Chris,
My experience of this class of aircraft is limited to 12 years and some 900 hrs
in the one LSA, an ATEC Zephyr /Rotax 912 ULS. From this I would say that 5200
to 5400 is a significant increase in rpm. In my view not quite enough for best
take-off performance but getting there some tweaking required.
You are absolutely correct when you say different props/airframes will influence
engine performance, as will your particular take-off strategy. Personally, I
use full throttle on start, only reducing when a good safe (turn back) altitude
has been achieved and then only to maximum continuous rpm (high speed climb)
until cruise altitude & leveling off, when I go to my preferred economy cruise
of 5000-5200 rpm.
Observed by many Rotax 91 engines love revs so as long as you are staying
below
the 5 minute max power and above 5200 under load, everything should just be
peachy.
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