Today's Message Index:
----------------------
1. 08:03 AM - Prop Balancing (Ernest Martinez)
2. 08:15 AM - Re: Prop Balancing (Ernest Martinez)
3. 10:33 AM - Re: Prop Balancing (Walter Lannon)
4. 10:42 AM - Re: Prop Balancing (Ernest Martinez)
5. 11:29 AM - Re: Prop Balancing (Walter Lannon)
6. 11:39 AM - Re: Prop Balancing (Ernest Martinez)
7. 04:32 PM - Twisted Yak 52 Airframe (PS)
8. 05:11 PM - Re: Twisted Yak 52 Airframe (Mark Davis)
Message 1
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Does anyone have any detail on balancing the Housai Prop? Let me start off
saying that I have the most rudimentary understanding of how a prop is
balanced. It seems that the position on the hub perpendicular to the
rotation axis is pretty arbitrary. Does anyone have a written procedure of
any sort?
Ernie
Message 2
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| Subject: | Re: Prop Balancing |
Just read my own email, and it's pretty cryptic. I'm referring to where the
weights get placed. I'm unsure about how one would determine where around
the circumference of the blade shaft one would place the weight. When one
balances a wheel theres only one dimension you're dealing with, here there
are two.
Ernie
On Fri, Mar 24, 2017 at 11:00 AM, Ernest Martinez <erniel29@gmail.com>
wrote:
> Does anyone have any detail on balancing the Housai Prop? Let me start off
> saying that I have the most rudimentary understanding of how a prop is
> balanced. It seems that the position on the hub perpendicular to the
> rotation axis is pretty arbitrary. Does anyone have a written procedure of
> any sort?
>
> Ernie
>
Message 3
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| Subject: | Re: Prop Balancing |
Ernie;
Static propellor balancing is done with a central arbor installed on a prec
ision leveled set of balance ways. Level tolerance is within 0.0005
=9D pet foot of length.
Quick summary for J9-G1 prop.-- With blades level add corrective weight t
o balance ring in any circumferential location. Position blades vertical,
move installed weight circumferentially to correct vertical unbalance.
If, in best location, vertical unbalance still not corrected add additional
weight in same circumferential location to BOTH blades.
With both horizontal and vertical unbalance corrected the prop. will balanc
e in all positions.
Walt
From: Ernest Martinez
Sent: Friday, March 24, 2017 8:13 AM
Subject: Re: Yak-List: Prop Balancing
Just read my own email, and it's pretty cryptic. I'm referring to where the
weights get placed. I'm unsure about how one would determine where around
the circumference of the blade shaft one would place the weight. When one b
alances a wheel theres only one dimension you're dealing with, here there a
re two.
Ernie
On Fri, Mar 24, 2017 at 11:00 AM, Ernest Martinez <erniel29@gmail.com> wrot
e:
Does anyone have any detail on balancing the Housai Prop? Let me start of
f saying that I have the most rudimentary understanding of how a prop is ba
lanced. It seems that the position on the hub perpendicular to the rotation
axis is pretty arbitrary. Does anyone have a written procedure of any sort
?
Ernie
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Message 4
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| Subject: | Re: Prop Balancing |
Walt,
I was referring to Dynamic balancing. But I never considered static balance
in both planes.
Thanks.
Ernie
On Fri, Mar 24, 2017 at 1:37 PM Walter Lannon <wlannon@shaw.ca> wrote:
> Ernie;
>
> Static propellor balancing is done with a central arbor installed on a
> precision leveled set of balance ways. Level tolerance is within 0.0005
=9D
> pet foot of length.
> Quick summary for J9-G1 prop.-- With blades level add corrective weight
> to balance ring in any circumferential location. Position blades
> vertical, move installed weight circumferentially to correct vertical
> unbalance. If, in best location, vertical unbalance still not corrected
> add additional weight in same circumferential location to BOTH blades.
> With both horizontal and vertical unbalance corrected the prop. will
> balance in all positions.
>
> Walt
>
>
> *From:* Ernest Martinez <erniel29@gmail.com>
> *Sent:* Friday, March 24, 2017 8:13 AM
> *To:* yak-list <yak-list@matronics.com>
> *Subject:* Re: Yak-List: Prop Balancing
>
> Just read my own email, and it's pretty cryptic. I'm referring to where
> the weights get placed. I'm unsure about how one would determine where
> around the circumference of the blade shaft one would place the weight.
> When one balances a wheel theres only one dimension you're dealing with,
> here there are two.
>
> Ernie
> On Fri, Mar 24, 2017 at 11:00 AM, Ernest Martinez <erniel29@gmail.com>
> wrote:
>
> Does anyone have any detail on balancing the Housai Prop? Let me start of
f
> saying that I have the most rudimentary understanding of how a prop is
> balanced. It seems that the position on the hub perpendicular to the
> rotation axis is pretty arbitrary. Does anyone have a written procedure o
f
> any sort?
>
> Ernie
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm
_campaign=sig-email&utm_content=emailclient> Virus-free.
> www.avast.com
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_campaign=sig-email&utm_content=emailclient>
>
Message 5
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| Subject: | Re: Prop Balancing |
Ernie;
Should always be static balanced first.
