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Design and construction of a
Light Aircraft for a 20 HP engine.
24 Apr 04
Further investigations into the airfoil selection are creating concerns about the fact that this airfoil is only 6 inches thick and we are trying for a 36 foot wing span.  May need a deeper airfoil.  6 inches it not much thickness for a beam 36 feet long with a pilot hanging from it and an engine pushing it through the air at 80 mph..
In this part of the site you can watch my good friend Pat K. and I build a light airplane for which detailed plans and materials will be available to the general public.  Those parts that are hard to make will also be available.

The discovery of the Military Standard 4A032 air cooled engine opened up a whole new set of possibilities as regards the design and fabrication of light home built aircraft for recreational purposes.

My friend Pat K. and I are journeymen engineers and designers.  We decided we would try our hand at designing a light aircraft using the latest materials and techniques.  This is made possible by a number of factors among them the most important ones are:

1.  The availability of Pro-E the most fantastic modeling software you can imagine.  Some of the drawing we will put on the net are in Pro-E and you can download a viewer from the Pro-E web site.  We will provide instructions with the drawings.

2.  The availability of a light and powerful engine, the 4A032.

3.  The availability of light weight high strength composite materials.

4.  The need to have a truly challenging project.


The initial design specifications of the project are as follows

General description         Motor glider
Wing span                        36 feet
Wing chord                       4 feet
Weight of aircraft             600 lbs with pilot and fuel
Pilot weight                       200 lbs
Fuel                                   20 lbs
Type of tail                        V tail
Body                                  Semi-Pod with tail boom
Engine location                Pusher high behind pilot
Control                              Stick control
Controlled surfaces         "V" Tail, Ailerons, (Flaps maybe)
Airfoil                                 Flat bottom and skinny.  The Clark "Y"
Engine                               4A032, 20 hp at 3000 rpm
Propeller                           48 x 24 inch
Materials used                  Wood, composites, high strength fibers, aluminum
Proto concept aircraft      Early Piper J3s
                                           The Heath parasol LN
                                           Various home builts
                                           Modern high performance gliders

                                           What others are going
                                           Things we learned from model control line and RC planes


07 Mar 04
The Clark Y has tentaively been selected as the airfoil.  Turns out that the airfoil for the J3 the _____ is almost identical to the Clark Y.

We will build a model at 1 inch to the foot for flight testing.  This is the first thing that has to be designed

I will build an 8 or 16 foot section of full size  wing for destructive testing.  This will also be used to prove our ideas about aileron design and flaps.

Nida in Florida makes some nice high strength composite panels that we will use for the wings.  Spars Ribs, etc. Pod will be fiberglass or carbon fiber composite.

04 Apr 04
VERY PRELIMINARY IDEAS FOR  PUSHER, MOTOR GLIDER. AN INCH TO THE FOOT MODEL IS THE  NEXT THING TO BE BUILT, TO SEE HOW WELL IT FLIES.  
THIS WILL HAVE A 3 DEGREE DIHEDRAL THAT  COULD NOT GET DRAWN IN PRO E WITH MY PRESENT SKILL LEVEL.
24 Apr 04