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Date: Mon, 21 Jun 2010 10:54:28 -0400
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From: Sky2high@aol.com
Subject: Re: [LML] Eyeball Air Hoses
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Rob,
 
OK.  I have the 3/4" lines and I mounted eyeballs on both the NACA and  the 
panel. Plus the passenger NACA has another 1/2" takeoff that goes to the  
avionics stack.  The NACA mounted vents are used to keep the lower body  cool 
as heat will eventually make its way through the firewall and the nose  
wheel well even though the areas are covered with insulation.  When fully  open 
the vents can create a tornado in the cockpit, reordering a nice stack of  
charts and plates.  The only drawback to those NACAs is the admission of  
NOISE - prop, engine, slipstream and eagles screaming to get out of the  way.
 
BTW, vent efficiency is highly dependent on adequate cockpit air  exit.  At 
180 KIAS my cockpit is 300 feet higher than the aircraft altitude  and the 
exiting air is mainly down the elevator console/push rod tunnel and out  the 
openings in the vertical stabilizer that provide for elevator  movement.  
There is probably some canopy seal leakage also.
 
In the pix I sent you can see the foot well eyeballs in the bottom of the  
left and right panel pix (the pix quality wasn't that great after it got cut 
 down passing thru the internet.  It was 15C outside and the pilot panel  
eyeball was almost closed and the passenger side was open but not pointed at  
me.  Also, that tube shown in the center console pic is used to reach the  
foot well eyeballs for adjustment.
 
Grayhawk
 
PS I've flown in AZ - if you wear a snakeskin covered baseball cap and a  
silver wristband you stay cool.
 
 
In a message dated 6/21/2010 7:21:34 A.M. Central Daylight Time,  
rwolf99@aol.com writes:

Greyhawk -
 
Yes, my eyeball air hoses are 1.5 inch SCAT.  Reports from earlier  Lancair 
builders suggested that the panel-mounted air vents provided  insufficient 
air.  Many builders mounted the eyeball vents directly to  the sidewall NACA 
ducts to get more air.  But you know all this -- you  were part of the 
early crowd.
 
The eyeball vents from Lancair came with a cap for a  tiny,  tiny SCAT tube 
coming in from the side.  Maybe 3/4 inch.   Small.  I bought adapters from 
Jon Pastusek (also available from aircraft  spruce) which allowed a 1.5 inch 
SCAT tube to go directly to the back of the  vent -- no 90 degree turn 
required.  I hope to have plenty of air.
 
If it's too much, I'll close it partway.  But I live in Arizona now  and I 
suspect that I'll have it wide open.
 
- Rob  Wolf


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<DIV>Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>OK.&nbsp; I have the 3/4" lines and I mounted eyeballs on both the NA=
CA and=20
the panel. Plus the passenger NACA has another 1/2" takeoff that goes to=
 the=20
avionics stack.&nbsp; The NACA mounted vents are used to keep the lower bo=
dy=20
cool as heat will eventually make its way through the firewall and the nos=
e=20
wheel well even though the areas are covered with insulation.&nbsp; When=
 fully=20
open the vents can create a tornado in the cockpit, reordering a nice stac=
k of=20
charts and plates.&nbsp; The only drawback to those NACAs is the admission=
 of=20
NOISE - prop, engine, slipstream and eagles screaming to get out of the=20
way.</DIV>
<DIV>&nbsp;</DIV>
<DIV>BTW, vent efficiency is highly dependent on adequate cockpit air=20
exit.&nbsp; At 180 KIAS my cockpit is 300 feet higher than the aircraft al=
titude=20
and the exiting air is mainly down the elevator console/push rod tunnel an=
d out=20
the openings in the vertical stabilizer that provide for elevator=20
movement.&nbsp; There is probably some canopy seal leakage also.</DIV>
<DIV>&nbsp;</DIV>
<DIV>In the pix I sent you can see the foot well eyeballs in the bottom of=
 the=20
left and right panel pix (the pix quality wasn't that great after it got=
 cut=20
down passing thru the internet.&nbsp; It was 15C outside and the pilot pan=
el=20
eyeball was almost closed and the passenger side was open but not pointed=
 at=20
me.&nbsp; Also, that tube shown in the center console pic is used to reach=
 the=20
foot well eyeballs for adjustment.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Grayhawk</DIV>
<DIV>&nbsp;</DIV>
<DIV>PS I've flown in AZ - if you wear a snakeskin covered baseball cap an=
d a=20
silver wristband you stay cool.</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 6/21/2010 7:21:34 A.M. Central Daylight Time,=20
rwolf99@aol.com writes:</DIV>
<BLOCKQUOTE  style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARG=
IN-LEFT: 5px"><FONT    style=3D"BACKGROUND-COLOR: transparent" color=3D#00=
0000 size=3D2 face=3DArial><FONT    color=3Dblack size=3D2 face=3Darial>
  <DIV>Greyhawk -</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Yes, my eyeball air hoses are 1.5 inch SCAT.&nbsp; Reports from ear=
lier=20
  Lancair builders suggested that the panel-mounted air vents provided=20
  insufficient air.&nbsp; Many builders mounted the eyeball vents directly=
 to=20
  the sidewall NACA ducts to get more air.&nbsp; But you know all this --=
 you=20
  were part of the early crowd.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>The eyeball vents from Lancair came with a cap&nbsp;for a &nbsp;tin=
y,=20
  tiny SCAT tube coming in from the side.&nbsp; Maybe 3/4 inch.&nbsp;=20
  Small.&nbsp; I bought adapters from Jon Pastusek (also available from ai=
rcraft=20
  spruce) which allowed a 1.5 inch SCAT tube to go directly to the back of=
 the=20
  vent -- no 90 degree turn required.&nbsp; I hope to have plenty of air.<=
/DIV>
  <DIV>&nbsp;</DIV>
  <DIV>If it's too much, I'll close it partway.&nbsp; But I live in Arizon=
a now=20
  and I suspect that I'll have it wide open.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>- Rob=20
Wolf<BR><BR></DIV></FONT></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>

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