Dynamic balancing is also a very good idea which can correct the aerodynam
ic effects of discrepancies between blades with regard to spanwise angle di
stribution, width, thickness and profile. For al. alloy blades if all of
these factors are carefully addressed at overhaul the need for dynamic bala
ncing is greatly reduced and for installations like the CJ there is no spin
ner back-plate to satisfy the 360 deg. facility for correction.
Walt
From: Ernest Martinez
Sent: Friday, March 24, 2017 10:39 AM
Subject: Re: Yak-List: Prop Balancing
Walt,
I was referring to Dynamic balancing. But I never considered static balance
in both planes.
Thanks.
Ernie
On Fri, Mar 24, 2017 at 1:37 PM Walter Lannon <wlannon@shaw.ca> wrote:
Ernie;
Static propellor balancing is done with a central arbor installed on a pr
ecision leveled set of balance ways. Level tolerance is within 0.0005
=9D pet foot of length.
Quick summary for J9-G1 prop.-- With blades level add corrective weight
to balance ring in any circumferential location. Position blades vertica
l, move installed weight circumferentially to correct vertical unbalance.
If, in best location, vertical unbalance still not corrected add addition
al weight in same circumferential location to BOTH blades.
With both horizontal and vertical unbalance corrected the prop. will bala
nce in all positions.
Walt
From: Ernest Martinez
Sent: Friday, March 24, 2017 8:13 AM
To: yak-list
Subject: Re: Yak-List: Prop Balancing
Just read my own email, and it's pretty cryptic. I'm referring to where t
he weights get placed. I'm unsure about how one would determine where aroun
d the circumference of the blade shaft one would place the weight. When one
balances a wheel theres only one dimension you're dealing with, here there
are two.
Ernie
On Fri, Mar 24, 2017 at 11:00 AM, Ernest Martinez <erniel29@gmail.com> wr
ote:
Does anyone have any detail on balancing the Housai Prop? Let me start
off saying that I have the most rudimentary understanding of how a prop is
balanced. It seems that the position on the hub perpendicular to the rotati
on axis is pretty arbitrary. Does anyone have a written procedure of any so
rt?
Ernie
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Message 6
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| Subject: | Re: Prop Balancing |
Thanks Walt,
I'll have to find someone local who can static balance my prop.
Ernie
On Fri, Mar 24, 2017 at 2:26 PM, Walter Lannon <wlannon@shaw.ca> wrote:
> Ernie;
>
> Should always be static balanced first.
> Dynamic balancing is also a very good idea which can correct the
> aerodynamic effects of discrepancies between blades with regard to spanwi
se
> angle distribution, width, thickness and profile. For al. alloy blades
if
> all of these factors are carefully addressed at overhaul the need for
> dynamic balancing is greatly reduced and for installations like the CJ
> there is no spinner back-plate to satisfy the 360 deg. facility for
> correction.
>
> Walt
>
> *From:* Ernest Martinez <erniel29@gmail.com>
> *Sent:* Friday, March 24, 2017 10:39 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Prop Balancing
>
> Walt,
>
> I was referring to Dynamic balancing. But I never considered static
> balance in both planes.
>
> Thanks.
>
> Ernie
> On Fri, Mar 24, 2017 at 1:37 PM Walter Lannon <wlannon@shaw.ca> wrote:
>
>> Ernie;
>>
>> Static propellor balancing is done with a central arbor installed on a
>> precision leveled set of balance ways. Level tolerance is within 0.0005
=9D
>> pet foot of length.
>> Quick summary for J9-G1 prop.-- With blades level add corrective weigh
t
>> to balance ring in any circumferential location. Position blades
>> vertical, move installed weight circumferentially to correct vertical
>> unbalance. If, in best location, vertical unbalance still not correcte
d
>> add additional weight in same circumferential location to BOTH blades.
>> With both horizontal and vertical unbalance corrected the prop. will
>> balance in all positions.
>>
>> Walt
>>
>>
>>
>>
>> *From:* Ernest Martinez <erniel29@gmail.com>
>> *Sent:* Friday, March 24, 2017 8:13 AM
>> *To:* yak-list <yak-list@matronics.com>
>> *Subject:* Re: Yak-List: Prop Balancing
>>
>> Just read my own email, and it's pretty cryptic. I'm referring to where
>> the weights get placed. I'm unsure about how one would determine where
>> around the circumference of the blade shaft one would place the weight.
>> When one balances a wheel theres only one dimension you're dealing with,
>> here there are two.
>>
>> Ernie
>> On Fri, Mar 24, 2017 at 11:00 AM, Ernest Martinez <erniel29@gmail.com>
>> wrote:
>>
>> Does anyone have any detail on balancing the Housai Prop? Let me start
>> off saying that I have the most rudimentary understanding of how a prop
is
>> balanced. It seems that the position on the hub perpendicular to the
>> rotation axis is pretty arbitrary. Does anyone have a written procedure
of
>> any sort?
>>
>> Ernie
>>
>>
>>
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&ut
m_campaign=sig-email&utm_content=emailclient> Virus-free.
>> www.avast.com
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&ut
m_campaign=sig-email&utm_content=emailclient>
>>
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm
_campaign=sig-email&utm_content=emailclient> Virus-free.
> www.avast.com
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_campaign=sig-email&utm_content=emailclient>
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Message 7
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| Subject: | Twisted Yak 52 Airframe |
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 8
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| Subject: | Re: 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
>
>
>
>
>
>
>
>
>
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