Plum bow

Druid
Registered User
Druid
Registered User
Joined: September 24th, 2008, 7:45 am

May 14th, 2018, 6:12 pm #1

Hello my friends... long time ago I was not here.  Nice to see you again.
Plum bow. 61” ntn. 40# 32”. Under 1” of set. 378 grams of physical weight. Upper limb 1” longer.  Finish: oil and bee wax. Not heat treated. 
F17391B7-0A50-452F-AFF8-AE21CF971CD1.jpeg
E5C3531E-B080-4FBC-A4D3-ADF963798CF0.jpeg
022FEDB7-E205-418E-BEC4-5355730481F0.jpeg
7625B7F6-2243-464B-9311-84B8C8684E32.jpeg
3EB71AB5-3C73-4476-A85C-205F40594D12.jpeg
440B06F3-AA96-4719-AD6D-4F224A778E4F.jpeg
2BD4F287-271C-4622-87BA-395410CD9C00.jpeg
3F2CF4C9-F666-4C65-8992-41A9E6639F27.jpeg
CFC35DCC-CC07-492B-833D-9BAC7A306A3C.jpeg
4D98CE1A-6D4A-4149-99A9-695B55DE28F0.jpeg
F17391B7-0A50-452F-AFF8-AE21CF971CD1.jpeg E5C3531E-B080-4FBC-A4D3-ADF963798CF0.jpeg 022FEDB7-E205-418E-BEC4-5355730481F0.jpeg 7625B7F6-2243-464B-9311-84B8C8684E32.jpeg 3EB71AB5-3C73-4476-A85C-205F40594D12.jpeg 440B06F3-AA96-4719-AD6D-4F224A778E4F.jpeg 2BD4F287-271C-4622-87BA-395410CD9C00.jpeg 3F2CF4C9-F666-4C65-8992-41A9E6639F27.jpeg CFC35DCC-CC07-492B-833D-9BAC7A306A3C.jpeg 4D98CE1A-6D4A-4149-99A9-695B55DE28F0.jpeg
Quote
Like
Share

gekitsu
Registered User
gekitsu
Registered User
Joined: July 16th, 2012, 4:14 pm

May 14th, 2018, 11:11 pm #2

hey, i remember that name!

welcome back, and wow, what a beauty that bow is! impressive draw length for that length of bow. you wouldn’t happen to have a full draw photo?

cheers,
raphael
“I’ve seen things you people wouldn’t believe. Attack ships on fire off the shoulder of Orion. I’ve watched c-beams glitter in the dark near the Tannhäuser Gate. All those … moments will be lost in time, like tears … in rain.”
—Roy Batty, Blade Runner
Quote
Like
Share

Druid
Registered User
Druid
Registered User
Joined: September 24th, 2008, 7:45 am

May 15th, 2018, 4:08 am #3

Thank you Raphael. :) Somehow, fulldraw was not posted. :/
212014BB-7E91-46DD-ADC4-C4B1FFDB5BA6.jpeg
Quote
Like
Share

Tim Baker
Registered User
Tim Baker
Registered User
Joined: May 23rd, 2005, 6:22 am

May 15th, 2018, 6:39 am #4

Druid:

That bow is pure! 

What's the brace height, and so you know the plum species, and where it was grown?
Quote
Like
Share

Druid
Registered User
Druid
Registered User
Joined: September 24th, 2008, 7:45 am

May 15th, 2018, 7:46 am #5

Tim Baker... I can not believe that it is you. :) :) :) So glad to see you. 5 years ago we spoke for the last time and nothing untill now. Cheers to you!!!
Thank you for comment. Specie is Prunus Cerasifera. From my country, we have a lot of top quality species. Brace height is 6” from the back of the bow. Back is middle crowned. I didnt want to heat treat it because wood of this stave was a little bit softer than usuall.
During these years I made some experiments with plum and a lot other species. I found some new things and some riddles that I can not explain by myself. It is great you are here so we can discuss about it, if you are OK with that. :)
We mentioned you every single week during our bowmaking saga, all these years, my brother aka Pathfinder and me. Thank you for involving us in bowmaking and for all advices and theories you presented to the world. :)
Quote
Like
Share

gekitsu
Registered User
gekitsu
Registered User
Joined: July 16th, 2012, 4:14 pm

May 15th, 2018, 3:40 pm #6

thank you – that full draw is as impressive as i thought it must be. colour me envious.

raphael
“I’ve seen things you people wouldn’t believe. Attack ships on fire off the shoulder of Orion. I’ve watched c-beams glitter in the dark near the Tannhäuser Gate. All those … moments will be lost in time, like tears … in rain.”
—Roy Batty, Blade Runner
Quote
Like
Share

Tim Baker
Registered User
Tim Baker
Registered User
Joined: May 23rd, 2005, 6:22 am

May 15th, 2018, 8:21 pm #7

Druid:
 
Thanks for that.
 
