A tach check is a necessary first step especially if the aircraft is new to
the owner. A question to also ask is how does the KR perform. What is
the dynamic RPM? How much take off run, how many FPM in climb. Can he
carry a passenger and if so how many FPM. I ran a Sturba 54X52 on my 1910
type 4 and could get 3000 RPM. I felt that the 54 inch prop was too much.
It would seem to me that 47 pitch if accurate would be good. Mid 70's out
of 80 on a leak down test is only saying 93 %. I would look for the
cylinder leakage and correct for leaking valves or rings especially if the
KR was inactive over some period of time.
Orma
Southfield, MI
N110LR Soon to celebrate 20 years
