Joseph,
Congratulations on getting started with your RV-10 kit.
The RV-10 is a fantastic airplane even with just the factory recommended IO-540. I am coming up on 3 years and over 300 hours great flying in my RV-10.
I talked to the owner of the turbine powered RV-10 at Osh this year and I can't say I was impressed. Like most, I am always looking for something new and exciting and a turbine on an RV always sounded good to me.
I have been around long enough to see these promises come and go and just like the RV turbine predecessors this one will most likely end up being one of a kind. I was told the fuel consumption to be over 20 gph and according to the owner cruise speeds around 140 kts
.
Compare that to 170ts at 12GPH with a good old fashioned IO-540.
He assured me that speeds and fuel consumption would improve once operating at the flight levels but now you must always have oxygen on board.
Certainly good to have but a lot of your flights are going to be an hour or 2 flying to lunch or something or sightseeing with friends and you just don't want to be at 20 000 feet for that.
He also metioned the cost to be over 100 000 dollars for the FW package.
You can buy 2 brand new IO -540 for that.
I can't tell you about the "instability " of the project but seeing it for sale
is not bolstering my confidence in the longevity of this turbine dream.
You asked... Just my opinion, stick with the factory plan unless you are truly an
engineering experimenter who has lots of money and knowledge to turn this dream into reality.