Mark: By NACA ducts do you mean "scavenger" exhaust systems where the open exhaust pipe is in the narrow throat of a venturi like exhaust stack to aid in reducing exhaust back pressure and cool the exhaust?
Don ------------------------------------------------------------------------ Mark Langford wrote: > Somebody mentioned the March 2006 issue of Sport Aviation article on engine > cooling, which states that NACA ducts don't work so great in reverse. This > is what I have on my plane, and I don't know about cooling, but I can tell > you that pointing your exhaust pipes at the narrowing duct doesn't work so > great. I guess it works to some extent, but you can imagine that thing > probably gets pretty hot. > > When I came up with this bright idea, I found the original NACA paper that > touted it as both an inlet and an outlet, but later research apparently > exposed problems with the outlet part of the theory. Unfortunately, I didn't > read that one! Bottom line is that mine would probably work better as a > simple ramp that never tapers. Keep that in mind if you are deciding to > copy that feature of my airplane. > > I got some more flying in this afternoon, flying up to Sewannee, TN for a few > landings on their 3600' runway that's famous for its treachery, being perched > on the side of a mountain. I did a touch and go, but after realizing that > the runway was uphill and had some awfully tall trees on the far end ( ! ), > the rest of my landings were "full stop".... > > Mark Langford, Huntsville, Alabama > see KR2S project N56ML at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
