T28D,
And a well known citizen of NSW has one, what an unholy noise it makes.
Just as well the glider exemption ( on the basis that gliders don't have an engine) against the post -1983 (or thereabouts) noise certification standards, applies.
If some of the noise could be converted to thrust, that very unspectacular self-launching performance would be greatly enhanced. Brought back memories of the original non-fan B707 and DC-8. May not have been 120+ pndb, but "sounded" like it!!
Tootle pip!!