Today's Message Index:
----------------------
1. 06:40 AM - Re: Twisted Yak 52 Airframe (Phillip Salter)
2. 07:50 AM - Re: Twisted Yak 52 Airframe (Mark Davis)
3. 08:54 AM - Re: Twisted Yak 52 Airframe (A. Dennis Savarese)
4. 11:04 AM - Re: Twisted Yak 52 Airframe (bill wade)
5. 05:05 PM - Re: Twisted Yak 52 Airframe (Roger Kemp)
6. 05:12 PM - Re: Twisted Yak 52 Airframe (Roger Kemp)
7. 05:50 PM - Re: Twisted Yak 52 Airframe (William Geipel)
Message 1
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| Subject: | Re: Twisted Yak 52 Airframe |
Mark,
You peaked my interest in twisted airframes. I have contacted a few Yak folks
and the common answer, spoke to how aircraft are set up during assembly, rather
than a twist. Of course anything is possible, but twisting a Yak airframe would
take serious abuse, and most likely over G. The Yaks only have 4 deg of dihedral
and are neutrally stable for aerobatic purposes so it does not take much
to change from stabile flight to a slight roll one way or the other. I talked
with Yak owner who is an aeronautical engineer and his suggestion for my plane
is to cover the lighting holes behind the right aileron first. This plane flew
mostly hands off when I got it but it changed. The fabric covering the lightning
holes came off which may be causing drag on the right wing from turbulence.
My aircraft was not an aerobatic club plane, it was Romanian Military which
I was told is a better or less aggressive service for the Yaks.
Do you by chance know what actually twists on the Yak airframe? Measurements may
be the answer to find a twist.
Regards,
Phil
-----Original Message-----
From: Mark Davis <markdavis@wbsnet.org>
Sent: Fri, Mar 24, 2017 7:11 pm
Subject: Re: Yak-List: Twisted Yak 52 Airframe
With 4 degrees of dihedral, bending one a little might help with stability! I
can tweak trim tabs and get close, but power changes due to fuel or passenger
weight will change it enough that a wing is always going to drop. The Soviets
must have stolen the stability characteristics of an A-4 and applied them at the
Yakovlev Design Bureau. They forgot to steal Mr Heinemann's electric trim
system design for the Scooter....
Fly Navy,
Mark Davis
Sent from my iPhone
> On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com> wrote:
>
>
> Many of the Yaks that came out of Russia after the fall had been twisted by the
aerobatics clubs. If you can get it to fly straight and level in cruise, let
me know.
>
> I received the above email concerning my Yak. I have been involved and owned
Yaks over 17 years, and never heard anyone mention a "twisted" Yak. Is there any
validity to this? Being an nearly 0 deg dihedral aircraft, is a Yak 52 ever
totally stable? My aircraft flies great but has a slight roll to the right,
so minor I never worry about it.
>
> Regards,
>
> Phil
>
> --------
> Phil
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467584#467584
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Twisted Yak 52 Airframe |
I don't know if you can twist a YAK52 airframe without running over it
with a Russian tractor, mine has more rivets on it than the USS
Missouri. I've been told two things about YAK 52 airframes, but I
can't verify their accuracy. One, there has never been an inflight
failure of a YAK 52 airframe. Two, that the Soviets/Russians design
their aircraft such that airframe failure shouldn't occur before twice
the G limit of the aircraft vs. 1.5 times the G limit for U.S. certified
aircraft. Therefore, even a +5/-3 airframe wouldn't fail before +10
g's, most will stall long before that or the pilot will be GLOC'd and
not know the difference. Early in their history the YAK Design Bureau
obviously saw an issue with the airframes and performed the modification
to raise the limits to +7/-5 g's. There are others who watch this list
who may chime in the specifics.
