Today's Message Index:
----------------------
1. 03:43 AM - Distributor cap and rotor (lynnmatt@jps.net)
2. 06:05 AM - Distributor cap and rotor...off topic (Lynn Matteson)
3. 06:27 AM - Re: Distributor cap and rotor (gary aman)
4. 06:37 AM - Re: Distributor cap and rotor (gary aman)
5. 08:15 AM - Re: Distributor cap and rotor (Jabiru USA)
6. 11:47 AM - Re: Distributor cap and rotor...off topic (Rob Turk)
7. 01:17 PM - Re: Distributor cap and rotor...off topic (Noel Loveys)
8. 02:23 PM - Re: Distributor cap and rotor (gary aman)
9. 02:24 PM - Re: Distributor cap and rotor...off topic (Peter Harris)
10. 03:04 PM - Re: Distributor cap and rotor...off topic (Lynn Matteson)
11. 03:12 PM - Re: Distributor cap and rotor...off topic (Lynn Matteson)
12. 04:40 PM - Re: Distributor cap and rotor...off topic (Noel Loveys)
13. 09:53 PM - Re: Distributor cap and rotor...off topic (Lynn Matteson)
Message 1
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| Subject: | Distributor cap and rotor |
To follow up on the distributor cut-away picture, I just looked at my pictu
re info...here 'tis:
shutter speed 1/90 sec.
ISO 200
f/2.8
focal length 6.7mm
I had set the camera to "sports action" The camera is a Kodak Easy Share DX
6490
Pete asked to see the picture I took, and I sent it his way. I'm (attemptin
g to) posting it now and we'll see if it flies. : )
The shutter speed vs idle speed calculations work out like this: idle spee
d of (say) 900rpm divided by 60 sec = 15 rps crank speed divided by 2
= 7.5 rps cam (or distributor) speed times 360 degrees = 2700 degrees o
f rotation divided by 90 (1/90 shutter speed) = 30 degrees of rotation du
ring which the shutter fired.
Now I ask you...how lucky was I to get the rotor in just the exact position
to see the exact time that the spark fired? DAMN lucky, I'd say. And I jus
t went back and checked, and I had only made 6 shots, of which this shot wa
s number 4, so that makes it even more of a "lucky dog" shot...to borrow a
phrase from NASCAR. : )
Maybe somebody knows the speed of the spark as it occurs in a internal comb
ustion engine, I don't. But given a pretty short duration, that makes this
shot even more lucky.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/420+ hrs
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Message 2
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| Subject: | Distributor cap and rotor...off topic |
The first two times I tried to send this it bounced back with the
claim that it was too big so I cropped it down and now I'm adding a
'file name' to further satisfy Matronics requirements. If it doesn't
go this time, I'm giving up...
> To follow up on the distributor cut-away picture, I just looked at
> my picture info...here 'tis:
>
> shutter speed 1/90 sec.
> ISO 200
> f/2.8
> focal length 6.7mm
> I had set the camera to "sports action" The camera is a Kodak Easy
> Share DX6490
> Pete asked to see the picture I took, and I sent it his way. I'm
> (attempting to) posting it now and we'll see if it flies. : ) The
> shutter speed vs idle speed calculations work out like this: idle
> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
> divided by 2 = 7.5 rps cam (or distributor) speed times 360 degrees
> = 2700 degrees of rotation divided by 90 (1/90 shutter speed) = 30
> degrees of rotation during which the shutter fired. Now I ask
> you...how lucky was I to get the rotor in just the exact position
> to see the exact time that the spark fired? DAMN lucky, I'd say.
> And I just went back and checked, and I had only made 6 shots, of
> which this shot was number 4, so that makes it even more of a
> "lucky dog" shot...to borrow a phrase from NASCAR. : )
>
> Maybe somebody knows the speed of the spark as it occurs in a
> internal combustion engine, I don't. But given a pretty short
> duration, that makes this shot even more lucky.
