420 Boat Speed?

David:

Congrats on your 420, that is one fantastic yacht. As Google tells us, you can calculate your hull speed as such:

How to calculate hull speed?
As a very general rule the maximum speed of any displacement hull--commonly called its hull speed--is governed by a simple formula: hull speed in knots equals 1.34 times the square root of the waterline length in feet (HS = 1.34 x ?LWL).



The waterline is sq. root of 37.333 feet = 6.11 x 1.34 = 8.18 is the IP 420 Hull Speed.

Now, on your trip to Key West, please take some photos and show us these speeds. We are counting on that

Hayden

David:

Thank you for the info, I will check it out. I also have looked at Fiverr for the same work. Your logo is great, well worth the money.
Hayden

Got it. Well, I will say that once you have winds of 15 knots, you will be at hull speed most of the time unless the sea state is high, say 3-5 feet and short say 4-6 seconds. Otherwise, under 15 knots, I would say 5-6 knots. and then when down to 5-10 knots, you will be doing 3-5 knots.

The game with passage making like this is to use an average of 6 knots for the leg, then estimate your time. Once underway, you can easily slow down at the other wend to arrive in favorable light conditions.

We use opencpn.org/ charting software on laptops and we create a route with that, then in the route planning, we can enter various speeds. It will then tell us the time it will take to run the route at that given speed. For our IP35 we use a lot of 5.5-speed planning. It has worked out well.

PS:
If you do not have opencpn.org/ then you really should look into this FREE tool. It is fantastic!

Hayden

David:

Thank you very much. I really appreciate your kind words. Island Packet Yachts is a lifetime joy for me. Started in 1986 chartering the IP38 for a month on the Chesapeake Bay. Then 1991-2001 IP27 Cinnamon sailed every creek in the entire Chesapeake Bay. 2001-2011 IP35 Island Spirit sailing out of Rock Hall, MD and going north every summer for 2 months. Then in 2011 retired, moved onboard IP35 Island Spirit and started cruising. Five trips Maine to Key West and 6 winters in the Bahamas, we finally pushed the Thorny Path Florida to the BVIs. We have sailed on several IPs 40 and 45s MD to Bermuda and we simply LOVE the way these boats sail offshore. They are solid, safe and fast. Many say they are dogs to sail, but we have never found that to be true. I raced on a J-35 team for 8 years and I would have bought a J-120, but Radeen wanted a boat we could not race and one that was comfortable. There you go, what every you want we will get, let's just go sailing, and so we did. The IP 27 was the start.

I am very happy for you with your boat, she will teach you a lot about everything. Enjoy the adventures. There is no better life.

To show you why I like IPs offshore, check out my two best sailing videos here:





That says it all.

Hayden