Hi kevin,
No numbers, just some observations. After his first flight in a Duo Discus, a
friend of mine said,
"This thing won't climb or cruise".

To which, I asked, "How much water do you have in the tail ?"

He replied, "Nothing"

To which, I said, "Fill it up"

After his second flight in the Duo Discus (with water in the tail) My friend
said, " This is a damned GOOD machine.

End of my observstions concerning tail ballast in a ship with 2 pilots of 200+
lbs. each
:)


JJ Sinclair