Today's Message Index:
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1. 04:14 PM - Prop Speed Question (AcroGimp)
2. 04:16 PM - Prop Speed Question (AcroGimp)
3. 04:18 PM - Prop Speed Question (AcroGimp)
Message 1
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| Subject: | Prop Speed Question |
'87 Yak-52, standard M-14P and V530 prop, ~ 970 TT.
Level flight, solo, at 6500' MSL, 610mm and WOT, pull prop level 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.
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
--------
Owner/Pilot N6209F 1987 Yak-52
COMM/ASEL/IFR/HP-Complex/TW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=450776#450776
Message 2
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| Subject: | Prop Speed Question |
'87 Yak-52, standard M-14P and V530 prop, ~ 970 TT.
Level flight, solo, at 6500' MSL, 610mm and WOT, pull prop level 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.
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
--------
Owner/Pilot N6209F 1987 Yak-52
COMM/ASEL/IFR/HP-Complex/TW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=450777#450777
Message 3
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| Subject: | Prop Speed Question |
'87 Yak-52, standard M-14P and V530 prop, ~ 970 TT.
Level flight, solo, at 6500' MSL, 610mm and WOT, pull prop level 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.
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
--------
Owner/Pilot N6209F 1987 Yak-52
COMM/ASEL/IFR/HP-Complex/TW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=450778#450778
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