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air extractor for asw19 and asw20



 
 
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  #1  
Old October 17th 17, 02:47 AM posted to rec.aviation.soaring
[email protected]
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Posts: 109
Default air extractor for asw19 and asw20

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.

  #2  
Old October 17th 17, 04:03 AM posted to rec.aviation.soaring
JS[_5_]
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Posts: 624
Default air extractor for asw19 and asw20

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
  #3  
Old October 18th 17, 03:17 AM posted to rec.aviation.soaring
sisu1a
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Posts: 569
Default 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
  #4  
Old October 20th 17, 01:13 PM posted to rec.aviation.soaring
Dan Mockler
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Posts: 20
Default air extractor for asw19 and asw20

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?

  #5  
Old October 17th 17, 04:06 AM posted to rec.aviation.soaring
Paul Agnew
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Posts: 306
Default air extractor for asw19 and asw20

I just bought the same extractor for my ASW-19 and am waiting to install it. Mine will require a small modification to the block of wood under the opening so the front edge lip will slide in.

Did you cut the vent holes in the aft bulkhead?

Paul A.
  #6  
Old October 17th 17, 05:46 AM posted to rec.aviation.soaring
Paul Agnew
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Posts: 306
Default air extractor for asw19 and asw20

http://ljpanels.co.uk/test/index.php...traction-ducts

FYI
  #7  
Old October 17th 17, 04:05 PM posted to rec.aviation.soaring
Dan Marotta
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Posts: 4,601
Default air extractor for asw19 and asw20

Pretty nifty looking bit of kit!Â* But I'd think you'd have to make a
cover to close off the ring bulkhead aft of the vent.

On 10/16/2017 10:46 PM, Paul Agnew wrote:
http://ljpanels.co.uk/test/index.php...traction-ducts

FYI


--
Dan, 5J
  #8  
Old October 18th 17, 12:33 AM posted to rec.aviation.soaring
[email protected]
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Posts: 109
Default air extractor for asw19 and asw20

I didn’t cut the holes, but mine has a fold down wood bulkhead with a pretty gap (about 1/2 inch) around the perimeter. That gap was large enough that I though I’d give it a try before cutting the holes. I was happy with the result, so I’ll probaby not cut the holes. The fiberglass bulkhead has a tighter fit, so you may ne d the holes.

John
  #9  
Old October 17th 17, 05:08 PM posted to rec.aviation.soaring
Ramy[_2_]
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Posts: 601
Default air extractor for asw19 and asw20

Curious what you mean by "how well it works". The theoretical small performance improvement will be very difficult to measure if possible at all. Or do you refer to the reduced cockpit noise?

Ramy
  #10  
Old October 17th 17, 06:12 PM posted to rec.aviation.soaring
Paul Agnew
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Posts: 306
Default air extractor for asw19 and asw20

The purpose of the extraction vent is to increase the available airflow to the cockpit. The ASW-19 has NACA vents under the wing roots to draw air in, but there is no clear path for it to exit. The extraction vent, and modification of the bulkhead to allow airflow, gives the air someplace to go and reportedly greatly increases the comfort level in the cockpit. Noise reduction is primarily due to being able to keep the canopy vent closed and a reduction of "pressurized" air leaking under the canopy seals.

Any performance benefits are a bonus in my book and not a serious consideration unless you are a hard-core performance tweaker looking for every .1% gain.

Paul A.
 




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