I just emailed Carl Goldberg about what they thought about using a MVVS 1.60 (Gas) engine in the Obsession. I haven't heard back from them yet, but I'm guessing they will write back saying that they don't recommend it (since they don't mention gas engines in their specs). I've had similar responses on other Goldberg models.

If I do end up buying the Obsession, and putting it together (which is another problem in itself....I build VERY slowly, and sometimes not at all), I'll definitely write about my experience in this thread. Right now it's a big 'IF' though? For one thing, I've been out of work for awhile, and have to plan out my airplane purchases real carefully. Secondly, the weight is a major concern. Since most people don't recommend going over 11 pounds (12 pounds at the absolute most) with the MVVS 1.60 gas engine. I'm guessing the Obsession will come out some where between 13-14 pounds from what I've read. The only thing that gives me a little hope is that I've read from several people that said it performs nicely using an O.S. 1.60 with a pitts style muffler, and the MVVS 1.60 with a tuned pipe puts out more power than this setup. The only penalty is that the gas setup weighs at least a 1/2 pound more than the glow setup.

If I don't end up buying the Obsession, my only other choice right now for an airframe for my MVVS 1.60 (in the same price range) would be the Hanger 9 FuntanaX 100. It's got 150 sq. in. less wing area, but the projected weight is 2-3 pounds less than the Obsession! It may be possible to use the MVVS 1.60 in the FuntanaX 100, and still come in around 10-11 pounds!

I feel the same as you though...I'd like to get to the point where all my planes are either gas or electric. I don't like having to drive 40 miles to the nearest hobby store to pay $14-$15 per gallon for glow fuel. I don't like having to bring glow plugs, glow drivers, starters, and any other glow related equipment to the field, and most of all...I HATE CLEANING UP AFTER FLYING!!! Right now I still fly some glow planes, but unlike you, I don't like using any glow engine larger then .46 (even though I do occasionally use my trusty old O.S. 90 4-Cycle when the application demands it).

Mark