You may be onto something if one aileron has the fabric holes uncovered,
but any drag would more likely be fixed by tweaking the rudder trim tab
and putting the ball in the center. Any airflow disruption would more
likely cause a change in the effectiveness of aileron itself by
disturbing the boundary layer. But, that big chunk of wood on the front
of the YAK that the Russians call a V530 propeller creates so much P
factor that any change in power settings or RPM noticeably changes roll
trim on my YAK. So I try to trim mine for a typical 70% rpm 125-130
KTAS cruising speed for cross country flights and live with the slightly
out of trim one way or the other aileron control pressures the rest of
the time. Otherwise, seek out a cheap electric trim system or do what I
do and make my wife take the stick for a few minutes if I'm trying to
refold a sectional on a cross country. I may be the last dinosaur out
there without ForeFlight that still keeps a paper sectional in the
airplane....and everywhere I go I have to either flip the chart or
refold as I go from seam to seam.... : )
Mark Davis
N44YK
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Phillip Salter
Sent: Saturday, March 25, 2017 7:36 AM
Subject: Re: Yak-List: Twisted Yak 52 Airframe
Mark,
You peaked my interest in twisted airframes. I have contacted a few Yak
folks and the common answer, spoke to how aircraft are set up during
assembly, rather than a twist. Of course anything is possible, but
twisting a Yak airframe would take serious abuse, and most likely over
G. The Yaks only have 4 deg of dihedral and are neutrally stable for
aerobatic purposes so it does not take much to change from stabile
flight to a slight roll one way or the other. I talked with Yak owner
who is an aeronautical engineer and his suggestion for my plane is to
cover the lighting holes behind the right aileron first. This plane flew
mostly hands off when I got it but it changed. The fabric covering the
lightning holes came off which may be causing drag on the right wing
from turbulence. My aircraft was not an aerobatic club plane, it was
Romanian Military which I was told is a better or less aggressive
service for the Yaks.
Do you by chance know what actually twists on the Yak airframe?
Measurements may be the answer to find a twist.
Regards,
Phil
-----Original Message-----
From: Mark Davis <markdavis@wbsnet.org>
Sent: Fri, Mar 24, 2017 7:11 pm
Subject: Re: Yak-List: Twisted Yak 52 Airframe
With 4 degrees of dihedral, bending one a little might help with
stability! I can tweak trim tabs and get close, but power changes due to
fuel or passenger weight will change it enough that a wing is always
going to drop. The Soviets must have stolen the stability
characteristics of an A-4 and applied them at the Yakovlev Design
Bureau. They forgot to steal Mr Heinemann's electric trim system design
for the Scooter....
Fly Navy,
Mark Davis
Sent from my iPhone
> On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com> wrote:
>
>
> Many of the Yaks that came out of Russia after the fall had been
twisted by the aerobatics clubs. If you can get it to fly straight and
level in cruise, let me know.
>
> I received the above email concerning my Yak. I have been involved and
owned Yaks over 17 years, and never heard anyone mention a "twisted"
Yak. Is there any validity to this? Being an nearly 0 deg dihedral
aircraft, is a Yak 52 ever totally stable? My aircraft flies great but
has a slight roll to the right, so minor I never worry about it.
>
> Regards,
>
> Phil
>
> --------
> Phil
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467584#467584
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Twisted Yak 52 Airframe |
The Yak 52's wing has 2 degrees dihedral on the bottom of the wing (with
2 wings, I guess that would equal 4 degree :-))
The first Yak 52's had the +7,-5 rating and were later derated by the
YDB until SB's 59 and 60 were installed.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/25/2017 10:47 AM, Mark Davis wrote:
>
> I don't know if you can twist a YAK52 airframe without running over it
> with a Russian tractor, mine has more rivets on it than the USS
> Missouri. I've been told two things about YAK 52 airframes, but I
> can't verify their accuracy. One, there has never been an inflight
> failure of a YAK 52 airframe. Two, that the Soviets/Russians design
> their aircraft such that airframe failure shouldn't occur before twice
> the G limit of the aircraft vs. 1.5 times the G limit for U.S.
> certified aircraft. Therefore, even a +5/-3 airframe wouldn't fail
> before +10 g's, most will stall long before that or the pilot will be
> GLOC'd and not know the difference. Early in their history the YAK
> Design Bureau obviously saw an issue with the airframes and performed
> the modification to raise the limits to +7/-5 g's. There are others
> who watch this list who may chime in the specifics.
