REFLECTOR: NACA conversion.
Dave Philipsen
velocity at davebiz.com
Sat Oct 12 19:27:20 CDT 2013
I did this awhile back on my STD FG. The cooling has improved somewhat
over the armpit scoops and I do believe I have a little less drag. I
did not do before and after tests but I would guess a top end
improvement of between 3-5 knots by taking the armpit scoops out. If I
were you, though, I don't think I'd mess with it if you don't have a
cooling problem. The reduction in drag is minimal compared to the
amount of work you'll expend on the conversion. Another drawback is
that you'll have a little less headroom for backseat passengers.
My situation was the same as yours. I didn't build the aircraft and did
not have a lot of experience with fiberglass. Nevertheless, the
fiberglass was probably the easiest part. More difficult is the
plenum/baffling.
Dave Philipsen
Velocity STD FG
N83DP
On 10/12/2013 2:26 PM, Jim & Sharon Beck wrote:
> My 173 RG with io360 lycoming has the armpit scoops. no cooling
> problems but am considering changing to the NACAs I did not build the
> aircraft so am challenged by glass work. but can find good help on
> this. Does anyone have experience on this type of project? Drag
> reduction? other advantages? I have flown 450 ? hours and have no
> cooling issues except have to watch oil on long hot climbs. Is a kit
> available? Any input would be appreciated.
> Thanks,
> Jim
> N29RP
>
>
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