Chipsair 2

Update of the first Chipsair that crashed due to unknown reasons.

Just lost it while spinning, maybe because the battery voltage dropped too far while tossing it around. Hence this one has a voltage display...

Update was build in very similar way to the first Chipsair but possibly a little stronger: Extra thin ply in the elevator, added bracing in the aft of the fuselage.

Wingspan	1.58 m
Wing Area	36.34 dm2
Tail	50 cm
Tail Area	6 dm2
Weight	2012 g
Wing Loading	55 g/dm2
Length	1.1 m
Airfoil	Eppler E197
Engine	OS MAX 46 LA (blue)

First flight on December 22, 2011, where I noticed at the field that the aileron hinges where actually not glued in, yet! So for the first flight scotch tape held them in place, and I tried to avoid aileron use to keep them attached to the wing.

The pictures also still show the push-pins on the windshield because I'm not sure if the glue is 100% dry.

This might have been the last plane where I could use the Pacer ZAP hinge glue that seems to become unobtainable.

Overall it flies GREAT. Plenty power, plenty authority from aileron and elevator, which I had worried about. Very nice and slow landings, while on the other hand endless loops and quite some vertical performance.

Chipsair Wackeltest

A scratch-built airplane for testing the OS 'Wankel' rotary engine.

Wingspan	150cm
Wing Area	34.5dm2
Airfoil	Eppler 197
Elevator	6.25dm2
Stabilizer	3dm2
Weight	1700g
Wing Loading	49g/dm2

A basic high-wing design with a slight old-timer look. Building started with the wing, using the E-197 outline printed with Profili. The rest was designed ad-hoc based on which pieces of wood happened to be available and what 'looked about right' with maybe a little inspiration from the DeHavilland Beaver to get the stabilizer outline and some 'round' windows on the side. Details of the front were determined after the rest of the plane was already covered to locate the engine such that the CG would be at 25% of the wing cord.

To reduce stress on the wankel engine, full-throttle runs are limited. In addition, the oil content of the fuel is raised by adding 2oz castor oil per gallon.

The plane flies great, like a trainer, but with more than enough power for vertical climb-out after takeoff. Most of the time I fly at 1/3 throttle. At full throttle it can flip and roll like crazy. On landings, it bounces easily if still at 'floating' speed.

KCRC Model-of-the-Month July 2010.