Cees,

that was fast! I guess considering that it's coffee time over in Holland while I should be sleeping...

A quick comment. This thread is not intended to provide or seek lessons to or from anyone. Rather, I hope it to be a growing source of information related to the specific aerodynamics of classic pattern designs. I started it in the hopes of learning more about how things like Re and Cd change from one design to another - if significantly - and as a consequence, what type of power plants and prop dimensions might be best suited for given models and scales with an emphasis on electric power. E-power, by virtue of its nature, has considerably more latitude than glow power and therefore ideal power plant configurations are not always obvious.

In short, at some point it would be nice to have a little database of our models with descriptors and parameters that could serve as a reference for specifying appropriate e-power configurations.

The re-design of a classic is part of the motivation for the start of this thread.

As a comment to the end of your post:

"But the first most important les [sic] to learn is:
The more you know, the more you know you don’t know! "

That was fortunately the main outcome of an undergraduate degree and what gives me the psychological freedom to start a thread like this.

Cees, just so you know, we're not all out to get you despite the heated exchange on your Taurus thread. I suspect that much of that debate can actually be chalked up to language and cultural differences. At the end of the day, sometimes its good to "agree on disagreeing" as it leaves space for your quoted statement above to breathe again.

Enjoy your breakfast... actually it's almost time for ours [X(]

David.