Hi Ed,
This trim system is illustrated in the Ercoupe Parts Catalog, Fig.
21, page 30. The panel-mounted crank tensions a single cable from
the instrument panel to a pulley on the inside upper firewall, thence
down to a pulley on the inside lower firewall (below the floorboard)
and back to the elevator arm assembly at the rear of the fuselage
that the elevator cables also attach to. There is a spring between
the middle of the elevator arm and the elevator horn to which the
elevator bellcrank pushrod attaches. Tensioning the cable and spring
moves the elevator sufficiently to decrease the "free" glide speed as
previously described.
At least that is how I read the diagram. Two of my three coupes have
this trim system. One has been apart since 1982 undergoing
restoration and the other is awaiting its turn hanging between my
hangar trusses up high just under the roof (inaccessible). Perhaps
Don, who is a mechanic, could better explain the trim system in his
bird and how it works?
Regards,
WRB
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On Aug 30, 2010, at 22:12, Ed Burkhead wrote:
Bill,
That explains a lot.
The serial numbered Ercoupes up through 212 act as I had described
in my message, trimming at 130 mph or so as they would have no
control over the elevator at all if the regular control cables failed.
Can you tell us more about the trim system on those intermediate
serial number Ercoupes, from 213-1622? How is it connected and how
does it work? Especially, how does it work if he elevator control
cables fail?
Ed
