Two new engines may shift this paradigm.

The Syssa SAP-180HP is now shipping, is made in CT, weighs around 40 oz including muffler/ignition, and the numbers appear to beat a YS 1.40 and is just about equal to an OS 1.60. It is setup in-line, with a rear-mounted carb. It is quiet at 91 dBa too. $429, rtf. Beautiful engine! http://www.syssaaircraft.com/cart/pc...&idcategory=11

The other is the DL-30. 38 oz RTF, looks pretty impressive on an APC 18x8W prop (8900 rpm). Unfortunately is has a funny side-mounted carb that would make mounting difficult (reed valve crank case side induction). Made in China. $319 shipped. http://www.valleyviewrc.com/DLE-30cc%20gas%20engine.htm

I would be interested to see what they will do with a "pattern" prop like the 18.1x12 used on some larger engines. These numbers are using the included mufflers, of course we could expect a power increase and drop in the noise using a large pipe like the ES Composites. Also with gas we could get away with using a 7 oz fuel tank instead of the larger nitro tanks, so some savings in weight could be had.