Ozbow

Been hankering to do a takedown for some time and after the success with my first one piece 'curve bit the bullet and went for it.Riser is half charcoal actionwood / purpleheart , mosaics are purple heart/ silver Ash.Belly lams are spliced purple heart/ Zebrano Limb pads are Zebrano and tip overlays are purple heart.

Cant string it for a few days as I want the finish to harden some, before using a stringer on the limbs. tip overlays are purple heart with accents of silver ash/ red palm.

finished weight came in at 50# at 28''. I will have a force draw curve posted plus chrono speeds once I can string it.I am now making these bows to order prices depending on wood choices etc.I now offer HH style longbows, one piece curves, and this takedown models, which I call the 'tempest', the one piece is'banshee' and HH longbows 'wedgetail' I also make D/R models but am not keen on making these although that is absolutely no reflection on their performance, these are called 'safari' models.This bow has black glass on the back of bow and the spliced lams of purple heart/ Zebrano on the belly.

Congrats on making your first take down recurve Bob. It looks like you have put a lot of work into that one. It will be good to see it strung.

I think you should turn off that misleading date stamp on your photos too.

Jeff

Some Very Nice work there Bob, Congratulations on a Superb Effort. "Looks Real SEXY". Cheers Roadie.

thanks Jeff. I would turn it off if I could find where to! i will post photos toward the end of the week of it strung and hopefully with some chrono results too.
Thanks for your kind words Roadie, I must admit to feeling a bit extra pleased with this bow.Hopefully the start of many more like it.

Beautiful work Bob! Congrats on such a classy looking bow..

Thanks Blu dog, appreciated!

Bob, cracka first take down mate, is good to see the progression in your craftsmanship and having a go at the splicing in lams, how true is the saying the more you make the better you get. Congradulations.

Cheers Wayno

Thanks Wayno, done quite a few spliced lams, and quite like the effect, but I am always up for a challenge, trying all sorts of things.

Awsome looking bow, wish I could turn out something as good looking as that.

Great bow Bob

Thanks Steve, it's mainly a question of perseverance! Ta muchly Rod!

Very nice Bob, a great effort for the first one. well done Bob.

Cheers... Rod

Well done Bob, a lot of hours went into that one.

Did you have many hassles with the limb and bolt/pin alignment? I use the Bingham limb and riser drilling jig.

Daryl.

thanks Daryl, yep few hours in it.Had some small issues with the pin holes but managed to work around it. I bought a dowelling jig off eBay for this one but it has serious limitations due to the fact it can only be used from one side meaning any discrepancy will be doubled when 'flipped', to do the opposing section. I am in the process of obtaining the necessary material to fabricate my own which will allow drilling from either side, theoretically giving perfect alignments.

Beautiful, beautiful bow. As with Greybeards bows, yours are always to aspire to - more functioning works of art than hunting/sports tools.

How did you find working the Purpleheart? I used it a year or so back when I had only handtools and found it to be impossibly hard...

Gee thanks Nezwin, but I hope they get used as there are intended, all sorts of things. To be honest with the advantage of my mechanised tools such as spindle sander , face sander, and bandsaw, it really wasn't an issue, no worse than some others like Wenge which although beautiful is as porous as a sponge.

Couple more shots with the bow strung, apologies about the 'model' plus another of the detail work in riser.

It looks good strung Bob!

Jeff

Thanks Jeff. It was actually about a 1/2'' low on the brace height when i took these shots, string must have unwound a little. It's a smooth quiet bow to to use. I will get it on a chrono next week.

Looks fantastic Bob

Thanks Bentie.

Great work Bob, excellent effort for a first.
After a few more you'll probably do what I did and get braver about getting rid of those flat surfaces on the riser (makes them look more streamlined and sporty).

On a different note I recently worked out that "Red Palm" is Coconut wood,,,, ,,,, Man there's no shortage Coconut trees around here, when I get some time I'll go out and cut one down and mill it up, I'm sure I could supply it at less than half the price that I saw it advertised for on the net.

Once again Great work on the bow Bob.

Rob.

Crikey Bob!
Your not messing about are you mate! Great job! Your up there pushing the comfort zone mate.

Flatliner wrote:Great work Bob, excellent effort for a first.
After a few more you'll probably do what I did and get braver about getting rid of those flat surfaces on the riser (makes them look more streamlined and sporty).
Rob the 'flat lines' are part of this riser design but I do understand what you are saying.
On a different note I recently worked out that "Red Palm" is Coconut wood,,,, ,,,, Man there's no shortage Coconut trees around here, when I get some time I'll go out and cut one down and mill it up, I'm sure I could supply it at less than half the price that I saw it advertised for on the net.
Yep red palm is just one species of coconut palm. however as for milling even a trunk of around 12'' dia will not yield a great deal of timber as only about 2'' thick of material is recoverable as the remainder is very pithy and unsuitable.
Once again Great work on the bow Bob.
thanks Rob.
Rob.

Thanks Hazard. Once I recover from a big weekend at the state titles I will try for chrono speeds etc.

Just done a force draw curve, but haven't been able to get chrono speeds yet because of where I have to place the chrono in our driveway . Missus car is in the way so I always have to wait until she goes out. there is a couple small 'blips' in the curve which I put down to the fact that the winch cable sometimes slightly binds on it self making a very small blip or jump in the readings.Nevertheless it demonstrates a very good curve with a fair amount of preload early on as one might expect, and then a very smooth and even transition out the the 28'' with no sign at all of exponential or rapidly increasing increase in draw weight.It does continue like that beyond that but am aware that using those extra values will reduce the calculated efficiency of a bow.
As an extra bit of info The one piece recurve I recently made and sold to a happy client took first place in class at last weekend's state ABA titles with a very respectable score.

any comments on the f/d curve?

bigbob wrote:......Nevertheless it demonstrates a very good curve with a fair amount of preload early on as one might expect, and then a very smooth and even transition out the the 28'' with no sign at all of exponential or rapidly increasing increase in draw weight.......

The curve looks good Bob, do you know what the stored energy is at 28 inches?

bigbob wrote:......It does continue like that beyond that but am aware that using those extra values will reduce the calculated efficiency of a bow.....

How and why will extra stored energy reduce the calculated efficiency of a bow?

I take my recurves out to 32 inches to check limb design, string angles etc. but for consistency for comparison purposes I do the calculations at 28 inches.

Daryl.

Daryl by my erratic calculations the stored energy of this bow is 53ft/lbs and the PDF is 51.25Lb giving a ratio of better that 1: 1. Extending the draw weight beyond 28'' lowers the dynamic efficiency of the bow.I know it is a very smooth bow to draw allbeit with a fair amount of preload which smooths out to a very constant incremental increase averaging around 2lb/ inch of draw this does continue past 28'' but i can't redo the graph for some days as I decided to put some more finish on the bow. I need to do chrono tests too to obtain dynamic efficiency etc.