Home Forums Friends of FOC Sitka spruce and EFOC, failed experiment

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    • David Petersen
      Member
        Post count: 2749

        Sorry to repeat myself but I don’t want to leave anyone out who is interested in this stuff, to save them some time and money. It started last year when I shot a small yearling cow elk (my gawd, the delicious meat!)with a Sitka spruce shaft and 300-grain glue-on Tuffhead. It was a broadside shot and clipped the back inch or so of the scapula, which is thin, soft and flexible. But apparently it was enough to cause the shaft to break an inch behind the head and fall out. Somehow the head alone kept going and stopped in the middle of the heart. Had it not been a lucky heart shot that animal could have run for days. So while I love the light weight and high spine capabilities of SS, which allows for near-perfect arrow weight and EFOC, I had to find a way to control the breakage (same reason, years ago, that I gave up on PoC). After various experiments with ways to reinforce the shaft behind the head I settled on 2″ of aluminum shaft, position hard against the back of the head and with glue protruding from the joint for further reinforcement. This gave me a total shaft weight about 660 with an unheard of (in wood shafts) 27% EFOC. My mistake was shooting only in a soft target until today. I went stumping with 6 arrows and did my best to pick soft targets because I had field points (can’t find 300-grain blunts yet). Still I broke 3 of the 6 shafts, exactly at the joint between head and collar. So here I am with two weeks to opening day and have to start all over on arrows. I am done with all softwoods, period. They work OK, though still break more often than we would like, with 125-grain heads. But I am starting with 300-grain head for the rest of my bowhunting days and working back from there. So now the search will be for the lightest possible hardwood that has the integrity not to break behind a heavy head, and don’t tip the scales like boat anchors. Disappointing as it is, it seems increasingly likely that the only way to go for truly strong EFOC arrows is carbon. In fact the lack of that sort of strength and light weight in shafting is likely what kept EFOC below the surface all these decades. A heavy head with a heavy shaft is still good, but with the lighter bows a lot of us old ducks have been reduced to, that EFOC advantage sure is nice. Anyhow, just trying to save others some wrong turns. At least I had the fun of building the arrows, self-nocks and all.

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      • Doc Nock
          Post count: 1150

          David,

          Far be it for me to ever offer advice on such advanced things as this—especially with wood, but since the damage seems to occur below your external footing, at the junction with the field point… have you ever considered over-footing your footing and letting it extend over the break point onto the point?

          Just a wild thought looking at your picture.

          When I did shoot wood, those Ash shafts were hellish tough. So were some nock tapered RRA standing dead cedar shafts in 23/64 tapered to 5/16 nock end… they bounced off many trees in their day and went Timex on me!

          Alas, they’re long gone… 😥

          A wood die-hard friend went to laminated birch and had good results…but I fear they were likely ‘heavy’ shafts alone.

          Carbon isn’t such a bad route to take…just very, very old wood! 🙂

        • Clay Hayes
          Member
            Post count: 418

            why not use you aluminum footing as shown, but with a screw in adapter. It’d be like you just cut the end off an aluminum arrow and slipped it over your wood shaft. That’d fix any breaking problems between the tip and footing. Seems like I’d seen somewhere that you’d done that in the past.

          • David Petersen
            Member
            Member
              Post count: 2749

              Doc — I like your point that carbon is just really old wood. 😆 And if age has a bearing on traditional, then that makes carbon more traditional than wood, eh?

              Clay — Yes, I tried that before but you can only get alum inserts for alum shafts and that creates a whole new weak point.

              And in both cases, double-sleeving and screw-in adapters, at that extreme of manipulation you might as well be shooting carbon or aluminum, the value of true wood shafts has been so diminished with add-ons. But thanks for the perfectly good suggestions, both of you.

