FW207, surely with a govenor and fuel controller fitted, the Nr would remain the same. (N2 = 100% and N1 altered to maintain constant Nr, unless of course the N2 govenor goes haywire)
Although as the air content was replaced with CO2, wouldn't the T4 soar, as the flame wouldn't be cooled as easily?
If we emptied the box and instead of the Jetranger and pilot placed in it an electric hot plate and a pot containing 1 litre of water. As the water reached and maintained boiling point, would the weight of the box plus contents remain the same?