>
> Lynn Matteson
> Grass Lake, Michigan
> Kitfox IV Speedster w/Jabiru 2200
> flying w/420+ hrs
>
Message 3
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| Subject: | Re: Distributor cap and rotor |
Good day,
I have been following the postings but may still need some info. I have an
early 2200 w/economy tuning I believe,Only 1 groove in the needle.My Exhaust
temps get near 1500 in cruise on cold mornings 1410 during the summer.I am uncomfortable
with these numbers and prefer temps in the 1300 range.Cyl heads show
just under 300.low speed adjustments are super sensitive,with temp changes.Can
I fatten it up a little
Thanx Gary Aman
It's on its way to you, Pete.
Lynn
On Oct 17, 2007, at 5:44 PM, Jabiru USA wrote:
>
>
> Lynn,
>
> I'd like to see that photo!
>
> Pete Krotje
> Jabiru USA Sport Aircraft, LLC
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Wednesday, October 17, 2007 4:08 PM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Distributor cap and rotor
>
>
>
> I just replaced the caps and rotors on my 2200, and decided to have
> some fun with the old parts. I bored 3/4" holes into one cap between
> the four spark plug wire terminals, and hogged out as much material
> as I could and still retain the strength of the cap. I then installed
> the cap and wires and fired up the engine. Using my digital camera, I
> got one shot out of the seven I took which showed the spark jumping
> the gap from the rotor to one of the segments...no big deal, just for
> my amusement.
>
> Lynn Matteson
> Grass Lake, Michigan
> Kitfox IV Speedster w/Jabiru 2200
> flying w/420+ hrs
> do not archive
>
>
Message 4
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| Subject: | Re: Distributor cap and rotor |
Good day,
I have been following the postings but may still need some info. I have an
early 2200 w/economy tuning I believe,Only 1 groove in the needle.My Exhaust
temps get near 1500 in cruise on cold mornings 1410 during the summer.I am uncomfortable
with these numbers and prefer temps in the 1300 range.Cyl heads show
just under 300.low speed adjustments are super sensitive,with temp changes.Can
I fatten it up a little
Thanx Gary Aman
It's on its way to you, Pete.
Lynn
On Oct 17, 2007, at 5:44 PM, Jabiru USA wrote:
>
>
> Lynn,
>
> I'd like to see that photo!
>
> Pete Krotje
> Jabiru USA Sport Aircraft, LLC
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Wednesday, October 17, 2007 4:08 PM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Distributor cap and rotor
>
>
>
> I just replaced the caps and rotors on my 2200, and decided to have
> some fun with the old parts. I bored 3/4" holes into one cap between
> the four spark plug wire terminals, and hogged out as much material
> as I could and still retain the strength of the cap. I then installed
> the cap and wires and fired up the engine. Using my digital camera, I
> got one shot out of the seven I took which showed the spark jumping
> the gap from the rotor to one of the segments...no big deal, just for
> my amusement.
>
> Lynn Matteson
> Grass Lake, Michigan
> Kitfox IV Speedster w/Jabiru 2200
> flying w/420+ hrs
> do not archive
>
>
Message 5
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| Subject: | Distributor cap and rotor |
Gary,
You can place a small washer (1/8 diameter or a washer from a #8 screw)
under the clip on the needle. That will hold the needle slightly higher in
the jet and create a richer mixture. Aim for a cruise EGT of 1350 to 1400
Pete
_____
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of gary aman
Sent: Thursday, October 18, 2007 8:27 AM
Subject: Re: JabiruEngine-List: Distributor cap and rotor
Good day,
I have been following the postings but may still need some info. I have
an early 2200 w/economy tuning I believe,Only 1 groove in the needle.My
Exhaust temps get near 1500 in cruise on cold mornings 1410 during the
summer.I am uncomfortable with these numbers and prefer temps in the 1300
range.Cyl heads show just under 300.low speed adjustments are super
sensitive,with temp changes.Can I fatten it up a little
Thanx Gary Aman
Lynn Matteson <lynnmatt@jps.net> wrote:
It's on its way to you, Pete.
Lynn
On Oct 17, 2007, at 5:44 PM, Jabiru USA wrote:
>
>
> Lynn,
>
> I'd like to see that photo!