>
> You may be onto something if one aileron has the fabric holes
> uncovered, but any drag would more likely be fixed by tweaking the
> rudder trim tab and putting the ball in the center. Any airflow
> disruption would more likely cause a change in the effectiveness of
> aileron itself by disturbing the boundary layer. But, that big chunk
> of wood on the front of the YAK that the Russians call a V530
> propeller creates so much P factor that any change in power settings
> or RPM noticeably changes roll trim on my YAK. So I try to trim mine
> for a typical 70% rpm 125-130 KTAS cruising speed for cross country
> flights and live with the slightly out of trim one way or the other
> aileron control pressures the rest of the time. Otherwise, seek out a
> cheap electric trim system or do what I do and make my wife take the
> stick for a few minutes if I'm trying to refold a sectional on a cross
> country. I may be the last dinosaur out there without ForeFlight that
> still keeps a paper sectional in the airplane....and everywhere I go I
> have to either flip the chart or refold as I go from seam to seam.... : )
>
> Mark Davis
>
> N44YK
>
> *From:*owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] *On Behalf Of *Phillip Salter
> *Sent:* Saturday, March 25, 2017 7:36 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Twisted Yak 52 Airframe
>
> Mark,
>
> You peaked my interest in twisted airframes. I have contacted a few
> Yak folks and the common answer, spoke to how aircraft are set up
> during assembly, rather than a twist. Of course anything is possible,
> but twisting a Yak airframe would take serious abuse, and most likely
> over G. The Yaks only have 4 deg of dihedral and are neutrally stable
> for aerobatic purposes so it does not take much to change from stabile
> flight to a slight roll one way or the other. I talked with Yak owner
> who is an aeronautical engineer and his suggestion for my plane is to
> cover the lighting holes behind the right aileron first. This plane
> flew mostly hands off when I got it but it changed. The fabric
> covering the lightning holes came off which may be causing drag on the
> right wing from turbulence. My aircraft was not an aerobatic club
> plane, it was Romanian Military which I was told is a better or less
> aggressive service for the Yaks.
>
> Do you by chance know what actually twists on the Yak airframe?
> Measurements may be the answer to find a twist.
>
> Regards,
>
> Phil
>
> -----Original Message-----
> From: Mark Davis <markdavis@wbsnet.org <mailto:markdavis@wbsnet.org>>
> To: yak-list <yak-list@matronics.com <mailto:yak-list@matronics.com>>
> Sent: Fri, Mar 24, 2017 7:11 pm
> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>
> <mailto:markdavis@wbsnet.org>>
>
> With 4 degrees of dihedral, bending one a little might help with
> stability! I can tweak trim tabs and get close, but power changes due
> to fuel or passenger weight will change it enough that a wing is
> always going to drop. The Soviets must have stolen the stability
> characteristics of an A-4 and applied them at the Yakovlev Design
> Bureau. They forgot to steal Mr Heinemann's electric trim system
> design for the Scooter....
>
> Fly Navy,
> Mark Davis
>
> Sent from my iPhone
>
> > On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com
> <mailto:psalter@aol.com>> wrote:
> >
> <mailto:psalter@aol.com>>
> >
> > Many of the Yaks that came out of Russia after the fall had been
> twisted by the aerobatics clubs. If you can get it to fly straight and
> level in cruise, let me know.
> >
> > I received the above email concerning my Yak. I have been involved
> and owned Yaks over 17 years, and never heard anyone mention a
> "twisted" Yak. Is there any validity to this? Being an nearly 0 deg
> dihedral aircraft, is a Yak 52 ever totally stable? My aircraft flies
> great but has a slight roll to the right, so minor I never worry about
> it.
