DynaRig MotorSailer, ala Maltese Falcon

[Landlubber]

Pericles, no wonder women do not understand men, I would have been a pirate in another life, it really must have been a very adventurous time sailing around plundering wealth merchants. Today all we are allowed to do is go sailing still, but those times also will be limited if the dogooders have their ways, we would have to be licenced to go to sea, must have the manning, even if we want to sail solo or limited, have to wear hard hats, steel capped boots etc etc, "if it only saves one life"....oh please, let me go free.........

She is truely a woonderful little ship... great that someone would think outside the square, but put the money on the table too....that is the hard part.

[Pericles]

Become a private contractor and apply for Letters of Marque from Congress.

http://en.wikipedia.org/wiki/Letter_of_marque

Pericles

[SeaSpark]

Sorry Pericles, can't find the "Dynarig not for sloop" article either. There have been at least three multiple page articles about Maltese Falcon in Yachting World and have got only one at home. I'm pretty, sure it was in YW but i can be wrong, i read a lot of magazines and many of them featured MF the past Year.

I will try to find it.

[Tad]

http://www.hiswasymposium.com/symposium_papers.asp

Included is the best paper on the Dyna rig application, see 2004 papers.

JD explains that esthetics played a large part in rig geometry for Maltese Falcon. But in the context of an 87 meter vessel, certainly a single un-stayed mast version would not be sensible.

Tad

[yipster]

found Tads good link and this balanced rig while thinking and searching
how a (up to 40% better sailing) aerorig may work in bi or A masts

[BigCat]

From http://www.dunnanddunnrealtors.com/Catamaran.html

[brian eiland]

Originally Posted by Tad

http://www.hiswasymposium.com/symposium_papers.asp

Included is the best paper on the Dyna rig application, see 2004 papers.

Thanks Tad, I had missed seeing this paper...probably as I only had a cursory interest at that time

[brian eiland]

Just months after beginning the construction of a Sunreef 102 Double Decker, Poland's Sunreef Yachts has received an order for a 32m (106ft) multihull based on the exterior lines of the Sunreef 100.

The new Sunreef 106 Sailing is being built for a European client, and its modern interior is the result of close cooperation between the Sunreef in-house design team and the yacht's new owner.

''We've been receiving many inquiries for large custom yachts which is gratifying and supports our strategy to build these kind of boats," says Sunreef VP Nicolas Lapp. ''With our first two superyachts due to be launched in the coming years, we have now achieved our goal to be recognised as a builder of large custom yachts that only happen to be multihulls."

Headquartered in Gdansk, Poland, Sunreef Yachts specialises in luxury sailing catamarans and claims to be the first and only shipyard in the world to have under construction two multihulls over 30m (100ft). The company also builds monohulls and power catamarans, including the Sunreef 67 Power, which is due to be launched in April 2008.
(1 April 2008)

...I knew I needed some exposure in Europe, Brian

[brian eiland]

http://www.youtube.com/watch?v=xJBzk5b3b7o

[schakel]

Originally Posted by yipster

as Brian sayd
i like that motorsailer and thanks for the link
think its even in relation with beetle above

Ha, Fun to joke when it comes to littelary translated dutch translations but to get to your design;

Is that a skysail (a kite like the kite surfers?) kind of thing you were planning in your sketch. Great but the yacht is so heavy it benifits only a little when it comes to the uplift effect of a kite.

http://www.youtube.com/watch?v=FP0x7naNZ0A

[brian eiland]

Originally Posted by schakel

Is that a skysail (a kite like the kite surfers?) kind of thing you were planning in your sketch. Great but the yacht is so heavy it benifits only a little when it comes to the uplift effect of a kite.

That sketch was just at the point of launching the kite, not for lifting.

....more here
New Age Trawler/Motorsailer; Kite assisted PowerYacht

[dskira]

Originally Posted by brian eiland

I recently wrote with regards to an inquiry about a 40-ish version:

Unlike my 'single-masted ketch' design that I feel is not necessarily appropriate for a vessel of less than 45 feet, the DynaRig is appropriate for this smaller size vessel. In fact a ‘3-panel’ dynarig might be considered rather than the 4 panels of my new 63 foot DynaRig cat design, or the 5 panels of Falcon. However, I would still favor the 4 panel configuration, as it offers more variation in reef-able sail areas. And with my simplified sail furling mechanisms, it doesn’t add that much weight or complication to the overall rig.

