Today's Message Index:
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1. 06:54 AM - Re: NACA cockpit cooling vents (N395V)
2. 03:03 PM - Two New Email Lists at Matronics and Wiki Reminder! (Matt Dralle)
Message 1
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| Subject: | Re: NACA cockpit cooling vents |
--> Rocket-List message posted by: "N395V" <n395v@hughes.net>
Vince,
Pulled this off the VAF website and thought about this thread when I read it.
Walter tufted the inside of a cowl and fillmed what went on.
Bet dollars to doughnuts that this is what is going on with your rocket.
Have you opened up the louvers yet and tried it?
How about an update.
> The first thing we learned is that what we learned in A&P school was just, flat,
wrong. The air does NOT come in, go to the back plate, pressurize the cowl
and go down through the fins. Nothing could be farther from the truth.
>
> The BASIC airflow is that the air enters the cowl openning at the outboard edges
of the openning. It passes along the outboard edges of the cylinders until
it gets to the back plate whereupon it turns inboard and meets the air that came
in the other side right over the spine of the engine. This results in the
air moving forward along the spine of the engine case toward the spinner where
it exits the cowl and goes over the windscreen aft! That's why you get oil spots
on the windscreen when you have an oil leak!
>
> Yep, about 70% of the air that comes in a cowl goes right back out the FRONT!
That's why smaller opennings, limiting the air IN and baffles blocking the front
are very helpful. If one tufts the cowl openning you will be surprised to
see about half of those tufts pointing straight forward TOWARD the prop when in
flight. That's the air going OUT forward.
>
> The biggest advantage in cooling is created by slowing the air down on top and
creating a large deltaP with the lower deck. That allows more air to work it's
way through the fins and allow engine heat to move into the air. It is essentially
impossible to make intelligent changes in cowl and baffle design unless
you can WATCH the airflow with the changes. They can be very counter-intuitive.
>
> We've fixed several problems that have existed for decades and we've run up on
some to which the solutions remain elusive. One in particular really has me
frustrated and downright chapped--dozens of brilliant ideas and sure-fire solutions
have failed over many months of efforts.
>
> Walter Atkinson
> Advanced Pilot Seminars
>
--------
Milt
N395V
F1 Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=37126#37126
Message 2
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| Subject: | Two New Email Lists at Matronics and Wiki Reminder! |
--> Rocket-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Listers,
I have added two new email Lists to the Matronics Line up today. These include
a Continental engine List and a Lightning aircraft List:
===========
continental-list@matronics.com
http://www.matronics.com/Navigator?Continental-List
Everything related to the Continental aircraft engine. Sky's the limit on discussions
here.
===========
===========
lightning-list@matronics.com
http://www.matronics.com/Navigator?Lightning-List
This is an exciting new design from Arion Aircraft LLC in Shelbyville Tennessee. Pete Krotje has a very nice web site on the aircraft that can be found here: http://www.arionaircraft.com/
===========
Also, if you haven't checked out the new Matronics Aircraft Wiki, swing by and
have a look. Remember, a Wiki is only as good as the content that the members
put into it. Have a look over some of the sections, and if you've got some interesting
or useful, please add it to the Wiki! Its all about YOU! :-) The
URL for the Matronics Wiki is:
http://wiki.matronics.com
Best regards,
Matt Dralle
Matronics Email List Administrator
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