REFLECTOR: Engine cooling NACA scoops

John Dibble aminetech at bluefrog.com
Thu Jul 17 06:52:01 CDT 2008


     What diameter is the ducting from the scoops to the plenum?  Mine is 4 1/2"
     and I have good cooling on my Franklin.  Also, are the CHT sensors located
     on the same side of the cylinder as where the cooling air comes from?  If on
     the opposite side, the CHT readings will read perhaps 100 F higher though
     the cooling of the cylinder is the same.

John

Dave Philipsen wrote:

> I have been struggling with marginal cooling on my STD FG equipped with
> armpit scoops.  The only way I can keep cool enough during cruise is to
> fly above 6000 feet and run LOP.  I have been somewhat successful at
> bringing the temps down by repairing/reworking the baffling and seals as
> well as doing a little rework on the scoops themselves but I'm still not
> happy with it.  I'm seriously thinking about retrofitting it with the
> overhead NACA  vents and downdraft cooling.  My question is:  Does
> anyone have templates that I could borrow/acquire so I don't have to
> guess about the size and positioning?  Also, should I expect to see a
> small improvement in cruise speed with the NACAs after removing the
> armpit scoops?
>
> --
> Dave Philipsen
> Velocity STD-FG
> IO-360
> N83DP
>
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