>
> Pete Krotje
> Jabiru USA Sport Aircraft, LLC
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Wednesday, October 17, 2007 4:08 PM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Distributor cap and rotor
>
>
>
> I just replaced the caps and rotors on my 2200, and decided to have
> some fun with the old parts. I bored 3/4" holes into one cap between
> the four spark plug wire terminals, and hogged out as much material
> as I could and still retain the strength of the cap. I then
Message 6
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| Subject: | Re: Distributor cap and rotor...off topic |
Hi Lynn,
Impressive picture, funny to see how this works internally. However, I don't
think catching the spark is as much of a lucky shot as you think. With the
shutter open for 1/90th of a second, it records everything for 1/90th of a
second. This includes the 30 degrees of moving rotor (hence the blur), and
also the instant moment that the spark occurs even if that is just a
microsecond.
Best regards,
Rob
----- Original Message -----
From: "Lynn Matteson" <lynnmatt@jps.net>
Sent: Thursday, October 18, 2007 3:03 PM
Subject: JabiruEngine-List: Distributor cap and rotor...off topic
> The first two times I tried to send this it bounced back with the
> claim that it was too big so I cropped it down and now I'm adding a
> 'file name' to further satisfy Matronics requirements. If it doesn't
> go this time, I'm giving up...
>> To follow up on the distributor cut-away picture, I just looked at
>> my picture info...here 'tis:
>>
>> shutter speed 1/90 sec.
>> ISO 200
>> f/2.8
>> focal length 6.7mm
>> I had set the camera to "sports action" The camera is a Kodak Easy
>> Share DX6490
--------------------------------------------------------------------------------
>> Pete asked to see the picture I took, and I sent it his way. I'm
>> (attempting to) posting it now and we'll see if it flies. : ) The
>> shutter speed vs idle speed calculations work out like this: idle
>> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
>> divided by 2 = 7.5 rps cam (or distributor) speed times 360 degrees
>> = 2700 degrees of rotation divided by 90 (1/90 shutter speed) = 30
>> degrees of rotation during which the shutter fired. Now I ask
>> you...how lucky was I to get the rotor in just the exact position
>> to see the exact time that the spark fired? DAMN lucky, I'd say.
>> And I just went back and checked, and I had only made 6 shots, of
>> which this shot was number 4, so that makes it even more of a
>> "lucky dog" shot...to borrow a phrase from NASCAR. : )
>>
>> Maybe somebody knows the speed of the spark as it occurs in a
>> internal combustion engine, I don't. But given a pretty short
>> duration, that makes this shot even more lucky.
>>
>> Lynn Matteson
>> Grass Lake, Michigan
>> Kitfox IV Speedster w/Jabiru 2200
>> flying w/420+ hrs
>>
>
Message 7
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| Subject: | Distributor cap and rotor...off topic |
Lynn do you want to tell him what you did for a living or can I :-)
Noel
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On
> Behalf Of Rob Turk
> Sent: Thursday, October 18, 2007 4:15 PM
> To: jabiruengine-list@matronics.com
> Subject: Re: JabiruEngine-List: Distributor cap and rotor...off topic
>
>
> <matronics@rtist.nl>
>
> Hi Lynn,
>
> Impressive picture, funny to see how this works internally.
> However, I don't
> think catching the spark is as much of a lucky shot as you
> think. With the
> shutter open for 1/90th of a second, it records everything
> for 1/90th of a
> second. This includes the 30 degrees of moving rotor (hence
> the blur), and
> also the instant moment that the spark occurs even if that is just a
> microsecond.
>
> Best regards,
> Rob
>
> ----- Original Message -----
> From: "Lynn Matteson" <lynnmatt@jps.net>
> To: <jabiruengine-list@matronics.com>
> Sent: Thursday, October 18, 2007 3:03 PM
> Subject: JabiruEngine-List: Distributor cap and rotor...off topic
>
>
> > The first two times I tried to send this it bounced back with the
> > claim that it was too big so I cropped it down and now I'm adding a
> > 'file name' to further satisfy Matronics requirements. If it doesn't
> > go this time, I'm giving up...
> >> To follow up on the distributor cut-away picture, I just looked at
> >> my picture info...here 'tis:
> >>
> >> shutter speed 1/90 sec.
