J, I am confident that Horizon will take care of an engine that is not right. I love my 9-90 (99). It is so smooth and cool sounding. If you have read the whole thread, you will have seen that mine has well over 100 flights. Also I am pleased with the XOAR 24x12 black warbird style prop and I use a 20 ounce tank. I look forward to updates on your Stearman as well as Badangle's. Yes you are correct, I must join that scale site. Thank you for informing me of it.
-Tom