Trilam LB
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Trilam LB
Some close ups of the Bamboo Jarrah Merabau Long bow I am working on interestng the differences in the woods (grass)
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- Stickbow Hunter
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Re: Trilam LB
Looks good and excellent glue lines.
Jeff
Jeff
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Re: Trilam LB
Looks good mate
Re: Trilam LB
ditto the above.Like to see some more 'full frontal' shots
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Re: Trilam LB
Great work mate
Show us a bit more, this looks like a project to sink your teeth into.
Hazard
Show us a bit more, this looks like a project to sink your teeth into.
Hazard
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Never under estimate the strength of a cornered coward.
Everyone is entitled to be stupid, but some abuse the privilege.
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Re: Trilam LB
Shall do , I have cut the tapers and I am not sure what draw weight to aim at . with 2 laminations this design is about 45 lbs .
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Re: Trilam LB
pkearney,
I would be interested in how much set your bow takes with the Merbau (Kwila) belly. It has only moderate mechanical properties and that is a very thick lamination of bamboo you have as a backing for an ELB. How long do you intend to build your bow?
I would be interested in how much set your bow takes with the Merbau (Kwila) belly. It has only moderate mechanical properties and that is a very thick lamination of bamboo you have as a backing for an ELB. How long do you intend to build your bow?
Dennis La Varénne
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Re: Trilam LB
Hi Dennis the bow is 76 " and this a test run before I try some osage . The bamboo is 4 mm centre and tapers to 3mm at the ends
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Re: Trilam LB
At that length, the Kwila is probably well within its compression tolerances.
Dennis La Varénne
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Re: Trilam LB
Removing the rind and ready to start tillering
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Re: Trilam LB
Hi PKearney, Thanks for posting pics of your build. It is a bit risky sanding/violating the nodes on a bamboo backing but as your bow is quite long you may be safe. Cheers Steve
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Re: Trilam LB
Removing the nodes will be interesting. I noticed that the bamboo backing was very thick, so it may not matter. All worth a try even if it goes against conventional wisdom.
Dennis La Varénne
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Re: Trilam LB
Thanks Steve I have tried not to remove all the node just smooth it out cheers Phill .
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Re: Trilam LB
Cool, looking forward to the next installment
Re: Trilam LB
As Dennis eluded too I would be concerned about the compression that such a thick piece of Bamboo will put on the Belly. With a Bamboo backing it is always a good idea to thin the Bamboo after profiling to as near too a Knife edge as possible, 3 mm at the crown at the Centre of the Bow to 1mm at the extremities is not too thin.
A question, Did this piece of Merbau have irridescent green Flecks visable as you Cut it. In my experience Merbau that is very Dark and has these Flecks makes pretty good longer Selfbows and nice heavy Arrows.
At that length and with a moderate draw I think it may be OK. Looking good to this point. Will watch and see how it shoots
regards Jacko
A question, Did this piece of Merbau have irridescent green Flecks visable as you Cut it. In my experience Merbau that is very Dark and has these Flecks makes pretty good longer Selfbows and nice heavy Arrows.
At that length and with a moderate draw I think it may be OK. Looking good to this point. Will watch and see how it shoots
regards Jacko
"To my deep morticication my father once said to me, 'You care for nothing but shooting, dogs and rat catching, and you will be a disgrace to yourself and all your family.' "
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Re: Trilam LB
Early days yet I have done some tillering and got a even tiller , fired some arrows at a low brace taken a 40mm string follow at rest .Bit more DW than I can handle so only 3/4 draw still looks good
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Re: Trilam LB
The shape of your tiller at 3/4 draw is very nice indeed, but I am a bit concerned that it has taken 40mm of set already.
Firstly, the thick bamboo may already be forcing the belly to compress more than it ought to, and
Secondly, you may be bending it past its intended final draw weight which will overcompress the belly and force unnecessary set. If you want a 50lb bow for instance, (or whatever you want it to be), make sure you never bend it past 50lb until it reaches full draw on your tiller.
At 3/4 draw, don't bend it past 3/4 of its intended draw weight and so forth if that makes sense (the Jim Hamm principle of tillering).
