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Message
Also, for my information, I would be interested in
the volume of your plenum as well as the length and diameter of the hoses from
plenum to throttle body.
Thanks to
Tommy, and Ed for the comments.
Ed, I've made
a note to verify the sceet tubing length, though I can give a pretty
good estimate of 9" from the TB to the plenum. The sceet
is 1.75" ID. The TB is 15" from the face of the iron housing
port. The plenum itself started as a rectangular block of foam, 8" front
to rear, 5" left to right, and 3" top to bottom. The front side was angled
off 45 degrees downward, as you can see in the pics. The rear, right
corner was rounded, also as you can see. That was the only real shaping,
aside from generally rounding the corners that didn't have flanges
attached. BTW, Spruce sells handy aluminum flanges in just about
any size you want.
I managed a
brief flight today, and established some important fact, such as where the water
comes in when it's raining (pretty much everywhere, since I haven't put any
weather-stripping on the canopy), and the best position for a drain hole in my
oil cooler scoop (big puddle of water in there). It was the typical FL
Summer day, with a few scattered showers around, but it looked fine for a local
flight. As I taxied out, there were a few drops of rain, and I could
see a dark cloud, but no lightning or wind to speak of. I proceeded to
take off, and the rain got harder until I could turn to the East.
This silly cloud was sitting right over the airport, but I could also see some
heavy rain approaching, so after a few laps, I decided to land before it got
much worse. On descent, the engine was rich, since I haven't
done anything with the dual MAP, but I didn't fiddle with it much, since it
was still running OK, and I was at pattern altitude in what was now fairly heavy
rain. The landing was uneventful, but the rain really started to come down
as I taxied back to the hanger.
There's a lot
of debate between RV guys about canopy types, tip up, tip over, or sliders, but
one thing's common to all, if you get in or out in the rain, you, and the
inside of the plane are going to get wet. Of course I was wearing the
chute today, so it's a little harder to get in and out, so it's soaked now
too. The tropical storm type rain was still going on about an hour later,
so I just left.
So, how was
the climb you ask. Naturally, it wasn't an extensive test, but with full
fuel, and rain if that counts for anything, I saw an easy 1500 fpm at 5250 rpm,
and 120 mph. I'm sure I could have got more out of it, but I just didn't
have time to do any real testing. Even from this brief flight, I'm
convinced that all is well with this intake, and aside from some more
tuning, I'll be in good shape for Rev-3 (C drive and monster
prop).
Cheers,
Rusty (a
little soggy)
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