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dhkey(at)msn.com
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 Posted: Tue Jul 18, 2006 11:42 am Post subject: Starting Warp Drive Prop Pitch 13 degrees? |
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I am pitching my prop for the first time engine start and I wanted to know
what a good starting degree should be. I just need a ball park since I'll
adjust to rpm after things get going. I searched the archive and came up
with 11.5 deg. I'm running a 912 with a warp drive and didn't want the
engine to overrev so I figured 13 degrees would be a good start. Any
thoughts on this are welcome.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Jul 18, 2006 12:53 pm Post subject: Starting Warp Drive Prop Pitch 13 degrees? |
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I'm running a 912 with a warp drive and didn't want the
| engine to overrev so I figured 13 degrees would be a good start. Any
| thoughts on this are welcome.
The throttle will prevent over speeding the engine. You would have to
turn 5,800 rpm to red line it.
What diameter is your prop and how many blades?
Can't remember for sure, but I think I was pitched at 11.5 or 12.0 deg
when I was running a 912 with a 70" three blade Warp.
Presently running a 72" three blade Warp with a 912uls at 11.5, I
think.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Jul 18, 2006 1:14 pm Post subject: Starting Warp Drive Prop Pitch 13 degrees? |
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David K/Gang:
Also forgot to mention, the 912 and 912uls are started with the
throttle closed when using the enricher, and with just a "crack" of
throttle if starting without the enricher. I normally start mine
without the enricher, unless it is very cold. Well, for
Alabama.................has to get pretty cold.
Without enricher, if the engine does not fire immediately, release the
starter, reach up pull on th enricher, close throttle, hit starter.
If it doesn't fire immediately, you may not have enough voltage to
turn the engine 200 rpm in order to activate the CDI. If it does not
turn 200 rpm with starter, it will never start.
Only other factor that would prevent starting a 912UL and 912ULS is no
fuel, or spark plug gap too large, i.e., set at factory recommended
gap.
About .020 to .025" works great.
Sorry, got carried away............
john h mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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