              I’ve been playing with this stuff for a long time now, and at this point unless someone comes up with an affordable way, as has been suggested by others, to pressure-treat the ends of softwood shafts with some sort of hardener, which could then be thinned out gradually a few inches behind the head so’s to prevent an abrupt change in hardness that will prevent breaks, I’m done with softwood shafts unless they’re footed. I have no trouble with carbons from my r/d hybrid but can’t bring myself to shoot them from an Osage selfbow. So it’s back to hardwoods … heavy but with no great shakes for FOC. I have seen what heavy single-blade single-bevel points can do compared to every other point I’ve used in my life, and I like to try most everything. So that’s the one untouchable element and the rest of the arrow has to work well with that. I have some hardwood footed hex-pine shafts and hope to make them work with this bow. Always something. But for now the wife and I “have to” go to town to drink beer with another of our number passing through on vacation, Reg Darling and his wife. Some sacrifices we just have to make,:lol: and my arm is sore from shooting close to a hundred arrows today. Try something new tomorrow.

            • James Harvey
              Member
                Post count: 1130

                Keep us updated with your progress either way Dave. I’ve had the same breakage on SS when they hit something hard(ish). I’ve given some local hardwoods a go, but yes, they are heavy as all get out. My only hopes for trad FOC are Kev’s leopardwoods (maybe getting an intentionally underspined but light shaft and building out the strike plate) or bamboo.

              • garydavis
                  Post count: 101

                  Smith Penetrating Epoxy may be just the product you are looking for. It penetrates soft woods very nicely and if you dipped the first 4 or 5 inches prior to finishing it could conceivably stiffen up the SS enough to blow on through those scapula. I’ve used it in boating applications and it’s pretty awesome stuff. It is pricy though. Try Jamestown Distributors. Good Luck.

                • Stephen Graf
                  Moderator
                    Post count: 2429

                    Dave,

                    I hope the beer helped you get over that dang arrow disappointment! Maybe Reg had some good suggestions…

                    I am screwing up the enthusiasm to make some Eastern Red Cedar Laminated arrows that are maybe footed with osage. I am hoping the laminations will make up for the soft wood in the strength department.

                    But in the end, I think a footed shaft with the back end tapered is about the best you are going to be able to do with wood.

                  • David Petersen
                    Member
                    Member
                      Post count: 2749

                      Steve, I fear you are right.

                      Gary, does this stuff soak completely in, like an oil … or build up on the surface like epoxy? If the latter it won’t work as the glue-on heads will no longer fit, and to not coat the tip that fits into the head would create yet another weak point immediately behind the head. If this idea is to work is has to completely penetrate and not build up on the surface.

                      Thanks for the ideas!

                      And yes, beer helps everything except the waistline.

                    • Troy Warner
                        Post count: 239

                        Dave,

                        You may have already tried this, but….

                        I had some ash arrows and a few hickory, yes they are a heavy arrow all the way through and don’t lend themselves to EFOC. I gave a couple of each to a guy I met at a shoot in Iowa, I think he was from Nebraska, I ran into him again the following year and he had a dozen tapered hickory arrows he gave me in thanks, any way he tapered them past the usual ten inches that most every one else does.

                        I can’t say what the FOC would have been but the balance was an inch or More forward of my cedars with 200 grn field tips, they did fly great out of my 55# long bow with heavy heads, I believe I was using 250 grn field tips for the hickory’s, I’d have to check my tuning notes, they lasted for three years of 3D shoots, countless stumping shots at trees, around rocks, and hunting, I even shot one with an old broad head through a 3/4 inch ply wood and into a cement block (that particular arrow lasted three more experimental(read STUPID) shots at a steel post, a pile of rocks, and a car door before breaking about 4 inches back of the head), although I never got to see how they would penetrate game since those years I never got close enough to even contemplate a shot, the test shaft did penetrate the car door with half of the shaft.

                        It’s weird the things you’re willing to destroy a perfectly good arrow on just to see how tough they are.

                        They are all gone now but I thought it might be worth a try to taper a hard wood shaft more than usual like he did.

                        Sure wish I could remember his name, if I ever get back to that shoot I’m sure I’ll see him there.

                        Hmmmm I think his name was Tom or something like that, I never was any good remembering names correctly but it has gotten worse the last few years.

                        Just my cent and a half of ideas.

