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Date: Mon, 24 Jan 2011 14:54:06 -0500
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Subject: Cooling firewall forward components
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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 pai=
n 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 shrou=
d 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 sh=
eet metal work.

Finally, I have recently seen cooling shrouds for the engine mounted mecha=
nical 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 relay=
s.  And I have a separate breaker for the pitot heat.  Everything else goe=
s 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 tu=
rn it off, but nothing has both except for the pitot heat.

Thanks for the comments, guys!

- Rob Wolf


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Scott -</div>


<div>&nbsp;</div>


<div>You are right.&nbsp; I forgot that the engine compartment of my tight=
ly-cowled Lancair is probably hotter than my old Cessna.&nbsp; So&nbsp;a=
 cooling blast tube to the regulator area is a good idea.&nbsp; I'll do th=
at, as it would be a pain to move the regulator now (not impossible, just=
 a pain).&nbsp; Not so worried about the battery but maybe I should be.&nb=
sp; The failure mode there is more benign (short battery life) so I may ju=
st take that as it comes.</div>


<div>&nbsp;</div>


<div>I had been concerned about cooling of the Dukes pump and the gascolat=
or, which are both on the hot side of the firewall.&nbsp; I bought a cooli=
ng shroud from Lancair but it was designed for the Lancair 4 fuel pump, I=
 think, as it didn't come close to fitting.&nbsp; If anyone has a suggesti=
on for a pre-made part I'd like to hear it.&nbsp; I'm not very talented wh=
en it comes to sheet metal work.</div>


<div>&nbsp;</div>


<div>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 airpla=
ne.&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 its=
 own breaker.&nbsp; When you pull the breaker it also cuts power to the Bo=
sch relays.&nbsp; And I have a separate breaker for the pitot heat.&nbsp;=
 Everything else goes through the Control Vision power distribution system=
.&nbsp; So I think I've met your criteria of everything having either a sw=
itch or a breaker to turn it off, but nothing has both except for the pito=
t heat.</div>


<div>&nbsp;</div>


<div>Thanks for the comments, guys!</div>


<div>&nbsp;</div>


<div>- Rob Wolf<br>
<br>
</div>


<div style=3D"CLEAR: both"></div>
</font>

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