The summary and conclusion paragraphs from the TR 664 are depicted below. We will get to the mod, but to understand the rationale and conclusions are important, I think.
I know the TR is a long read and full of "engineering-speak," but I did want to cover some of the major points.
Furthermore,
There has been considerable debate as to the best flap span/aileron span proportions.
Andy Lennon, my hero, published several articles in Model Airplane News back in the early 90's regarding high lift devices and R/C aircraft. He favored a larger percentage flap span, upwards of 60%.
http://www.mosquitobiteplanes.com/robin.html
When you look at Andy's
Robin design, you can see that he favored bigger (spanwise) flaps and shorter spanwise, but longer chord, ailerons.
This mod's flap span comes out to around 47%. Purely a design consideration, it comes to that according to rib bay spacing.
On to the mod.....
Now that the covering and the aileron has been removed (which will be the basis for our new flap), I removed and saved the trailing edge and the ancillary rib segments for re-construction of the areas outboard of the flap.
I also removed material inboard to the first center wing box rib bay. This will be our flap cove area.
