Re: Air Flow at canard - fuselage intersection LS1

Dave Richardson <dave@...>

Hi Peter,

Very nice Jab installation. Those are an excellent alternative. Just
wish the price were a little more affordable.

You can just see what I was talking about in the upper right photo shown
on this web site


From: Peter Harris [mailto:peterjfharris@...]
Sent: Wednesday, September 20, 2006 12:31 AM
To: Q-LIST@...
Subject: RE: [Q-LIST] Re: Air Flow at canard - fuselage intersection LS1

Dave, I made gills for cooling the Norton and have kept them for the
3300 installation. I was not aware of Burt's work. I cut "D" shaped
from the rear side cowl one each side and glassed the "D" reversed
the cowl to make inverted "gills". I think they produce no drag and
in this low pressure area they work well. But I have retained the shroud
tunnel underneath. When the shroud is closed I get a cruise CHT of
when ambient is about 77degF. These gills show up in the pics file for



From: Q-LIST@... <> [mailto:
Q-LIST@... <> ] On Behalf Of
Dave Richardson
Sent: Wednesday, 20 September 2006 1:19 AM
To: Q-LIST@... <>
Subject: RE: [Q-LIST] Re: Air Flow at canard - fuselage intersection LS1

Hi Jim,

I had similar results in some "unscheduled" oil flow tests on my Tri-Q2
with an LS1. The specific point I saw was the arched clean area about
4-5 inches above the canard / fuselage intersection. I always wondered
what the air was doing right in the contour between the canard and
fuselage. Some had suggested that it was compressing the air there
which would cause drag and less of a V shape and more of an L shape
there would help. That is a compound low pressure area from the canard
shape as well as the fuselage shape. In fact, it is low enough to suck
loose oil from inside the cowling (hence my "tests"). You know I think
Burt and co. really had it right on the Quickie by putting the major
cowling exit air out over the canard through those gills. On the Q2/xx
we try to dump the cooling air out into a high pressure area under the
fuselage and we have these two nice low pressure areas. I'm sure there
are other considerations, though. The Eagle 150 uses this area for
their cooling air exit.

Anyway, thanks for sharing the photos.

Dave Richardson

Tri-Q2 825DR 69 hrs.

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