Sorry I am away from dimona so no photos but I fitted either side of cockpit two NACA inlets with a ball vent which opens and closes. I copied what the HK36 has.
I found the one on top of cowl was limited for air for ventilation and that flap is not reliable. I guess it can supply air to canopy but from memory the hk36 has no air going onto canopy. This on top h36 is a poorly shapped NACA in my opinion. I believe 1. the shape of NACA is critical with little nick near wide part. 2. A sharp edge on the NACA upper serface 3. A wing section on the right angle end of NACA on inside and this sucks air in to cabin. 4 is the angle of ramp but its is less critical I believe. 5 the alignment we ith airflow is moderately important (I put thick black string where they were going and had it photographed on landing so I had the air flow line) A friend did his thesis year on NACA air intakes and explained it one wet no flying day. Ian Mcphee +61 428847642 On Wed, 6 Oct 2021, 11:15 Tom Preisser <t...@ecoflight.com> wrote: > I am not clear what you mean, Ian. > Tell me more please. > > On Tue, Oct 5, 2021, 19:51 Ian Mc Phee <mrsoar...@gmail.com> wrote: > >> I gave up on it and fitted 2 side NACA ducts as per HK36. >> >> I think that flap is opposite to what you think. >> >> Ian McPhee >> +61 428847642 >> >> On Wed, 6 Oct. 2021, 05:46 Tom Preisser, <t...@ecoflight.com> wrote: >> >>> Gentlemen, >>> For many years now I have wondered why someone ( Factory ? Thais ? ) >>> bent the bottom of the flap that shuts off air through the fresh air >>> louvres and canopy demister vents. I have assumed that it fluttered in the >>> open position, and the bend was to prevent this from happening. However, >>> with this bend it will no longer completely seal the incoming air ( or rain >>> ) entirely, nor will it allow an unobstructed flow of fresh air through the >>> duct when open ( due to interference with the screen ). Were I to >>> straighten the bend to obtain a flat flap, I would not be able to open the >>> flap fully. >>> What do yours look like? >>> Cheers, >>> Tom. >>> >>> --------------------------------------------------------------------- >>> You are subscribed to the Dimona Owners Group mailing list. >>> This list is archived in public. http://waikeriegliding.com/dog/ >>> To unsubscribe, send email to: dog-unsubscr...@lists.riverland.net.au >> >>