> >
> > Regards,
> >
> > Phil
> >
> > --------
> > Phil
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=467584#467584
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
Message 4
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| Subject: | Re: Twisted Yak 52 Airframe |
One more thing that no one has mentioned is the centering springs on the st
ick I think you could adjust them so the aircraft would fly straight and le
vel, I took mine out because when I fly the Yak straight and level is the f
urthest thing on my mind.Bill Wade N4450Y
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
To: yak-list@matronics.com
Sent: Saturday, March 25, 2017 12:05 PM
Subject: Re: Yak-List: Twisted Yak 52 Airframe
th.net>
The Yak 52's wing has 2 degrees dihedral on the bottom of the wing (with
2 wings, I guess that would equal 4 degree :-))
The first Yak 52's had the +7,-5 rating and were later derated by the
YDB until SB's 59 and 60 were installed.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/25/2017 10:47 AM, Mark Davis wrote:
>
> I don't know if you can twist a YAK52 airframe without running over it
> with a Russian tractor, mine has more rivets on it than the USS
> Missouri.=C2- I've been told two things about YAK 52 airframes, but I
> can't verify their accuracy.=C2- One, there has never been an inflight
> failure of a YAK 52 airframe. Two, that the Soviets/Russians design
> their aircraft such that airframe failure shouldn't occur before twice
> the G limit of the aircraft vs. 1.5 times the G limit for U.S.
> certified aircraft.=C2- Therefore, even a +5/-3 airframe wouldn't fail
> before +10 g's, most will stall long before that or the pilot will be
> GLOC'd and not know the difference.=C2- Early in their history the YAK
> Design Bureau obviously saw an issue with the airframes and performed
> the modification to raise the limits to +7/-5 g's.=C2- There are others
> who watch this list who may chime in the specifics.
>
> You may be onto something if one aileron has the fabric holes
> uncovered, but any drag would more likely be fixed by tweaking the
> rudder trim tab and putting the ball in the center.=C2- Any airflow
> disruption would more likely cause a change in the effectiveness of
> aileron itself by disturbing the boundary layer.=C2- But, that big chun
k
> of wood on the front of the YAK that the Russians call a V530
> propeller creates so much P factor that any change in power settings
> or RPM noticeably changes roll trim on my YAK.=C2- So I try to trim min
e
> for a typical 70% rpm 125-130 KTAS cruising speed for cross country
> flights and live with the slightly out of trim one way or the other
> aileron control pressures the rest of the time.=C2- Otherwise, seek out
a
> cheap electric trim system or do what I do and make my wife take the
> stick for a few minutes if I'm trying to refold a sectional on a cross
> country.=C2- I may be the last dinosaur out there without ForeFlight th
at
> still keeps a paper sectional in the airplane....and everywhere I go I
> have to either flip the chart or refold as I go from seam to seam....=C2
- : )
>
> Mark Davis
>
> N44YK
>
> *From:*owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] *On Behalf Of *Phillip Salte
r
> *Sent:* Saturday, March 25, 2017 7:36 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Twisted Yak 52 Airframe
>
> Mark,
>
> You peaked my interest in twisted airframes.=C2- I have contacted a few
> Yak folks and the common answer, spoke to how aircraft are set up
> during assembly, rather than a twist. Of course anything is possible,
> but twisting a Yak airframe would take serious abuse, and most likely
> over G. The Yaks only have 4 deg of dihedral and are neutrally stable
> for aerobatic purposes so it does not take much to change from stabile
> flight to a slight roll one way or the other. I talked with Yak owner
> who is an aeronautical engineer and his suggestion for my plane is to
> cover the lighting holes behind the right aileron first. This plane
> flew mostly hands off when I got it but it changed. The fabric
> covering the lightning holes came off which may be causing drag on the
> right wing from turbulence.=C2- My aircraft was not an aerobatic club
> plane, it was Romanian Military which=C2- I was told is a better or les
s
> aggressive service for the Yaks.
>
> Do you by chance know what actually twists on the Yak airframe?
>=C2- Measurements may be the answer to find a twist.
>
> Regards,
>
> Phil
>
> -----Original Message-----
> From: Mark Davis <markdavis@wbsnet.org <mailto:markdavis@wbsnet.org>>
> To: yak-list <yak-list@matronics.com <mailto:yak-list@matronics.com>>
> Sent: Fri, Mar 24, 2017 7:11 pm
> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>
> <mailto:markdavis@wbsnet.org>>
>
> With 4 degrees of dihedral, bending one a little might help with
> stability! I can tweak trim tabs and get close, but power changes due
> to fuel or passenger weight will change it enough that a wing is
> always going to drop. The Soviets must have stolen the stability
> characteristics of an A-4 and applied them at the Yakovlev Design
> Bureau. They forgot to steal Mr Heinemann's electric trim system
> design for the Scooter....
