Author Topic: opinion on knot hole..  (Read 5090 times)

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Offline ScottRoush

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opinion on knot hole..
« on: June 26, 2014, 08:27:44 am »
Hi folks... I started this bow last fall and then a fell winter hit and things went down hill in terms of having time to work on stuff like this.  But things are back on track (although it's still only 40 F this morning!) and I'd like to continue work on this Pacific yew bow.

I've never had to deal with a knot that fully penetrates the bow and I need some advice.  My original plan was to put in a yew plug with sawdust/glue.. but then I read that plugs work well in compression.. but not tension.  So is it best then to only fill it with saw dust and not a plug.. or do nothing? So far I've cleaned out the hole of the dark, dirty stuff.

My other question is whether or not I should pursue a heavy draw ... 110# plus... for a bow that has a fully penetrating knot like this.





You can just make out the location of this knot in the limb....


Offline ScottRoush

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Re: opinion on knot hole..
« Reply #1 on: June 26, 2014, 08:45:08 am »
I just realized that I had posted this question last year.. and got good answers. But at that time the knot was still hidden.  So.. might be nice to get an updated opinion now that this thing is out in the clear.

Offline JW_Halverson

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Re: opinion on knot hole..
« Reply #2 on: June 26, 2014, 10:17:27 am »
The hole is midlimb on the right in the picture, right?
Guns have triggers. Bicycles have wheels. Trees and bows have wooden limbs.

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #3 on: June 26, 2014, 11:12:23 am »
The hole is midlimb on the right in the picture, right?

Yes... sorry I should have pointed that out. Looks like a little black dot in the location you said.. to the right, mid-limb.

Offline DarkSoul

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Re: opinion on knot hole..
« Reply #4 on: June 26, 2014, 06:31:15 pm »
Yew often has loose knots that result in such holes in the limbs. The position at mid limb is a pity, but you're lucky it is positioned in the middle of the width of the limb. Personally, I would not fill it.
Since this hole is essentially an area without the full width of the limb, you need to compensate for it. You could either leave the limb thicker or wider around the knot. Judging by the looks of it, the bow seems already pretty close to final width lay-out. That means you can't make the bow wider at the knot, so you need to make it thicker. Leave a few extra rings on top of the belly around the knot, and tiller it so it is slightly stiff.
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Offline WillS

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Re: opinion on knot hole..
« Reply #5 on: June 26, 2014, 06:40:52 pm »
That is a shame!  I'm with DarkSoul - don't fill it and leave the bow thicker/stiffer there.  There's also no reason to drop the goal weight - there are much heavier yew bows out there with far worse problems!  110# is still reasonably light for a true warbow so unless you want to drop right down to target weight I'd push for as heavy a bow as you can.  There's no reason that won't make 110#!

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #6 on: June 26, 2014, 06:49:08 pm »
Okay.. thank folks.

Well I may go back up in my target weight then. Originally I had wanted at least 120#.. but if this can survive at that weight with the knot then great.

As a side.. given that this bow succeeds.. I was hoping somebody could recommend a fletcher to make a dozen arrows for this.  Some standards and some flight.  Stateside would be best.... but I'd like some nice shafts. I will forge the points...

Offline Del the cat

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Re: opinion on knot hole..
« Reply #7 on: June 26, 2014, 06:56:35 pm »
IMO, you are ok for a medium weight bow if you simply peg the hole, say up to 80# as long as you keep the back fairly wide. Try not to disturb the integrity of the sapwood where it flows round the hole.
Another solution is to peg the hole (right through) and then rasp away a shallow curved depression along the back (going from no depth to say half the depth of the sapwood where the knot is and then fading out to nothing again) for say 4" and overlay a sliver of sapwood. That will improve the strength and integrity of the back. That would prob be ok for higher draw weights.
Plugged knots on the belly are no problem at all. What is a problem is unplugged knots which have manky black rings round them which compress causing a pinch.
Personally I think the the advice to leave it unplugged is poor on an ELB with it's narrow limbs, but then I've never tried it so I'm just going on gut feel.
Bottom line is, only you can decide. measuring the width of the hole on the back may help you decide. if it's less than say 1/4 of the width it's prob' OK.
Del
« Last Edit: June 26, 2014, 07:02:41 pm by Del the cat »
Health warning, these posts may contain traces of nut.

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #8 on: June 26, 2014, 07:04:26 pm »
Thanks Del...

If this is a risky endeavor.. I'd rather have a medium weight bow than no bow at all. I do not yet have an English longbow in my collection and this yew stave was not cheap.  I'm fine with waiting for a better stave on the warbow.... and maybe just plugging this one.

Offline WillS

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Re: opinion on knot hole..
« Reply #9 on: June 26, 2014, 07:55:23 pm »
FWIW I would suggest making your own arrows.  They're a fraction of the price of bought ones, and if you can make a bow you can definitely make arrows!  You'd be paying somebody a fortune to glue some feathers on a shaft and wind silk around them...

Took me a while to get mine to where I wanted them (still working on them actually - finally got round to using 1mm thick British cow horn for the inserts rather than the whopping great 3mm slabs of buffalo horn you can buy from archery shops for "medieval" arrows, so they're actually resembling the Mary Rose arrows now, plus I managed to pick up around 400 goose and swan feathers from various locations near me (for free!) so no more Turkey feathers!!) but I know now that I could never pay for them - they're too personal and unique to get somebody else to do them in my eyes.)

That being said, Adam ("adb" on here) makes some superb looking arrows so he might be worth a try?  Oh and Daniel (toomanyknots) posted some stunning war arrows a while back. 

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #10 on: June 27, 2014, 07:57:42 am »
Yeah I've made some arrows.. but it more comes down to time for me. I work for myself and when it comes to arrows I just don't take the time to make them as well as they could be.  Sometimes I find it's better to just pay the specialists. :-) I'm much better at forging the points. 

Offline WillS

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Re: opinion on knot hole..
« Reply #11 on: June 27, 2014, 09:19:12 am »
Fair point! They are ridiculously time consuming!

Do you sell arrowheads to the UK by the way?  There aren't many good smiths available for orders...

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #12 on: June 27, 2014, 09:25:28 am »
I could as I frequently sell entire spears and swords across the pond!  But I'd be more willing to trade at this point for the sake of getting feedback from experienced folk.  I've only started forging them over this winter and haven't spent much time tweaking them.  They look very nice on the outside.. but they probably need a more even taper inside the socket.  I forged the first several without the use of a mandrel. I now have a little mandrel but haven't had time to forge points!  I will get more fired up for this once this bow is strung.

Offline ScottRoush

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Re: opinion on knot hole..
« Reply #13 on: June 27, 2014, 09:30:57 am »
Here is my first one...


Offline WillS

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Re: opinion on knot hole..
« Reply #14 on: June 27, 2014, 10:07:40 am »
Very nice - clean lines!  I'd love to see your take on a Tudor bodkin!