> >> ISO 200
> >> f/2.8
> >> focal length 6.7mm
> >> I had set the camera to "sports action" The camera is a Kodak Easy
> >> Share DX6490
>
>
> --------------------------------------------------------------
> ------------------
>
>
> >> Pete asked to see the picture I took, and I sent it his way. I'm
> >> (attempting to) posting it now and we'll see if it flies. : ) The
> >> shutter speed vs idle speed calculations work out like this: idle
> >> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
> >> divided by 2 = 7.5 rps cam (or distributor) speed times 360 degrees
> >> = 2700 degrees of rotation divided by 90 (1/90 shutter speed) = 30
> >> degrees of rotation during which the shutter fired. Now I ask
> >> you...how lucky was I to get the rotor in just the exact position
> >> to see the exact time that the spark fired? DAMN lucky, I'd say.
> >> And I just went back and checked, and I had only made 6 shots, of
> >> which this shot was number 4, so that makes it even more of a
> >> "lucky dog" shot...to borrow a phrase from NASCAR. : )
> >>
> >> Maybe somebody knows the speed of the spark as it occurs in a
> >> internal combustion engine, I don't. But given a pretty short
> >> duration, that makes this shot even more lucky.
> >>
> >> Lynn Matteson
> >> Grass Lake, Michigan
> >> Kitfox IV Speedster w/Jabiru 2200
> >> flying w/420+ hrs
> >>
> >
>
>
>
>
>
>
Message 8
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| Subject: | Distributor cap and rotor |
Thanks Pete,I'll give it a try.
G Aman
Jabiru USA <info@usjabiru.com> wrote: v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape
{behavior:url(#default#VML);} st1\:*{behavior:url(#default#ieooui) }
Gary,
You can place a small washer (1/8 diameter or a washer from a #8 screw) under
the clip on the needle. That will hold the needle slightly higher in the jet
and create a richer mixture. Aim for a cruise EGT of 1350 to 1400
Pete
---------------------------------
From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of gary aman
Sent: Thursday, October 18, 2007 8:27 AM
To: jabiruengine-list@matronics.com
Subject: Re: JabiruEngine-List: Distributor cap and rotor
Good day,
I have been following the postings but may still need some info. I have an
early 2200 w/economy tuning I believe,Only 1 groove in the needle.My Exhaust
temps get near 1500 in cruise on cold mornings 1410 during the summer.I am uncomfortable
with these numbers and prefer temps in the 1300 range.Cyl heads show
just under 300.low speed adjustments are super sensitive,with temp changes.Can
I fatten it up a little
Thanx Gary Aman
Lynn Matteson <lynnmatt@jps.net> wrote:
It's on its way to you, Pete.
Lynn
On Oct 17, 2007, at 5:44 PM, Jabiru USA wrote:
>
>
> Lynn,
>
> I'd like to see that photo!
>
> Pete Krotje
> Jabiru USA Sport Aircraft, LLC
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Wednesday, October 17, 2007 4:08 PM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Distributor cap and rotor
>
>
>
> I just replaced the caps and rotors on my 2200, and decided to have
> some fun with the old parts. I bored 3/4" holes into one cap between
> the four spark plug wire terminals, and hogged out as much material
> as I could and still retain the strength of the cap. I then
Message 9
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|
| Subject: | Distributor cap and rotor...off topic |
Lynn,
The spark is gold coloured?
Looks clean.
Peter H
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Lynn
Matteson
Sent: Thursday, 18 October 2007 11:03 PM
Subject: JabiruEngine-List: Distributor cap and rotor...off topic
The first two times I tried to send this it bounced back with the
claim that it was too big so I cropped it down and now I'm adding a
'file name' to further satisfy Matronics requirements. If it doesn't
go this time, I'm giving up...
> To follow up on the distributor cut-away picture, I just looked at
> my picture info...here 'tis:
>
> shutter speed 1/90 sec.
> ISO 200
> f/2.8
> focal length 6.7mm
> I had set the camera to "sports action" The camera is a Kodak Easy
> Share DX6490
Message 10
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|
| Subject: | Re: Distributor cap and rotor...off topic |
No, the spark is blue-ish white...it's the rotor that is gold
colored. The silver-colored item is the segment imbedded in the cap
that the rotor delivers the spark to, and connects to the spark plug
via the individual wire.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/420+ hrs
On Oct 18, 2007, at 5:24 PM, Peter Harris wrote:
> <peterjfharris@bigpond.com>
>
> Lynn,
> The spark is gold coloured?
