Today's Message Index:
----------------------
1. 07:46 AM - NACA cockpit cooling vents (Frazier, Vincent A)
2. 12:05 PM - Re: Rock...cockpit air (JOHNTMEY@aol.com)
3. 01:01 PM - Jim Ayres (Stuart Smith)
4. 07:15 PM - Re: Re: Rock...cockpit air (Bill and Janet Asbell)
5. 09:25 PM - Re: Cylinder Hold Down nuts (Bowen Miles)
Message 1
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| Subject: | NACA cockpit cooling vents |
Cc: <rocket-list@matronics.com>
--> Rocket-List message posted by: "Frazier, Vincent A" <VFrazier@usi.edu>
James,
I can't tell you where the best spot is, but I can tell you where it
doesn't work on my airplane
http://vincesrocket.com/2003-10-20/finished%20cowl%20paint%201.jpg
I have a NACA scoop on each side of the fuselage for the front seat and
a scoop under the wing (placement like an RV-8)which supplies the rear
seat.
If I hold my hand in front of the air blast from the front outlet and
the rear outlet at the same time, I can feel a HUGE temperature
difference between the two. The rear seat outlet (from under the wing)
is at least 20 F cooler than the front outlet.
I can only speculate as to why this is. I tried taping over the cowl
seam on the assumption that hot air was leaking out of the cowl seam.
No change. Maybe hot air is spilling back out of the engine inlets? My
engine temps are very good so I'm not about to fiddle with them.
I know that simply going fast will heat the air, something like 7 degree
F. But that doesn't explain why the front and rear outlet temps are so
different. And the temps stay different at all speeds.
I'd like for someone who really knows to post it to the list.
All I know for certain is that I'm changing the spot where my cockpit
cooling air comes from before summer arrives. Probably take it from
under the wing like the rear vent. Thank goodness that my firewall is
well insulated on both sides!
Vince
-----Original Message-----
From: James Baldwin [mailto:jamesbaldwin@dc.rr.com]
Sent: Tuesday, February 21, 2006 6:36 PM
Subject: cockpit cooling vents
Hey Vince -
You said your cockpit cooling air is too hot. Not sure where you put
your vents but wouldlike to know so I don't put mine in the wrong place.
I was going to use NACA inlets under the canopy/fuselage parting line
but ...?
I saw one take the front air right out of the engine upper cowl inlet
area at the back of the baffle that cools the engine. Not for me, but
would like to know where is best. Thanks. JBB
Message 2
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| Subject: | Re: Rock...cockpit air |
--> Rocket-List message posted by: JOHNTMEY@aol.com
Gents, Regarding cooling air for the cockpit, I have the same concern.
At this point, I have only 15 hrs on the ship, each one flown on a sunny
SoCal day. I needed good vent air whether the OAT was 40f or 80f. Rear air is
NACA vent connected like Van's RV8 plan using wing air. This works good. I
can reach around from my seat and flip the eyeball open or shut.
On first flights, my front eyeball blew hot air no matter what. It was
rigged using air from top of engine baffle to Van's mechanical mix valve (cold
side) and muff air (warm side, same valve). It was obviously leaking hot air
no
matter how the mix valve was set... I disconnected the heat muff (removed
scat hose) and taped over the mix valve inlet hot side, so it is mechanically
locked to receive only the cool baffle air. It works fine now. Air is cool
and fresh at flying speeds. Haven't put a T- probe there yet to compare
with rear pit air.
Conclusion: Tapping cockpit air from top baffle is OK and effective.
I also need to tap some of that front air for radio cooling. When I reach
up under the panel in flight, those buggers are hot-hot after a while. Can't
be good. My front eyeball is located such that I can direct air up towards
the stack... that helps some but is only a temp solution. I was going to put
in a NACA scoop to vent the instrument section but your current list
discussion has me wondering.
John M N5800
Message 3
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--> Rocket-List message posted by: "Stuart Smith" <ssmith@lacsd.org>
Jim Ayres - If you would like to follow up on the HR II tail fairing,
contact me off list at ssmith@lacsd.org. Thanks - Stu Smith.
Message 4
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| Subject: | Re: Rock...cockpit air |
--> Rocket-List message posted by: "Bill and Janet Asbell" <cottonwood@charter.net>
#32 air from both sources mentioned seem to be REAL close in temp into the
office. One under the wing and the other right side of the fuse. !?!?!?!?!?!
----- Original Message -----
From: <JOHNTMEY@aol.com>
Sent: Wednesday, February 22, 2006 2:02 PM
Subject: Rocket-List: Re: Rock...cockpit air
> --> Rocket-List message posted by: JOHNTMEY@aol.com
>
> Gents, Regarding cooling air for the cockpit, I have the same concern.
>
> At this point, I have only 15 hrs on the ship, each one flown on a sunny
> SoCal day. I needed good vent air whether the OAT was 40f or 80f. Rear
> air is
> NACA vent connected like Van's RV8 plan using wing air. This works good.
> I
> can reach around from my seat and flip the eyeball open or shut.
>
> On first flights, my front eyeball blew hot air no matter what. It was
> rigged using air from top of engine baffle to Van's mechanical mix valve
> (cold
> side) and muff air (warm side, same valve). It was obviously leaking hot
> air no
> matter how the mix valve was set... I disconnected the heat muff (removed
> scat hose) and taped over the mix valve inlet hot side, so it is
> mechanically
> locked to receive only the cool baffle air. It works fine now. Air is
> cool
> and fresh at flying speeds. Haven't put a T- probe there yet to compare
> with rear pit air.
>
> Conclusion: Tapping cockpit air from top baffle is OK and effective.
>
> I also need to tap some of that front air for radio cooling. When I
> reach
> up under the panel in flight, those buggers are hot-hot after a while.
> Can't
> be good. My front eyeball is located such that I can direct air up
> towards
> the stack... that helps some but is only a temp solution. I was going to
> put
> in a NACA scoop to vent the instrument section but your current list
> discussion has me wondering.
>
> John M N5800
>
>
>
Message 5
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| Subject: | Re: Cylinder Hold Down nuts |
--> Rocket-List message posted by: Bowen Miles <cessna170bdriver@yahoo.com>
>From cessnaparts.com
71133 NUT
(List Price: $ 21.52) Stock Available $ 19.37 (EA)
71134 NUT
(List Price: $ 16.91) Stock Available $ 15.22 (EA)
Chris Fordham <fconsult@telus.net> wrote:
--> Rocket-List message posted by: "Chris Fordham"
Hi All
Would anyone on the off chance have any cylinder hold down nuts for a IO540
C4B5 p/n 71133 and 71134. Also looking for 4 rocker arms 2 intake 2 exhaust.
Thanks
Chris
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