>
> Fly Navy,
> Mark Davis
>
> Sent from my iPhone
>
> > On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com
> <mailto:psalter@aol.com>> wrote:
> >
> <mailto:psalter@aol.com>>
> >
> > Many of the Yaks that came out of Russia after the fall had been
> twisted by the aerobatics clubs. If you can get it to fly straight and
> level in cruise, let me know.
> >
> > I received the above email concerning my Yak. I have been involved
> and owned Yaks over 17 years, and never heard anyone mention a
> "twisted" Yak. Is there any validity to this? Being an nearly 0 deg
> dihedral aircraft, is a Yak 52 ever totally stable? My aircraft flies
> great but has a slight roll to the right, so minor I never worry about
> it.
> >
> > Regards,
> >
> > Phil
> >
> > --------
> > Phil
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=467584#467584
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 5
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| Subject: | Re: Twisted Yak 52 Airframe |
Phil,
It's the driver not the YAK that is twisted.
Seriously, no I have not been told my YAK was twisted.
Doc
Sent from my iPad
> On Mar 24, 2017, at 6:29 PM, PS <psalter@aol.com> wrote:
>
>
> Many of the Yaks that came out of Russia after the fall had been twisted by the
aerobatics clubs. If you can get it to fly straight and level in cruise, let
me know.
>
> I received the above email concerning my Yak. I have been involved and owned
Yaks over 17 years, and never heard anyone mention a "twisted" Yak. Is there any
validity to this? Being an nearly 0 deg dihedral aircraft, is a Yak 52 ever
totally stable? My aircraft flies great but has a slight roll to the right,
so minor I never worry about it.
>
> Regards,
>
> Phil
>
> --------
> Phil
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467584#467584
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: Twisted Yak 52 Airframe |
Paddles,
You are doing better than me on paper charts. With the canopy cracked I can'
t keep them in the cockpit.
Doc
Sent from my iPad
> On Mar 25, 2017, at 9:47 AM, Mark Davis <markdavis@wbsnet.org> wrote:
>
> I don't know if you can twist a YAK52 airframe without running over it wit
h a Russian tractor, mine has more rivets on it than the USS Missouri. I'v
e been told two things about YAK 52 airframes, but I can't verify their accu
racy. One, there has never been an inflight failure of a YAK 52 airframe. T
wo, that the Soviets/Russians design their aircraft such that airframe failu
re shouldn't occur before twice the G limit of the aircraft vs. 1.5 times th
e G limit for U.S. certified aircraft. Therefore, even a +5/-3 airframe wou
ldn't fail before +10 g's, most will stall long before that or the pilot wil
l be GLOC'd and not know the difference. Early in their history the YAK Des
ign Bureau obviously saw an issue with the airframes and performed the modif
ication to raise the limits to +7/-5 g's. There are others who watch this l
ist who may chime in the specifics.
>
> You may be onto something if one aileron has the fabric holes uncovered, b
ut any drag would more likely be fixed by tweaking the rudder trim tab and p
utting the ball in the center. Any airflow disruption would more likely cau
se a change in the effectiveness of aileron itself by disturbing the boundar
y layer. But, that big chunk of wood on the front of the YAK that the Russi
ans call a V530 propeller creates so much P factor that any change in power s
ettings or RPM noticeably changes roll trim on my YAK. So I try to trim min
e for a typical 70% rpm 125-130 KTAS cruising speed for cross country flight
s and live with the slightly out of trim one way or the other aileron contro
l pressures the rest of the time. Otherwise, seek out a cheap electric trim
system or do what I do and make my wife take the stick for a few minutes if
I'm trying to refold a sectional on a cross country. I may be the last din
osaur out there without ForeFlight that still keeps a paper sectional in the
airplane....and everywhere I go I have to either flip the chart or refold a
s I go from seam to seam.... : )
>
> Mark Davis
> N44YK
>
>
> From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@ma
tronics.com] On Behalf Of Phillip Salter
> Sent: Saturday, March 25, 2017 7:36 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>
> Mark,
>
> You peaked my interest in twisted airframes. I have contacted a few Yak f
olks and the common answer, spoke to how aircraft are set up during assembly
, rather than a twist. Of course anything is possible, but twisting a Yak ai
rframe would take serious abuse, and most likely over G. The Yaks only have 4
deg of dihedral and are neutrally stable for aerobatic purposes so it does n
ot take much to change from stabile flight to a slight roll one way or the o
ther. I talked with Yak owner who is an aeronautical engineer and his sugges
tion for my plane is to cover the lighting holes behind the right aileron fi
rst. This plane flew mostly hands off when I got it but it changed. The fabr
ic covering the lightning holes came off which may be causing drag on the ri
ght wing from turbulence. My aircraft was not an aerobatic club plane, it w
as Romanian Military which I was told is a better or less aggressive servic
e for the Yaks.
