flyrotary@lancaironline.net Mailing List Archive

Hi Buly, I'll have to look into that. There is a vent in the rear baggage compartment that would let air exit out the rear of the fuselage. There is also a round Plexiglas vents in each front side window that can be turned to input or exhaust air. Bob W. On Thu, 9 Mar 2006 23:18:34 -0500 Bulent Aliev <atlasyts@bellsouth.net> wrote: > Bob, if the cabin does not have exhaust path for the incoming air, > the cabin pressure will build up and the NACA scoops will be > ineffective. > Buly > > > On Mar 9, 2006, at 10:00 PM, Bob White wrote: > > > I'll add a comment that may or may not have any relevance. I have > > NACA ducts on the side of my plane that are used for cabin cooling, so > > no real back pressure to speak of. The original builder told me they > > worked marginally for that. They would sometimes flow OK, and at > > other > > times not at all. I suspect that if the plane were flown slightly > > uncoordinated, one side or the other might be blanked in the position > > they are in. This might be less of a problem on "rounder" surfaces > > but does seem to indicate some sensitivity to getting the installation > > right. > > > > Bob W. > > > > > > On Thu, 9 Mar 2006 21:25:33 -0500 > > "Ed Anderson" <eanderson@carolina.rr.com> wrote: > > > >> I was a bit disappointed in the article, myself. For instance his > >> insistence about adhering to no more than a 7-14 deg slope for the > >> diffuser is the number NACA found to be best for wind tunnels. He > >> makes no mention of many other types of diffusers (such as the > >> streamline duct with a measured (laboratory) pressure recovery of > >> 84% and can have slopes of divergence approaching 65 deg near the > >> cooler core). Almost appears as if he had never heard of K&W. > >> On the other hand, perhaps for air cooled engines, he may not be > >> that far off. The fins on the jugs of air cooled engines may not > >> offer as much back pressure as say a radiator which may make the > >> NACA duct work better. > >> > >> > >> However, there is a NACA publication on NACA ducts and here is a > >> brief extract on their conclusions about its use > >> > >> > >> Does not say they can not be used for radiators, etc, but > >> apparently they felt not the best choice for those applications. > >> Note it qualifies this conclusion a bit by referring to all > >> flight conditions. Does this imply that if you selected A flight > >> regime (say cruise) to optimize for, that it could be make to work > >> fine there? Don't know, so many questions, so little time. {:>) > >> I personally tried a NACA duct early on trying to solve my oil > >> cooling problem, didn't work for me - but, it was probably not a > >> fair test as I had other problems than just pressure recovery {:>) > >> > >> Anyhow, my $0.02 on the topic. > >> > >> Ed > >> > >> > >> > >> ----- Original Message ----- > >> From: "Bill Dube" <william.p.dube@noaa.gov> > >> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> > >> Sent: Thursday, March 09, 2006 8:58 PM > >> Subject: [FlyRotary] Re: NACA's, Cooling and Sport Aviation Mag.. > >> > >> > >>> I read that article as well. I had the same skepticism about the > >>> NACA > >>> intake for cooling. My understanding is that with an NACA inlet, you > >>> don't get the ram pressure you need to force air through a high > >>> fin-count radiator. Am I wrong about this? > >>> > >>> Bill Dube' > >>> > >>> David Staten wrote: > >>> > >>>> At the risk of invoking PL's name, anyone else read this months > >>>> Sport > >>>> Aviation mag from EAA, and notice an article on cooling that > >>>> seems to > >>>> indicate that NACA's are acceptable and adequate for aircraft > >>>> cooling > >>>> needs? I have no idea regarding the authors credentials, and I no > >>>> longer monitor PL's "newsletter".. I was curious more than anything > >>>> else... Pauls reaction, others reactions, etc. > >>>> > >>>> Translation.. yes.. I'm stirring the pot/Trolling... I figure if we > >>>> are using NACA's on the Velocity, that makes us somewhat of a NACA > >>>> supporter.. > >>>> > >>>> Dave > >>>> > >>>> -- > >>>> Homepage: http://www.flyrotary.com/ > >>>> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > >>>> > >>> > >>> -- > >>> Homepage: http://www.flyrotary.com/ > >>> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > >>> > > > > > > -- > > http://www.bob-white.com > > N93BD - Rotary Powered BD-4 (first engine start 1/7/06) > > Custom Cables for your rotary installation - > > http://www.roblinphoto.com/shop/ > > > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (first engine start 1/7/06) Custom Cables for your rotary installation - http://www.roblinphoto.com/shop/