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how does the starting coil work exactly

 
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jan.mevis(at)informavia.b
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PostPosted: Sun Dec 17, 2006 2:05 am    Post subject: how does the starting coil work exactly Reply with quote
Hi all,

This has been intriguing to me, so I try to figure out what happens exactly. Is the following reasoning correct, or am I missing it completely?

When pushing the start-button, the magnetos are still off. The high-tension starting coil gets current from the battery to its primary winding, and the changing flux causes a high voltage on the secondary winding. The left-hand magneto (front plugs) has a special connection for this coil, and this high tension is immediately conducted to the proper spark plug via the distributor on the left hand magneto.

If I understand this well, you get only one spark from the start coil, and you have to switch on the magneto’s immediately after hearing one “explosion”?
I always thought that there was a sort of “shower of sparks” generator ?

Is this system different on the Yak 50 and 52, or even compared with the CJ’s ?

Jan Mevis
Yak50 RA2005K

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wlannon(at)cablerocket.co
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PostPosted: Sun Dec 17, 2006 10:52 am    Post subject: how does the starting coil work exactly Reply with quote
Jan;

Your operational description of the boost coil is right on.

The spark is continuous (to the distributor starting finger) as long as the button is depressed and the engine would continue to run on the left mag only. Switching to both mags immediately keeps boost coil operation time to a minimum and avoids fouling of the right hand spark plugs.

Walt
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dsavarese(at)elmore.rr.co
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PostPosted: Mon Dec 18, 2006 4:44 am    Post subject: how does the starting coil work exactly Reply with quote
The starting coil is exactly the same for the 50, 52 and the CJ6. Parts are interchangeable. The spark is continuous as long as the start button is depressed.
Dennis

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jan.mevis(at)informavia.b
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PostPosted: Mon Dec 18, 2006 6:09 am    Post subject: how does the starting coil work exactly Reply with quote
Then what makes the current in the primary winding fluctuate? If the current is DC constant, there’s no flux change, and no high tension on the secondary. I suppose that there has to be some kind of mechanically fast interrupting device in the circuit of the primary winding of the booster coil ?

Jan


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese
Sent: maandag 18 december 2006 13:44
To: yak-list(at)matronics.com
Subject: Re: how does the starting coil work exactly


The starting coil is exactly the same for the 50, 52 and the CJ6. Parts are interchangeable. The spark is continuous as long as the start button is depressed.

Dennis


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scott-p(at)texas.net
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PostPosted: Mon Dec 18, 2006 7:46 am    Post subject: how does the starting coil work exactly Reply with quote
Hi All,

While we’re on the topic of the vibrator/starter coil, does anyone have any idea of the resistance load for the primary side of the coil and for the microswitch on the start valve? I have a Yak 55M which I am trying to convert to a solenoid start valve (the 55’s use a start valve with a microswitch mounted on the instrument panel, like the Sukhoi’s use; which of course means that air needs to get routed from the tank on the firewall, back through the cockpit and ultimately back through the firewall to the distributor. More distance & stuff means more fittings. More fittings = more places to leak…), and need to figure out the best way to wire the microswitch and the solenoid switch into the system.

Thanks,

Scott Poehlmann
Yak 55M N155YK


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jan Mevis
Sent: Monday, 18 December, 2006 07:07
To: yak-list(at)matronics.com
Subject: RE: how does the starting coil work exactly


Then what makes the current in the primary winding fluctuate? If the current is DC constant, there’s no flux change, and no high tension on the secondary. I suppose that there has to be some kind of mechanically fast interrupting device in the circuit of the primary winding of the booster coil ?

Jan


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese
Sent: maandag 18 december 2006 13:44
To: yak-list(at)matronics.com
Subject: Re: how does the starting coil work exactly


The starting coil is exactly the same for the 50, 52 and the CJ6. Parts are interchangeable. The spark is continuous as long as the start button is depressed.

Dennis


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dsavarese(at)elmore.rr.co
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PostPosted: Mon Dec 18, 2006 8:02 am    Post subject: how does the starting coil work exactly Reply with quote
There is a set of points.
Dennis

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ggg6(at)att.net
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PostPosted: Mon Dec 18, 2006 9:34 am    Post subject: how does the starting coil work exactly Reply with quote
These things operate on the same principal as the old Spark Vibirator Coils in the old Model "T" Fords..

Remember the old wooden box with the points on the top???

Gary Gabbard
[quote]-------------- Original message from "A. Dennis Savarese" <dsavarese(at)elmore.rr.com>: --------------

v\:* { BEHAVIOR: url(#default#VML) } o\:* { BEHAVIOR: url(#default#VML) } w\:* { BEHAVIOR: url(#default#VML) } .shape { BEHAVIOR: url(#default#VML) } There is a set of points.
Dennis

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jan.mevis(at)informavia.b
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PostPosted: Mon Dec 18, 2006 12:13 pm    Post subject: how does the starting coil work exactly Reply with quote
Thanks, I get the point! Nevertheless, it seems to work quite good, even if it’s “old” technology.

Jan Mevis


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of ggg6(at)att.net
Sent: maandag 18 december 2006 18:34
To: yak-list(at)matronics.com
Subject: Re: how does the starting coil work exactly


These things operate on the same principal as the old Spark Vibirator Coils in the old Model "T" Fords..

Remember the old wooden box with the points on the top???

Gary Gabbard [quote]
-------------- Original message from "A. Dennis Savarese" <dsavarese(at)elmore.rr.com>: --------------
There is a set of points.

Dennis


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