 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
mark.bitterlich(at)navy.m
Guest
|
 Posted: Mon Dec 07, 2015 8:45 am Post subject: [Non-DoD Source] Prop Speed Question |
 |
|
Personally.... I would not worry about it. In fact my aircraft behaves pretty much the same. There are going to be a lot of airplanes out there where the prop settings in the hub and the govenor stop settings are a tad different from plane to plane or engine to engine so each owner will experience slightly different results. I am more concerned about the upper limit, and that in a dive it does not exceed maximum RPM and that in the middle everything works as it should... but at the full lower stop, with power applied to the engine, and then pointing the nose down... heck, you just run out of prop movement and there is nothing else that can happen EXCEPT for RPM to go up, unless you have full feather, and we do not.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com [owner-yak-list-server(at)matronics.com] on behalf of AcroGimp [jlknolla(at)aol.com]
Sent: Sunday, December 06, 2015 7:14 PM
To: yak-list(at)matronics.com
Subject: [Non-DoD Source] 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
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
|
|
|
| Back to top |
|
 |
McFly
Joined: 21 May 2012
Posts: 101
Location: Scottsdale, AZ
|
| Posted: Mon Dec 07, 2015 9:14 am Post subject: [Non-DoD Source] Prop Speed Question |
|
|
I had a similar experience in the Yak 50 with V530 John.
I was told it is a known issue with original 2 bladed props; as speed comes up so does RPM. I can't remember what my maximum speed attained in a dive before bumping up against the 82% max continuous limit but it was significantly under the Vne.
Todd McCutchanT-34A & Yak-50
Cell: (260) 402-1740
E-mail: todd(at)fastaircraft.com (todd(at)fastaircraft.com)
www.fastaircraft.com
On Dec 7, 2015, at 8:42 PM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich(at)navy.mil (mark.bitterlich(at)navy.mil)> wrote:
| Quote: | --> Yak-List message posted by: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich(at)navy.mil (mark.bitterlich(at)navy.mil)>
Personally.... I would not worry about it. In fact my aircraft behaves pretty much the same. There are going to be a lot of airplanes out there where the prop settings in the hub and the govenor stop settings are a tad different from plane to plane or engine to engine so each owner will experience slightly different results. I am more concerned about the upper limit, and that in a dive it does not exceed maximum RPM and that in the middle everything works as it should... but at the full lower stop, with power applied to the engine, and then pointing the nose down.. heck, you just run out of prop movement and there is nothing else that can happen EXCEPT for RPM to go up, unless you have full feather, and we do not.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] on behalf of AcroGimp [jlknolla(at)aol.com (jlknolla(at)aol.com)]
Sent: Sunday, December 06, 2015 7:14 PM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: [Non-DoD Source] Prop Speed Question
--> Yak-List message posted by: "AcroGimp" <jlknolla(at)aol.com (jlknolla(at)aol.com)>
'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
========================== -- Please Support Your Lists This Monthder's Bookstore www.buildersbooks.c; http://www.matronics.com &==========================bsp; - The Yak-List Email Forum -http://www.matronics.com/Navigator?Yak-List
http://forums.matr====================================================sp;   href="http://www.matronics.com/contribution">http://www.matronics.com/con=============================================
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
|
_________________
Todd McCutchan
Fast Aircraft
T-34A - N134FA
KDVT Hangar 33-13
Cell - 260.402.1740
Email: todd@fastaircraft.com
Skype: tmccutchan
Web: www.fastaircraft.com & www.flyams.com |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
