Strangely, the F27 twin Darts were far noisier than the Argosy's four. I can't recollect if Viscounts flew into Invercargill, but you couldn't mistake the sound difference between the Friendship and Argosy. I had several F27 flights, but only one Viscount flight (Wn - Dn*, 1968, the onward flight to In was supposed to have been an F27, but lo and behold, there on the tarmac at Momona was a DC3, my final flight in one, surely right at the end of their NAC service).
That October day I returned from the Chathams (Te Hapupu) to Wellington Rongatai on BF170 RK (or LT), arrived Wellington after 3.5 hour flight and immediately after landing,** in very blustery conditions, the airport was closed except for 737s. A while later our Viscount flight to Dunedin/Momona took off okay, although I noted those long nascelles were jiggling up and down a bit too much for my liking. The flight was great, except for some rough air over Canterbury. On takeoff the Viscount passed over the wreck of the Wahine, which I caught a very brief glimpse of as we turned 180, heading south towards the Mainland.
**No one forwarned us poor pax about the 'slam one wheel firmly down first' technique used in crosswind landings, the BF 170 was a taildragger, with fixed gear.
If I'd gone to Chats in 1965, when orginally asked, I would have flown by RNZAF Sunderland........................................if only I'd gone then!