Comfort Index what's yours?

[dimdav]

Mirage 2700
(6000)/(0.65*(0.7*21+0.3*25.5)*9.5^1.333)

give a rating of 20.54

I now understand why a previous owner chose the name Filsket. For those not up to speed with the Shetland dialect it means frisky!

 

[westernman]

Comfort Index: 65

LOA: 51ft 4in (not counting bowsprit!)
LWL: 44ft 11in
Beam: 14ft
Displacement: 66,500 lbs

And we had 9.4 knots last week which I reckon is about as fast as we are ever going to go without surfing and without tides.

 

[Achillesheel]

Achilles 24:-

Disp: 2600 lbs
LWL: 19'
LOA: 24'
Beam: 7'

Result 14.58

Not sure if a high number or low is best?

Most Achilles owners would agree that the least comfortable aspect of the boat is its lack of headroom, just as well thats not one of the factors in this calculation.

 

[mihtjel]

Achilles 24:-

Disp: 2600 lbs
LWL: 19'
LOA: 24'
Beam: 7'

Result 84.42.

If I try the calculation given those numbers, I get 14.58 ...?

 

[Achillesheel]

Yeah, sorry, now edited.

 

[st599]

Mine is errr... 5!

So it clearly doesn't work for multihulls.

On a recent crossing of the Celtic Sea in winds up to 30+ knots true, we slept well, were relaxed, cooked and ate well. When we got in, other yachts that had been doing the same passage (it was a race) were full of tales of woe and how ghastly the conditions had been. We'd hardly noticed them, so I would rate our comfort index as considerably higher that J-120s, Starlight 46s, Dehler 39s, MAxi 1300s etc.

Comfort Index is how affected by a steep sea the boat is - not how comfortable it is for passengers.

 

[Boomshanka]

It's quite telling if you put your ex-girlfriends' vital statistics into that formula... different kind of comfort factor I guess... happy days!

 

[BAtoo]

First 310 = 16.1 !

 

[prv]

First 310 = 16.1 !

Are you sure?

Quite a few people seem to have got results like that when they slipped up in the arithmetic.

Pete

 

[AntarcticPilot]

Moody 31 Mk II = 24.6997705695896

But that's with the builder's idea of her displacement - I bet it's more with all the usual clutter aboard!

 

[robp]

Can I use USA pounds? It looks better!

 

[dunedin]

I also think the comfort index is inversely proportional to speed..

Hence my view of comfort for coastal cruising is different - with a faster boat I will be far more comfortable in harbour (or better in pub) hours before the so called "high comfort factor" boats

 

[TiggerToo]

Hence my view of comfort for coastal cruising is different - with a faster boat I will be far more comfortable in harbour (or better in pub) hours before the so called "high comfort factor" boats

don't go sailing in the first place, then

 

[gregcope]

Contessa 32

27.54 (was expecting higher)

Google docs;

=sum(9500/(0.65*(0.7*24+0.3*32)*9.5^1.333))

 

[grumpy_o_g]

Dragonfly - Comfort index=4

A large beam makes me very uncomfortable apparently.
The price I have to pay for being able to put down a full mug and it not spilling.

Try it folded then

 

[dunedin]

don't go sailing in the first place, then

On the contrary - a good sailing performance to me means more fun per mile and very rare resort to the engine

 

[DaveS]

Well I make my Etap 30 19.36, but I suspect its real displacement is a bit more so the number should really be bigger.

 

[Tanqueray]

As per the link to the US website, the general thrust of the (admttedly TIC) CI calculation is that, once you get into higher numbers you are blessed with great comfort but less speed (unless it's blowing a gale).

For a laugh then, try to guess the performance of the boat belonging to these dimensions;

Disp 371,840 Lbs.
Loa 135'
Lwl 87'
Beam 21'

Comfort Index?

 

[maxcampbell]

If it's really Kg, mine is 3.73, if pounds, 8.21. Is that good? Probably not. She is, in every way, an uncomfortable little ******; except the helm's always neutral, however it puffs, and she's got no vices that I've found yet. Small, is what she is.

 

[photodog]

1999 Bavaria 31. 19.75