Hey Bob: The best answer is contained in Ercoupe Service Memorandum 35A. It
is a lower speed warning cushion. Apparently it was designed to provide a
power off warning to help prevent the pilot from getting too slow in the
landing
approach in the model E,G and F Ercoupe. The flight test adjustment
procedure requires changing the length of the spring to keep the power off
airspeed
at or slightly above 60 MPH with the pitch control back to the point where the
spring causes additional force to be applied to the control. (obviously
with the trim in full nose up condition)
If you are getting a constant down pressure on the elevator, I would
suggest checking the rigging in accordance with Memorandum 35A.
The 46 415CD should not have this problem unless it has been modified
with the split elevator and lower speed warning cushion spring.
Lynn Nelsen
In a message dated 2/18/2009 7:16:13 P.M. Eastern Standard Time,
[email protected] writes:
Group: Can anyone shed light on the purpose of a coiled spring 1/2" x 14"
which attaches to the elevator bellcrank and to the bottom of the tail
fuselage near the tiedown eyebolt? We have noted this spring being used on a
415E
Ercoupe and a '57 Forney. It is not shown in either the repair manual or
current Univair parts manual. It functions to place constant down pressure
on
the elevator causing a "nose down" orientation. Would the pilot have to
overcome the pressure of this spring to maintain level flight? Could this
conceivably be a modification to relieve the need for the engine to be canted
down at a 3-1/2 degree angle below the nominal thrust line, in which case the
aircraft would achieve hands off level flight? Any help with this apparent
mystery would be appreciated. Thanks.
Bob Blanchard
N94676 - 415CD
**************A Good Credit Score is 700 or Above. See yours in just 2 easy
steps!
(http://pr.atwola.com/promoclk/100126575x1218822736x1201267884/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID
%3D62%26bcd%3DfebemailfooterNO62)
