Tag Archives: Flatbow

Sinew Backed Yew Recurve Flatbow 55# @ 28″ Bow No.6

This is one of the many “lockdown bows” which I made through 2020/21. Having been furloughed for a couple of months I took the opportunity to tinker with a pile of difficult staves which I’d had kicking about for years. A good time to try and sort the potential staves from the firewood!

This bow came from one such stave. It was nothing more than a branch to be honest but was still one of the better potential staves in terms of its overall shape. That said, It was still flawed to some extent with masses of pin knots on what would be the back side of the stave. It also had quite a lot of deflex across the entire length of the back. Especially in what would be the bottom limb.

Despite the imperfections I committed to making a bow from this stave and had long since promised to build a mate of mine a yew recurve. So I made it my mission to honour my promise using this far from optimal Yew branch. The basic plan was to build a 66″ nock to nock” 50-55lb recurve flatbow.

The stave had nice tight growth rings of between 1-2mm thickness but unfortunately carried little heartwood. The sapwood on what would be the back was too thick at around 12mm thick, but due to all the tiny raised pin knots, it would be impossible to properly chase a ring down to a better sapwood thickness without violating the back around all the tiny raised knots.

A trick which I have used many times before in this situation is simply to accept the violation of rings on the back but mitigate against limb failure by sinew backing. So that’s what I decided to do with this bow.

The stave was only 3″ wide so the crown was moderate. Rather than try and reduce the sapwood thickness in a rounded fashion as would be necessary to mimic the natural crown, I decided to just flatten the whole back with a rasp. In doing this I was able to work down to approximately one sapwood growth ring right down the centre line of the bows back and follow that from one end to the other maintaining a totally flat back profile.

Now that I had nearly 50% of the limb represented by heart wood, I roughed out the general limb thicknesses and finalised the face profile. In order to counter the significant deflex I recurved the tips with steam and performed a small amount of dry heat correction to line up the tips and correct some small string alignment issues. Then it was on with 3oz of deer leg sinew, glued on with my own home made sinew glue.

After the backing was completed I wrapped the whole thing up for a few days in cloth strips to keep the sinew from peeling away from inside the recurves and around the handle.

Once I could see that the sinew was dry I unpeeled the wrapping so I could take a peek. To my disappointment some of the sinew had dried out to form some small fissures. I put this down to one reason. Taking way too long to apply the sinew!

I’d timed the sinew application with the kids getting home which invariably led to a pile of requests, Dad jobs and other frivolous distractions all when I’m trying to slap on my glue soaked sinew bundles. Lesson learnt!!

Anyone who has done any amount of sinew backing will tell you that the best sinew jobs are done quickly and smoothly whilst the glue is still warm and not allowed to set up in between bundle applications. Each fresh bundle of sinew wants to be laid down alongside its neighbour before the neighbouring bundle has started to “Gel”. That’s where I’d gone wrong.

All the distractions had led to me applying bundles as and when I got chance as opposed to in one fast fluid operation. This meant that by the time my next sinew bundle got applied it’s neighbour has gelled up reducing the ability of the fresh sinew bundle sticking to it’s neighbouring bundle.

The result is bundles of sinew separating apart from one another when the bundles start to shrink during the drying process. I should add however that the adhesion between the glue soaked sinew and the bow’s back is not affected by this phenomena.

As disappointing as the end result was, the imperfections that I was seeing in the dried backing were only aesthetic. The functionality of the bow’s backing was completely unaffected.

So onwards we went. After the cloth wrappings had been removed and re-tightened several times over the initial drying period (a week), the wrappings came off and the stave was set aside for nearly a year to cure thoroughly.

I’d kept the limbs asymmetric to try and mitigate for the lower limb deflex which was now substantially less than it was. This was due to the sinew backing pulling the stave back about 1 & 1/2″. Now the deflex was only about 3/4″ in total which was a massive improvement as before backing the natural deflex was about 2 “. After coming out of hibernation, deer antler tip overlays were fitted over the top of the sinew and the tillering began.

In order to preserve as much heart wood on the belly as possible I opted to create a slightly rounded albeit mainly flat belly. An arrow shelf was added in the form of a scrap piece of deer antler.

The bow was quick and easy to tiller and looked nice pulled down to 28″. At this point the weight was 58lb which was about right for the guy who would be getting this bow.

Before finishing the bow I shot stumps with it for a couple of weeks then re adjusted the tiller slightly to weaken the top limb just a tad bit more then called her done at 55lb at 28″ with a neutral tiller. (The owner of this bow shoots three under.) To finish I coated the sinew with a good covering of Titebond III so seal and smooth out the sinew. After sanding it was on with 8 coats of Truoil to finish.

