Bob your memory is just fine. All 415C & C/D aircraft are restricted to 1260 pounds gross weight and have the greater elevator travel. The following is from the type data sheet of the 415C and C/D. You will note that the gear on some serial numbers do require a change.
NOTE 3.
S/N 113 thru 4423, and 4500 and up are also eligible as model 415-D under
terms of Aircraft Specification A-787, provided the
following requirements are met:
(a) Correct propeller and propeller limits.
(b) Correct control surface travel for the elevator.
(c) Incorporate elevator tab in accordance with Erco dwg. 415-22031
(applies to S/N 113 thru 4423 only).
(d) Instruments should be marked in accordance with FAA approved operating
limitations. (Applies to S/N 113 thru 4423 only).
(e) Include placards on the instrument panel in accordance with NOTE 2 of
Aircraft Specification No. A-787.
(f) The orifices for the main and nose gear piston should be revised as
follows:
Serial Numbers Orifice Size
Main Gear 113 thru 812 .067" diameter
Nose Gear 113 thru 1622 .281" diameter
(g) Approved FAA Flight Manual must be carried in the airplane.
(h) "No Smoking" placard should be included in the cabin.
(i) Nameplate should be altered to indicate the date of conversion, new
model number, and type certificate number.
(j) Install stainless steel upper skin in fuselage aft of firewall in
accordance with Erco dwg. 415-31245. (Applies to S/N 113 thru
4423 only).
Best regards,
Vern
(Embedded
image moved "Sydney B. Cohen" <[EMAIL PROTECTED]>
to file: 12/12/98 05:49 PM
pic03093.pcx)
To: Bob Urban <[EMAIL PROTECTED]>
cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] (bcc:
VERN HENDERSHOTT/MSL/SA)
Subject: Re: Two-Pronged Advice
Bob Urban wrote: Is my memory failing me or don't you have to
change\drill orifice size in
the main gear too when going from "C" to "D" model.
I don't think so. I find no referenc to it in the Information Letter
quoted below:
According to Ercoupe Information Letter #1: Subject: Conversion of
Ercoupes to Later Models, dated Jan 1, 1956:
"The Model 415-D Ercoupe was developed under F.A.A. regulation Part No.
03, and permitted the gross weight of 1400 pounds on the Ercoupe under
these regulations. In order to obtain satisfactory stability conditions
with power on, it was necessary to limit the up elevator travel to 9
degrees. In the opinion of the factory, this limitation seriously
affected landing qualities of the Ercoupe. For this reason, the 415-CD
was produed instread. The 415-CD had all the modifications other than
the elevator travel necessary for the 415-D, but was licensed under the
03 catagory, which still restriceted it to 1260 pounds.
"In order to convert a Model 415-CD to a Model D, it is necessary to
limit the up elevator to 9 degrees, add placards to the instrument panel
prohibiting smoking and prohibiting aerobatics, and require that the
airplane be flown in accordance with limitations in the Approved Flight
Manual. It is necessary to supply the suitable flight manual as well.
"A Model 415-CD can be converted to a Model E and achieve the 1400
pounds gross weight, and at the same time, improve the landing qualities
instead of destroying them by the use of the cut-out or "split"
elevator. With this elevator satisfactory stability is retained and the
landing characteristics improved with the up travel of 20 degrees with
the reduced area elevator. The Model E has an 85-h.p. enging and it,
therefore, is necessary to convert the engine to this power, changing or
modifying the propeller as necessary for the higher power. The other
modifiactions given above, and including the Model E Flight Manual, are
required for this conversion.
"The changes necessary to convert the Model 415-C to Model 415-D or a
Model E depend upon the serial number of the airplane, however, in all
cases it is necessary to install the stainless steel skin over the
fuselage gas tank and to make the other changes indicated for the Model
415-CD. The instrument panel should be changed to the late type and it
is desirable to modernize the airplane in other respects but these items
are not required by the F.A.A. for the increased gross weight."
Syd Cohen
NC94196
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