ORIGINAL: warhwk
I've owned four Chippies. A .91 four stroke is just perfect w/o overpowering the airframe. I am currently running a YS 1.20. Yup, too much of everything including weight. Saito .91 with a 15-6 will give you almost unlimited vertical.
Hey warhwk... I have a Goldberg Chippy with a Saito .91. I am however running a 14X8 but I'm not too happy with it. Just doesn't seem to have any"umph" to get it up. What kind of RPM's are you turning with a 15X6 on it? Is that an APC? or a MA K-Series?