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Maintenance costs: ULS vs iS, please

  • Andrew Nielsen
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2 months 1 week ago #16599 by Andrew Nielsen
Andrew Nielsen created the topic: Maintenance costs: ULS vs iS, please
Hi. What is the difference in maintenance cost between the ULS and the iS? If the iS is only a few thousand dollars more expensive, then how come it is not much more popular? (I searched the forums and the net and did not manage to find any answers). Thank you!

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  • Roger Lee
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2 months 6 days ago - 2 months 6 days ago #16602 by Roger Lee
Roger Lee replied the topic: Maintenance costs: ULS vs iS, please
The iS is a good engine, but it takes time to spread around the world.

The iS engine is new compared to the UL or ULS engine. When the iS engine came out aircraft builders had to redesign the firewall forward of their aircraft. This takes time and a lot of money. The engine is not a direct swap for the ULS. Then Rotax can only make so many at a time. I believe there are about 175-200 in the US and more builders are using it all the time.
Maintenance cost should be reasonably close between the two. Oil, plugs, rubber change and the annual. The one thing the iS engine needs is a "dongle" and laptop computer to do some maint. and perform diagnostics. The dongle is $1K. At this time there isn't as many people familiar with the iS maint. as there is with the UL series engine, but as time goes on more mechanics will be better prepared.

Does this help?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
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Last Edit: 2 months 6 days ago by Roger Lee.
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  • Bill Hertzel
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2 months 6 days ago #16604 by Bill Hertzel
Bill Hertzel replied the topic: Maintenance costs: ULS vs iS
The dongle is a one time expense.
If you have a mechanic that does your work, he should have his own "Dongle"

The plus side is that troubleshooting will be less expensive as the engine will be able to tell you what went wrong.
Intermittent errors are stored in the computer just like your cars OBD2 computer.

You will also never have to pay to have carburetors Rebuilt, Adjusted or re-Synced.

Crystal Ball:
Once the 915 Turbo engine is well in place; I can see Rotox offering only the fuel injected engines for new sales.
The Carb'd engines will be supported for a period of time and then fade into history much like happened in the auto industry 30 years ago.
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2 months 5 days ago #16617 by Andrew Nielsen
Andrew Nielsen replied the topic: Maintenance costs: ULS vs iS, please
Those are fantastic answers, thank you.

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