NP or Tushingham sails on Ezzy RD mast?

Has anyone had any success (or failures!) rigging/sailing NP or Tushingham sails on an Ezzy Hookipa RD mast? (specifically NP Combat & Tushingham Lightning).

I received a very prompt and thorough response from David Ezzy this morning complete with IMCS specs for their 400 & 430 masts.

Here's our email conversation (minus full specs which wouldn't copy over):

Q1. I'm considering purchasing at least one Ezzy Hookipa RD mast and would like to know what the IMCS bend curve rating is for the 400cm and 430cm masts.

A1. Our bend curve is a standard constant curve.

All masts made these days are classified constant curve, however, there are two schools of curves out there. Gaastra, Maui Sails and Severne are stiffer tipped. North, Pryde, Tush are bit more flex top. Our mast is in between and fits most sails.

Q2. Also, would the bend curve rating change a if I used a different top or bottom section?

For example:
Q2a. 400cm bottom section paired with 430cm top section

A2a. Our masts are designed to be mixed and matched with different lengths tops and bottoms. We sell each piece separately. Generally, I suggest going with a shorter bottom and a longer top. The 400 bottom/430 top is recommended for our 5.2 sail. The shorter bottom gives a bit more bend in the middle of the sail, which changes the bend slightly away from a "flex top" curve, but still is within the acceptable tolerance. If you go 370 bottom and 430 top, that would be much softer in the bottom and would throw the numbers more into the "stiff top" realm.

Q2b. Or
400cm top section paired with 430cm bottom section

A2b. The 430 butt with the 400 tip will put the curve more flex top, since the 430 butt is stiffer and will bend less in the lower section of the sail.

Comment: The reason I'm asking is because I have three different brands of sails in my quiver and two of these sails (Neil Pryde Combat 4.4 & Tushingham Lightning 6.0) are designed for a mast with a 'flex-top' bend curve (of approx 16).

Our masts will fit your pryde perfectly. I am not the familiar with the Tushingham.

I find that the 2002 - 2005 ish Pryde wavesails set acceptably on my Ezzy RDM's.

However the newer sails, particularly the 2008 - 9 set atrociously.

The mast is too stiff at the top (well, no, the Ezzy mast is 'normal' and neilpryde masts are very floppy top). The result is the sail twists a LOT in the mid leech and the top batten does not twist at all. It has to be seen to be believed.

I set a 2005 4.7 Zone on an Ezzy and it is sweet. A 2008 Zone is literally unuseable.

I suggest caution and rig before you buy

this thread and Ezzy's answers to those questions has explained ( in language that even i can understand) why my Pryde fly set so a terribly on a Gastra mast.

looked ok rigged on land but once on the water it was a disaster.
Just as mark said it twisted in the middle causing a shocking crease through the sail instead of laying off at the top in the gusts.

i can see now how important sail/mast compatibility is. can be rather expensive if you don't know your stuff.

Bit of a bummer, was really keyed up about getting Ezzy RDM masts to suit my 3 sail quiver until I talked to Paul at 2nd Wind. Apparently there aren't any RDM cams available for the Tushie Lightning (even though Tushingham UK told me I could obtain some through 2nd Wind for this sail!). He also didn't think the Lightning would work as well on an RD mast as it would on an SD mast (was designed around SDM specs).

Ahhh, decisions!!!