There are two possible conflicts builders should be aware off before
"freezing in" the rudder pedal mountings and floor panels.
1) the stainless steel firewall mod. seems to have been designed as if it
the cranks were not there, as they pass through the plane of the
suggested design. To clear them, large unfillable holes are needed thus
defeating the object of a firewall. There seems to be no reason why a
one-piece plate(with just a bend at top and bottom) should not be fitted
in the plane of the vertical members of the landing gear frame (just in
front of the bungee cord) where there is no conflict. The only holes
needed are for the lugs and cables. It has to be divided at the middle,
of course to get it in , as with the upper two plates of the supplied
design.
2) This applies to the Rotax 912 engine. The rudder cranks must clear
adequately and certainly not penetrate the following space:
Centred on the lower lugs, extend a cone with starting diameter 1 3/4"
forward for 3/4" to a diameter of 2". (This takes you to the lugs of the
engine frame). The 3/4" dimension will decrease somewhat when the rubbers
are compressed. There is precious little room here (if any) and it is
pretty disastrous if you have to remove the floors. You might get some
alleviation by just shimming the base of the tufnol pedal bearings to
move the pedals upwards, and other gymnastics, like using smaller
washers, shorter sleeves, smaller thimbles and filing bolt heads etc. on
the cable attachment.
Graham Clarke G-EMIN No.83
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