Explanation for the Increase in Multihull Popularity

[Lagoon4us]

Nice old Carvel motor boats here in Australia are often equipped with sails both for steadying and to assist with motivation......

[Lagoon4us]

Now there ya go .... look at CF's banner at top of page......mmmmmm popular!!!!!!!!

[justwaiting]

Originally Posted by Lagoon4us

Now there ya go .... look at CF's banner at top of page......mmmmmm popular!!!!!!!!

Now we have been shown the real answer, it multi hulls being promoted by CF

[dirkdig]

It seems to me the comparison to housing has a bit to do with it, not too many aspire to live in a basement with a deck to come out to now and then when he weather allows.
The aspect and comfort can not be beaten.

[Tomahawk]

Originally Posted by boatman61

These are faster....
this is yacht racing - YouTube

Impressive boats but a bit like comparing a Lexus or Merc to a Dakar or F1??? A Volvo 70 has the same power to weight ratio as a Sidney harbour skiff but is over 5 times longer... and faster..

To be fair I love the sight of a mono as I see them from behind.. then alongside then from ahead..

[smj]

Originally Posted by Lagoon4us

Different strokes for different folks,,,,,,What's the problem smj ?

If you would read my entire post you would realize I don't have a problem with his boat. I was making a point.

[smj]

Originally Posted by markpierce

So? Your opinion means nothing to me as it's apparent you know not what you speak.

You to need to read my post. Must have hit a nerve?

[Lagoon4us]

I thought i did read your post in entirety, initially i saw your comment as criticising his choice in boats, up to that point i agreed with you?
It's more how you structured your response after reading it the 4th time i get your drift Cheers....

[Sand crab]

Originally Posted by Lagoon4us

Now there ya go .... look at CF's banner at top of page......mmmmmm popular!!!!!!!!

You Bastards.

[Highland Fling]

OH MY a Multihull owner who can be honest about his boats performance and Australian too with a Seawind 1160

We have found that with our engines on we do pretty well to windward, notwithstanding the reputation of catamarans going into the breeze. As we have mentioned before we generally use only one engine in such conditions, as we rarely use both when under way. (We only gain 15% of speed, but use 100% more fuel with two!).



We can generally sail upwind at an angle of about 25° to the wind when motor-sailing and we do about 5-6 knots to windward with any breeze above 10-15 knots. We have to add about another 7-10° for leeway (the amount that the boat slips sideways in the water) so when we tack from one tack to the other we usually turn about 65-70° which is about what the big super racing yachts can manage for their tacking angle.



Of course without the engines we would have an angle to the wind of about 35°, and our speed in 15 knots of wind would be around 4 knots (5 or more at 40°) and at this speed the mini-keels don’t grip as well and we slip sideways more which has the effect of increasing the overall angle we are really moving at when measured on the GPS - so all up we would have a tacking angle of about 100° (50° each side made up of 40° of our heading, plus another 10° for leeway).



The net effect of this, if you apply that trigonometry you had to learn in high school, the net useful speed made directly upwind (called the “Velocity Made Good” to the wind) is made up using the following equation:

1. -VMG = cos(angle to the wind) x boat speed
   
2. -Without the motor = cos(50°)x 5kt = 64% of 5kt = 3.2k
   
3. -with the motor this = cos(35°) x 6kt = 82% of 6kt = 4.9kt or more than 50% faster getting to where we’re going, and the effect is even greater in light winds of course.
   

In fact, we noticed coming down the west coast that we were more than competitive with the monohulls when going to windward, as many of the cruising monos also used an engine going to windward, and even so we would usually beat them except for a couple of the larger boats which were significantly longer than us, who we would not expect to catch in any conditions.



The take home message is that when cruising to windward, there is more use of motors than we had originally thought - not because we can’t get there without it, but because it actually works quite well and is generally much more comfortable than banging straight into a headwind. When coupled with the need to make electricity and water - this further justifies the use of motors in such conditions.

Day 289 - VMG upwind to the Tamar River

[deckofficer]

Good write up David, put me right back in school.

[downunder]

Highland Fling you make some good points re boards/minikeels and use of motors.

I have heard comment regarding wether to spend the money on boards or not that in reality not used very often when crusing. If need to make way to windward start a motor. Many vessels both mono and cat use this technique.

Shuttleworth has done studies and suggests for cruising cat only one board can be justified.

Cheers

[Highland Fling]

Originally Posted by downunder

Highland Fling you make some good points re boards/minikeels and use of motors.

I have heard comment regarding wether to spend the money on boards or not that in reality not used very often when crusing. If need to make way to windward start a motor. Many vessels both mono and cat use this technique.

Shuttleworth has done studies and suggests for cruising cat only one board can be justified.

Cheers

HUMMMMMMMMMMM that is / these are NOT my words but a part of a blog of an Ausie cat owner on his way round (circumnavigating) ausieland i did add/include the link to his blog/website

[Lagoon4us]

Originally Posted by Highland Fling

HUMMMMMMMMMMM that is / these are NOT my words but a part of a blog of an Ausie cat owner on his way round (circumnavigating) ausieland i did add/include the link to his blog/website

Damn i was waiting for the penny to drop..... LMAO

Cheers

[downunder]

Originally Posted by Highland Fling

HUMMMMMMMMMMM that is / these are NOT my words but a part of a blog of an Ausie cat owner on his way round (circumnavigating) ausieland i did add/include the link to his blog/website

I did assume they were points you supported.