Royce Wise wrote:
 >
 > Well we finally decided on which airplane we are going to build.  We had
considered
 > the Cozy, and a couple of others.
 > We decided on the IBIS for the following reasons.  They probably apply

to

us only, and
 > would have no bearing on anyone else's decisions.
 > It is a two place aircraft.
 > It is of wood construction.
 > It is lightweight, less than 600 lbs empty.
 > It is designed to use a VW type engine, or ** a rotary**. :-)
 > It is good looking.
 > It's build time is set at 2000 hrs ( you know how that goes )
 > It is small, but the cockpit is roomy, and can carry 50 lbs of luggage.
 > It can use an engine of 50 to 80 HP. My 12A's can handle that easily.
 > It's cost of construction is reasonable.
 > We have the tools etc. necessary
 > If anyone else would be interested here is a link to the designers site.
 > http://www.junqua-aircraft.com/
 > Also check out the attached photo.

       Nice airplane, but it does say you can use lighter engines but not
heavier engines siting the Continental 65HP as an example of too heavy. My
BD-4 will have wheel pants almost this big as this bird. The 12A would have
plenty of excess power for this design, but the installed weight will be that
of a O320 or more. You could scale up the plans enough to account for the
increased weight, and do a new stress analysis, if you love that shape. The
VariViggen is a Rutan designed Delta wing canard in all wood, with tandem
seating. Very fast and designed for the heavy 320s and 360s. A 12A or 13B
would work there. It has a small footprint if building space is a problem.
Lynn E. Hanover

Lynn
This is a copy of the engine section on the IBIS web site.
It includes some rotary's.
Royce

The IBIS plane has been designed for use with VW (Volkswagen) engines in the 60 to 80 HP range, i.e. engines of at least  1830 CC or any more powerful VW engine. Any four stroke four cylinder engine, without reducing gear, weighing 75 kg or less, in    good working order (and roughly equivalent to the VW or up to 20 kg lighter) presently in use or coming on line, can be mounted on the   IBIS.
    It is also possible to use the French engine "JPX 4T 75A" 80 HP, the German "LIMBACH 2000 EC" 68 HP or Australian "JABIRU  2200" 80 HP. All of these engines are without reducing gearbox.
  A two-stroke engine is not recommended as its specific consumption is much greater than that of the four-stroke engines.
Some  rotary engines can also be considered as alternative solutions. The 65 HP Continental engine, on the contrary, is too heavy and too   bulky.

 
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