The Murphy Builders Site

Remember when building your floats fellas, that the main gear retract/extend
mechanism is supposed to be pushed "over centre" just before it hits that
stop bolt to lock "gear down". The manual calls out an AN -12A bolt or
something along that line for the stop bolt and the actual bolt length that
is needed is generally a -5 or -6 to get the throw set properly. You need
to play with the assembly while unhooked from the cylinder clevis and get
the stop bolt set so that the mechanism is definitely going over centre. It
doesn't need to go any great distance over centre.. just enough to guarantee
that on landing that the weight tries to push it even more over centre
against the stop bolt. If you aren't over centre then the weight is going to
retract the hydraulic cylinder.

I am currently, trying to install, a set of floats that where dropped off
here for install. Unfortuately, I'm not actually installing them at this
point, as I am spending hours correcting building errors that this
unfortuate customer shouldn't be paying for twice... as the builder claims
to have done 5 sets of these floats. Maybe I now know why people have had
problems with their hydraulic lines blowing apart... they aren't setting up
the main gear to go over centre and lock, so when they land the entire
landing force is then transmitted into the hydraulic system and that shock
pressure is probably into the thousands of psi!

Wayne





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