Yep - not been out this year yet - but plan to on Saturday (after I have looked at the tides) .
It is case of ignore tables, almanacs and charts..... just stick between the bouys, take it slow with the engine trimmed up and watch the sounder like a hawk.
A foot of water under the prop and I feel happy ! I don't even try 2 hours either side of low water.
If your going to launch at Christchurch on sat for sure let me know & if its OK weather I'll bring the rib down ( was planning to anyway) .
Low water neaps you 'might' get away with it ...you might not .
Locals accept you are going to ding the prop about once a year ( it can get expensive with SS props) . Once inside its all sand/ mud , but the channel up to the harbour entrance is stony
Once in the harbour - stay inside the channel - venture out only at high water and with the engine trimmed up.
Having said all that it sounds evil - but I love it and once youv'e done it a few times its a nice place to go
JUst checked tides - reckon you'd be OK from about 7.30am to 3.45pm this coming Sat 13th