Ozbow

Planned on making myself a deflex/reflex around 45# - 50# and 66NTN. The gods were frowning and it came in at 57#!!! Not sure just what happened. It's charcoal actionwood riser with Osage accents along with white phenolic.

Limbs are Bubinga veneers on belly and bamboo core. Chevron of silver ash and Gidgee accents.

strung profile.

Very nice indeed Bob, great colors, bummer about the extra pounds. Are you still going to keep it?

Rob.

Bob, you are certainly putting some work into the handles, I am partial to the charcoal Actionwood, what is it like to work with?

bigbob wrote:The gods were frowning and it came in at 57#!!! Not sure just what happened.

They must have paid you a visit after they left my workshop.

I was building a bow for stock and wanted something around 55 to 60 lbs. Calculated the core thickness from previous records and to my surprise the bow came in at 48 lbs.

The vertical bamboo board was from a new box and I think a different manufacturer to my previous supplies.

The bow can sit on the rack waiting for a buyer.

Daryl.

[quote="Flatliner"]Very nice indeed Bob, great colors, bummer about the extra pounds. Are you still going to keep it?

Yep Rob just going do bit extra trapping and bring it down a bit.
Daryl, the charcoal actionwood is quite good to work with, but care is needed as it is susceptible to imbuing its colour onto the phenolic when sanding. [one direction too] Only downfall I find. Funny you mention about the 'boo as this one came from a new box too.Go figure!.Actually the handle work is probably not quite as laborious as it might seem. The I beam does not go right through to the ramp overlays in one piece as it appears . It is just a standard 1 1/2''x 2'' block with the I beam running through centre .Once I do it I then cut the curve to the form. Once the lams and glass are glued up the ramp overlays are cut from the off cut from the curve and centered to match the I beam.

Looks great to me Bob, even the heavy ones need lovin

thanks Benty, shoot this weekend you know?

mmmmmmmmmm very nice Bob i love the look of that one you done well again mate

thanks Hilly might see you on Sunday? Second shoot for the year.

i wont be there Bob getting a little opp on my knee tomorrow so mite be the next one after that mate

gawd whats happening with knees, first Roadie now you. i'm on a waiting list too. hope it all goes smooth for you chief.

gorgeous Bob! well done.

Love to Bob but still got my hands full just for a while longer

Oh I see extensions eh?

or frustrations Bob depends on which way your rolling on the day. IF i can pull a few hours out I am always keen for a shoot.

Very very nice lines Bob.

I agree with Darryl, the Grey Actionwood is very nice.

Great job.

Cheers
Troy

Looking good Bob,i like working with the actionwood and diamondwood

i' m starting to like it too Rod except for the small issue I mentioned with Daryl about the sanding dust smearing into the phenolic. It is good to work and obviously has plenty of appeal, though I still like the real warmth of actual timber like our native species.

Yep I agree

Very nice Bob. On the subject of colours, that Osage is outstanding. Would be good to know if it stays that bright over time. I have heard it will darken up, but I guess it has a lot to do with UV exposure etc.... That is one stunning bow, I'd be tempted to keep it for that special hunting trip when you don't have to draw it 100+ time per day, it looks to have good "mojo" to me.

Cheers.... Rod

Tthanks Rod. Truth is the Osage will definitely darken. Left in the sun it will go a deep brown colour, which will still look good against the charcoal. Took it on our club for few arrows. didn't have any with spine that really matched, but it punches out an arrow.I intend to take it to trad shoots to demonstrate my bows, but it does have a blemish at the spliced chevrons on each limb. Purely cosmetic but does take a little away from the overall appeal.

Great looking bow. Where do you source the actionwood/stratabond? I can only find overseas suppliers. Are there any Australian suppliers?

Damo , all my glass, phenolic, and Actionwood etc comes from a US supplier. My glue[smooth on] I source from John Mc [Amso 128 here] with the falling dollar its getting painful too!

Here's a force /draw curve I plotted for this bow. I did hope to include some chrono speeds but for some reason, overcast day or what my chrono refuses to give a reading. I'd say it would be similar to previous ones in the 180FPS range with a 9g per inch amo shaft. for some reason too, the damn scanner did a crummy job of scanning but I think you can read it ok. It is a very smooth bow to draw and sure hits where your looking!

tried another scan of F/d curve, might be easier to see.Still cant get chrono speeds. I've got to shoot through our carport to use it and the minister for War and finance 's car is in the way!Big hassle to move too as we have a drive way that must be about 55 deg.

bigbob wrote:I'd say it would be similar to previous ones in the 180FPS range with a 9g per inch amo shaft.

Hi Bob, not used to working with grains per inch but if my maths is correct an arrow of 28" AMO length at 9 grains per inch converts to 4.5818 grains per pound of draw weight.

Daryl.

Hi Daryl.

greybeard wrote:

bigbob wrote:I'd say it would be similar to previous ones in the 180FPS range with a 9g per inch amo shaft.

Hi Bob, not used to working with grains per inch but if my maths is correct an arrow of 28" AMO length at 9 grains per inch converts to 4.5818 grains per pound of draw weight.

9x28=252, 252/55=4.5818. I would concur.

Ok Ok you two leave me alone! Another case of putting mouth [ finger] into gear before engaging brain! How about 9 grains per pound of draw length.This is what happens if you are chronically sleep deprived.! I will endeavor to get some chrono speeds next week when the missus is out so I can use the carport.

greybeard wrote:

bigbob wrote:The gods were frowning and it came in at 57#!!! Not sure just what happened.

They must have paid you a visit after they left my workshop.

I was building a bow for stock and wanted something around 55 to 60 lbs. Calculated the core thickness from previous records and to my surprise the bow came in at 48 lbs.


Daryl.

I am feeling your pain fellas . Today I weighed my latest bow, which is an close replica of a previous bow I made for my son (70 NTN, 57#@28", 0.325 RCT natural bamboo core, brown 0.050" ULS glass and 16" kwilla riser). This new bow when I weighed it was 70 NTN, 47#@28", 0.425 RCT coffee bamboo core, black 0.050" ULS glass and 16" black wattle riser. I even left about 40 thou extra on the width in case of material variation (you can take it off but you can't put it back ) I am going to pike it to 68" NTN to get a bit of weight back but my design is nearing it's limit with the end users 30+" draw length.

57# bow @ 28" draw 47# bow @ 28" draw
It looks like we need to make one bow of a "reference" design to "put into stock" each time we open a new box of boo floor boards. Seems OK but I only make small amounts and haven't sold one yet and am not looking for a market either, but it won't be hard to find someone interested I guess.

Is it possible that very stiff timbers compared to less stiff timbers in the riser deflect a little less in the thin fadeout area (say the first inch or so) resulting in a lot less resistance to bending? My fades are on the neutral axis of the limb so the difference should be immeasurable (outside the fade outs the glass back and belly are doing nearly 90% of the work and the outer 2 lams are doing 90% of the remaining work, with the inner 2 lams under nearly no stress, at least as far as what I can understand)!

Sorry for the thread piracy Bob .

Cheers.... Rod