You can check this approximately by weighting it at 3/4 draw and adding about 2 1/2 lbs for every inch past that up to your full draw. That total will give you a fair working approximate of what the bow will draw at full draw without actually drawing it out and overcompressing the belly. You then sink it as you tiller it until at 3/4 draw (or whatever stage you have reached) your bow is drawing 3/4 of your intended draw weight.
Your bow is so very well tillered already, I would only be sinking it (taking draw weight off) until it reaches full draw. Full draw length and full draw weight (plus a couple of pounds to allow for shoot sinking) should coincide.
Because the tiller looks very even and the bends are very well distributed - as close to two beautifully circular arcs as possible (see pic), two things occur to me -Firstly, the thick bamboo may already be forcing the belly to compress more than it ought to, and
Secondly, you may be bending it past its intended final draw weight which will overcompress the belly and force unnecessary set. If you want a 50lb bow for instance, (or whatever you want it to be), make sure you never bend it past 50lb until it reaches full draw on your tiller.
At 3/4 draw, don't bend it past 3/4 of its intended draw weight and so forth if that makes sense (the Jim Hamm principle of tillering).
You can check this approximately by weighting it at 3/4 draw and adding about 2 1/2 lbs for every inch past that up to your full draw. That total will give you a fair working approximate of what the bow will draw at full draw without actually drawing it out and overcompressing the belly. You then sink it as you tiller it until at 3/4 draw (or whatever stage you have reached) your bow is drawing 3/4 of your intended draw weight.
Your bow is so very well tillered already, I would only be sinking it (taking draw weight off) until it reaches full draw. Full draw length and full draw weight (plus a couple of pounds to allow for shoot sinking) should coincide.
Dennis La Varénne
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Re: Trilam LB
Thanks Dennis appreciate your help .I have over estimated the set it is really only about 28 mm at present and I think the 3/4 DW is around mid 30s ,need better scales ,so hopeful I can come at 50 @ 29" slowly slowly .
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Re: Trilam LB
Even 28mm is a bit excessive at that stage of tillering on an ELB. However, if it stays under 40mm after shooting in, you will have a good shooter. Lovely tillering though.
Dennis La Varénne
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Have the courage to argue your beliefs with conviction, but the humility to accept that you may be wrong.
QVIS CVSTODIET IPSOS CVSTODES (Who polices the police?) - DECIMVS IVNIVS IVVENALIS (Juvenal) - Satire VI, lines 347–8
What is the difference between free enterprise capitalism and organised crime?
HOMO LVPVS HOMINIS - Man is his own predator.
Re: Trilam LB
I think if I allow for natural curve that was in the bow to start the set is looking more like like 23 mm .we shall see .
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Re: Trilam LB
Lookin' good mate!
Jeff
Jeff
Re: Trilam LB
Any updates on this one? Ive been checking back almost daily, have a surplus of Kwila so id love to see how this turns out
Re: Trilam LB
I have finished the bow and fired few arrows DW has settled @50 # /29 " the set is more than I would like but 28 mm is ok .
Finished with bees wax I think this is certainly a usable combination .
Finished with bees wax I think this is certainly a usable combination .
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Re: Trilam LB
Great to see you ended up with a shooter - congrats!
Jeff
Jeff
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Re: Trilam LB
Looks good, congratulations. Cheers Steve
Re: Trilam LB
Thanks , the Merabau is fibrious and thats seems to mate well the jarrah which is a bit flakey and the bamboo holds it all together .
Very happy so far sends the arrows a good distance and has a nice twang on release .Have yet to find the right arrows but 30 " 40-45 5/16 sika went like a scared cat .
Very happy so far sends the arrows a good distance and has a nice twang on release .Have yet to find the right arrows but 30 " 40-45 5/16 sika went like a scared cat .
Re: Trilam LB
Few more shots of bow still ok but set now 40mm so I feel Quilla is not 100% under compression .Top section shows bit of stiffness I think in last few centimetres . range 150 m easily .
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Re: Trilam LB
Top job!
Time to make another, methinks.
Dave
Time to make another, methinks.
Dave
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Re: Trilam LB
Loose good mate!!!
Jeff
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