Dave, I have been reading these links with interest, as I currently have a kit of the Bonanza, and am considering the arrow. I have seen your T34 fly at the Mint Julip, and it flys well with the OS91 2cycle. My question is this: Having looked at the Tower hobbies web site for the OS 91, it says that the exhaust mounting dimensions are the same as for the 61 Fx. Couldn't you use the header and in cowl muffler for that engine that Top Flight makes, or would the back pressure be too much due to not enough volume? I like the way your birds fly, so I may use that engine in the Bonanza as well as the Arrow if I buy one( I probably will!) Just wondering if the in cowl muffler could work without reinventing the wheel, so to speak. Maybe there could be a mod made to the muffler for back pressure?
Thanks,
Bryan