On the Record: RANS S-9 Chaos—Idaho

August 4, 2017

This was the first flight of the airplane. According to the witness, the airplane accelerated well, and liftoff occurred about 300–400 feet down the runway. About 2 seconds after liftoff, the airplane pitched up to a “fairly nose-high attitude” of about 15°–20°. When the airplane was at an altitude of about 150 feet and less than halfway down the runway, it descended rapidly. The airplane landed hard and sustained substantial damage; the pilot was seriously injured.

NTSB

The pilot reported that the engine performed normally and that he intentionally attempted a steep climb to ensure that he cleared trees at the end of the runway; however, due to the mid-wing configuration, he lost sight of the horizon in the initial climb and then had difficulty judging his pitch attitude due to the lack of an attitude indicating instrument. Ground personnel had radioed him about the excessive pitch attitude, and the pilot likely overcorrected.

NTSB Final Report

NTSB
Ron Wanttaja
Ron Wanttaja
Ron Wanttaja is a retired space systems engineer. During a 40-year career, he helped design, build, test, launch, and operate 18 spacecraft, including the International Space Station. On the aviation side, he has owned a Bowers Fly Baby since 1996 and flew the original prototype for seven years before acquiring his own. He lives just outside of Portland, Oregon, with his wife, romance novelist Lisa McAllister.

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Bill Lawson
Bill Lawson
10 days ago

airspeed, about the #1 instrument

Dan Marotta
Dan Marotta
10 days ago

Look at the wing tips for pitch attitude.

Layne Lisser
Layne Lisser
10 days ago

I’m with Bill … Airspeed indicator. They’re required for a reason; several in fact.

Andrew Nielsen
Andrew Nielsen
9 days ago

There is a bit of a delay with ASI. If you can’t see the horizon in a climb, the aircraft is a bad design.

MarlH
MarlH
Reply to  Andrew Nielsen
9 days ago

Not a bad design. Mid-wings, though uncommon, are not really rare. The climb attitude would have to be FAR beyond a normal climb to put the horizon “behind” the wing.

Plus, as Dan mentions–a quick glance at a wingtip will give all the info you need. And–you can see “under” the wing through the fuselage side plexiglass.

The S-9 and S-10 are very well proven designs.

I suspect unfamiliarity with the plane and possibly lack of experience may be big factors in this accident.

Glad the pilot was not more seriously injured. The plane can be repaired—fairly easily…