Interesting chart regarding gas engine weights found in the "will Brison survive" thread in the gas engine forum. Doesn't just pertain to Brison engines, so it could be useful to all that want a 50cc engine.
It appears that the Brison 3.2, fully loaded, ends up lighter than a DA 50. The chart did not copy well to this forum so you may want to wander over to the Gas Engine Forum to take a look. Or just click the link below.
http://www.rcaerobats.net/GAS_ENGINE_WTS.htm
There may be some arguements about muffler weights, but the overall changes would not make much of a difference in the end, perhaps just match a few of the engines up in final weights.
I was surprised to see only a few 100's of an ounce difference between the DA 50 and the Taurus 52. The end price difference was quite surprising as well. Just goes to show ya how effective advertising can be. Those that spend the advertising dollar in a big way in the right places will be bought more often than those that don't. Unfortunately, the price of the product increases with the amount of advertising.
Pat