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The
KR2S Project
Flaps
The
flaps on this KR2S are going to be a split flap arrangement. For
those who do not know, a split flap is one where the trailing edge
on the underside of the wing hinges down as a flap. The most
beneficial split flap size is 20-25% of the chord and operated at
angles up to 60-70o.
Invented in 1920 by Orville Wright and J. M. H. Jacobs and
patented soon after, it is very simple by design and simple to build.
A bonus for the KR2S is the split flap increases drag for reduces
the landing speed and thus the landing roll as well as lowering the
nose of the aircraft for a better view on approach. However, it
adds close to zero additional lift in a typical take off configuration
which is not an issue in the KR2S as its take off roll is relatively
short anyway.
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The initial part of the flap build can be seen on the stub wing page . A piano hinge with removable pin attaches it to the rear spar.
The flap
will be operated via a linear actuator behind the seat which will
rotate a torque tube. This tube will exit the fuselage just aft of the
rear spar and pivot the flap down via an arm attached to rod end
bearings and in turn, the flap. It will be a similar set up to that of Jeff Scott's. |
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Here
I have joined 2 HF-2A rod end bearings with a piece of 5/32" thread and
some Loctite. These bearings are smaller than the MW-3 ones used
on the elevator and rudder and
were in the AS&S bargain bin for under a buck each. I bought
10 knowing they would come in handy one day......sure enough! |
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The edge
of the flap has a 1/4" layer of flox beneath the full length and a 1
1/2" deep pocket of flox where the bolt hole has been drilled and the
double ended bearing screwed in. |
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