Bad news on the Radial Beaver. I spoke with Horizon after I could not get the Beaver off the ground during the picnic and was told that the 35 cc will not work for it. I need to get the 77cc size. I purchased the plane and motor at the same time last February and I was told that the 35cc is good for it and will fit the cowl and will fly. Now they say it was an error. They are willing to take back the 35cc at a restock fee of 15% and then I'll have to buy the 77cc. That $179.00 down the drain but its better than loosing out and ending up with a perfect working 35cc radial that I can't use. Update soon.