ORIGINAL: Silent-AV8R
I know I'll regret asking this, but what does the 5kg have to do with the size? If you kept the 2x2 limit and allowed say 5.5kg max weight and had all planes weighed ready to fly. What horrors would happen??
To me, 5 kilos is a fairly safe target for a 2x2m size, either wet powered or e-powered, for many current models. Don't need exotic construction materials either; the Vanquish makes weight easily and that's a balsa, foam, ply plane that's within almost everyone's budget
I don't have that much of a problem with 5.5 kilos. However, I'd expect a bump in cost due to more weight latitude for bipes. These will likely cost more. It just might be the thing that drives Pattern to extinction because everyone would falsely believe that they must fly a bipe to compete, and they are just not gonna spend that kind of money for a plane
The question about 5.5 kilos is fair. It has current precedent too. Consider a YS powered model carrying around 20 ozs of 25-30%. Weight empty is 5.0 kilos, except, with fuel, it's pretty darned close to 5.5 kilos at takeoff....... If the rule was drafted such that all models were to be weighed fueled and RTF, then maybe, just maybe, there would be minimal impact
The answer is convoluted