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"Conventional wisdom" is - every engine should have a filter to
keep sand (and other hard parts) out of engine.
I think the key phrase
is conventional wisdom. There's no doubt that dirt and such will
eventually wear out an engine, all evidence suggests that it's going to take a
long time to do that on a rotary in our application. As you likely know,
Tracy has never had a filter, and flies off a grass strip. I can't
think of anyone who's verified damage from anything that came from
outside the engine, though it can certainly happen.
On the other hand, there
have been plenty of engines damaged by items that came from somewhere within the
engine itself (intake, TB, etc). If anything, I think I'd like to have a
screen between the intake and side housings, except that I'd be worried about
the screen itself eventually breaking and getting
ingested.
I do agree that the
best plan (space permitting) would be to have two air sources, filtered, and
unfiltered.
Rusty (unfiltered,
unshaven, unwashed... )
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