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Rotax 912S worth it?

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albertakolbmk3

Joined: 13 Jun 2009
Posts: 69
Location: Innisfail, AB

Posted: Sat Aug 29, 2009 3:02 pm Post subject: Rotax 912S worth it?

For the guys that have made the switch from 582 to 912S, was it worth it? Any noticeable differences in the way it flies?

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John Hauck

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

Posted: Sat Aug 29, 2009 3:27 pm Post subject: Rotax 912S worth it?

> For the guys that have made the switch from 582 to 912S, was it worth it? 

Any noticeable differences in the way it flies?

 	  Quote: 	
		  


	


Hi Tony/Gang:



I have flown my mkIII with 582, 912UL, and 912ULS.



The switch was worth it.



Yes, there are noticeable differences, primarily in performance increase. 

Not much faster in cruise and top speed, but climbs like a home sick angel.



I believe the best all around engine is the 912UL, 80 hp.  It operates on 

regular unleaded 87 octane fuel, spark plugs go 200 hours.



With a ground adjustable prop, the 912ULS is good for 95 hp at 5500 max 

coninuous rpm.  The 912UL still puts out close to 80 hp at 5500 max 

continuous.



Once you fly with a 912ULS, you won't want to go back.



jhohn h

mkIII

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

albertakolbmk3

Joined: 13 Jun 2009
Posts: 69
Location: Innisfail, AB

Posted: Sat Aug 29, 2009 4:23 pm Post subject: Re: Rotax 912S worth it?

John,



What are you running for a prop? How much work to convert. From what I can see in the pictures I've found guys still utilize the single boom setup. Off topic, I'm converting my tailfeather cables to the same adjustable setup you have. What size of turnbuckles did you use? Would you have a part number? I ordered some from aircraft spruce but they seem quite large for what they have to do. They are rated to 2200 lbs each. The part number from Aircraft Spruce was AN130-22S.



Tony

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John Hauck

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

Posted: Sat Aug 29, 2009 5:06 pm Post subject: Rotax 912S worth it?

 	  Quote: 	
		   What are you running for a prop? How much work to convert. From what I can 

 see in the pictures I've found guys still utilize the single boom setup. 

 Off topic, I'm converting my tailfeather cables to the same adjustable 

 setup you have. What size of turnbuckles did you use? Would you have a 

 part number? I ordered some from aircraft spruce but they seem quite large 

 for what they have to do. They are rated to 2200 lbs each. The part number 

 from Aircraft Spruce was AN130-22S.



 Tony


	




Tony/Gang:



Warp Drive 71", 3 blade, fast taper with nickle steel leading edges, and a 

4" prop extension.



Pretty simple to install a 912 on a MKIII.  Call Travis at TNK and get him 

to send you an installation kit, which utilizes same engine Lord Mounts as 

the 582.



I used same turnbuckles as the elevator cables use.  I don't know what size 

they are.  I am not located near my airplane.



john h

mkIII

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

John Bickham

Joined: 10 Jan 2006
Posts: 170
Location: St. Francisville, LA

Posted: Sat Aug 29, 2009 5:38 pm Post subject: Re: Rotax 912S worth it?

Tony,



Just to add to what John H said.



I have the 80 hp 912ul.  On the trip out west in May, I was flying with 3 others that had the 912ULS.  They had me by by a handful of MPH's.  I think I would run about 5200 RPM and they would be down under 5000 to stay together.



Besides the better climb and just a bit better cruise, they did a lot better at the higher altitudes during the mountain crossings.  They could go a bit higher, faster. At 10,000 feet I was not climbing very well and having to work to get back losses from downdrafts.



The other thing I might add as a positive to the 80 hp 912UL, besides operating on regular gas and the spark plugs lasting longer, is the fuel burn is a little lower.  I averaged right at 4.25 gph for the entire trip.  I think John H and the other 100 hp's were just a bit over 5 gph.  John H would have to verify that.



So I guess it depends on your flying.  Alberta is a bit higher than the swamps of Louisiana ain't it?  For down here, the 80 hp is just fine.  Just a bit more economical to operate.



Stats for trip:

http://www.kolbadventures.blogspot.com/



Hope this is helpful.

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_________________
Thanks too much,

John Bickham
Mark III-C w/ 912UL
St. Francisville, LA

I know many pilots and a few true aviators. There is a distinct difference that I have the greatest respect for.

R Harris

Joined: 14 Aug 2009
Posts: 4

Posted: Sat Aug 29, 2009 5:54 pm Post subject: Re: Rotax 912S worth it?

John are you coming thru AR. on this trip?  Would like you to look at my plane if you are. Food is still good and still got a extra bed.  I have even mowed the strip...



         Richard

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