> Looks clean.
> Peter H
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Thursday, 18 October 2007 11:03 PM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Distributor cap and rotor...off topic
>
> The first two times I tried to send this it bounced back with the
> claim that it was too big so I cropped it down and now I'm adding a
> 'file name' to further satisfy Matronics requirements. If it doesn't
> go this time, I'm giving up...
>> To follow up on the distributor cut-away picture, I just looked at
>> my picture info...here 'tis:
>>
>> shutter speed 1/90 sec.
>> ISO 200
>> f/2.8
>> focal length 6.7mm
>> I had set the camera to "sports action" The camera is a Kodak Easy
>> Share DX6490
>
Message 11
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| Subject: | Re: Distributor cap and rotor...off topic |
Ok, Rob, I'll settle for "highly skilled, trained, etc" for
lucky. : ) But remember, there's the other 330 degrees of that circle
that I DIDN'T manage to capture, and that's what all the other shots
show...nothing.
I suppose if I had really wanted to stop the action cold, I could
have rigged a trigger of some sort that would have fired the shutter
at a point just prior to the rotor lining up with the cap segment,
but I never got into those kind of electronic triggers in my 20+
years as a photographer.
Lynn
On Oct 18, 2007, at 4:17 PM, Noel Loveys wrote:
> <noelloveys@yahoo.ca>
>
> Lynn do you want to tell him what you did for a living or can I :-)
>
> Noel
>
>> -----Original Message-----
>> From: owner-jabiruengine-list-server@matronics.com
>> [mailto:owner-jabiruengine-list-server@matronics.com] On
>> Behalf Of Rob Turk
>> Sent: Thursday, October 18, 2007 4:15 PM
>> To: jabiruengine-list@matronics.com
>> Subject: Re: JabiruEngine-List: Distributor cap and rotor...off topic
>>
>>
>> <matronics@rtist.nl>
>>
>> Hi Lynn,
>>
>> Impressive picture, funny to see how this works internally.
>> However, I don't
>> think catching the spark is as much of a lucky shot as you
>> think. With the
>> shutter open for 1/90th of a second, it records everything
>> for 1/90th of a
>> second. This includes the 30 degrees of moving rotor (hence
>> the blur), and
>> also the instant moment that the spark occurs even if that is just a
>> microsecond.
>>
>> Best regards,
>> Rob
>>
>> ----- Original Message -----
>> From: "Lynn Matteson" <lynnmatt@jps.net>
>> To: <jabiruengine-list@matronics.com>
>> Sent: Thursday, October 18, 2007 3:03 PM
>> Subject: JabiruEngine-List: Distributor cap and rotor...off topic
>>
>>
>>> The first two times I tried to send this it bounced back with the
>>> claim that it was too big so I cropped it down and now I'm adding a
>>> 'file name' to further satisfy Matronics requirements. If it doesn't
>>> go this time, I'm giving up...
>>>> To follow up on the distributor cut-away picture, I just looked at
>>>> my picture info...here 'tis:
>>>>
>>>> shutter speed 1/90 sec.
>>>> ISO 200
>>>> f/2.8
>>>> focal length 6.7mm
>>>> I had set the camera to "sports action" The camera is a Kodak Easy
>>>> Share DX6490
>>
>>
>> --------------------------------------------------------------
>> ------------------
>>
>>
>>>> Pete asked to see the picture I took, and I sent it his way. I'm
>>>> (attempting to) posting it now and we'll see if it flies. : ) The
>>>> shutter speed vs idle speed calculations work out like this: idle
>>>> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
>>>> divided by 2 = 7.5 rps cam (or distributor) speed times 360 degrees
>>>> = 2700 degrees of rotation divided by 90 (1/90 shutter speed) = 30
>>>> degrees of rotation during which the shutter fired. Now I ask
>>>> you...how lucky was I to get the rotor in just the exact position
>>>> to see the exact time that the spark fired? DAMN lucky, I'd say.
>>>> And I just went back and checked, and I had only made 6 shots, of
>>>> which this shot was number 4, so that makes it even more of a
>>>> "lucky dog" shot...to borrow a phrase from NASCAR. : )
>>>>
>>>> Maybe somebody knows the speed of the spark as it occurs in a
>>>> internal combustion engine, I don't. But given a pretty short
>>>> duration, that makes this shot even more lucky.
