AcroGimp
Joined: 11 Jun 2013
Posts: 45
Location: San Diego, CA USA
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 Posted: Sun Dec 06, 2015 4:10 pm Post subject: Prop Speed Question |
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'87 Yak-52, standard M-14P and V530 prop, ~ 970 TT.
Level flight, solo, at 6500' MSL, 610mm and WOT, pull prop lever fully aft and prop speed dropped to 66% but would not decrease further. Stabilized at 227 kph IAS, ~ 135 KTAS (not bad) - fuel flow seemed low in that it took a 'longer than normal' time to show a drop on the gages (nice).
In level flight prop speed was governing at 66% but on a slightly aggressive descent up to 300 kph prop sped up like a fixed pitch prop would, to as much as 80%.
Increasing for 70% and up prop speed acted normally and would keep selected speed basically regardless of attitude or airspeed fluctuations.
Oil temp did get cool, bottom of green/top of yellow with cooler flap basically closed, CHT's were low green.
I would expect to be able to get down to ~60% in flight. Preflight check in the runup from 70% to 52-54% works fine/reacts normally.
Ideas? Or much ado about nothing?
'Gimp
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Owner/Pilot N6209F 1987 Yak-52
COMM/ASEL/IFR/HP-Complex/TW |
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