Hi - I have recently gotten a 2nd hand MkIII Firewing 7.0. It has 4 cams (including the race system). Last weekend I rigged it on a 430cm Tushingham SDM (recommended mast is a 430 RRD manufactured SDM) with an extension of about 22cm (luff is 453) and about as much manual downhaul as I could manage. However on the water, I could not get the cams to rotate. They wouldn't budge from their rigged position. Any advice please - should I try a winch and/or more extension to get more downhaul, or is that mast just plain wrong?
The Tush mast is considerably more flex top than the RRD sail. Same as NP near enough.
It would be OK for camless but probably just off enough that cams are jammed up against the mast.
Only thoughts based on what they usually are.....
I used to have same mast and sail ( but 3 cams). I bought the FW because I already had the Tushy mast and was advised they were compatible. They worked well together. I suggest with some fine tuning it should rotate ok. I wonder if the correct cams are in the correct places?
The tushy mast actually works better than the rrd mast on the firewing. Make sure that the previous owner didnt put rdm cams in the sail. That will make it impossible to rotate. To my embarrassment i had the same problem on a seconhand sail recently and was unaware that the cams had been swaped.
I used to have firewings from 5.7 to 8.6 and rotation wasn't a problem. The rigging diamensions on the sail were also accurate so that probably isn't your problem, set your extension at 24, use a downhaul tool or wrap rope around a big screwdriver and set so there is about 2cm between pulleys. I never required a winch on these sails.
Another thought, if the previous owner has put cam spacers in, remove them.
Hope this helps.
They always used to be perfect - but I'm going off the newer 2017 Unifiber measurements that show they are quite different now.
As an analogy - Not anything like the old Gaastra and NP disparity, but certainly as bad as any "normal" sail on a NP mast would have been traditionally.
Might depend what age equip we are talking ?
Edit: Swindy is onto it I reckon......
Another thing to look at is the diameter of the Tushingham mast. Some of their older SDMs were just slightly fatter than other brands. That might be enough to impact cam rotation.
As an aside, in my experience the smaller FireWings work nicely on flex top masts (I've tried 5.2 & 5.7 on RDM).
hey thanks so much guys for all the ideas. I checked them all out last night. There are no spacers there and I also tested the cams against mast width. They're definitely snug but not RDM. I rigged it in the garden as suggested with the extra couple cms of extension and downhaul and tried pushing against each cam in turn. The problem cam is the second from the bottom - the one just below the boom cut out and directly opposite the outhaul. The rest can be pushed around fairly easily. What I think it's doing is sort of catching on its edge during downhaul and then not sitting totally flat on the mast. I tried to level it out using my fingers and managed to get it rocking back and forth though you still need it give it a decent push. Anyhow I'm hopeful this will work out fine when next out sailing, Cheers ..