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matronics(at)rtist.nl
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 Posted: Thu Oct 18, 2007 10:47 am Post subject: Distributor cap and rotor...off topic |
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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
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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Peter H
Joined: 20 Mar 2007
Posts: 197
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| Posted: Thu Oct 18, 2007 1:24 pm Post subject: Distributor cap and rotor...off topic |
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Lynn,
The spark is gold coloured?
Looks clean.
Peter H
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Oct 18, 2007 2:04 pm Post subject: Distributor cap and rotor...off topic |
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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:
[quote]
<peterjfharris(at)bigpond.com>
Lynn,
The spark is gold coloured?
Looks clean.
Peter H
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Oct 18, 2007 2:12 pm Post subject: Distributor cap and rotor...off topic |
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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:
[quote]
<noelloveys(at)yahoo.ca>
Lynn do you want to tell him what you did for a living or can I 
Noel
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Thu Oct 18, 2007 3:40 pm Post subject: Distributor cap and rotor...off topic |
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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. (at) 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 (at)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
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Oct 18, 2007 8:53 pm Post subject: Distributor cap and rotor...off topic |
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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:
[quote]
<noelloveys(at)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. (at) 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 (at)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
> --
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Oct 19, 2007 4:23 pm Post subject: Distributor cap and rotor...off topic |
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That's Ok .... I forgot a bout the prop..... One of those things about
being inside the plane when the engine is running. I still hate ducking
under the boom of a chopper during run up... The little voice keeps telling
me to walk around the front and be seen. Crawling up to check something
under the cowl with the rotors turning doesn't bother me at all. If some
one yells "Duck!" I won't look up and say "Where?"
As for the tail rotor That is really the most dangerous part!
Noel
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Fri Oct 19, 2007 6:42 pm Post subject: Distributor cap and rotor...off topic |
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Whenever I'm running my engine, even thought I can hear it, I keep
saying out loud "the prop is turning, the engine is running, the prop
is turning...", lest I lapse into stupidity, and walk into it.
While shooting the distributor shots, I had intended to have a fire
extinguisher on hand, outside the plane (besides the one strapped
onto the console) in case the open sparks decided to ignite any fumes
that might be lurking around the vicinity of the carburetor, but I
forgot to do this. I'll just bet that any sudden fire that might have
erupted would have been reason enough to celebrate by flailing ones
arms about the vicinity of the prop circle. : ) Thank God this didn't
happen.
Tail rotors...yikes!
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/420+ hrs
On Oct 19, 2007, at 8:23 PM, Noel Loveys wrote:
| Quote: |
<noelloveys(at)yahoo.ca>
That's Ok .... I forgot a bout the prop..... One of those things
about
being inside the plane when the engine is running. I still hate
ducking
under the boom of a chopper during run up... The little voice
keeps telling
me to walk around the front and be seen. Crawling up to check
something
under the cowl with the rotors turning doesn't bother me at all.
If some
one yells "Duck!" I won't look up and say "Where?"
As for the tail rotor That is really the most dangerous part!
Noel
|
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http://www.matronics.com/Navigator?JabiruEngine-List |
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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