Measuring the Moody 44 rig…

The rig dimension list is helpful in determining the boat’s approximate sail area.  Once you have determined your sail area, the figures can be used to calculate the loads generated by the sails for any given wind velocity.  The loading calculations are essential to selecting gear with adequate strength for its intended application.

  • Mainsail = (P x E) / 1.8 (1.6 for racing profile mainsails)
  • 155% Genoa = (( J x I ) / 2) x 1.65
  • 135% Genoa = (( J x I ) / 2) x 1.44
  • 100% Jib = ( I x J ) / 2
  • Racing Symmetrical Spinnaker = 1.8 x J x I
  • Racing Asymmetrical Spinnaker = 1.8 x J x I
  • Cruising Asymmetrical Spinnaker = 1.65 x J x I
  • I” is measured along the front of mast from the genoa halyard to the main deck. The main deck is where the deck would be if there were no deckhouse (the sheerline)
  • J” is the base of the foretriangle measured along the deck from the headstay pin to the front of the mast.
  • P” is the luff length of the mainsail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted or black band.
  • E” is the foot length of the mainsail, measured along the boom from the aft face of the mast to the outermost point on the boom to which the main can be pulled or to the black band.
  • JSP” is the length of the spinnaker pole or the distance from the forward end of the bowsprit (fully extended) to the front face of the mast.
  • ISP” is measured from the highest spinnaker halyard to the main deck. The main deck is where the deck would be if there were no deckhouse (the sheerline)
  • PY” and “EY” are, respectively the luff length and foot length of the mizzen of a yawl or ketch measured in the same way as for the mainsail.
  • IY” is the measurement from the staysail halyard to the deck.
  • JY” is the measurement from the staysail stay to the front face of the mast.
  • LP” is the shortest distance between the clew and the luff of the genoa.
Comparing the measurements to the Moody 44 – “Enterprise”

  • Mainsail = (P x E) / 1.8 = 37.55m² —> actual sail = 33.85m²
  • 155% Genoa = (( J x I ) / 2) x 1.65 = 69.11m² —> actual sail = 58.59m²
  • 135% Genoa = (( J x I ) / 2) x 1.44 = 60.31m² —> actual sail = 58.59m²
  • 100% Jib = ( I x J ) / 2 = 41.88m²  —> I don’t have one
  • Cruising Chute = 1.65 x J x I = 138.22m² —> actual sail = 115.013m²
Moody 44 Rig Dimensions:

I = 16.49m = 54’0″

J = 5.08m = 16’8″

P = 14.17m = 46’6″

E = 4.77m = 15’8″

ISP = 16.49m = 54’0″

JSP = 5.08m = 16’8″

Actual Sail Areas on Enterprise:

Roller Genoa = 58.59m² = 630 sq ft

In-Mast Furling Main Sail = 33.85m² = 364 sq ft

Cruising Chute = 115.013m² = 1,238 sq ft

You can use Sailpower Calc – Which is an online calculator that works out the sail areas, forces and moments, when given the rig measurements and wind conditions. It represents, in a simplified manner, the aerodynamic module of a VPP (Velocity Prediction Program), used to predict a sailboat’s performance. Its quite interesting to see the effects on loads for wind speeds from 4 kts to 25 kts to 40 kts….especially when you use / don’t use the “auto depower” setting.


Staysail, storm jib, storm trisail, and inner forestay

Using an inner forestay provides an effective means to set a storm jib and bring the sail force in-board, closer to the boat’s centre of effort.  It can also be used to add a staysail incresaing sail area on reaches and runs, to complement a cruising chute or a large genoa for example.

Stay sail on a run Unfortunately the Moody 44 does not have a cutter rig and an inner forestay would have to be retro-fitted.

The trouble with a retro-fit is that the existing rigging is not set up to take the pressure of a stay on an unsupported area of the mast, and requires the addition of running backstays to provide the necessary support.

Enterprise already has a removable inner forestay – a Solent Stay – which is attached to a re-inforced pad eye using a Highfield lever. This is an inner-forestay variation where the inner-stay is attached to the mast very near the main forestay fitting.  In this arrangement the existing backstay provides the support for both the main and inner forestays, eliminating the need for runners.

I can use the existing genoa track and cars to sheet the stay sail for a reach or for running, but the stay sail is not easily sheeted in for close hauled sailing. Well you cant have everything.

I will also add a storm jib and a storm tri-sail to my sail wardrobe. Fortunately the Moody 44 does come with a track on the mast for hoisting a storm tri-sail.

