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Post by splischke on Nov 3, 2011 22:47:38 GMT -5
I found this video on another forum. The Sonerai is a clean design but as you watch the video, think about the round exhaust stacks that many of us use and the drag they produce. Jeff has his cut flush to the cowl but mine protrude into the airstream slowing me down. www.youtube.com/watch?v=ftq8jTQ8ANE |
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Post by schrome on Nov 4, 2011 6:34:26 GMT -5
Incredible! I never would have guessed that the drag of a round shape was that much higher.
Ed
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hans
Full Member
Posts: 166
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Post by hans on Nov 4, 2011 13:28:47 GMT -5
Incredible! I never would have guessed that the drag of a round shape was that much higher. Ed Aye! For more information on this topic I encourage anyone to read Hoerner's books... Speaking of which, here is a partial listing of my aero library: ibis.experimentals.de/nicetoknow/favoritebooks/favoritebooks.html Both Hoerner books are listed too, what else  cheers Hans |
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Post by schrome on Nov 4, 2011 17:01:47 GMT -5
Thanks, Hans, I'll put them on my Christmas list.
That's a very nice site you have and even though I'm happy you're a Sonerai owner I'm at the same time a little a sad you won't be finishing the Ibis project. It's a nice plane. The efficiency of an airplane with a canard is appealing.
Ed
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Post by n3480h on Nov 4, 2011 17:33:42 GMT -5
Cool old video with timeless information. Snappy dresser, too.
Tom
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Post by daddo2 on Nov 4, 2011 17:40:35 GMT -5
Wow! I've been thinking about streamlining my 5/8" gear. What's the best way to go about it? I've seen photos of gear legs with fairings, and at least one who's gear was filed round on the leading edge. How much will rounding the leading edge reduce the strength of the gear?
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Post by soneraifred on Nov 4, 2011 20:41:20 GMT -5
I don't think that radiusing the leading edge of the gear would remove enough material to affect the strength of the gear. I think what would be equally important from the streamlining perspective would be eliminate the bluntness of the trailing edge of the gear by adding a fairing. Actually, I think a full airfoil shaped cover for the entire gear would be more effective.
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Post by Schmleff on Nov 5, 2011 21:25:47 GMT -5
My gear is ground on the front and faired on the trailing edge. No effect on stiffness that I can tell, but I never flew it any other way.
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Post by Schmleff on Nov 5, 2011 21:43:33 GMT -5
Awesome video BTW!
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Post by juergen on Nov 7, 2011 3:48:47 GMT -5
Hi Scott,
your exhaust produce additional a big gas-ball on the end of the stacks and this gas-balls must be speed up by the aircraft speed. That's additional resistance.
with best regards
Juergen
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Post by n3480h on Nov 7, 2011 12:06:14 GMT -5
Juergen, Paser's book refers to this kind of drag as "plume" drag. It makes sense. I bet there is a lot more on most aircraft than we might suspect, with even small gaps between control surfaces. I suppose the exhaust would have to be pointed aft to minimize drag. I'm still not able to figure out whether a lightweight stub is best, or would a heavier system exiting at the bottom rear cowl cutout be best?
Tom
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