Gents,
Maybe interesting to look back on a part of the learning curve of the experiment to make these (aerodynamic ugly) holes in the D tube.
See these thread and posts:
Post 121 the idea:
Since I also found it to be much better than the usual sheet shear webs, I used it too on an another wing. I bet it's really light! http://www.rcuniverse.com/forum/fb.asp?m=9703376
Post 123 my first comment:
http://www.rcuniverse.com/forum/fb.asp?m=9703376
and read the posts until post 134
http://www.rcuniverse.com/forum/fb.asp?m=9708957
And the successful end of the curve:
ORIGINAL: doxilia
Oh,
whatever you do, I recommend you don't attempt the D-tube lightening trick I did. I was taken to task on this experiment in a serious way - understandably so. There are all sorts of ARF's that have lightened D-tube sections but they are typically square. the round holes were not liked by the aerodynamicists.
But as they say, the proof is in the pudding. I will fly it, experimentally as I mentioned, and confirm that it makes a difference on a model like this. Somehow I doubt I'll notice a difference in flight behavior other than due to its exceedingly low wing loading. But I'm excited to be proven wrong!
David.
I always write my posts based on facts. People arn't always happy with that, but that take time. They learn.
Cees