Jan Eggenfellner said:Off airport landing with a supercharged 4 cylinder. Somehow the MP went to at least 40" and boost warning lights came on. (We will try to find out why) He throttled back and landed but damaged the airplane and engine.
Builder is in good shape but obviously sad.
Jan Eggenfellner
RV7Guy said:Hi John,
What did you hear? When, where?
rv6ejguy said:If you forget to open the valve before closing the throttle, the boost will spike way up because the supercharger is a positive displacement type.
I spoke to Roger's wife just now and he's ok, plane is wrecked. We visited him several times before we started our 9A project. According to his wife, every morning he was out there flying before work and enjoying the fruits of his labor. Obviously, he is completely bummed out after putting in years of work. His wife said the canopy may have saved his life cause he crawled out from under it suffering only scratches (and a major case of depression I'm sure).videobobk said:Met Roger last year at OSH, nice guy. Sure glad he's all right, at least physically at the moment. I believe he had the same carbon fiber canopy I have, so I am very interested in how it stood this ultimate test. Anyone know about that? I know he hasn't been flying the 7A long and has to be devastated.
Bob Kelly
gbrasch said:This was not the case in this incident, Roger was taking off under full power, FYI.
rv6ejguy said:I wasn't commenting on the accident as I didn't know the facts. Merely an observation.
The only way boost can increase on a positive displacement blower system like this at WOT and constant rpm is due to either the throttle closing or the bleed failing to stay in the control position.
Since these engines use a fly by wire throttle controlled by the ECU, several inputs could have the effect of closing the throttle without pilot command.
Very glad that Roger is ok and hope he decides to repair the RV with his wife's blessing.
MrNomad said:I spoke to Roger's wife just now and he's ok, plane is wrecked. We visited him several times before we started our 9A project. According to his wife, every morning he was out there flying before work and enjoying the fruits of his labor. Obviously, he is completely bummed out after putting in years of work. His wife said the canopy may have saved his life cause he crawled out from under it suffering only scratches (and a major case of depression I'm sure).
Roger did quality work from what I could see.
Glenn: My shop is small 20x24 but it's air conditioned and we're able to work despite the Tucson heat. If you want to bring Roger's bird here so we can disassemble, I have a car trailer and will push my 9 out of the shop for a few days. If enough of us attack Roger's plane at the same time, perhaps we can salvage more than appears.gbrasch said:Thanks for the follow up comments. Unfortunately the plane is totaled, but I am already working on him doing another project.