Warpspeed to Amsteel end-to-end splice
 

Maybe this is a silly question, but I'll ask anyway. Is it possible to splice Amsteel to Warpspeed (or similar core-dependent lines) end-to-end?

I have a nice nearly brand-new length of Warpspeed, but decided to do a 2:1 halyard (to get good tension on a the furling line for a code zero). So now I need another 20 feet or so. And no matter what I try, I can't make the stuff stretch :) I guess that is why we pay the big money for high-tech lines...

Specifically, I'd be interested in splicing 1/4" Warpspeed, which I think may be more difficult to work with than larger diameters (I don't have experience with anything larger, but I can confirm that 1/4" is a pain).

If it's possible, would 3/16" Amsteel be the appropriate dimension to approximately match the core of 1/4" Warpspeed (and fit back into the cover)?

I would imagine the process something like:
--Milk back ~5 feet of the Warpspeed cover
--Trim off some of the Warpspeed core (maybe a foot or so? Enough that we can later milk the cover back over crossover point)
--Splice the core to the Amsteel using Samson's 12-Strand Class II splice (it calls for 7 fid lengths, or 36.75 inches for 1/4")
--Milk the cover back over the crossover
--Stitch / whip

The end product would (I think) be similar to Warpspeed with a stripped end. Naturally, this isn't a process Samson will want to document, since they'd prefer I buy more Warpspeed and strip the cover, instead of adding Amsteel at ~1/2 the cost per foot.

I suppose an alternative would be a splice from Sta Set or other dacron double-braid to Warpspeed, at the tail of the line - it wouldn't even need the full strength of the dacron, since that part of the line would only need to hoist the weight of the sail, and would be coiled past the clutch before the halyard was under tension. It would just have to be a smooth enough transition to pass through the clutch (mine are sized for 1/4" - 5/16" line, so a small lump at the crossover would probably be fine for me, although that might not be a general solution).

Connection
 

Hello,
It sounds as though you will need a constant-diameter splice, to get it past the stopper. That is fine, except that you also will need to reef this sail, and the splice you would make would be rather weak, so in order to avoid loading the splice you would have to bury the new piece twice the depth of the deepest reef. No savings there, and a lot of work.
You will also,of course, need to have the covered portion finishing above the stopper.
It might make more sense to -- as you suggest -- make a constant-diameter end-end splice to a cheap double-braid Dacron tail onto your Warpspeed, proportioned such that the splice is past the stopper, even when deeply reefed.
Fair leads,
Brion Toss

Thanks. This is a halyard for a code zero on a continuous-line furler, so no reefing necessary (the sail is either up or down), but it sounds like a cheap dacron tail is the best option (well, 2nd-best, the best probably being to spend the extra money for a full-length halyard).

Glad to know an end-to-end between dacron and type-II line isn't an impossible idea.