air extractor for asw19 and asw20

On Monday, October 16, 2017 at 8:03:30 PM UTC-7, JS wrote:
On Monday, October 16, 2017 at 6:47:55 PM UTC-7, wrote:
I just installed a very cool - pun intended - air extractor in my ASW19.. Its a nifty device that replaces that little hatch cover where the control connections are. My guess is that it was made on a 3D printer. Anyway, I couldn’t believe how well it worked and so I’m putting a shameless plug for that thing here. I got it from an outfit in the UK called LJ Panels. I don’t often get carried away raving things, but this one is the cats meow.

Is it anything like the ones that Paul Hanson sold years ago?
Jim

They are similar, but they adopted the dual 'louver' type outlet the Jonkers team came up with. No form on treatment on the interior. Te parts are laser sintered nylon so finish is quite rough (something between sandstone and wood) until primed/sanded, though some Polyprimer and sanding would make them really nice.

My guess is they work at least as well if not better due to having higher surface area with the double outlet even with the forward louver is partly blocked by the attach point, though likely to make a bit more noise with the air hitting the outlet without any organization taking place on the inside..

Wish I would have made my test pod to quantify this stuff, but never did though I do still make/sell the hatches I have been in fiberglass, prefinished with PCL 907 white to a #320 grit

At 02:17 18 October 2017, sisu1a wrote:
On Monday, October 16, 2017 at 8:03:30 PM UTC-7, JS wrote:
On Monday, October 16, 2017 at 6:47:55 PM UTC-7,
wrot=
e:
I just installed a very cool - pun intended - air extractor in my
ASW19=
.. Its a nifty device that replaces that little hatch cover where the
contr=
ol connections are. My guess is that it was made on a 3D printer.
Anywa=
y, I couldn=E2=80=99t believe how well it worked and so I=E2=80=99m
putting=
a shameless plug for that thing here. I got it from an outfit in the
UK
=
called LJ Panels. I don=E2=80=99t often get carried away raving things,
b=
ut this one is the cats meow.
=20
Is it anything like the ones that Paul Hanson sold years ago?
Jim

They are similar, but they adopted the dual 'louver' type outlet the
Jonker=
s team came up with. No form on treatment on the interior. Te parts are
las=
er sintered nylon so finish is quite rough (something between sandstone
and=
wood) until primed/sanded, though some Polyprimer and sanding would
make
t=
hem really nice.

My guess is they work at least as well if not better due to having higher
s=
urface area with the double outlet even with the forward louver is partly
b=
locked by the attach point, though likely to make a bit more noise with
the=
air hitting the outlet without any organization taking place on the
inside=
..=20

Wish I would have made my test pod to quantify this stuff, but never did
th=
ough I do still make/sell the hatches I have been in fiberglass,
prefinishe=
d with PCL 907 white to a #320 grit

After installing a Nixon special in my 20, I heard a burbling sound coming
from
the vent.
I reduced the size of the extractor opening using mylar.
Each flight I would trim another 1/8 inch until the airflow, in the
cockpit,
returned to original levels. Very nice setup.....
I now hear air leaking around the flap while in negative settings.

What sounds are heard due to this design?