                        Good luck

                      • Troy Warner
                          Post count: 239

                          Ok, I found my tuning notes; finished shaft was just over 710grns, taper started 4″ behind point and went to 5/16 nock end, field tips were 250 grn and wolverine broad head was 160 grn. When they did break on impact they all broke about 1-2 inches behind start of taper. I did not figure the FOC but from memory they balanced about, and this is just an approximation, 3 1/2 to 4 inches forward of center, I would hedge closer to 3 1/2 than 4. Finished length from back of point to valley of nock was 28&1/4″. They flew just a hair stiff with the field point and perfect with the broad head.

                          Don’t know if that would help or not.

                          Troy

                        • David Petersen
                          Member
                          Member
                            Post count: 2749

                            Thanks Troy, but no helps since I’m not set up to taper shafts like that. I do have a couple of compressed hickory shafts from many moons ago after I first read Ashby’s Natal Study, which got me started on the heavy-arrow trail from which I’ve never flinched since. But they weighed in the 840s with 125 grain heads so we’re looking at 940s with 225 heads and well over a grand with the big tough 300s I prefer! And I was shooting a 64# recurve back in those days. Don’t they’d they get very far very fast from my 54# selfbow … but I may give a try just for the fun of it.

                          • smiley1
                            Member
                              Post count: 102

                              Dave, I know you stated you wanted to use 300 grain Tuffheads but just thought I’d give you the stats on some 11/32 teak shafts I got from Kevin at Forrester Shafts. 725 grains finished arrow, 4 3″ A&A fletching, 28 1/4″ BOP, 225 grain Tuffhead, 65# spine, 17% FOC. These are parallel shafts so I’m assuming if you got a heaver spine put a 10 – 12 ” taper down to 5/16 and used a 225 grain Tuffhead you could feasibly wind up with a finished arrow right around 700+ grains and because of the taper possibly pick up around 2% more FOC. I plan on using this arrow on whitetails this year shot out of my 1964 47# (at my draw length) Bear Grizzly. They fly great and I don’t notice any significant drop until about 22 + yards. I limit my shots to 15 yards at game so the drop doesn’t really matter in hunting situations. Just a thought.

                              Good Luck, Steve

                            • Ptaylor
                              Member
                                Post count: 579

                                Dave,

                                Thanks for doing all this research before I went and burned a bunch of $ on the sitka spruce (course now I’ll just spend it somewhere else!). I’m going to shoot the carbons this year, and after hunting season is over start experimenting with woods again. please keep us updated!

                                preston

                              • Bender
                                  Post count: 57

                                  Have you considered bamboo?

                                • garydavis
                                    Post count: 101

                                    The Smith&Co Penetrating Epoxy does not build up on the surface. It might discolor a little, but not build up. It could possibly cause the dipped end to swell a little, but that can easily be corrected with a little sand paper. Also, you could probably use a standard blade taper tool for the tip end as the epoxy will harden up the already tapered tip so it would not chip out like SS does in the raw.

                                  • Anonymous
                                      Post count: 124

                                      What about using a footed shaft with the lighter softwood for the rear of the shaft and a very dense hardwood (wenge, purple heart, etc.) for the forward foot?

                                    • Fallguy
                                      Member
                                        Post count: 318

                                        Dave have you thought about trying a full length taper shaft out of hickory? There was a how to article in T.B. years back on making your own shafts using a small plane(I call them a thumb plane). I would get some hickory boards and split it into 1/2 X 1/2 X 36″ long. By splitting them you can eliminate the grain running out the side which is the main failure point for hard wood shafts. I am sure there others with much better information on this than me. It would be good winter project sitting next to the wood stove.

                                      • David Petersen
                                        Member
                                        Member
                                          Post count: 2749

                                          Thanks guys for all the good info. Thanks to a tip from Steve Graf–one of those “Now why didn’t that occur to me?” deals–I used 4″ long hardwood splines inserted across the grain to strengthen the fronts of the shafts. In stumping with Ace blunts I was unable to break a single one. I did lose some FOC by removing the 20-grain aluminum collars, but I’m still over 20% with total weight just over the minimum 650 grains. This is what I’m hunting with … or would be if the rain would ever stop, plus I’ve been annoyed by a combo of minor med problems. So basically, it’s been a non-season for me. I heard the first three bugles the evening of the 7th and the rain began the next day. It’s raining buckets this minute. In such prolonged conditions the elk go to ground and their voices go silent. So I may, or more likely may not, get a chance to try the new arrow setup on an elk this year.