Opinions vary about the need for a storm tri-sail. ”Of course, some boats will sail just fine with only a storm jib set, especially boats with long keels and balanced sailplans. The old cruisers that had keels that ran the length of the underbody, although slow and cumbersome, were very seakindly. The long keels gave them directional stability that even an unbalanced sailplan, i.e., too much sail forward or aft, could not mess with. On the other hand, many fin-keel boats without much underwater shape will suffer without both an effective storm jib and trysail set at the same time, since there is not enough lateral stability under the boat to help it ride the waves. The result is that the sails end up dictating how the boat will lie relative to the seaway. Therefore, setting only a storm jib without the trysail to counterbalance the sailplan would make it very difficult to keep the boat on a steady course…” (

I must admit that the thought of having to use the storm tri-sail means is worrying in itself, we would be probably in “survival mode” not just heavy weather sailing! The Moody 44 has in mast furling rather than a slab reefed sail which could be taken down to its 3rd reef. I would not really like any of the in mast furled main sail showing in 40/50+knots of wind, the same as with a roller furled genoa. I think you would want all furling mechanisms locked down tight. The International Offshore Racing Rules state that the area of the trysail should not exceed 0.175 x P (mainsail luff) x E (mainsail foot). That is roughly 20 – 30% of the main sail area,  but I think I would rather go for something at the smaller end of that range.

StormTrysail StormJib

It is also worth noting that you don’t just set the storm tri-sail on the boom. ”…Like the storm jib, the trysail should be set with its own sheets permanently attached at the clew. It’s important to note that these sheets should be run to a reinforced pad eye on deck or a snatch block on the rail, as opposed to the boom, which should be secured to the deck…” (

Plenty to think about here!.

Upgrades / or nice to haves ?

Like many new owners the list of jobs that I want to do to "Enterprise" is too extensive for my pocket!

But, you have to have a list…from that you can prioritise and sift and sort until the essential jobs are identified and completed.

New sail plan cutter I have the added anxiety of planning for the dream of a circumnavigation – or at least an Atlantic crossing. In a way this makes identifying what is essential a bit easier than if I was just going to continue fair weather sailing and cruising around the British Isles. Its the realisation that forces and wear and tear on the boat will not only be greater, but there is no hope of getting any breakages fixed by pulling into a port.

First, the boat must be ocean seaworthy.

Accordingly, I have put the following right at the top of my list:

    o standing rigging
    o running rigging
    o sail wardrobe
    o rudder(bearings; steering)
    o keel (bolts; keel / hull seal)
    o seacocks




Its not that any of the above are causing me some urgent concern – the boat was surveyed and found to be in seaworthy condition on all the above counts.  But, I must know in my heart that I have examined each of the above in the light of a 30 day non-stop voyage, with at least one ocean storm as the ultimate “boat surveyor”.

I feel I must iron out all the friction in the “easy to use”  Furlex and Selden in-mast furling system – which MUST not jam. I must look at all the chaff points and think through how the running rigging and sails will survive 30 days of continuous use. I must  look at the mechanics of hoisting sails and putting them away at speed while effectively short handed or even single handed on this 44ft boat.

A rose by any other name would smell as sweet…

Boat name

Boat name

Jaz and I decided  we would rename “Kolfinna” to “Enterprise” in a way its a tribute to our previous boat “Enterprise” that had looked after us so well for 8 years and also because we liked the hilarity the name caused whenever we radioed a French marina – back would come the reply …”aah…beam me up Scotty…” followed by much laughter. believe me it takes a lot to get French marina staff to laugh!

The real problem with boat name changes is the bureaucracy of corresponding with the Lloyds Registry of shipping to enable this. You are allowed alternative names and you can chose from a list of authorised ports – but you cannot duplicate an existing registration. All that seems sensible, but you are not allowed to look up the existing registrations, so it is pot luck when you choose a name as straight forward as “Enterprise” whether or not you will be allowed it. Plymouth was our “chosen port” since we bought “Kolfinna” there and the boat was actually built there by Marine Projects Ltd.

As luck would have it we hit on a unique boat name that had not been registered in the port of Plymouth – obviously there are no Star Trek fans in Plymouth 🙂

Now all we have to do is change the details on the EPIRB registry, the CG66 registry ….oh, and most important, we must placate Neptune with a naming ceremony!

Thanks to John Vigor for his denaming ceremony 🙂