>
> Do you by chance know what actually twists on the Yak airframe? Measureme
nts may be the answer to find a twist.
>
> Regards,
>
> Phil
>
>
> -----Original Message-----
> From: Mark Davis <markdavis@wbsnet.org>
> To: yak-list <yak-list@matronics.com>
> Sent: Fri, Mar 24, 2017 7:11 pm
> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>
>
> With 4 degrees of dihedral, bending one a little might help with stability
! I can tweak trim tabs and get close, but power changes due to fuel or pass
enger weight will change it enough that a wing is always going to drop. The S
oviets must have stolen the stability characteristics of an A-4 and applied t
hem at the Yakovlev Design Bureau. They forgot to steal Mr Heinemann's elect
ric trim system design for the Scooter....
>
> Fly Navy,
> Mark Davis
>
> Sent from my iPhone
>
> > On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com> wrote:
> >
> >
> > Many of the Yaks that came out of Russia after the fall had been twisted
by the aerobatics clubs. If you can get it to fly straight and level in cru
ise, let me know.
> >
> > I received the above email concerning my Yak. I have been involved and o
wned Yaks over 17 years, and never heard anyone mention a "twisted" Yak. Is t
here any validity to this? Being an nearly 0 deg dihedral aircraft, is a Yak
52 ever totally stable? My aircraft flies great but has a slight roll to th
e right, so minor I never worry about it.
> >
> > Regards,
> >
> > Phil
> >
> > --------
> > Phil
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=467584#467584
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
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| Subject: | Re: Twisted Yak 52 Airframe |
Pull 10g in the other direction. It will probably twist back. All good.
Tape the charts to the windshield; keeps the sun out and they don=99
t blow away as often. Slide the chart into the crack.
OR buy a CJ. They have so many issues that you won=99t notice that
you=99re twisted and flying sideways.
Just a thought.
> On Mar 25, 2017, at 18:09, Roger Kemp <f16viperdoc@me.com> wrote:
>
> Paddles,
> You are doing better than me on paper charts. With the canopy cracked
I can't keep them in the cockpit.
> Doc
>
> Sent from my iPad
>
> On Mar 25, 2017, at 9:47 AM, Mark Davis <markdavis@wbsnet.org
<mailto:markdavis@wbsnet.org>> wrote:
>
>> I don't know if you can twist a YAK52 airframe without running over
it with a Russian tractor, mine has more rivets on it than the USS
Missouri. I've been told two things about YAK 52 airframes, but I
can't verify their accuracy. One, there has never been an inflight
failure of a YAK 52 airframe. Two, that the Soviets/Russians design
their aircraft such that airframe failure shouldn't occur before twice
the G limit of the aircraft vs. 1.5 times the G limit for U.S. certified
aircraft. Therefore, even a +5/-3 airframe wouldn't fail before +10
g's, most will stall long before that or the pilot will be GLOC'd and
not know the difference. Early in their history the YAK Design Bureau
obviously saw an issue with the airframes and performed the modification
to raise the limits to +7/-5 g's. There are others who watch this list
who may chime in the specifics.
