboard of the center section.

Haines Aircraft Design

Of course I like the concept of a two seat aircraft, but my I've always liked the idea of smaller single seat designs. Using the Corbin Super Ace as an example the next design concept was developed. The dimensions of the whole design were developed to provide a larger fuselage and account for the heavier Corvair engine.

Haines Aircraft Design

I went as as far as simulating this design in X-Plane. This allowed me to tweek design aspects to fine tune potential handling charateristics. The second revision of this design evaluated a slightly different wing arrangement. Well, the simulation flew nicely.

Haines Aircraft Design

Several of these design concepts started from a seat mockup. It was just some scrap wood to get initial dimension:

Haines Aircraft Design

A mockup of the most recent fuselage concept was made from strips of plywood and thin plywood gussets:

Haines Aircraft Design

And this will not be the end of the design itterations. One day, I'll have to use that Corvair engine on something.