Gary, I got to agree. You don't want your hog screaming through the air like a mad bumble bee, but grunting along with a nice grunt, or rumble of a 4 stroke.

I've not owned a hog, but a couple of them have show up at the field. Seems a 90's size4 stroke ws the choice if I remember correctly. One was an O.S. the other a Y S if I'm correct. I have a Great Planes Super Aeromaster built per the plans that is almost 10 lbs, and I have a Magnum 91 four stroke itn it. I've yet to fly it though.

Don