Hi Rick,
Your plane, serial number 3372, N2747H was completed 9/12/46. Have you
ordered the FAA CD for it?
That should give you all information as to what engine was on your
aircraft originally and any subsequent changes documented by filed and
approved forms 337.
I know that Project #571, Report #1 indicates an objective to compare
the effectiveness of the Lord J-2079-2 Conical Sandwich Engine Mounting
to the standard grommet type mounting by shake and flight test. It
contains drawing No. SC-2802 dated 11-8-45 (Lord Manufacturing Co.,
Erie, PA).
Tests were conducted using ERCO's NX2094H with the standard engine,
rubber grommets and mount as in present production and then with a
modified engine, (above) Lord mounts, and modified supporting structure
(engine mount). This ship was completed 8/1/46 and taken over "new" by
ERCO's Engineering Dept.
So, while we can't specifically connect your plane with the Lord
mounts, it is known that ERCO had started working on such an
installation beginning just six weeks before your bird came off the
production line. Perhaps Continental and/or Lord would have more
information.
Regards,
William R. Bayne
.____|-(o)-|____.
(Copyright 2010)
--
On Jan 28, 2010, at 23:04, rickeason2000 wrote:
OK guys,
Got a good one for you. The 'C' Model that I have been restoring &
assembling for the past two years was getting close. We were fitting
the cowling on, and having a very difficult time making it work. The
zero time engine that is on it, has been hanging there about 6 years,
so we decided to change the mounts. Here is where the problem begins:
I obtained a new set of the standard Continental mounts, we hoisted
the engine & begin to replace them. To our surprise, what was in there
was a set of larger Lycoming mounts! This assembly included a bolt
spacer. I appear to have a case that nobody has seen before. The most
current logbook (starting in 1966) lists the engine as a C-75-12,
Serial #276-5-12. Data plate says the same thing. The case is slightly
different than another one that I have w/ serial #4XXX. My case was
built on 3/12/1946, and both halves have casting numbers one digit
off.
So, did someone filed modify this case somewhere in the past 60
years or do I have some kind of mutant? It appears the Lycoming mounts
will work, I just can't find a legal basis for it.
Unfortunately, if I can't come up with a Legally (FAA) acceptable
solution I feel compelled to remove/replace this zero time engine and
sell it to an EAA guy or for parts.
I would love to hear options,
Rick Eason
