I'm building a 6'6" spinning rod using fuji blyag/blag guides and the 27x method. The reel is a daiwa bg 2500. My calculation shows that the choke guide should be 50.97 inches from the spool lip. That only leaves 15 1/2" to the tip. If I use 3 runners the last will be somewhere around 2 1/2- 3" from the tip. But 2 runners doesn't seem like enough. I'm looking for some advise from you guys who are all far more experienced than me. Thanks

The amount of rod blank beyond the choker is of no concern. So you're just left adding enough guides to provide adequate stress distribution there. Keep in mind that you don't have to progressively space your guides along the tip - you might take that last 15-1/2 inches and spread it equally among the 3 guides. Or, put the first one about 4 inches from the tip and add the next two where they "look about right." You should be able to easily do this. Don't sweat it too much.

Something else you could do - if you move the choker guide up, or back, perhaps an inch either way, you may find it easier to locate 3 running guides, or just 2, and have things come out to your liking.

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Ok, thanks Tom.
Another question. When I static test for stress distribution how much "deflection" is acceptable. For example if the line is say a 1/4 inch from the blank under no load and under load it is 3/8 is that reasonable.

[anglersresource.net]

One thing to consider on the upper 3rd, once you apply more than a little bit of load, the tip will flatten out. But the distance between the line and the blank is really of no concern - it's not how close it is, but does it actually touch? Is it similar to how the line looks in the other guides? And even if the line actually just touches the blank, it's not automatically an issue. What you don't want is the line passing below the blank between any pair of guides. That would be unacceptable, but a light touch here and there under full load for that portion of the blank is no big issue.

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This is a spinning rod right? Why would the line touch the blank?

If gave that impression with my last post sorry. Yes this is a spinning rod and no the line doesn't touch the blank. I read the anglersresource link and understand much better now.

Are you using braid or mono/ fluorocarbon? If you are going to be using braid why not go with a KR concept build? I rarely use the NGC/27X method any more, I like the KR concept better, even with mono up to 12 pounds.
Norm

I'll be using 10 lb mono on this one. I'm already planning the next build and was thinking about going KR on that one.

Once you go to KR, you won't be going back.

Personally, and this is based on my experience .... unless you are using a very stiff fluorocarbon line (and you wouldn't be doing that on spinning gear) a KR concept guide train handles fluorocarbon line beautifully. I use either 8# or 10# fluorocarbon line on my spinning rods, and I wouldn't think of using anything but a KR concept guide train. A KR concept guide train will be at least half the weight of an NGC guide train. It will have less line slap, less wind knots, and it will in all likelihood cast noticeably better than an NGC guide train. My guess is that the cost will be about the same, if not less for the KR concept guide train.

KL-H 20H, KL-H 10H , KL-H 5.5M, covers the reduction train. KB 5.5 as the choke guide. KT 5's as runners. Probably 4 running guides, but I personally would order 5. Whether or not you need the 5th one will depend on how closely you want the line's path to follow the curve of the rod. Better to have and not need, than to need and not have. The KR concept GPS on the Angler's Resource page in the left hand column of this page will give you the measurements for the reduction train guides, and the choke guide. Placement of the running guides is done using the 2 line static load method.

You will be amazed at the performance of a KR concept spinning rod guide train.