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.