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Date: Tue, 25 Jan 2011 16:46:54 -0500
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Subject: Re: [LML] Cooling firewall forward components
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Rob,
 
OK, here's more. 
 
Make sure that water passed through the blast tube cannot get into the  
regulator.  I left my regulator on the engine side of the firewall  because, as 
you said, it would be a pain to move it.
 
Since you are probably using a Lycoming engine with a  fuel distribution 
system that does not allow circulation of cool fuel  and you will be operating 
in a hot climate exacerbated by global/solar warming  in July, you should 
consider such cooling.  In the summer I have  experienced engine pump 
cavitation whilst "lining up and waiting" for a  long time, thus requiring the use 
of the boost pump to add enough pressure to  keep the fuel in its liquid 
state.  Not fun if the boost pump  is suffering from the same condition.  I 
hope your engine monitor  has an idiot light for low fuel pressure - it will 
generally light up  a few seconds before the engine stops.
 
You have checked that the battery (heavy object) mount is sufficient not to 
 work harden from constant vibration and to keep it in place under heavy  
G-loads (+ and-)?  Some years ago the bracket for a permanent remote mount  
oil filter (heavy enough) was known to give it up after a few hundred  hours. 
 
Electrics:  Well, have you considered all the important  unswitched ones?  
Electric turn coordinator, Air data computer, Engine  Monitor, etc?
 
Scott
 
In a message dated 1/24/2011 1:54:24 P.M. Central Standard Time,  
rwolf99@aol.com writes:

Scott -
 
You are right.  I forgot that the engine compartment of my  tightly-cowled 
Lancair is probably hotter than my old Cessna.  So a  cooling blast tube to 
the regulator area is a good idea.  I'll do that,  as it would be a pain to 
move the regulator now (not impossible, just a  pain).  Not so worried about 
the battery but maybe I should be.  The  failure mode there is more benign 
(short battery life) so I may just take that  as it comes.
 
I had been concerned about cooling of the Dukes pump and the gascolator,  
which are both on the hot side of the firewall.  I bought a cooling  shroud 
from Lancair but it was designed for the Lancair 4 fuel pump, I think,  as it 
didn't come close to fitting.  If anyone has a suggestion for a  pre-made 
part I'd like to hear it.  I'm not very talented when it comes  to sheet 
metal work.
 
Finally, I have recently seen cooling shrouds for the engine mounted  
mechanical fuel pump in the catalogs, but I haven't seen one on an  airplane.  
What do y'all think about those?  Do we need them?
 
As for electrics, I forgot to mention that my hydraulic pump has its own  
breaker.  When you pull the breaker it also cuts power to the Bosch  relays.  
And I have a separate breaker for the pitot heat.   Everything else goes 
through the Control Vision power distribution  system.  So I think I've met 
your criteria of everything having either a  switch or a breaker to turn it 
off, but nothing has both except for the pitot  heat.
 
Thanks for the comments, guys!
 
- Rob  Wolf


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<DIV>Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>OK,&nbsp;here's more.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Make sure that water&nbsp;passed through the blast tube cannot get in=
to the=20
regulator.&nbsp; I left my regulator on the engine side of the&nbsp;firewa=
ll=20
because, as you said, it would be a pain to move it.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Since you are probably using a Lycoming engine with a=20
fuel&nbsp;distribution system that does not allow&nbsp;circulation of cool=
 fuel=20
and you will be operating in a hot climate exacerbated by global/solar war=
ming=20
in July, you should consider such cooling.&nbsp; In the summer I have=20
experienced engine pump cavitation&nbsp;whilst "lining up and waiting" for=
 a=20
long time, thus requiring the use of the boost pump to add enough pressure=
 to=20
keep the fuel in its liquid state.&nbsp; Not fun if the boost pump=20
is&nbsp;suffering from&nbsp;the same condition.&nbsp; I hope your engine=
 monitor=20
has an idiot light for low fuel pressure -&nbsp;it will&nbsp;generally lig=
ht up=20
a few seconds before the engine stops.</DIV>
<DIV>&nbsp;</DIV>
<DIV>You have checked that the battery (heavy object) mount is sufficient=
 not to=20
work harden from constant vibration and to keep it&nbsp;in place under hea=
vy=20
G-loads (+ and-)?&nbsp; Some years ago the bracket for a permanent remote=
 mount=20
oil filter (heavy enough)&nbsp;was known to give it up after a few hundred=
=20
hours.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Electrics:&nbsp; Well, have you considered all the important=20
unswitched&nbsp;ones?&nbsp; Electric turn coordinator, Air data computer,=
 Engine=20
Monitor, etc?</DIV>
<DIV>&nbsp;</DIV>
<DIV>Scott</DIV>
<DIV>
<DIV>In a message dated 1/24/2011 1:54:24 P.M. Central Standard 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>Scott -</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>You are right.&nbsp; I forgot that the engine compartment of my=20
  tightly-cowled Lancair is probably hotter than my old Cessna.&nbsp; So&n=
bsp;a=20
  cooling blast tube to the regulator area is a good idea.&nbsp; I'll do=
 that,=20
  as it would be a pain to move the regulator now (not impossible, just a=
=20
  pain).&nbsp; Not so worried about the battery but maybe I should be.&nbs=
p; The=20
  failure mode there is more benign (short battery life) so I may just tak=
e that=20
  as it comes.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>I had been concerned about cooling of the Dukes pump and the gascol=
ator,=20
  which are both on the hot side of the firewall.&nbsp; I bought a cooling=
=20
  shroud from Lancair but it was designed for the Lancair 4 fuel pump, I=
 think,=20
  as it didn't come close to fitting.&nbsp; If anyone has a suggestion for=
 a=20
  pre-made part I'd like to hear it.&nbsp; I'm not very talented when it=
 comes=20
  to sheet metal work.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Finally, I have recently seen cooling shrouds for the engine mounte=
d=20
  mechanical fuel pump in the catalogs, but I haven't seen one on an=20
  airplane.&nbsp; What do y'all think about those?&nbsp; Do we need them?<=
/DIV>
  <DIV>&nbsp;</DIV>
  <DIV>As for electrics, I forgot to mention that my hydraulic pump has it=
s own=20
  breaker.&nbsp; When you pull the breaker it also cuts power to the Bosch=
=20
  relays.&nbsp; And I have a separate breaker for the pitot heat.&nbsp;=20
  Everything else goes through the Control Vision power distribution=20
  system.&nbsp; So I think I've met your criteria of everything having eit=
her a=20
  switch or a breaker to turn it off, but nothing has both except for the=
 pitot=20
  heat.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Thanks for the comments, guys!</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>- Rob=20
Wolf<BR><BR></DIV></FONT></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>

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