ES wrote, On 2/23/2014 3:49 PM:
I'm trying to use Paul Remde's very handy "Reichmann to Cambridge and
SeeYou" spreadsheet to derive some usable SeeYou polar numbers for my
Diana-1. But I'm having a heck of a time picking three
speed/sink-rate pairs from the data set that result in Max L/D and
Best Glide Speed numbers that pass the sniff test.

For example, I can enter 3 pairs of values from early, middle, and
late in the data set, and it tells me I have a max L/D of 49
(wouldn't that be nice!) at ... 38 km/h. Uh, that's well below stall
speed!

Is there any conventional wisdom on this?

Are there any other tools available that can take a set of sink rates
(hopefully more than 3) and produce some decent numbers?

Wishing the flight computers would just start with lookup tables,

Put in the values for an ASW 27. If after flying a few flights that
seems to pessimistic, put in the values for the next step up. Accuracy
in the polar isn't important to success.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)