REFLECTOR:INTAKE COMBUSTION AIR

Sun, 14 Sep 2003 14:51:57 -0400

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I have just the one oil cooler up front and no vent for the ducting, SRG
with Franklin engine.  You can get by this way, but there are some
limitiations.  For a cold startup, there is plenty of time to taxi and
do the run-up.  However in summer if the engine is warm (stopped to get
fuel),  the oil temp will exceed 110 C (230 F) before takeoff.  I try to
do the run-up while taxiing to minimize the overheating.  Climbout is
limited to 500 ft/min or the oil temp will also exceed 110 C.  After
landing the oil temp also creeps up so you need to get parked ASAP.

John Dibble

Tom Martino wrote:

> On most of the Vs I’ve seen ... all of the air to the engine comes in
> from above through the naca vents.The air is then directed over the
> cooling fins of the cylinders.There are also 2 ducts that divert some
> of that air.One duct goes to oil cooler and the other duct provides
> combustible air for the engine.
>
> I have been wonderings if the engine would run more efficiently if I
> put a separate air intake scoop (low profile) on the lower cowl. This
> looks as if it would provide a more direct and cooler flow of air.And
> it wouldn’t divert any of the cooling air away from the cylinders.
>
> And while on the topic of cooling ... is it really necessary to have
> two oil coolers?Is the one up front good enough?
>
> I saw one Velocity that had only one (up front) then had tiny side
> vents along the fuselage which directed air into the ducting that
> carries the oil lines.
>
> So is there anyone using just one oil cooler up front and not the one
> ion the engine compartment? I would appreciate any insight into either
> of these topics.
>

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I have just the one oil cooler up front and no vent for the ducting, SRG
with Franklin engine.&nbsp; You can get by this way, but there are some
limitiations.&nbsp; For a cold startup, there is plenty of time to taxi
and do the run-up.&nbsp; However in summer if the engine is warm (stopped
to get fuel),&nbsp; the oil temp will exceed 110 C (230 F) before takeoff.&nbsp;
I try to do the run-up while taxiing to minimize the overheating.&nbsp;
Climbout is limited to 500 ft/min or the oil temp will also exceed 110
C.&nbsp; After landing the oil temp also creeps up so you need to get parked
ASAP.
<p>John Dibble
<p>Tom Martino wrote:
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<div class=Section1>
<div class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><font face="Arial"><font size=-1>On
most of the Vs I’ve seen ... all of the air to the engine comes in from
above through the naca vents.<span 
style='mso-spacerun:yes'></span>The
air is then directed over the cooling fins of the cylinders.<span style='mso-spacerun:yes'></span>There
are also 2 ducts that divert some of that air.<span style='mso-spacerun:yes'></span>One
duct goes to oil cooler and the other duct provides combustible air for
the engine.</font></font><o:p></o:p></span></div>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><font face="Arial"><font size=-1>I
have been wonderings if the engine would run more efficiently if I put
a separate air intake scoop (low profile) on the lower cowl.&nbsp;<span style='mso-spacerun:yes'></span>This
looks as if it would provide a more direct and cooler flow of air.<span style='mso-spacerun:yes'></span>And
it wouldn’t divert any of the cooling air away from the cylinders.</font></font><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span>

And
while on the topic of cooling ... is it really necessary to have two oil
coolers?Is the one up front good
enough?<o:p></o:p>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><font face="Arial"><font size=-1>I
saw one&nbsp;</span><st1:PersonName><span style='font-size:10.0pt;font-family:Arial'>Velocity</span></st1:PersonName><span style='font-size:10.0pt;font-family:Arial'>
that had only one (up front) then had tiny side vents along the fuselage
which directed air into the ducting that carries the oil lines.</font></font><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><font face="Arial"><font size=-1>So
is there anyone using just one oil cooler up front and not the one ion
the engine compartment?&nbsp;<span 
style='mso-spacerun:yes'></span>I would
appreciate any insight into either of these topics.</font></font><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span>

<p class="MsoNormal"><span style='font-size:
12.0pt;mso-no-proof:yes'></span><o:p></o:p>

<p class="MsoNormal"><span style='font-size:
12.0pt'><o:p></o:p></span></div>
</blockquote>

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