>>>>
>>>> Lynn Matteson
>>>> Grass Lake, Michigan
>>>> Kitfox IV Speedster w/Jabiru 2200
>>>> flying w/420+ hrs
>>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
Message 12
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|
| Subject: | Distributor cap and rotor...off topic |
I'd just use a long exposure... No other light except what is caused by the
spark. 1/4 sec on manual should give an excellent result. For higher
shutter speeds just rev the engine a bit before firing the shutter. @ 2000
rpm each terminal should fire 1000 times a minute or 16 times a second a
shutter speed of 1/8 sec should produce 1 spark 50 % of the time and 2 over
lapping sparks the other 50% of the time. You then only have to experiment
with the aperture to get a pleasing result. BTW the probability of getting
a single spark at 1/90sec is approximately 1: 5.6 @2000rpm.
But you were using a digital camera which has a delay between the trigger
and the actual capture ( being careful not to mention shutter) That now
reduces things to chance until the capture duration is sufficiently long
enough to see one or more sparks.
I used to do "Photo Painting " That is where I would set up inside a
totally dark room and fire one small flash several times from different
angles and distances to attain a specific lighting pattern. I also used it
to do things like the ball in a cigar box... With a bit of work it was easy
to make a good quality model car look like the real thing.
Noel
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On
> Behalf Of Lynn Matteson
> Sent: Thursday, October 18, 2007 7:40 PM
> To: jabiruengine-list@matronics.com
> Subject: Re: JabiruEngine-List: Distributor cap and rotor...off topic
>
>
> <lynnmatt@jps.net>
>
> Ok, Rob, I'll settle for "highly skilled, trained, etc" for
> lucky. : ) But remember, there's the other 330 degrees of
> that circle
> that I DIDN'T manage to capture, and that's what all the other shots
> show...nothing.
> I suppose if I had really wanted to stop the action cold, I could
> have rigged a trigger of some sort that would have fired the shutter
> at a point just prior to the rotor lining up with the cap segment,
> but I never got into those kind of electronic triggers in my 20+
> years as a photographer.
>
> Lynn
>
> On Oct 18, 2007, at 4:17 PM, Noel Loveys wrote:
>
> > <noelloveys@yahoo.ca>
> >
> > Lynn do you want to tell him what you did for a living or can I :-)
> >
> > Noel
> >
> >> -----Original Message-----
> >> From: owner-jabiruengine-list-server@matronics.com
> >> [mailto:owner-jabiruengine-list-server@matronics.com] On
> >> Behalf Of Rob Turk
> >> Sent: Thursday, October 18, 2007 4:15 PM
> >> To: jabiruengine-list@matronics.com
> >> Subject: Re: JabiruEngine-List: Distributor cap and
> rotor...off topic
> >>
> >>
> >> <matronics@rtist.nl>
> >>
> >> Hi Lynn,
> >>
> >> Impressive picture, funny to see how this works internally.
> >> However, I don't
> >> think catching the spark is as much of a lucky shot as you
> >> think. With the
> >> shutter open for 1/90th of a second, it records everything
> >> for 1/90th of a
> >> second. This includes the 30 degrees of moving rotor (hence
> >> the blur), and
> >> also the instant moment that the spark occurs even if that
> is just a
> >> microsecond.
> >>
> >> Best regards,
> >> Rob
> >>
> >> ----- Original Message -----
> >> From: "Lynn Matteson" <lynnmatt@jps.net>
> >> To: <jabiruengine-list@matronics.com>
> >> Sent: Thursday, October 18, 2007 3:03 PM
> >> Subject: JabiruEngine-List: Distributor cap and rotor...off topic
> >>
> >>
> >>> The first two times I tried to send this it bounced back with the
> >>> claim that it was too big so I cropped it down and now
> I'm adding a
> >>> 'file name' to further satisfy Matronics requirements. If
> it doesn't
> >>> go this time, I'm giving up...
> >>>> To follow up on the distributor cut-away picture, I just
> looked at
> >>>> my picture info...here 'tis:
> >>>>
> >>>> shutter speed 1/90 sec.
