With the new rules, an 80 lb jet (that's wet weight) can have 85 lbs of thrust, BUT it must be inspected and certified under the AMA's Large Turbine Model Aircraft (LTMA) program.

Under the "normal" AMA rules, a jet with a maximum wet weight of 55 lbs can have a maximum of 50 lbs of thrust. That's for *all* installed engines, either one or two.

Previously, the single engine thrust limit for jets with a wet weight of 55 lbs or under was 45 lbs, and for twins it was 50 lbs. Thus, as I mentioned before, these 55 lbs (or less) planes with Jet P200's, Kingtech K-210's, Jet Central Mammoths, etc. were not in compliance with the rules. Now they are...

The rules for turbine jets 55 lbs and under (wet weight) are here: http://www.modelaircraft.org/files/510-a.pdf

and for the LTMA program are here: http://www.modelaircraft.org/files/520-a.pdf

Bob

ps. the 55 lb limit is in the AMA's National Model Aircraft Safety Code, to wit:

2. Model aircraft pilots will:
...
(e) Not exceed a takeoff weight, including fuel, of 55 pounds unless in compliance with the AMA Large Model Airplane program. (AMA Document 520-A.)
...