---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Mon 05/29/06: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 06:54:18 AM PST US Subject: Rocket-List: Re: NACA cockpit cooling vents From: "N395V" --> Rocket-List message posted by: "N395V" 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 _____________________________________ Time: 03:03:46 PM PST US From: Matt Dralle Subject: Rocket-List: Two New Email Lists at Matronics and Wiki Reminder! --> Rocket-List message posted by: Matt Dralle 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