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Forums > Windsurfing Tasmania

RDM or SDM for slalom/GPS?

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Created by BFlood > 9 months ago, 14 Mar 2013
BFlood
NSW, 181 posts
14 Mar 2013 12:54PM
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Hi all,

looking into revitalizing my quiver to suit slalom/gps sailing. I've managed to track down the right sails so that I can rig everything from 5.4 to 8.5 on a 460 mast.

The question is....RDM or SDM? I dont sail consistently enough to feel the difference so really I just want to know what everyone else is using so when I buy your second hand sails their cams will fit on my mast.

Cheers,

Floody

Kazza
TAS, 2344 posts
14 Mar 2013 1:46PM
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I can never remember what RDM & SDM stands for, so I call them the fat mast & skinny mast. I'd go the fat mast, suits all the race sails and their cams. Some high tech race sails are very mast sensitive and made to rig on their own brand masts. I'm selling my 6.0 Severne Overdrive as soon as my new 6.2 arrives if your after a slalom/gps sail, it's not so mast sensitive & rigs on fat or skinny.

deejay8204
QLD, 557 posts
14 Mar 2013 2:16PM
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Kazza said...
I can never remember what RDM & SDM stands for,


Reduced Diameter Mast, and Standard Diameter Mast

izaak
TAS, 2013 posts
14 Mar 2013 6:13PM
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Really depends on what sails you are planning to use. With either type of mast. So what sails are you looking at or now have?

BFlood
NSW, 181 posts
14 Mar 2013 7:45PM
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Thanks Kazza.

Izaak I've currently got:
2012 Severne Convert 5.4 (my B&J sail)
2004 Gaastra Nitro5 6.6 & 7.6

Currently looking into an 8.6 Overdrive to get out on the lighter days

the 7.6 will be next to go...probably with a koncept, NP RS or reflex/overdrive in a similar size bracket. Just gotta find the coin

buzzy
TAS, 2433 posts
14 Mar 2013 8:46PM
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Rule of thumb, RDM's are stronger and take more punishment. I would only use SDM in full race sails.
This probably doesnt answer your question though, sorry!

bigbear
QLD, 151 posts
14 Mar 2013 8:35PM
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Your Nitro 5s will only rig on a sdm. If you get an sdm of about 60 to 75 %carbon it will be a lot less likley to break and you won;t notice the difference in performance. Are those Nitros my old sails? They were great sails!

BFlood
NSW, 181 posts
14 Mar 2013 10:02PM
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They are Rob,

I've been trying to figure out who i bought them from, they made me the windsurfer I am...thanks very much.

Unfortunately I didn't look after the 100% NP 460 you also sold me as well as I have the sails...it came to a fairly catastrophic end in a shore break last easter

geared4knots
TAS, 2649 posts
15 Mar 2013 12:47AM
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NP and Severne on same mast..

mast curve [ not stiffness] is totally opposite between Neil Pryde and Severne, SO remember choose what sail brand you want to rig before buying a mast.
wrong mast on wrong sail will rig like poo!, especially with some brands.
Look at Unifibre mast compatability chart to see the differences between brands.

Kazza
TAS, 2344 posts
15 Mar 2013 9:27AM
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deejay8204 said...
Kazza said...
I can never remember what RDM & SDM stands for,


Reduced Diameter Mast, and Standard Diameter Mast



Thanx deejay, that will stick in my brain for the rest of my life



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"RDM or SDM for slalom/GPS?" started by BFlood