>>
>> You may be onto something if one aileron has the fabric holes
uncovered, but any drag would more likely be fixed by tweaking the
rudder trim tab and putting the ball in the center. Any airflow
disruption would more likely cause a change in the effectiveness of
aileron itself by disturbing the boundary layer. But, that big chunk of
wood on the front of the YAK that the Russians call a V530 propeller
creates so much P factor that any change in power settings or RPM
noticeably changes roll trim on my YAK. So I try to trim mine for a
typical 70% rpm 125-130 KTAS cruising speed for cross country flights
and live with the slightly out of trim one way or the other aileron
control pressures the rest of the time. Otherwise, seek out a cheap
electric trim system or do what I do and make my wife take the stick for
a few minutes if I'm trying to refold a sectional on a cross country. I
may be the last dinosaur out there without ForeFlight that still keeps a
paper sectional in the airplane....and everywhere I go I have to either
flip the chart or refold as I go from seam to seam.... : )
>>
>> Mark Davis
>> N44YK
>>
>>
>> From: owner-yak-list-server@matronics.com
<mailto:owner-yak-list-server@matronics.com>
[mailto:owner-yak-list-server@matronics.com
<mailto:owner-yak-list-server@matronics.com>] On Behalf Of Phillip
Salter
>> Sent: Saturday, March 25, 2017 7:36 AM
>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>>
>> Mark,
>>
>> You peaked my interest in twisted airframes. I have contacted a few
Yak folks and the common answer, spoke to how aircraft are set up during
assembly, rather than a twist. Of course anything is possible, but
twisting a Yak airframe would take serious abuse, and most likely over
G. The Yaks only have 4 deg of dihedral and are neutrally stable for
aerobatic purposes so it does not take much to change from stabile
flight to a slight roll one way or the other. I talked with Yak owner
who is an aeronautical engineer and his suggestion for my plane is to
cover the lighting holes behind the right aileron first. This plane flew
mostly hands off when I got it but it changed. The fabric covering the
lightning holes came off which may be causing drag on the right wing
from turbulence. My aircraft was not an aerobatic club plane, it was
Romanian Military which I was told is a better or less aggressive
service for the Yaks.
>>
>> Do you by chance know what actually twists on the Yak airframe?
Measurements may be the answer to find a twist.
>>
>> Regards,
>>
>> Phil
>>
>>
>> -----Original Message-----
>> From: Mark Davis <markdavis@wbsnet.org <mailto:markdavis@wbsnet.org>>
>> To: yak-list <yak-list@matronics.com <mailto:yak-list@matronics.com>>
>> Sent: Fri, Mar 24, 2017 7:11 pm
>> Subject: Re: Yak-List: Twisted Yak 52 Airframe
>>
<mailto:markdavis@wbsnet.org>>
>>
>> With 4 degrees of dihedral, bending one a little might help with
stability! I can tweak trim tabs and get close, but power changes due to
fuel or passenger weight will change it enough that a wing is always
going to drop. The Soviets must have stolen the stability
characteristics of an A-4 and applied them at the Yakovlev Design
Bureau. They forgot to steal Mr Heinemann's electric trim system design
for the Scooter....
>>
>> Fly Navy,
>> Mark Davis
>>
>> Sent from my iPhone
>>
>> > On Mar 24, 2017, at 5:29 PM, PS <psalter@aol.com
<mailto:psalter@aol.com>> wrote:
>> >
<mailto:psalter@aol.com>>
>> >
>> > Many of the Yaks that came out of Russia after the fall had been
twisted by the aerobatics clubs. If you can get it to fly straight and
level in cruise, let me know.
>> >
>> > I received the above email concerning my Yak. I have been involved
and owned Yaks over 17 years, and never heard anyone mention a "twisted"
Yak. Is there any validity to this? Being an nearly 0 deg dihedral
aircraft, is a Yak 52 ever totally stable? My aircraft flies great but
has a slight roll to the right, so minor I never worry about it.
>> >
>> > Regards,
>> >
>> > Phil
>> >
>> > --------
>> > Phil
>> >
>> >
>> >
>> >
>> > Read this topic online here:
>> >
>> > http://forums.matronics.com/viewtopic.php?p=467584#467584
<http://forums.matronics.com/viewtopic.php?p=467584#467584>
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
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