I've heard so many reports that support both ideas and I am in a quandary now. My latest project is a 90-100 sized Extra 300, it will be about 7 1/2 - 8 pounds soaking wet, and power is a Saito 150. It fits so nicely inverted, but the last time I tried this, nothing but problems. Are there any tricks I don't know about? How about starting the plane upside down? (Biggest problem last time)Talk to me.