> >>>> ISO 200
> >>>> f/2.8
> >>>> focal length 6.7mm
> >>>> I had set the camera to "sports action" The camera is a
> Kodak Easy
> >>>> Share DX6490
> >>
> >>
> >> --------------------------------------------------------------
> >> ------------------
> >>
> >>
> >>>> Pete asked to see the picture I took, and I sent it his way. I'm
> >>>> (attempting to) posting it now and we'll see if it flies. : ) The
> >>>> shutter speed vs idle speed calculations work out like this: idle
> >>>> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
> >>>> divided by 2 = 7.5 rps cam (or distributor) speed times
> 360 degrees
> >>>> = 2700 degrees of rotation divided by 90 (1/90 shutter
> speed) = 30
> >>>> degrees of rotation during which the shutter fired. Now I ask
> >>>> you...how lucky was I to get the rotor in just the exact position
> >>>> to see the exact time that the spark fired? DAMN lucky, I'd say.
> >>>> And I just went back and checked, and I had only made 6 shots, of
> >>>> which this shot was number 4, so that makes it even more of a
> >>>> "lucky dog" shot...to borrow a phrase from NASCAR. : )
> >>>>
> >>>> Maybe somebody knows the speed of the spark as it occurs in a
> >>>> internal combustion engine, I don't. But given a pretty short
> >>>> duration, that makes this shot even more lucky.
> >>>>
> >>>> Lynn Matteson
> >>>> Grass Lake, Michigan
> >>>> Kitfox IV Speedster w/Jabiru 2200
> >>>> flying w/420+ hrs
> >>>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
Message 13
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|
| Subject: | Re: Distributor cap and rotor...off topic |
I thought about doing all those photographic methods, Noel, but the
thought of waiting until dark or having a light-excluding blanket
thrown over the engine wasn't very appealing,with the prop sixteen
inches away from my left shoulder. Setting up a tripod, or rigging a
camera support wasn't exactly on my list of fun projects for the day
either. As it was, I had the plane strapped from going anywhere, was
doing all the starting and engine controls by myself, and not
mentioning that there was a little wind being generated by the prop.
I guess somewhere along the way...after I retired...I became more of
an aircraft person, and less of a photographer. : )
Lynn
On Oct 18, 2007, at 7:38 PM, Noel Loveys wrote:
> <noelloveys@yahoo.ca>
>
> I'd just use a long exposure... No other light except what is
> caused by the
> spark. 1/4 sec on manual should give an excellent result. For higher
> shutter speeds just rev the engine a bit before firing the
> shutter. @ 2000
> rpm each terminal should fire 1000 times a minute or 16 times a
> second a
> shutter speed of 1/8 sec should produce 1 spark 50 % of the time
> and 2 over
> lapping sparks the other 50% of the time. You then only have to
> experiment
> with the aperture to get a pleasing result. BTW the probability of
> getting
> a single spark at 1/90sec is approximately 1: 5.6 @2000rpm.
>
> But you were using a digital camera which has a delay between the
> trigger
> and the actual capture ( being careful not to mention shutter)
> That now
> reduces things to chance until the capture duration is sufficiently
> long
> enough to see one or more sparks.
>
> I used to do "Photo Painting " That is where I would set up inside a
> totally dark room and fire one small flash several times from
> different
> angles and distances to attain a specific lighting pattern. I also
> used it
> to do things like the ball in a cigar box... With a bit of work it
> was easy
> to make a good quality model car look like the real thing.
> Noel
>
>> -----Original Message-----
>> From: owner-jabiruengine-list-server@matronics.com
>> [mailto:owner-jabiruengine-list-server@matronics.com] On
>> Behalf Of Lynn Matteson
>> Sent: Thursday, October 18, 2007 7:40 PM
>> To: jabiruengine-list@matronics.com
>> Subject: Re: JabiruEngine-List: Distributor cap and rotor...off topic
>>
>>
>> <lynnmatt@jps.net>
>>
>> Ok, Rob, I'll settle for "highly skilled, trained, etc" for
>> lucky. : ) But remember, there's the other 330 degrees of
>> that circle
>> that I DIDN'T manage to capture, and that's what all the other shots
>> show...nothing.
