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I spoke with the Viking guy at Oshkosh last summer for half an hour or so. There was way too much talk of how the production engine would have this changed and that changed and something else made lighter or stronger. In other words, the prototype they had on display (one of only two engines that had flown, had just under 120 hours between them) was nowhere near the final configuration engine, and also, by the way, the final configuration engine was not yet real or built. It was all still figment of their imagination stuff. I think it is significant that the picture you sent a link for is a computer generated image, not a picture of a real engine turning a real propeller on a real airplane.
But they were taking deposits! For an engine that was not yet fully developed. Jim Bede did that with the BD-5 and a lot of people lost their shirts on that one. I left with the feeling it may evolve into a wonderful engine, but it was not ready for prime time yet.
Please be aware this is one person's gut feeling from a short exposure to a smooth talking spokesman and a prototype. I may have a good reading on this, I may not. I hope the engine turns out to be everything they say it will be, but I would not put money on one yet, myself. It looks like a very promising design, but it does not seem mature enough to market yet, to me.
At the very least, find out how many production configuration engines have been built, how many hours they have run them for, and what the internals looked like when they did a tear-down inspection of an engine with at least a few hundred hours on it. Also, get the results of their torsional vibration analysis for the reduction drive and the tear down inspection results for a high time gearbox. If you get good answers from all of that, it might be safe to order one.
If Jan says he has sold 35 Vikings to CH 750 builders, I would tend to believe him. I visited him at his hangar last winter three times over the course of a month and I was very impressed with all that he has been able to accomplish in a short time. Right now there aren't many Vikings flying (three, I think) but within a year there should be many more in the air in a number of different airframes.
I'm looking at it very carefully for my CH650. I understand that Viking has orders for over 60 engines, they have 300 trouble-free hours in a CH601HDS, and engines are also flying in a Highlander and a SeaRay.
At this price ($13K with engine mount) and power-to-weight ratio, I think this engine will be showing up in lots of airplanes.
I have a viking flying with 60 hour on now 9/12/13 on my ch750
all is OK thus far!