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Mary Rose warbow profile (Read 12318 times)
thabaill
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Mary Rose warbow profile
Mar 27th, 2013 at 3:04pm
 
Hello

A few days ago I searched info about the Mary Rose bows and I found many pics of the bows and that many people make them and they are extremely powerful, much more that it was thought. They varied in draw weight from 100 to 180 pounds. The biggest group of draw weights being in the 150 to 160 pound range.

Since them I am looking for the profile, measures or diagrams of such bows but I only find this:

http://www.primitiveways.com/Otzi's_bow.html

But the data was in the form of cross-sectional moment of inertia instead of width, thickness and cross-sectional shape.

And this:

http://www.norwegianwarbows.com/makeyourownwarbow.htm

But the bows from this measures are more than 7ft long! And I think that they aren't exactly like Mary Rose ones.

I have found that many people had made replicas of such bows or make bows with "MR profile" but they don't tell it exactly o r what makes a bow to be a MR bow type.

I have read that there is info about two bows exact measures (bow A and B) in "Secrets of the English War Bow". Being the bow B more powerful.

If someone has some info. Would yo be so kind as to share it please.

Thanks and greetings.

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Caldou
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Re: Mary Rose warbow profile
Reply #1 - Mar 27th, 2013 at 5:07pm
 
I did find this :
http://www.webarcherie.com/forum/index.php?showtopic=26388&page=3#entry651857

In cm, to change bad bowyers habits Wink
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Dan
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Re: Mary Rose warbow profile
Reply #2 - Mar 27th, 2013 at 9:46pm
 
Are you looking to make a warbow or are you just curious about the design? Either way, Primitive Archer forum is the place to go.

Historical yew bows aren't really my forte but here's what I got from PA forum that you'll probably find helpful.

http://www.primitivearcher.com/smf/index.php/topic,2820.msg39406.html#msg39406

http://www.primitivearcher.com/smf/index.php/topic,17799.msg246722.html#msg24672...

http://www.primitivearcher.com/smf/index.php/topic,8078.0.html

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I was pretty good at slinging like 10 years ago.
 
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Re: Mary Rose warbow profile
Reply #3 - Mar 28th, 2013 at 12:12am
 
Now I want to make one Grin
It seems simple in required materials and overall shape, but still looks to be plenty of a challenge.
(Last thing I'd need is laminations and recurves in my first attempt at a wooden bow. That'd be a surefire way to see it put off indefinitely Wink )
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Re: Mary Rose warbow profile
Reply #4 - Mar 28th, 2013 at 11:26am
 
May I recommend ash as the wood you use?  It will be much cheaper than yew and much easier to work.  You will have to chase a growth ring and it probably will eventually break.  So will yew at those draw weights.
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Mauro Fiorentini
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Re: Mary Rose warbow profile
Reply #5 - Mar 29th, 2013 at 8:21am
 
Topic added to the PW's index.
Greetings,
Mauro.
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thabaill
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Re: Mary Rose warbow profile
Reply #6 - Mar 29th, 2013 at 12:02pm
 
Hello

Thank you very much to everybody.

I am looking for something like this:

Quote:
For those interested the following is the AVERAGE if the 83 complete bows.

Length (measured along the convex side of the bow to get the max length from tip to tip)  1,968mm, 77 1/2"

Length of horn staining  45.9mm   1.803" upper limb   44.4mm   1.754" lower limb

Centre Width 39.5mm 1.417"   Depth 33.2mm  1.297"

Lower Limb        W mm  D mm       W in.   D in
@ 100mm         35.7        32.4       1.406   1.279   
@ 200mm         35.0        31.4       1.367   1.238   
@ 300mm         33.8        30.0       1.331   1.182   
@ 400mm         32.4        28.7       1.275   1.136   
@ 500mm         30.6        27.1       1.206   1.071   
@ 600mm         28.3        25.5       1.117   1.005   
@ 700mm         25.4        23.4       1.002   0.922   
@ 800mm         21.5        20.6       0.836   0.809   
@ 900mm         16.0       16.3        0.632   0.643   
@ Horn Stain    12.75     13.22      0.503    0.517

Upper Limb        W mm  D mm       W in.   D in
@ 100mm         35.3       31.7       1.389   1.250   
@ 200mm         34.4       30.6       1.353   1.204   
@ 300mm         33.2       29.3       1.308   1.156   
@ 400mm         31.6       27.9       1.248   1.103   
@ 500mm         29.9       26.6       1.179   1.049   
@ 600mm         27.6       24.8       1.092   0.980   
@ 700mm         24.9       22.6       0.980   0.894   
@ 800mm         21.1       20.0       0.832   0.789   
@ 900mm         15.7       15.7       0.614   0.618   
@ Horn Stain    12.60    13.19      0.497   0.521