Falcon’s dynarig was complicated by requiring the sails to be furled up inside the mast thru a hollow slot on one side;
1) the mast itself needed a slot in itself all the way down one side of the already weaker side of an elliptical cross-section. This necessitated an internal structure be built into the carbon mast section to reinforce it at the slot area

2) the furling mechanism then needed to be built inside the mast section, and a complicated track mechanism was required to guide the edges of the sails out onto the bridges to the yardarms & the yardarms themselves



I am proposing a much simpler furling and track mechanism for this modern square-rigger concept:
1) The mast will not have internal stowage of the sails, so no slot is required, nor internal support structure. It will be a simple elliptical section that will taper at either end to a smaller section at the top and a circular section at the bottom….not that much more complicated than an ordinary carbon mast for a sloop rigged vessel with a mainsail attached. It might also be a ‘sealed unit’ for ultimate flotation purposes.

2) Each rectangular sail will furl around a ‘wire’ (PBO, Kevlar, Spectra, carbon, etc) sewn across its mid-girth, and having eyes at both ends that clevis pin into ‘continuous line furling drums’ as you might find on ‘Code’ type reaching sails. The sails are constructed of low-tech, light-weight ordinary Dacron, and are of such relatively small dimensions that when furled around a very small diameter ‘wire’, they present a very small diameter package to the elements when ‘stowed away’. Each individual sail panel can be quickly and easily replaced, and inexpensively as well.

3) The furling drums are incorporated into the leading edges of the yardarms/bridges so as to present less windage, and they are’ stacked’ up vertically end to end in a line such that they ‘share’ bearings at either end. One small electric motor drives each panel for furling. For each panel of sail there are two (top & bottom) additional motors to unfurl the sail.

4) The yardarm ‘bridges’ can be shorter in length than Falcon’s with many inherent advantages including the more readily usable ‘forestay arrangement’ with or without a ‘code’ type reaching sail. Shorter lever arms requires less power to rotate the rig as a whole.

5) Three of the yardarms are of equal length thus less production cost…in fact probably these three would be only slightly more expensive than the elaborate furling/stowing booms now found on many ‘ordinary’, modern, short-handed sloop rigs.

6) The low-tech, Dacron sails of this rig should present some considerable savings over those modern sails for Bermudan rigs, and help offset the other initial extra cost of the Dynarig.

7) The sealed mast and yardarms could offer the flotation for the ultimate non-capsizing protection.

These proposed changes to the original Falcon’s interpretation of the DynaRig concept should result in a less expensive version, which is just as viable in sailing characteristics as the Maltese Falcon is proving to be.

Did you do a cost estimate compere to a more classical rig?
Cost is often the difference between possible and impossible.
The MF was possible because a large amount on money was pouring in without restrain. It is not a viable model for any boat.
But if your simplified the rig to a cost at the same level as a, let say, a full batened classic multihull rig, why not? And they are not cheap.
Cheers
Daniel

[brian eiland]

Originally Posted by OldYachtie

Gosh, you could haul it aft a bit, and add control sheets to the spars. Oh, wait a minute, then it would be a junk rig. Well, since we went that far, why not put unstayed masts in each hull, and have a bi-plane junk rig. That would have many advantages from an engineering and sailing point of view.

That is what this fellow is proposing, a bi-plane version:
http://www.boatdesign.net/forums/sailboats/square-rig-variation-30031.html

[brian eiland]

Originally Posted by dskira

Did you do a cost estimate compere to a more classical rig?
Cost is often the difference between possible and impossible.
The MF was possible because a large amount on money was pouring in without restrain. It is not a viable model for any boat.
But if your simplified the rig to a cost at the same level as a, let say, a full batened classic multihull rig, why not? And they are not cheap.
Cheers
Daniel

I did no cost comparison as I had no final alternative configuration yet. But this other subject thread has me thinking about a 'bare bones' version....buildable in back yard. Started writing and sketching a bit yesterday, but now headed to Florida to visit an old friend for a week. So probably won't finish that until I return.

[richard sauter]

DynaRig sounds impressive, but a sail by any other name is not much of a sail if it doesn't function as a well designed wing. When it comes to determining the best sail design there are no uncharted waters. It has been proven time and again that nothing beats a Wing sail.

Why venture past chartered waters when what you seek is staring you in the face?