The aft fuselage
reinforcement that was done on my Legacy was done on the recommendation of
Greg Cole (One of the designers of the Legacy). He directed where and how much
to strengthen the aircraft. He said with that modification the aircraft is
good up to .6 Mach. I have had mine to .56 Mach at FL230. It has been done on
several Super Legacys. I think you can order the “Reno Race Mod” through
Lancair if you tell them at the time you order a Legacy kit. They will
incorporate the mod in the kit when it is
manufactured.
Our planes are good,
but they do have areas that can be improved and Greg has improved the Legacy.
Even if you don’t want to race, I have confidence that Greg Cole knows what he
is doing and my Legacy is stronger (safer) because of the race
mod.
Lynn
Farnsworth
Super
Legacy
TSIO-550
Powered
Race #44
From:
Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of
Steve Colwell
Sent: Wednesday, August 19, 2009 6:03
PM
To:
lml@lancaironline.net
Subject: [LML] Strength vs.
stiffness
I don’t pretend
to know anything about flutter, strength or stiffness other than you can get
in trouble “improving” the strength of an airframe. From what I have
read over the years, unless a proven problem exists you might create one by
making changes. One example is a 6’ tapered fishing rod that will
support say 25 lbs.. If you clamp it to a table with one foot hanging
over the edge, it will break with a 10 lb. load. Even I can
understand that example. All the factors that affect flutter are way
beyond me.
Tail shake is
occurring every time a Legacy applies full power for takeoff. If you
want to see for yourself, watch the tail of a Legacy (or probably most highly
powered prop planes) when the brakes are set and full power is applied.
The tail is moving around A LOT. Apparently it’s not a problem since the
high time airframes seem to be doing just fine. After thousands of hours
maybe our composite airframes will have structural problems (like the Cessna
210
I
understand).
Steve
Colwell
Legacy