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For: Scott Dahlgren et al

Hi Ed,
This is another alternative to the mechanical system you refer to.  I have
spent 3 months trying to work out a system that would be mechanical yet
elegant.  This has been accomplished with flattering results.  The system
is not flight checked so the real results are yet to be proven.  I am still

putting in  the main gear so there will be many months to go to prove this
out.

The system uses a telescoping push rod driven by an extra long bolt through

the rod end of the main gear cylinder.  This telescoping rod pushes on a
bell crank which is linked to the inboard door.  As the main gear is on the

up stroke the telescoping push rod is moving. It's telescoping action
creates a delay while the gear is moving up.   While it's not yet bottomed
out the inboard door is spring loaded over center and locked in the open
position.  Once the gear gets to a prescribed angle the push rod bottoms
out.  With the bottoming out, the bellcrank is then rotated, linking the
inboard door to the up position.

In the down cycle, part of the telescoping push rod follows the main
cylinder rod end attachment.  This allows a spring to pull, on the inboard
push rod, to to rotate the bellcrank and pull the door (along with help
from airloads), to the open, "overcenter and locked" position.  Even in a
slip the inboard doors will stay locked open.

The builder has to make up the pushrods so that a small rod end can be
screwed to the ends.  The length of pushrods is a trial/error fitting.
Once the system is installed/working and the checknuts tightened, there is
no further adjustment to make.

My push rods are stainless steel (one hollow, one solid) and are a perfect
slipfit.  They could be just about any material which is stiff, slipfit and

lasting.

There are no pictures of this system, sorry.

Jerry Grimmonpre'                 LNC2

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