> I find the wingtips on my son???s project more than a bit odd.
++++++++++++++++++++++++++++++++++++++++++++++++++++ If you were air, would you want to meet that wing tip face to face? It looks like a real drag bucket. You can mount lights on a Horner tip just fine. https://dl.dropboxusercontent.com/u/32133949/100_5553.JPG When building, I was concerned on getting two identical tips. The method I used turned out to give me a perfect Horner tip. Is that the way they originated, by accident? The method I used was to glass the top surface of the tip first. Straight sand the tip to 90 degrees of the forward spar. Flip wing to bottom side up and draw a line inboard of the tip and parallel to the top. I used a line between two foam blocks 4 inches inboard of the tip. I think 5 or 6 inches would have been better with the thick RAF48 wing. Use the hard glass tip on the top surface of the tip and the line on the bottom to straight sand the tip. The shape changes as the thickness of the wing changes but it remains a straight line. When sanded, put a small radius on the lead edge (I used a 4 inch mixing cup) and a smaller radius on the trail edge ( I used the rounded corner of a tape measure body). Hand sand the lead edge to a nice radius and put the radius on the very thin trail edge. When finished, apply glass. It is a very easy process to duplicate and when finished I realized I had created a perfect Horner tip. The reason the tip works is because the high pressure air on the bottom has difficulty making the very sharp corner to reach the low pressure on the top of the wing, basically performing the same function as strake tip you see on airliners, etc.. Larry Flesner
