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Preflight tests (was: Corvair engine failure)

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mtherr(at)yahoo.com
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Posted: Wed Apr 19, 2006 2:42 am Post subject: Preflight tests (was: Corvair engine failure)

Before we did the first flight with my  Soob powered

601-HD, I'm glad we did a lot of testing on the

ground.  Actually, the engine ran for approximatively

15 hours before flying.  During the first few hours,

we discovered that my ignition setup was bogus.  I

tried using Mitsubishi pickups with IC107 coils.  We

burned both coils within a few hours.  With the

Mitsubishi pickups we need the IC12 coils with

appropriate resistors.



Then, later, after final inspection, but before 1st

flight, I discovered my engine mount was not good (it

flexed - inappropriate design).  I got somebody to

modify its design in the field.  



We also did a traction test on the ground with the

plane attached to a scale.



On the day of the 1st flight, my test pilot did

several acceleration runs on the runway with no

intention to fly.  When he got comfortable that he

reached 50mph in a short enough distance (and that the

engine ran well), then he lifted off.  



After 1st flight, we modified the prop pitch.



I don't know if we can run an air cooled engine on the

ground at full rpm for a long period (that was not an

isssue with the soob).  I know that if we did not do

that, my aircraft would not have served me for long.



Michel

----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

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