As has been said in other posts, I agree that your time frame is seriously optimistic. Here's why.
I "delivered" my boat from San Deigo to New Zealand. We left SD on 6 June, we stopped in the Marquesas (4 days), Bali (5 days) and Raratonga (4 days). We stopped because:
- Marquesas - we had been at sea for 24 days and needed a break and maintenance.
- Bali - it was too beautiful to just sail past
- Raratonga - maintenance and we then still had 1600 miles home to Auckland
We arrived in NZ on 18th August. Total trip time 2 and a half months. Stopped time 13 days. Total distance 6000nm (approx)
Now consider your trip.
You are leaving the Med in May, crossing the Atlantic, weaving your way through the Carribean, transit through Panama, then basically the same trip we did across the Pacific but further. And then
on from NZ to Australia.
So approx 13000 miles (more than twice our distance), a canal transit (could be two weeks), probably three times the stops (more long distance voyages, more maintenance and rests needed) in addition to the canal transit.
And you want to be in Aus in September? Only 6 weeks longer than our trip?? I believe you're either setting yourself up for a bad hiding or you're going to take two months longer than you think.
You should consider something like Virtual Passage Planner to have a decent look at what you're up against in terms of weather, distance etc. It may cost a few dollars but it will give you a way better feel for your task. See it here:
Digital Wave - Products
There may also be a few free-ware downloads that will be useful.
Then go to Noonsite.com and have a look at the options you have for stopping along the route and get some up-to-date info on Panama. And know up front that no matter how good your boat is when you leave, you will have somethin to fix at the end of EVERY leg of your voyage.
Finally, it has been said on this forum and others that the one thing that has no place on a sailing boat is a schedule and definitely not a tight one. I have no idea what your constraints are but if you HAVE to get back for employment reasons or other drivers, be aware that you are in an environment that is often out of your control and forcing an issue at sea could end up getting you killed.
I can't recall ever completing a voyage in the time I comfortably
set for myself. I have no reason to believe that you will either.
If you do the trip your way, good luck. My advice is slow down and enjoy the trip - you may never get the chance to go back.