Emory Bored wrote:Oh, and I called a guy with a 65hp BC12D located close by. He said that it "only" weighed 823# empty! Holy mackerel,
A T-craft can be kept light enough, but attention must be paid to the details large and small, and choices must be made. The newer smaller lightweight starters from B&C should fit on the short engine mount. But you don't really need it on a properly setup C-85. Stewart Systems covering saves 15 pounds of weight according to them and I believe it. The small handheld radios and GPS units weigh less than built-in stuff, and you save ten pounds of built-in battery. A padded interior with fancy tuck and roll whorehouse amenities does not belong in a T-craft. An (illegal) fiberglass tailwheel spring will save almost five pounds! The right side control yoke saves a few pounds whenever you don't use it. Those awful, pain in the ass, never fit right anyway, metal wing root "fairings" weigh five pounds and fabric glued on looks better, seals better, and weighs five ounces. How much have we saved so far?
Yes there is a small amount of pain and suffering to convert the airplane from 65 to 85. Can't lie about it, been there, done that on my 1940 BC-65. It is an FAA approved STC, available from Terry Bowden.
The only large problem is that this "conversion" was never designed to be a DIY field conversion, it was simply an approval to rebuild the BC-12D as if the factory were building a new BC-12D-85. Jack Gilberti was the engineer at Taylorcraft who "designed" the "85" back in 1948. To the best of my knowledge, after a LOT of head scratching and detective work, I suspect Jack took the factory production BC-12D-85 upgrade drawings and got the CAA to approve it as an STC. So when you have a flying, intact BC-12D and want to do the (Gilberti/Harer/Bowden) conversion, you have to take apart more of the airplane than you would have if they had designed a real "field upgrade" conversion.
If you are restoring a Taylorcraft and have it all apart, or buy a basket case and take it apart, the conversion adds less than a day to the whole process.
I have no idea if the FAA/EAA/AOPA negotiations on weight increase would ever be successful or not. I hope they do of course. But another key point is that doing the 1500 pound/full electric "F-19" conversion on the T-craft makes the airplane fly less like a sportscar and more like a tractor.
If you want to come up with the "best of the best" for a back country T-craft, start with a pre-war airplane, and do the STC conversion for 85HP, find a C-85-8 or C-90-8, and choose "option 1" of the STC... this leaves the original engine mount, and yields a 1250 or 1280 pound gross weight, on an airplane whose empty weight can be kept to 750 pounds. Mine was 776 pounds, but with a metal prop, -12 rear case, an Airtex interior, and the steel tailspring.