ORIGINAL: BMatthews
If it was snappy before then it isn't going to be any better when repaired. An overly snappy model that surprises you with unwanted snaps strongly implies that the wing loading is too heavy. And all the repairs it's going to need are not going to help in that regard. If the plane was just plain vicous and it caught you off guard and snapped into the ground leaving you with a WTH look on your face then I think I'd suggest a nice warm bonfire with a ''good riddance'' glass of wine to toast its passing and move on to a better flying option. Really. We just can't fix ''heavy''.
What you're looking for is trigonomic tools. Lucky for you the Windows operating system comes with a Calculator program which has the trig functions in it. If you don't see the trig and other scientific functions then click on ''View'' and click on ''scientific''. To use it to find the offset dimension for a 5 inch firewall enter ''1'' then click on ''sin''. The resulting small value is then multiplied x5 to find the amount of set back to the right side for a 1 degree offset. As it happens it's .087 inch. Try it a few times to get familiar with the function.
While it was a bit snappy it is after all an aerobatic airplane
Like I said it never bit me unless I was stupid
. IIRC I think the all up weight was around 6 1/2 pounds. The rebuild is for the most part a scratch build so weight saving is fairly easy at this point. I've already eliminated some unneeded structure that was used in the ARF building process to make it easy to assemble the sub assemblies. I'll save a ton of weight in the wing by not having that huge box spar and 2X4 that held the wings together. Not to mention the 2 gallons of epoxy used in the wing joining process. The new wing will be a foam core sheeted and glassed. Stronger and lighter that the factory wing. I strongly believe the root cause of the demise was the elevators waving by-by at me on a high speed pass
. The cause of this was weak factory balsa push rods. I knew better but it was all I had at the time and I wanted to fly the darn thing. Hadn't flown a plane in 10 years and HAD to get in the air.
Thanks for the Windows trick. Oh, you miscalculated just a bit.... it's actually .087262032186417564097094892581581
And I can hold that tolerance with my wooden yard stick.........................
