From: "dimple_kwok" <henry.kwok@...>
Date: Tuesday, August 10, 2004 9:02 PM
Subject: I have a major realisation about the Bug
Date: Tuesday, August 10, 2004 9:02 PM
Subject: I have a major realisation about the Bug
I have been building a few bugs and they never flew really well in my
hands. Today I looked at the plan again and suddenly I realised
something that I have missed before! The airfoil is not flat
bottomed! If one draws a line perpendicular to the TE of the rib it
will intersect at the bottom of the LE notch rather than along the
bottom of the airfoil! It may have been obvious to you all but I have
always assumed that the airfoil is flat bottomed and thus make and
mount the wing as such. By doing this I am sure I have given the wing
a huge positive incidence and I have the feeling that this is one of
the contributing factors why my previous bugs never few well.
The other problem I have is the wing never sit securely on the
fuselage but rather rocking with the wingtips seesawing.
Now looking at building my 4th attempt - Apart from building the wing
as a semisymmetrical one as what the airfoil would suggest I have
also decided to change the fuselage to one that is used in apogee hlg
designed by mark drela. Certainly I will use 2 locating dowels at the
LE of the wing to eliminate the rocking problem. This fuselage will
also have a thinner profile and straigher pushrod runs which I am
sure will help.
Does anyone has good way to produce the wing the way it is intended
to be?
Thanks
Henry