Talking about heavy cowls I bought one of the 40 sized Pheonix Sukhois last month and after I got it home I noticed how heavy the cowling was. 4 Onces to be exact! But I can't keep it off because a suk wouldn't be a Suk without that huge round cowl on the front end. I'll just add more motor than I normally would. For comparison the cowl on my UCD 60 was under 2 ounces. And the UCD is a much larger bird than the Suk.