Today's Message Index:
----------------------
1. 08:45 AM - Re: [Non-DoD Source] Prop Speed Question (Bitterlich, Mark G CIV NAVAIR, WD)
2. 09:14 AM - Re: [Non-DoD Source] Prop Speed Question (Todd McCutchan)
3. 09:32 AM - CJ6 weight and balance info (Larry Pine)
4. 09:32 AM - CJ6 weight and balance info (Larry Pine)
Message 1
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| Subject: | 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@matronics.com [owner-yak-list-server@matronics.com]
on behalf of AcroGimp [jlknolla@aol.com]
Sent: Sunday, December 06, 2015 7:14 PM
Subject: [Non-DoD Source] Yak-List: 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
Message 2
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| Subject: | Re: 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 u
p so does RPM. I can't remember what my maximum speed attained in a dive bef
ore bumping up against the 82% max continuous limit but it was significantly
under the Vne.
Todd McCutchan
T-34A & Yak-50
Cell: (260) 402-1740
E-mail: todd@fastaircraft.com
www.fastaircraft.com
> On Dec 7, 2015, at 8:42 PM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitter
lich@navy.mil> wrote:
>
bitterlich@navy.mil>
>
> Personally.... I would not worry about it. In fact my aircraft behaves pr
etty much the same. There are going to be a lot of airplanes out there wher
e the prop settings in the hub and the govenor stop settings are a tad diffe
rent from plane to plane or engine to engine so each owner will experience s
lightly different results. I am more concerned about the upper limit, and t
hat in a dive it does not exceed maximum RPM and that in the middle everythi
ng works as it should... but at the full lower stop, with power applied to t
he 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@matronics.com [owner-yak-list-server@matronics
.com] on behalf of AcroGimp [jlknolla@aol.com]
> Sent: Sunday, December 06, 2015 7:14 PM
> To: yak-list@matronics.com
> Subject: [Non-DoD Source] Yak-List: 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 a
t 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 aggressi
ve descent up to 300 kph prop sped up like a fixed pitch prop would, to as m
uch as 80%.
>
> Increasing for 70% and up prop speed acted normally and would keep selecte
d speed basically regardless of attitude or airspeed fluctuations.
>
> Oil temp did get cool, bottom of green/top of yellow with cooler flap basi
cally closed, CHT's were low green.
>
> I would expect to be able to get down to ~60% in flight. Preflight check i
n 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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>
>
Message 3
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| Subject: | CJ6 weight and balance info |
I have already searched the archives for CJ6 datum points and station infor
mation and have seen info that debear has =C2-offered as well as some oth
ers. =C2-Each one of these come up with different results. =C2- Realizi
ng that it doesn't make a difference where 0 datum is located, as long as a
ll stations are in reference to that datum....final CG should be the same.
The problem is, =C2-using the Wt & Ball sheets I have found, =C2-all gi
ve drastically different CG locations. =C2- Can one share CG information
they are using, =C2-that you have confidence in. If I can find two that m
atch, =C2-I'm golden. =C2- Short of that, =C2-I may have to drop line
s and measure. =C2- Don't =C2-like reinventing the wheel when I know th
is issue had already been answered. =C2- Thanks for your help in advance.
=C2-Larry=C2-
Message 4
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| Subject: | CJ6 weight and balance info |
I have already searched the archives for CJ6 datum points and station infor
mation and have seen info that debear has =C2-offered as well as some oth
ers. =C2-Each one of these come up with different results. =C2- Realizi
ng that it doesn't make a difference where 0 datum is located, as long as a
ll stations are in reference to that datum....final CG should be the same.
The problem is, =C2-using the Wt & Ball sheets I have found, =C2-all gi
ve drastically different CG locations. =C2- Can one share CG information
they are using, =C2-that you have confidence in. If I can find two that m
atch, =C2-I'm golden. =C2- Short of that, =C2-I may have to drop line
s and measure. =C2- Don't =C2-like reinventing the wheel when I know th
is issue had already been answered. =C2- Thanks for your help in advance.
=C2-Larry=C2-
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