Ex Para-
'that a 747-400 was on short finals and it turned out to be a Bell 505 JetRanger!!!'
Reckon, the 'Problem' right there was/is the Allison C-20 engine contained therein......
now known as the Rolls-Royce M250, (US military designations T63 and T703)
- Bull-****e, Rolls did 'not' make it!!!! and it does have years on 'it'.......
ex Wikipedia:
Design and Development-
In 1958, the
Detroit Diesel Allison division of General Motors was chosen by the US Army to develop a new light turbine engine.........
Takes along time for 'it', to arrive and 'it' wont lift/do much at All for you, if 'one' does the temp/pressure density- performance on it, out here.......
Anyhoo- best go now...... (ohh- there is the C-30 in the LongRanger, but Not relevant to the point/discussion....)
Ta/Rgds all
S28- BE