Edge 540 27.4% Build
03-20-2014, 04:45 AM
#776
More important is how the incoming air is ducted over the cooling fins. Just like full scale aircraft it is important to have baffles in place in order to force the air over the head and out the bottom. You can cut out the whole bottom of a cowl and still have an overheating issue because the air is just sort of swirling around going nowhere. Search for a guy name Pe Riviers over in the gas engine thread, he has passed away, but his knowledge of proper cooling is excellent.
Nice big cowl Vincent, you don't want to have a lot of compressed hot air running around in a few mini tordadoes stuck up against the firewall. That only helps reduce the amount of incoming cooling air. Air exit space should be 2 to 3 x the incoming air space. Very nice build__________________
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03-20-2014, 11:03 AM
#777
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[HR][/HR]And more important if air flows too quickly through a cooling plenum it does not have time to collect heat, which is often the case where only a front end guide is used. A plenum, properly constructed slows the airflow, permitting time for the collection of BTU's. The front of the cylinders generally run considerably cooler than the rear, leaving a lot of room for further heat collection as the air flows to and through the cylinder fins to the rear of the cylinder. In effect, in a correcly designed cooling plenum, cool air (relatively) is still introduced to the back of the cylinder. The hottest part of a cylinder is usually right around the exhaust outlet, so capturing that area does a lot all by itself.
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Last edited by box car; 03-20-2014 at 11:06 AM.
03-21-2014, 02:52 AM
#778
Thread Starter
Here are a couple of photos I shot of my Edge last night with the wings and tail installed. Not much more building left, then I can get ready for glassing the fuse.
03-21-2014, 04:59 AM
#780
Thread Starter
Thanks Tom. I weighed the plane as you see it in the last photos, the engine and muffler are under the cowl and the elevator servos and rudder servo are also installed. So far I'm at 11.4 pounds. My target weight is 16 pounds, it will be close...I hope to make it!
YOU CAN USE IT TO MOVE WITH ALSO, THATS HOW I WOULD TRY TO SELL THE IDEA TO THE WIFE.
03-28-2014, 02:50 AM
#790
Thread Starter
No glass yet Leroy, on top of the kaos that is my life at home, at work I have been prepping/training two of my students for an upcoming national automotive competition in NYC. This has been taking a LOT of my time. My poor Edge has been neglected! I'm lucky to just have the time to check in on your progress and the progress of Robert's creation as well as Kevin's SW!
Steve, no luck as of yet but a lot of window shoppers...
Steve, no luck as of yet but a lot of window shoppers...
03-29-2014, 07:25 AM
#792
Thread Starter
Had a couple of hours to build this morning so I thought I would tackle the throttle servo placement. This location was not the place the plans had called for, I decided to put it here to shorten the throttle cable and have better access. The tray was reinforced with some balsa tri-stock underneath and epoxied into place.
03-29-2014, 01:53 PM
#795
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You can add the foam if you want, but it is not necessary on a gasser. I recommend double sticky Velcro instead.
Last edited by ghoffman; 03-29-2014 at 01:57 PM.
03-29-2014, 02:07 PM
#796
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Vincent,
Was just curious. When I was following your SW build you took the same (or similar) trip with a couple of students.
How long have you been taking students to comps and how have you faired over the years if its been multiple times ?
Kevin
Was just curious. When I was following your SW build you took the same (or similar) trip with a couple of students.
How long have you been taking students to comps and how have you faired over the years if its been multiple times ?
Kevin
03-30-2014, 02:29 AM
#797
Thread Starter
Thanks for the tip Gary...
Kevin, I have been entering my students in several competitions for the past 30 years. This event (National Automotive Competition ) in NYC I didn't go to last year but have gone many times over the years, too many to remember exactly maybe around 12 times or so...thanks for asking
http://www.nationalautotech.com/
Kevin, I have been entering my students in several competitions for the past 30 years. This event (National Automotive Competition ) in NYC I didn't go to last year but have gone many times over the years, too many to remember exactly maybe around 12 times or so...thanks for asking
http://www.nationalautotech.com/
Last edited by VincentJ; 03-30-2014 at 02:32 AM.
03-30-2014, 06:04 AM
#800
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Originally Posted by [email protected]
I've heard that on gasses, but I guess old habits die hard. I still surround my fuel cells with foam ( or at least underneath them).
YMMV