Biplane design questions

"Kyle Boatright" wrote in message
. ..

"Chris Wells" wrote in
message ...

snip
Also, it would seem only necessary to put washout in the upper wing,
keeping the lower wing flat. Is this the case with most biplanes, or do
they put washout in both the wings?


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Chris Wells

Interesting points, but I think you've got the washout thing backwards. If
the lower wing is designed first, don't you want wash-out in it to keep
the tip from stalling first and causing a wing to drop?

KB

I intended to type: "If the lower wing is designed *to stall* first..."

Originally Posted by Kyle Boatright

"Kyle Boatright" wrote in message
. ..

"Chris Wells" wrote in
message ...

snip
Also, it would seem only necessary to put washout in the upper wing,
keeping the lower wing flat. Is this the case with most biplanes, or do
they put washout in both the wings?


--
Chris Wells

Interesting points, but I think you've got the washout thing backwards. If
the lower wing is designed first, don't you want wash-out in it to keep
the tip from stalling first and causing a wing to drop?

KB

I intended to type: "If the lower wing is designed *to stall* first..."

I figured if the top wing was still flying, there'd be enough lift to prevent a tip stall...maybe both wings need washout.

Has nothng to do with tip stalling, guys.

Look at it from a balance standpoint.

When the forward wing stalls first, there is a nose down moment created.
If the aft wing stalls first, there is a pitch UP moment created!

Which condition will help recover from the stall?


Richard (the Saber Tooth Cave) Lamb