----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
on 2/15/03 7:17 PM, [EMAIL PROTECTED] at [EMAIL PROTECTED] wrote:
> Just a little more fuel for the fire:
>
> Check the McCauley type cerfificate (P-842). The 1A/B90 installed on
the C85
> has a maximum diameter of 71 inches. The same prop installed on the
O200 has
> a MINIMUM diameter of 71 inches. the caption reads, in part, "The
maximum
> and minimum propeller diameters that can be used from a vibration
standpoint
> are shown
> below. No reduction below the minimum diameter listed is permissible..."
They
> also specify "85 hp and 2575 rpm or less."
>
> This may be the most important issue, assuming you scoff at operating
> limitations... ;~)
>
> John
>
------------------------------
Yo, John
The fire's getting so low I can hardly read ;~), and I'm sure your library
is more current on this subject; but McCauley propellor information in my
latest Univair catalog (#202), p. 197 (data revised 1/1/97), NOTES, 1.b.:
"No R.P.M. restrictions are required on any Met-L-Props except for
those
models specified in notes 7, 8, 9, 15, 18, 19, and 20."
None of these notes pertain to the 1A/B90 installation we've discussed.
Certainly if I were developing an STC or operating an aircraft that could
exceed approved limits, I'd want to check this type data for where "there
be
dragons". Your "red flag" is most appreciated for future use.
Even when there's this much difference in manufacturer-originated and
distributed information, the owner/pilot will be held first responsible by
the FAA if his mechanic acts on the wrong information (presuming his butt
is
sufficiently intact after the smoke clears to care one way or the other).
So I may laugh (scoff?) and you may cry; but each of us are aware how
truly
difficult it can be to separate the wheat from the chaff...to know when
our
"homework" is done and a (properly) informed decision can be made...we do
our best and hope, at the end of each day, it's enough.
The only instructions I immediately follow without question are those from
firemen in uniform when surrounded by smoke or a man with a knife or a
gun.
Is it lemmings that follow each other over cliffs and die in large
numbers?
WRB
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