REFLECTOR:Belly NACA

[John Dibble]

My SRG had two small fresh air NACAs about eight inches behind the nose gear door,
each with a hole in the floor, centered in the floors for the pilot and copilot.
Nearly most of the time there was no air coming in from the pilot side.  Once during
takeoff in gusty conditions there was a brief blast of warm air (I assume from the oil
cooler outlet).  When I would engage the heat flap, I would get a strong flow of
unwanted cold air.  Don't know about the copilot side and the NACAs are now glassed
over.

John

CBarber wrote:

> As y'all may know, I plan to use a Mazda Rotary on my SE fixed gear.  With
> the engine mount I already have, there is ample room to position a full size
> radiator under the engine mount angled facing forward.  Unlike the duel
> NACA's that need to be split on top of the fuselage and go to each bank of
> cylinder heads for a Lyc/Frank/Cont, I should only need one air source to
> the radiator set up to provide adequate cooling.  I have seen this done with
> a NACA scoop installed on the bottom of a Cozy but the under the engine set
> up on another Velo I saw had a "big ol' scoop hanging under the fuselage
> (which is not my preference).
>
> Do y'all see a problem with me doing this on my Velocity. I would appreciate
> the groups input as to problems I may encounter or reasons this may be a
> bone-head idea. My thoughts as to issues I need to address include:
>
> 1) Do NACA's work ok on the bottom of the plane?  Yep, start with the
> basics. I have read contradictory views on NACA's use.  Some seem to love
> them on their Velocity's, some don't.