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Old 11-08-2017, 10:05 AM
rv9builder rv9builder is offline
Join Date: Jan 2005
Location: Irvine, CA
Posts: 695
Default Which Rotax engine for your RV-12iS fuselage?

I received a notice from Vanís saying they need to know what engine Iíll be using before they ship my RV-12iS fuselage kit. Iím still on the fence on this. I like that the 912iS has fuel injection (no carb floats), better climb rate, and better fuel economy. But lighter weight and a $5,000 savings make the 912 ULS attractive, too. Which one would you choose?

RV-12iS Fuselage
RV-9A Project: Sold

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Old 11-08-2017, 10:23 AM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,449

If you were building a house, would you go with tile or granite counter tops?

Look at it this way..... California is going to charge you $1000.00 more than that in taxes when it gets registered.
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Last edited by gasman : 11-08-2017 at 10:29 AM.
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Old 11-08-2017, 11:20 AM
Larco Larco is offline
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,062

It might depend on what resale value means to you?
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Old 11-08-2017, 12:05 PM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,694

The iS has a larger alternator, if that matters to you.
Joe Gores
RV-12 Flying
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Old 11-08-2017, 12:37 PM
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XOverZero XOverZero is offline
Join Date: Aug 2010
Location: Irvine, CA
Posts: 395

Mark, let's talk. I'm on the same fence.
John Halcrow
Irvine, CA
RV-12 120682
Emp/TC done; Wings done; Fuse kit done

"History teaches us that men and nations behave wisely once they have exhausted all other alternatives." --Abba Eban
Paid up until Aug 2019
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Old 11-08-2017, 01:18 PM
skydiverlv skydiverlv is offline
Join Date: Jul 2008
Location: kansas
Posts: 287

If you were purchasing a new vehicle, would you consider archaic pre '70s engine management? You are getting more than fuel injection with the 912is.
One day, Rotax will not even offer the ULS new, as a complete assembly.
Get in on cutting edge technology!

Larry Vandegrift
ULPower 260is, dual ECUs, dual 30 amp alternators
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Old 11-08-2017, 02:44 PM
rjtjrt rjtjrt is offline
Join Date: Mar 2006
Location: Australia
Posts: 728

Originally Posted by Larco View Post
It might depend on what resale value means to you?
Resale value would be a consideration for me.
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Old 11-08-2017, 02:54 PM
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DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,896

Been flying a 912ULS equipped RV-12 for a couple of years. If I were building one now... I dunno. The extra cost and that expensive battery with a short history don't give me warm fuzzy feelings. But the extended range... that night do it for me. I do love efficiency. Even if it might actually never pay off in terms of fuel consumption, I've needed to stop for fuel 30-45 minutes short of my destination a few times. I'd love to not have to do that any more. And yes, you'll probably get that $5K back when you sell.
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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Old 11-08-2017, 03:29 PM
rgmwa rgmwa is offline
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,597

I'm happy with the ULS, but if I was building again I'd choose the iS. The extra cost will translate to a higher resale value, if that's a concern. My only hesitation would be the scarcity of trained and knowledgeable Rotax mechanics over here and the number of SB's I've seen for the relatively new iS to date, although both situations will improve over time. The ULS still gets its fair share of SB's too.
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Old 11-08-2017, 03:35 PM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,559

Personally, my impression is that there are enough overall improvements, airframe and engine, to make it a worthwhile choice.

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