The handle was covered with a piece of scrap leather and the same leather in reverse was used to protect the arrow pass.

I really like this bow. It’s a bit heavy in the hand (630Grams) due to the extra weight from the sinew but isn’t really noticeable once you get in the swing of shooting her. The limbs are an even tapper from 1″ 3/8ths at the fades down to 1/2″ at the tips.

This bow made for a snappy shooter which I really enjoyed shooting. I shot her over the chrono to see if she was quicker than usual and, whilst hardly getting blown away by the speed, I was quite happy with the 162ft/sec average that I got with a 500 grain arrow. That’s not bad for a stick and string bow!

Anyway, I hope you like the pics!

Bow No.4 – Sinew Backed Character Yew Flatbow 50lb at 28″

I built this bow about this time last year after coming across a knarley 2 1/2″ thick yew branch which had been kicking around in my yew stash for a few years. It was one of those branch wood staves which no conventional bowyer would have used for anything other than firewood. And I must admit, I nearly added it to my own firewood stack!

The branch was relatively straight across the cleanest face but had several bumps, knots and wiggles distributed between 8 sections of reflex and 7 sections of opposing deflex. The sap wood to heartwood ratio was about 2-1 with sapwood clearly forming the majority of the branches volume.

I decided to give it a chop about with the axe to see what the belly would look like with most of the waste wood chopped away. To be honest, it looked like it might just about make a bow.

My main concern was that the pith centre looked like it might not come out without reducing the thickness to a point where the bow would end up very light. But after long string tillering it looked like the limb thickness would be clear of the pith whilst leaving behind enough wood to make a light to moderate weight bow. But the pith would run through the handle along with a drying check which looked unsightly.

My original plan was to produce a stiff handled flat bow with a high crowned D section cross section. But I just couldn’t put up with leaving that horrible crack running right along the length of the handle and fades. So I decided to gouge all that split wood out from the handle and the fades leaving me with just enough wood to function as a handle albeit a bendy character handle!

I made the limbs symmetrical and a max width of 1″ 5/8ths. Tiller was 1/4″ positive. Fades about 2″. Antler tip overlays were fitted after sinew backing so that the overlays could sit on top of the sinew. Nock to nock the finished bow measures 64″.

The single layer of deer leg sinew backing was a hedge against the knots but in hind sight was completely unnecessary. That said the sinew has kept the set to absolute zero. In fact before I sinew backed the bow I tillered it as a self bow to 28″ and was content with the 44lbs draw weight and the 1″ of permanent set after shooting in over a hundred arrows.

But I had a small pile of sinew to do something with so decided to stick it on the back of this bow to see what effect it would have on such an undulating and knarly high crowned back. The results were better than expected!

After sticking 2oz of sinew on with sinew glue the bow was wrapped up and shelved until Nov 2022 so it had about 10 months of curing time. During this time the bow had straightened out and the permanent set had disappeared and didn’t reappear even after retillering and significant shooting in. The weight had jumped up too so I ended up with 50lbs at 28″ with no set at all.

With no skins to cover up the sinew I decided to just leave it bare. I gave the whole back a coat of Titebond III to help smooth down the rough sinew before finishing the whole bow with Trueoil. I refrained from wrapping the handle so that the gouged out handle could feature as part of the overall character of the bow.

An attractive knot is in just the right spot to function as an arrow pass so I didn’t bother with an inlay. The final look is certainly rustic but to be honest, I quite like it!

The handle contours naturally in such a way that the crook acts as a locator dish which feels quite comfortable in the hand, even with the handle bending upon drawing. That said, unless I hold this bow lightly I do notice a bit of hand shock. I think that this is down to the mass of the tips which is probably not helped by the presence of the sinew. In fact, this bow is a little bit on the heavy side thanks to the backing. The total weight of this bow is 760grams! Yikes!

I actually like shooting this bow and it gets quite a bit of attention from others who often see it and comment with questions like “What the heck is that!?” Once they’ve shot it though they usually ask if I can make one for them!

Anyway, here are the pics. Hope you like!

This larger knot acts as a natural arrow pass.

Bow No.2 – Character Primitive Ash Selfbow 48#@27”

The stave for this bow came from a 4” diameter Ash tree which produced two staves. One stave was pretty straight and featureless and I used that stave to make a plain but functional rawhide backed recurved flatbow for a friend of mine. The other stave had a nice bit of wiggle in one half and a few other little features so I decided to use it to make this unbacked character flatbow.

The tree was felled back in the late summer of 2022 so it had a bit of cambium left on after taking the bark off. I roughed the stave out whilst totally green and force dried it on a slightly reflexed form in order to fix some slight tip/handle misalignment. The form also evened out some slight but uneven and mixed deflex/reflex in both limbs and corrected the very small amount of limb twist which was apparent in the bottom limb.