>> I suppose if I had really wanted to stop the action cold, I could
>> have rigged a trigger of some sort that would have fired the shutter
>> at a point just prior to the rotor lining up with the cap segment,
>> but I never got into those kind of electronic triggers in my 20+
>> years as a photographer.
>>
>> Lynn
>>
>> On Oct 18, 2007, at 4:17 PM, Noel Loveys wrote:
>>
>>> <noelloveys@yahoo.ca>
>>>
>>> Lynn do you want to tell him what you did for a living or can I :-)
>>>
>>> Noel
>>>
>>>> -----Original Message-----
>>>> From: owner-jabiruengine-list-server@matronics.com
>>>> [mailto:owner-jabiruengine-list-server@matronics.com] On
>>>> Behalf Of Rob Turk
>>>> Sent: Thursday, October 18, 2007 4:15 PM
>>>> To: jabiruengine-list@matronics.com
>>>> Subject: Re: JabiruEngine-List: Distributor cap and
>> rotor...off topic
>>>>
>>>>
>>>> <matronics@rtist.nl>
>>>>
>>>> Hi Lynn,
>>>>
>>>> Impressive picture, funny to see how this works internally.
>>>> However, I don't
>>>> think catching the spark is as much of a lucky shot as you
>>>> think. With the
>>>> shutter open for 1/90th of a second, it records everything
>>>> for 1/90th of a
>>>> second. This includes the 30 degrees of moving rotor (hence
>>>> the blur), and
>>>> also the instant moment that the spark occurs even if that
>> is just a
>>>> microsecond.
>>>>
>>>> Best regards,
>>>> Rob
>>>>
>>>> ----- Original Message -----
>>>> From: "Lynn Matteson" <lynnmatt@jps.net>
>>>> To: <jabiruengine-list@matronics.com>
>>>> Sent: Thursday, October 18, 2007 3:03 PM
>>>> Subject: JabiruEngine-List: Distributor cap and rotor...off topic
>>>>
>>>>
>>>>> The first two times I tried to send this it bounced back with the
>>>>> claim that it was too big so I cropped it down and now
>> I'm adding a
>>>>> 'file name' to further satisfy Matronics requirements. If
>> it doesn't
>>>>> go this time, I'm giving up...
>>>>>> To follow up on the distributor cut-away picture, I just
>> looked at
>>>>>> my picture info...here 'tis:
>>>>>>
>>>>>> shutter speed 1/90 sec.
>>>>>> ISO 200
>>>>>> f/2.8
>>>>>> focal length 6.7mm
>>>>>> I had set the camera to "sports action" The camera is a
>> Kodak Easy
>>>>>> Share DX6490
>>>>
>>>>
>>>> --------------------------------------------------------------
>>>> ------------------
>>>>
>>>>
>>>>>> Pete asked to see the picture I took, and I sent it his way. I'm
>>>>>> (attempting to) posting it now and we'll see if it flies. : ) The
>>>>>> shutter speed vs idle speed calculations work out like this: idle
>>>>>> speed of (say) 900rpm divided by 60 sec = 15 rps crank speed
>>>>>> divided by 2 = 7.5 rps cam (or distributor) speed times
>> 360 degrees
>>>>>> = 2700 degrees of rotation divided by 90 (1/90 shutter
>> speed) = 30
>>>>>> degrees of rotation during which the shutter fired. Now I ask
>>>>>> you...how lucky was I to get the rotor in just the exact position
>>>>>> to see the exact time that the spark fired? DAMN lucky, I'd say.
>>>>>> And I just went back and checked, and I had only made 6 shots, of
>>>>>> which this shot was number 4, so that makes it even more of a
>>>>>> "lucky dog" shot...to borrow a phrase from NASCAR. : )
>>>>>>
>>>>>> Maybe somebody knows the speed of the spark as it occurs in a
>>>>>> internal combustion engine, I don't. But given a pretty short
>>>>>> duration, that makes this shot even more lucky.
>>>>>>
>>>>>> Lynn Matteson
>>>>>> Grass Lake, Michigan
>>>>>> Kitfox IV Speedster w/Jabiru 2200
>>>>>> flying w/420+ hrs
>>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
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