Today's Message Index:
----------------------
1. 02:51 AM - Re: Mag timing HS6A is the book wrong? (JL2A)
2. 03:02 AM - Re: Mag timing HS6A is the book wrong? (woodja51)
3. 03:28 AM - Re:Mag timing HS6A is the book wrong? (Craig Payne)
4. 03:36 AM - Re: I'm Looking to train on YAK52 (USA , Canada or Europe ) (jay-dub)
5. 09:46 AM - Re: Re:Mag timing HS6A is the book wrong? (Walter Lannon)
6. 11:24 AM - Re: Re: I'm Looking to train on YAK52 (USA , Canada or Europe ) (jones uzan)
Message 1
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| Subject: | Re: Mag timing HS6A is the book wrong? |
I think my esteemed colleague woodja has come up with the answer:
>
> advance on magneto is calculated as the angle the advance moves on the device
itself ,
>
> nothing to do with piston , prop or anything ...thus ,
>
> I read the magneto is geared at 1.125 internally. This from Tech specs ...
>
>
> So 27 degrees of magneto advance only equals 27/1.125 , or 24 degrees of piston
advance .
>
> 24 degrees from 31 +|-1 degree (from tech specs ..)
>
> is the TDC degrees piston firing point ,
>
> equals 7.0 degrees of piston advance required ,
>
> which , multiplied by .787 equals
>
>
>
>
> 5.5 degrees of prop advance.
>
> Remarkably close to the table ...
>
>
> ie exact.
>
>
> ..And +/-1 degree of piston is , funnily , +-.7 degree of prop , coincidentally
the limit variation...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470679#470679
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| Subject: | Re: Mag timing HS6A is the book wrong? |
I reckon this is the answer ...I already told Anatole, but for anyone wondering
How it's calculated here's some math. Also , something for those timing air start
distributors , there is a paperwork out there stating the hole aperture is
set at 1mm gap on the number 4 master / with prop at 9.5 ATDC. .
It should read 0.1 mm ... BIG DIFFERENCE?. FYI .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470680#470680
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Message 3
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| Subject: | Re:Mag timing HS6A is the book wrong? |
Huh?? Multiply not Divide the prop ratio? Must be the New Math they taught
a few years back when Johnny was being educated. After 40 years of dumb
down in the schools for Johnny. Johnny is a genius.
Rather than go into a long discourse about timing, My advice is to stick
with what you know works.
Now, what are the effects on running too far advanced? The Bad: Heat, CHT's
will be higher at climb power, Best Power will not be obtained. The Good:
an efficient burn at low manifold pressures where a lean burn slows flame
front progression. The Ugly: piston and exhaust valve erosion, evidenced by
white powdery deposits and burn spots.
M-14P Series II owners are lucky. They can buy one of my Gearcase windows
that allows them quickly and exactly determine where TDC is and calculate
where the magneto points (fire) open. HS6A owners must use a Timerite or
that prop. If using the Prop. make up a jig so that a digital level can be
used to measure prop angle.
Keep Johnny away from the calculator while you figure out where to set the
timing.
Craig Payne
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Message 4
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| Subject: | Re: I'm Looking to train on YAK52 (USA , Canada or Europe ) |
I can't help with an aircraft. Some countries will also have restrictions as to
hiring that type.
However, if you want instruction go to Gennady Elfimov of Skytrace. He's based
in the UK but will travel. The most experienced Yak52 instructor in the world.
--------
CJ and Yak-52 owner
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470682#470682
Message 5
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| Subject: | Re:Mag timing HS6A is the book wrong? |
Woodja51=99s math is quite correct.
The only problem is it needs some explanation of the factors involved to be
meaningful. If there is anyone really interested I would be happy to prov
ide that.
Craigs =9CGood, Bad and Ugly=9D is also right on. One descript
ion of =9CUgly=9D for the M14P is the installation of an auto
advance mag. being incorrectly timed to the values of the stock fixed spark
magneto.
Walt
From: Craig Payne
Sent: Tuesday, July 04, 2017 3:25 AM
Subject: Yak-List: Re:Mag timing HS6A is the book wrong?
Huh?? Multiply not Divide the prop ratio? Must be the New Math they taught
a few years back when Johnny was being educated. After 40 years of dumb dow
n in the schools for Johnny. Johnny is a genius.
Rather than go into a long discourse about timing, My advice is to stick wi
th what you know works.
Now, what are the effects on running too far advanced? The Bad: Heat, CHT's
will be higher at climb power, Best Power will not be obtained. The Good:
an efficient burn at low manifold pressures where a lean burn slows flame f
ront progression. The Ugly: piston and exhaust valve erosion, evidenced by
white powdery deposits and burn spots.
M-14P Series II owners are lucky. They can buy one of my Gearcase windows t
hat allows them quickly and exactly determine where TDC is and calculate wh
ere the magneto points (fire) open. HS6A owners must use a Timerite or that
prop. If using the Prop. make up a jig so that a digital level can be used
to measure prop angle.
Keep Johnny away from the calculator while you figure out where to set the
timing.
Craig Payne
Virus-free. www.avg.com
---
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Message 6
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| Subject: | Re: I'm Looking to train on YAK52 (USA , Canada or Europe |
)
Thank you ,
I have reached out to Gennady via his website, waiting reply.
If any one has Gannady direct email to share that would be great, thanks.
Sent from my iPhone
> On Jul 4, 2017, at 03:33, jay-dub <flyjnw@gmail.com> wrote:
>
>
> I can't help with an aircraft. Some countries will also have restrictions as
to hiring that type.
>
> However, if you want instruction go to Gennady Elfimov of Skytrace. He's based
in the UK but will travel. The most experienced Yak52 instructor in the world.
>
>
>
> --------
> CJ and Yak-52 owner
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470682#470682
>
>
>
>
>
>
>
>
>
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