ORIGINAL: pilott28
ORIGINAL: SinCityJets
Hmmm, I couldn't find it either. I must be ahead of my time...
I am reaching back, but I believe in early times, there was a 1 to 1 thrust to weight ratio rule applied to all turbine aircraft under 55 pounds that was eventually replaced by the 200 mph rule. I'm sure someone here will remember. This was just prior to the effort to put speed limiters on all turbine aircraft that fortunately never made it past the EC.
As I remember the original rule stated "....thrust cannot exceed .9 to 1" before the 200mph limit was made.
I for one am glad to hear the rule changes. My personal thanks to Keith and all those who have worked on these changes. It allows for more creativity in the larger model arena.
My scratch built B-1B project is running about 48 lbs dry with two 20 lb thrust turbines. With all the fuel that will be needed it would have weighed over 55 lbs wet and would then fall into the Experimental category, even with the designed .6 to 1 thrust. Now I feel much more comfortable with the new weight limits and not have to back off on a safe fuel load to get it under the old limits. At least I have built it under the Experimental rules so it has a lot of redundancy and falls within their specs for calculating servo loads. This is going to be a good year.
Roy