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<< Lancair Builders' Mail List >>
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I am looking for some advice for a problem that I have with the Outback flap
system on my 360. The flaps are built and fitted with the cross shaft
(torque tube) and motor. However the fit is extremely tight, since the fast
build structure does not match the plans. The rear spar is about one inch
aft of the position on the plans, and the result is that there is virtually
no clearance for the flap mechanism. From a brief conversation with
Lancair, I gather that this is pretty standard, and most people have this
problem.
The new problem is that the flaps do not travel symmetrically. The port
flap travel is about 1.5 inches greater measured at the trailing edge than
the starboard flap over the full range from 5/8" up to 8.75" down. There is
no obvious reason, but the tight clearance, and some asymmetry in the left
and right fuselage mouldings, make it difficult to assess. I need to find a
way to eliminate this differential.
I can only see two solutions. The obvious one is to drill a new pivot hole
in the torque tube crank on the port side to reduce its throw; however this
will be difficult without running into the existing hole. The other is to
move the attachment bracket that is fitted to the inboard rib on the port
flap to the rear (or the starboard bracket forward). This is the bracket
that retains the pushrod going to the torque tube crank. I could do this by
using a 1/4" phenolic spacer under the bracket, bolting the spacer to the
flap mounting holes, and the bracket to the spacer through new holes.
Has anyone got a better idea? I am very conscious of the stress on this
mechanism in flight, and do not want to create a bigger problem in the
future.
Jerry Fisher
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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