New (Flatten) Batten Development

  Tags: , , , ,
  Comments: None

Dan Primrose from Primrose Fry Technologies shares an exclusive update of their ‘Flattens’ development with Rigging News:

For those who only have a few spare moments in the day, here is a quick
overview of the key points that have come out of the last two years of
development that Dan and Simon have done, that ultimately led to a J-111
in the USA, called “Spaceman Spiff” winning her class at Quantum Key West Race
week earlier this year, with a full set of Flattens in their
Light-Medium Jib. The feedback from the trimmers and sail makers on and
off the boat was nothing but extremely
positive and the Flattens had allowed them to trim the sail in ways that
were not possible with existing furling battens systems. The full story can of course be seen on previous posts here.

Here are some of the images from that week, from North Sails library:

J111 Spaceman Spiff with NS LM jib with full set of Flattens
J-111 “Spaceman Spiff” with NS L-M Jib with full set of Flattens

J-111 Spaceman Spiff with NS L-M jib with Flattens
J-111 “Spaceman Spiff” with NS L-M Jib with full set of Flattens
J-111 Spaceman Spiff with NS LM Jib with full set of Flattens
Close up of Lower Flatten on J-111 “Spaceman Spiff”
J-111 Spaceman Spiff with NS LM jib with full set of Flattens
Furled jib on J-111 “Spaceman Spiff” with full set of Flattens



  

Up until Key West, most of the work done was on J-111’s and J-109’s in
the UK, where the unique design of the sail pocket allows the Flattens
to be simply retrofitted to any appropriate sail. 

Furled Flattens (© 2014 Primrose Fry Technologies)
2 off 1000mm Furled Flattens

When Simon and Dan started this project, they were pretty sure that the
furling ability of the product would be good, but were not 100% sure
about the sailing performance. However, these doubts were very quickly
dismissed when images of the J111 sail were compared to the original
design files, and showed to be “almost spot on”.

So here are some images that we can show, that will hopefully show why PFT’s
confidence level is so high. Most of the testing that has been done has
been in lighter winds, which as anyone who has used a furling batten
knows, is the hardest conditions to get them to work as they should
(i.e. produce a tight furl whilst still giving the correct profile for
the flying sail). Testing has of course been done in all conditions up
to near gale force and were all very successful; “the Flattens were faultless and very good value
to quote the owner of the boat that was racing, shorthanded, offshore.
In these extremes of conditions, the simple fact that the Flattens are “stable” in both sailing and furled forms, makes them unique and will give the end user the advantage they are looking for.


© 2014 Primrose Fry Technologies Limited
J-111 Code 3.5 Jib Furled with Full set of Flattens
© 2014 Primrose Fry Technologies Limited
J-111 Code 3.5 jib Upwind with Full set of Flattens in 9kn TWS

This sequence of images were taken in early 2012. They clearly show the sail shape, both furled and unfurled.

Here is a clip, again from the J-111, sailing and furling with a full set of Flattens in about 9 knots TWS.


As mentioned, Dan & Simon have also been developing the Flattens for In Mast furling. This testing is still on-going whilst they concentrate on the final spec for the baseline Jib Flattens but is a short clip showing some of that work, done at Seldon Mast in the UK on their test rig.
 

Be the first to write a comment.

Your feedback