Huggy,
I own a 45' J-3C with a Continental A-65. Mostly stock with several bush mods though. PM me and I can give all the details you need. 46K for a Cub is hard to fathom. The LSA movement has ridiculously upped the base price for a decent Cub, but there aren't but a couple of Cubs in the whole country worth $46,000. The accepted base price for a flying Cub in any conditon is 25K, and it goes up exponentially based on fabric age, engine times, etc. Corrosion in the tube structure, fabric and engine are the three big factors that will suck 30K out of your pocket faster than anything once you get your 46K baby home. An A&P who knows Cubs (not just airplanes) is essential for the pre-buy. Sporty's sells a book written by a very knowledgeable guy regarding pre-buys on Aeroncas and long-wing Pipers.
A Cub burns 4 GPH for the A-65, 5 GPH if you're running a C-85 or C-90. No matter what engine, you aren't going anywhere fast in a Cub, but that's half the charm. The metal spars aren't a major advantage. The original spruce are just fine. I still have the original spars installed with no cracks or splinters. Some say the wood spars even ride a little smoother in rough air.
I throw about $7/hr into the maintenance fund each time I fly. It's not really going to help with the 10K engine overhaul, or the 12K re-cover, but it soothes my conscience.
I'm a fairly high time tailwheel guy and my insurance runs about $900/ a year through AUA. Yours will be based on the liability incurred by the least experienced taildragger pilot in your group.
I did several spread sheet only to determine that it would be much cheaper to rent the Cub at the local FBO for $68/hr as opposed to my $90/hr after all thing considered, but I couldn't put down a price on how much fun it is!
Check out
www.j3-cub.com and
www.supercub.org. Both are great references for Cubs of all sizes.
Mike-