                                          And most importantly, good health to Larry Fischer!

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                                        • Reddog55
                                            Post count: 12

                                            Dave would you be so kind as to explain these hardwood splines to us who are not familiar with them and would like to be. Thanks

                                          • Reddog55
                                              Post count: 12

                                              By hardwood splines do you mean footings?

                                            • Col Mike
                                              Member
                                                Post count: 911

                                                Dave

                                                I like the quote–trust the author is well known8)

                                                Cheers

                                                Mike

                                              • David Petersen
                                                Member
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                                                  Post count: 2749

                                                  Reddog — Things are in an uproar here right now. Give me a few days and I’ll get a photo and explanation to you. It’s not a footing, but just a thin spline of hardwood inserted into a slot cut with a band saw and glued in place. I’m no engineer but guess it at least quadruples the strength of the business end of the wood shaft.

                                                • Reddog55
                                                    Post count: 12

                                                    Thanks Dave!

                                                  • David Petersen
                                                    Member
                                                    Member
                                                      Post count: 2749

                                                      Here’s the best I can do for now. Reddog, as I have no more shafts so can’t do a step-by-step. In the left arrow you can see the thin red line which is the spline. In the right arrow I’ve highlighted it with a felt pen for better visibility, which is why it’s a bit wobbly.

                                                      Using either a tapered or blunt-end shaft, measure back the distance you want to spline to extend and mark–I used 4″ from the tip. Longer would be even better but I just don’t trust myself to make a straight cut much longer. Now use a straight edge to draw a line–and some eyeballing is required–parallel down the center of the shaft from tip to stop mark and aligned so that the cut will be 90 degrees, perpendicular, to the shaft grain. I have an el cheapo Craftsman bandsaw and the table has a gap, or slot, running straight into the blade that’s perfect for using as a guide to feed the shaft in. I really don’t think you could do this with a hand saw. Carefully feed the shaft into the blade to the stop mark. Now turn the shaft over 180 degrees and feed it through again to clean and slightly widen the slot. I used 11/32 and wouldn’t care to try it with anything slimmer, though it likely can be done with a steady hand. A spline no thicker than the width of a wood matchstick is about right, any kind of hardwood. I took a sheet of bow lam wood and marked it to 4″ length and 11/32 width and cut out all the splines I needed for the job ahead of time. Now use a piece of new stiff medium-grit sandpaper to smooth the interior of the notch on one side and then the other. After a while you can move to a doubled sheet so that you’re widening the slot on both sides at once. When you have a snug fit with the spline wood–not so tight it bulges out the shaft–coat the spline with waterproof wood glue (I use TiteBond3), insert and align and clamp lightly till dry. (I learned right off that a C clamp can easily dent soft spruce and now use padded-jaw spring clamps.) When dry, use a razor to trim any excess spline then smooth with fine sandpaper and refinish that portion of the shaft and you’re set to go.

                                                      This by no means turns a softwood shaft into a carbon shaft, but it definitely makes it significantly less prone to breaking, sufficient so that I now feel, after meaningful testing, that I can ethically use them on elk (after I had one break last year behind the head). It’s tedious work, rather like fletching or tying flies, and offers the same sort of satisfaction if you’re in no hurry. But if you set up like a factory line — cut all the shaft notches, sand ’em all, etc. it goes pretty fast. Good luck, Dave

                                                      attached file
                                                    • Anonymous
                                                        Post count: 124

                                                        Very cool, Dave. That’s the same concept (and basically the same application) as plywood or any other laminated wood product, with the strength and stability being added in by use of a laminated ply of different grain pattern (and in your case different type – hard vs soft – of wood). It makes sense that doing that would work.

                                                      • jpcarlson
                                                        Member
                                                          Post count: 218

                                                          Awesome work guys! Its always amazing what happens when you get people together and come up with new ways to solve a problem. This looks like a real winner for strengthening up the front of wood shafts for use with heavier heads. Now if I can just find a light wood shaft which will take my 29″ draw length at 52-55# I’ll try some too:)

                                                          Jans

                                                        • Todd Smith
                                                            Post count: 167

                                                            Good stuff guys. Thanks for sharing.

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