After a month of drying whilst clamped to the form positioned indoors on my sun baked windowsill, I was left with a nicely aligned stave with an inch of evenly distributed reflex and just the right amount of wiggle left to make this flatbow worthy of the title “character bow”.

The small to moderate crown on this stave was worth considering. I find that a higher than average crown on tension strong woods like ash can sometimes be advantageous. As I’m sure many bowyers will attest to, Ash wood bows are quite susceptible to compression fractures on the belly. This is because Ash is far stronger in tension than in compression.

The small to moderate crown on this stave could allow most of the back of this bow to work in tension. Too much tension could chrysal the belly if not considered carefully in the design process. A high crown would allow less of the backs width to work in tension therefore reducing the crushing force imposed on the fairly flat belly.

Bearing in mind that the growth rings on this stave were a bit on the thin side, and that the early wood in the growth rings made up a reasonable amount of the bows volume, I decided to round the corners on the back quite heavily in order to create an artificial high crown and reduce the tension strength of the bows back.

I’ve used this little trick many times before to help protect the bellies of bows made from compression weak woods such as Ash, Hazel and Elm which are all very strong in tension. The result is a D shaped limb cross section with the curved portion of the D representing the bows back and the flat portion of the D representing the bows belly. The complete opposite to a classic English Longbow design which works very well with high quality Yew.

The down side to this approach is that much of the edge wood is taken out of commission. The up side however is that the full width of the flat belly is still able to function by providing compression resistance which will oppose the crushing forces of the tension strong back as the belly relates to the now tension weakened artificial high crown.

The artificial high crown imposed in the design of this bow worked well at preventing fretting on the belly, as did additional mitigation measures such as forgoing recurves, minimising the length of the stiff handle section, and maintaining adequate limb length and width. For this reason the bow was kept long at 66” nock to nock and has 1″ 15/16 wide limbs for the first two thirds of the working sections. The riser section is approx 10” long including 3″ fades and is stiff.

Previous experience of Ash staves from this particular area have reinforced the idea that extra precautions need to be taken to avoid excessive tension forces on staves like these which clearly have limited compression strength. For this reason I opted to keep the weight down to 50lb at 26″ or less which is around my favourite draw weight anyway. Much heavier than this and fretting might occur without increasing limb width or length, which I couldn’t really do with this stave anyway given the dimensions I had to work with.

The bow was very easy to tiller, even with the wiggle in the first third of the top limb. The tiller is elliptical ¼” positive and shoots well with split fingers with both limbs timing together very well. When unstrung after shooting a few rounds this bow shows about half an inch of sett which quickly returns to dead straight after resting.

Since the bow was for me to use I opted for simple but small self nocks. If I’d built it for someone else then I’d probably have put overlays on it. The arrow shelf was a last minute addition whilst contemplating the final handle design.

I like to shoot of the knuckle personally but figured my wife might shoot it so I used the significant width of the staves handle section to produce an arrow shelf which is certainly not cut to centre, but is not far from being in perfect alignment with the string which clearly favours the left side of the riser. This bow isn’t very arrow fussy but definitely favours an arrow in the 45-55# range.

The lightly fluted 3” fades were an afterthought and were an attempt to create a little more feature to the otherwise plain bottom limb. In hind sight this was a risky manoeuvre on a timber like Ash which is very prone to delaminating between the growth rings at the fades. That said, so far so good. No sign of any splitting yet and I’ve been shooting this bow quite a lot.

The finish on this bow is an oil based dark oak stain followed by many coats of Trueoil. The small amount of cambium left on the back picked up the stain differently to the exposed wood on the back which created a nice camo effect. This particular stain really grabs hold of the grain on Ash and produces a beautiful high definition wood grain on the belly.

The handle is contoured to my favourite grip pattern and is covered with a scrap of leather from an old jacket which I rubbed some earth pigments into in order to produce a more mat/antique appearance. The arrow pass is covered in the same leather only rough side up.

This bow shoots well. Not the fastest longbow by any stretch (450gn arrow at 27” 148ft/sec) but nice and comfortable to hold back at full draw without stacking much if at all. No hand shock due to the balanced tiller, comfortable grip and moderate tip mass.

I really like this bow and it has been my favourite stump shooting bow throughout the autumn of 2022. That said I have loads more just like it and might have to find a new home for it since I’m fast running out of space for more bows. Well, at least that’s what the wife keeps telling me! If you like the look of this bow then keep an eye out on Ebay as it might end up being listed there some time after Christmas. If I do list it then I’ll edit in a link to the listing at the top of this post.

Here are the pics: