---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 12/06/15: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 04:14:23 PM PST US Subject: Yak-List: Prop Speed Question From: "AcroGimp" '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 _____________________________________ Time: 04:16:26 PM PST US Subject: Yak-List: Prop Speed Question From: "AcroGimp" '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 _____________________________________ Time: 04:18:05 PM PST US Subject: Yak-List: Prop Speed Question From: "AcroGimp" '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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.