Can you walk us through the drying process, specifically how you avoided drying checks?
 
Reports of that species' specific gravity vary a lot, averaging about .65. Do you sense that particular stave as being denser? 
Quote
Like
Share

PaleoAleo
Registered User
PaleoAleo
Registered User
Joined: April 14th, 2003, 9:09 pm

May 17th, 2018, 1:08 am #8

That’s a serious full draw photo!!! Awesome. Tom
Quote
Like
Share

Druid
Registered User
Druid
Registered User
Joined: September 24th, 2008, 7:45 am

May 17th, 2018, 7:01 am #9

Thank you Tom. :) I do my best when it is about photos and full draws. :)
Tim, as far as I confirmed plum longitudinal cracks forms mostly not because drying. Reason is enormous inner tension. When I bandsawed straight plum stave in a half I got two curved halfes that can not be connected again except in one point. Then I reduced wood mass to near to bow dimension. I was not satisfied. It wraped badly. Summarum: I got best results with next process: I cut stave in a half (if it is thick enough. If it is not I reduce just belly part just a little. I got cracks immediately on reduced part but most of them will fell of while further reducing and tillering and they are deep just to the middle od the stave, to the core. If we have flatbow then handle will have tiny crack, as this bow above have). Then reduce thickness to double bow thicknes. With its almost finished bow width. When I dried near to bow thick blank it wraped badly. When I leave it thick about 1” or so thick it seems I got better results, almost none or no wraping. After that I had to solve drying checks. Best results I got when I dried plum staves in carefully preserved inner bark. Just carefully peel of its tiny outer bark as a paper. Thick layer of inner bark seems strong enough to do not let wood crack and to slow down evaporating. After two or three weeks drying in inner bark I peel inner bark off to prevent bug damage, danger of cracking is over. Result is excellent stave.
Quote
Like
Share

gekitsu
Registered User
gekitsu
Registered User
Joined: July 16th, 2012, 4:14 pm

May 17th, 2018, 12:57 pm #10

i can confirm that bending-apart-while-bandsawing behaviour – i had that happen with a mirabelle plum log we felled behind our house and cut to size.

raphael
“I’ve seen things you people wouldn’t believe. Attack ships on fire off the shoulder of Orion. I’ve watched c-beams glitter in the dark near the Tannhäuser Gate. All those … moments will be lost in time, like tears … in rain.”
—Roy Batty, Blade Runner
Quote
Like
Share

French Crow
Registered User
French Crow
Registered User
Joined: May 25th, 2006, 5:31 pm

May 17th, 2018, 1:20 pm #11

gekitsu wrote:hey, i remember that name!
So do I! Welcome back.
Good job mate. That wood is strikingly beautiful - yet very tricky to work from what you guys say.
Bruno
Quote
Like
Share

Druid
Registered User
Druid
Registered User
Joined: September 24th, 2008, 7:45 am

May 18th, 2018, 8:26 am #12

Hello and French Crow, my old friend. Nice to see you again. :)
Yes, wood is workable just with rasp, my opinion. Beautifull but complicated.
Quote
Like
Share

Tim Baker
Registered User
Tim Baker
Registered User
Joined: May 23rd, 2005, 6:22 am

May 18th, 2018, 8:38 am #13

Re drying checks, not warping:
 
The inner tension seen when sawing the stave in half involved longitudinal forces, but surface checking involves lateral forces, due to laterally shrinking of surface wood. The two forces aren't effectively related.
 
If the surface of a stave is drying, and as a result, struggling to become laterally smaller while the inside remains the same size then something has to give, and the result is surface checking. But once a small diameter stave is cut in half, lengthwise, there is less inside to remain large while the surface shrinks, and the now smaller and exposed inside is able to shrink along with the outside, so no or reduced checking results. 
 
And in your case, leaving some inner bark on the surface slowed surface drying enough to allow fairly even shrinkage of outer and exposed inner wood.  But argue back if this doesn't make sense.
 
Quote
Like
Share

Pathfinder78
Registered User
Pathfinder78
Registered User
Joined: January 29th, 2008, 6:29 am

May 18th, 2018, 9:39 am #14

Howdy fellas. Just making sure Druid is on top of things with his Tarzan English :)
Buttercup: We'll never survive.
Westley: Nonsense. You're only saying that because no one ever has.
"The Princess Bride"

Quote
Like
Share

French Crow
Registered User
French Crow
Registered User
Joined: May 25th, 2006, 5:31 pm

May 18th, 2018, 10:13 am #15

Some woodturners making bowls out of green wood that likes checking (typically fruit trees) use denatured alcohol to dry quickly the wood without problems.
http://wnywoodturners.com/articles/alco ... drying.htm
A roughed bow could be soaked in a pipe full of alcohol. Worth a try.
Bruno
Quote
Like
Share