Hi y'all,
I have not read al;l that is posted but the subject is wing tips?
Are you aware of NASA's engineer Witcomb? He added modern efforts to an
acient finding and the report says jt created a break throuh
Back in the 20s NACA investigated "tip plates" and found a positive advantage
at low speeds but that was negated by drag at higher speeds.
Witcomb apparently took that report in recent times and further developed it.
The result was positive in all respects and at all speeds.
The new finding was labeled "Winglets".
In short they increased aircraft efficency by 3% or more.
What a Winglet does>
Reduces tip vortex and thus drag
Shares performance with an increased aspect ratio without the increase.
Creates forward thrust by providing lift in a forward vector.
Examples of useage>
When Rutan uses a factor on ALL his designs he is confident they are an advantage? All Rutan designs include Winglets
Many other modern aircraft are seen with them. Most modern Airliners have them.
Some years ago I evaluated them on miniature aircraft.
Findings were very positive. Improvement was seen and was obvious.
Details are a bit extensive but if desired I will provide them via Email.
How about that?

Hal [email protected]