Ed wrote:
You are still thinking like a full scale flier. Except for racers, sailplane fliers and maybe a few experimenters, nobody gives drag a second's thought.

If you go back to the first post in this thread, the topic of induced drag came up.. I was responding to that. Also, your web page makes a lot of claims about low drag. My point is that all the real measurements don't back up your claims. I agree, if you don't care about the drag, tip plates can have some advantages.

Ed said:
Besides, if we were really concerned about drag, we wouldn't ever fly a biplane!

You can do efficient biplanes. For some cases they can have performance advantages over monoplanes.

Ed said:
I'm an engineer so I know what's in books, but I am also a long time modeler (I flew my first powered plane in 1950), so I also know what works.

Ok you have be a few years on me. (I was born in 51 and didnt get around to power free flight until 1959). But I also have designed planes that got a few world records and a Harmon trophy, so yes, I have some clue about what works too.

bob