Hi,
Snapped my mast (520 RSX) at a competition while rigging, would it possible for me to cut the frayed carbon off and make it into a small rig mast? (as i only snapped a metre of the mast)
This could also be topic for broken mast cut down in general.

If you cut off the top 1m then the mast will be too stiff for the smaller sail. If you cut off the bottom, you may not fit the mast extension in the reduced diameter of the new bottom.

But give it a try and see how it works

John340 said..
If you cut off the top 1m then the mast will be too stiff for the smaller sail. If you cut off the bottom, you may not fit the mast extension in the reduced diameter of the new bottom.

But give it a try and see how it works

I have snapped the bottom , it would be possible for me to put carbon inside the tube so it fits an rdm?

Roy1000 said..

John340 said..
If you cut off the top 1m then the mast will be too stiff for the smaller sail. If you cut off the bottom, you may not fit the mast extension in the reduced diameter of the new bottom.

But give it a try and see how it works

I have snapped the bottom , it would be possible for me to put carbon inside the tube so it fits an rdm?

Yes but expensive. You need a fitted carbon sleeve which in Sydney you would usually buy from CST or C-tech (NZ). We did it with Flying 11 masts to stiffen them while staying within the class rules. It might not be worth it unless it magically fits a standard size tube.

Or you could just buy a slightly oversized tube and sand your life away, depends how much you value your time.

I've done the opposite, fitted a slightly reduced mast that had a broken base into an SDM broken base. It works surprisingly well. I even got PBs speeds using it.

Roy1000 said..

John340 said..
If you cut off the top 1m then the mast will be too stiff for the smaller sail. If you cut off the bottom, you may not fit the mast extension in the reduced diameter of the new bottom.

But give it a try and see how it works

I have snapped the bottom , it would be possible for me to put carbon inside the tube so it fits an rdm?

No

I guess it depends on the overlap, I mean you guys all trust your two piece masts don't you?

decrepit said..
I've done the opposite, fitted a slightly reduced mast that had a broken base into an SDM broken base. It works surprisingly well. I even got PBs speeds using it.

So you snapped the base of the mast but then found another mast bottom and sleeved it?

Pcdefender said..
I broke my RRD Firewig 430 100 percent two feet below the boom last month.

I overlapped the bottom piece with what is left of the top piece of the bottom half and is now a 375 mast.

The fit is so secure. Impossible now to remove.

Not tried it yet. 1.5kg.

Free to good home

pop it up on the free forum im sure someone will take it pos a beginner

BSN101 said..
Hijacking this thread, I have a damaged bottom half that dragged along the road on the insert for the top half. Question is what's the minimum acceptable length for this now it's a bit shorter. It's a great mast that I'd really like to be able to use. Maybe for a light weight not me. It's a NP SDM 430.

Surely you could have the pointy bit facing forward so the load is on the longest bit , then it wouldn't make much of a difference?
also how did this happen?!?

Roy1000 said..

BSN101 said..
Hijacking this thread, I have a damaged bottom half that dragged along the road on the insert for the top half. Question is what's the minimum acceptable length for this now it's a bit shorter. It's a great mast that I'd really like to be able to use. Maybe for a light weight not me. It's a NP SDM 430.

Surely you could have the pointy bit facing forward so the load is on the longest bit , then it wouldn't make much of a difference?
also how did this happen?!?

I agree with the above idea . As long as the long part is close to original length . I would resin a plug , halfway down the end with something solid so the tip doesn't deform . Keeping in mind , there is also a lot of sideways flex .

Roy1000 said.. >>>So you snapped the base of the mast but then found another mast bottom and sleeved it?

A mate snapped the base of a 2 piece SDM I had inherited a one piece MDM, that had also been snapped at the bottom, (don't know how, I've found these masts very close to indestructible, I've had mine since the mid 90s).
The base of the SDM was a good snug fit over the MDM, to get the mast length I needed, it's now about 380.
So the boom reinforcement lines up where it should be. There's plenty of overlap, so the whole thing is a bit heavier than standard.