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912S engine start

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Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Jan 10, 2011 8:38 am Post subject: 912S engine start

Started my engine for the first time yesterday.  It had been sitting in the basement for about a year but started immediately and sounded great.  Have to do some throttle adjustments and prop pitch changes.  I had about 5700 rpm and still had some throttle to go.  I used 10 degree angle on a 70" three blade warp prop.  Will try 12 degrees and see how that works.



Rex

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Jan 10, 2011 9:00 am Post subject: 912S engine start

Started my engine for the first time yesterday.  It had been sitting in the 

basement for about a year but started immediately and sounded great.  Have 

to do some throttle adjustments and prop pitch changes.  I had about 5700 

rpm and still had some throttle to go.  I used 10 degree angle on a 70" 

three blade warp prop.  Will try 12 degrees and see how that works.



Rex

Rex R/Gang:



I prop for 5400 static WOT.



That gives me 5500 WOT straight and level with my MKIII.



john h

mkIII

912ULS

71" Warp Drive 3 Blade Fast Taper

Titus, Alabama - Freezing rain.  Woke up to 32F.  Now 33F.  Think I'll stay 

inside today.

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Jan 10, 2011 9:08 am Post subject: Re: 912S engine start

Thanks John. Do you remember what angle you used?

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neilsenrm(at)gmail.com
Guest

Posted: Mon Jan 10, 2011 10:12 am Post subject: 912S engine start

John

  

 The manual for the SportCruiser says that Rotax 912 ULS should be operated normal cruise at 4,800-5,300 but with 100LL 5,000-5,300. I assume this is to deal with the high lead content of 100LL. Interesting.

  

 Rick Neilsen

Redrive VW Powered MKIIIC



 On Mon, Jan 10, 2011 at 11:55 AM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:

 [quote]--> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>

  



 Started my engine for the first time yesterday.  It had been sitting in the

basement for about a year but started immediately and sounded great.  Have

to do some throttle adjustments and prop pitch changes.  I had about 5700

 rpm and still had some throttle to go.  I used 10 degree angle on a 70"

three blade warp prop.  Will try 12 degrees and see how that works.



Rex



Rex R/Gang:



I prop for 5400 static WOT.

 

That gives me 5500 WOT straight and level with my MKIII.



john h

mkIII

912ULS

71" Warp Drive 3 Blade Fast Taper

Titus, Alabama - Freezing rain.  Woke up to 32F.  Now 33F.  Think I'll stay

 inside today.

  

  List Un/Subscription,

 www.matronics.com/Navigator?Kolb-List" target="_blank">http://www.matronics.com/Navigator?Kolb-List

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Jan 10, 2011 10:39 am Post subject: 912S engine start

The manual for the SportCruiser says that Rotax 912 ULS should be operated

normal cruise at 4,800-5,300 but with 100LL 5,000-5,300. I assume this is to

deal with the high lead content of 100LL. Interesting.



Rick Neilsen



Rick N/Folks:



Yes, I'd think it had to do with lots of lead.



john h

mkIII

Titus, AL

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Jan 10, 2011 11:00 am Post subject: 912S engine start

Thanks John.  Do you remember what angle you used?



 **********************************



Not for sure.



12 to 12.5 sounds pretty good.  Each engine and prop will have its own 

setting.  Main thing when you get it dialed in close is to insure all three 

blades are set the same, even if it was over or under 5500 WOT straight and 

level flight, by just a little bit.  I doubt most of our tachs are all that 

accurate anyhow.  I usually do a prop tach check when I adjust my prop to 

insure my engine tach is close.



john h

mkIII

Titus, AL

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Jan 10, 2011 12:03 pm Post subject: Re: 912S engine start

I'll try 12 degrees and see what happens.  I have an E.I.S. and also a tach guage.  They were within about 25 rpm of each other as best I could see so I'm comfortable that it's a good reading.



The Rotax manual that I have ok's a max. continuous speed of 5500 rpm but 5 minutes only at 5800 rpm.



Rex

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Jan 10, 2011 12:25 pm Post subject: 912S engine start

The Rotax manual that I have ok's a max. continuous speed of 5500 rpm but 5 

minutes only at 5800 rpm.



Rex



Rex/Gang:



That is why we pitch for 5500 straight and level WOT with a fixed pitch or 

ground adjustable prop.  If we pitch for 5800 we have terrific climb and 

poor cruise.  Pitch for 5500 and we get the best climb and cruise combo.



5800 could be used for 5 min if you had an inflight adjustable prop, which 

would be a nice toy, but not really necessary to have fun and fly where you 

want to.  I have never had a problem being pitched for 5500.



john h

mkIII

Titus, Alabama

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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