The two sets of readings, metric and imperial were taken by the archivists so they do not necessarily compute the same, however on about 4 bows the imperial readings were absent and so were calculated, there mat also have been the odd reading missing from other bows and if so the other, metric or imperial reading was used to calculate the missing . Please also note that in the 83 bows 3 no were not long enough to have readings at 900 mm in the upper limb and 2 of them were not long enough to have readings at 900 mm in the lower limb , Please also note the choice of upper and lower limb in the 83 bows was made by the archivist, sometimes arbitrarily.


http://www.primitivearcher.com/smf/index.php/topic,26580.msg367268.html#msg36726...

But these dimensions are the average from the 83 complete bows, and I have read from a link, posted by Dan, that there are at least 6 different types. So perhaps the average dimensions are not good for making a bow. Anyway it could be a start point.

I have read that yew here (Southern Spain) could be of the highest quality. But here yew is extremely scarce (I have never seen one). So the wood must be very expensive. And I don't know if it is possible to buy it here. Even if I find a whole yew forest and a I had permission, I think that is a pity to chop that wonderful long living tree. It is and endangered species.

Ash, European nettle tree, hawthorn, black locust,... could be good. Elm is really good, but a fungal disease is killing them and they are endangered.

I am looking for the modulus of elasticity of many kinds of wood and I have found a surprise. Perhaps Eucalyptus camaldulensis could work. It would be nice because we have tons here. But I must see if it works in a powerful bow.

I´m curious abut the subject, and I would like to build a warbow. But I think that I must learn a lot before because I didn't know the existence of the tillering process Cheesy That is the reason because I am looking for the exact measures and profile from a MR bow. Because I have read that with that dimensions the bow would be almost tillered. And I think that it would be easier for a begginer.

I have read about the side nocks in MR bows too.

Thank you very much again.

Best regards.
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Donnerschlag
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Re: Mary Rose warbow profile
Reply #7 - Mar 29th, 2013 at 7:25pm
 
Bill Skinner wrote on Mar 28th, 2013 at 11:26am:
May I recommend ash as the wood you use?  It will be much cheaper than yew and much easier to work.  You will have to chase a growth ring and it probably will eventually break.  So will yew at those draw weights.

I'd probably make it no heavier than 60#, since I'm built pretty slim. :p
But yeah, everything breaks eventually Wink
As long as it would last at least a few years of frequent use, I'd be content
Thanks for the recommendation: the only other bow wood I know of is Osage orange, and I have no idea how to get it. Ash seems more easily-found :p
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Re: Mary Rose warbow profile
Reply #8 - Mar 30th, 2013 at 2:12pm
 
Osage doesn't make a good war bow in the MR pattern, it's too heavy.  The hand shock will rattle your teeth.  One of the reasons why yew is preferred is due to its light weight.  Black locust was used by a guy from Africa to make some warbows, I don't know if the wood he called Black Locust is the same that you have in Spain. 

On Primitive Archer, on the English Warbow forum, if you ask, there are several bowers who make warbows of alternate woods, they should be able to help you.
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Re: Mary Rose warbow profile
Reply #9 - Mar 30th, 2013 at 4:32pm
 
In addition to going on PA and asking, I found this thread very helfull when it comes to ELBs from other woods. http://www.primitivearcher.com/smf/index.php?topic=8287.0

However, Keep in mind those are normal weight bows, 40-70lbs. War bows are under a fair bit more stess so your options are more limited.
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Re: Mary Rose warbow profile
Reply #10 - Mar 31st, 2013 at 2:22pm
 
Hi

The Black Locust that we have here is Robinia pseudoacacia.

We have too a lot of Acacia saligna, but I don't know if it's good for bows. This tree grows crazy wild everywhere.

Here is a Warbow blueprint. I'm not sure if it is a Mary Rose type. But if I am not wrong, the dimensions match well the ones from the average MR bows given before.

...
http://www.primitivearcher.com/smf/index.php/topic,34693.msg457464.html#msg45746...

As most woods aren't so good for a self bow as yew. I've read that the best cross section for a white wood warbow is with a  flattened belly to withstand compression, better than the famous "D" section.

Greetings.
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Re: Mary Rose warbow profile
Reply #11 - Apr 2nd, 2013 at 3:49pm
 
Well... Eastern Red Ceder with hickory backing can be made into the same shape as yew, but is not as tough... However, it looks pretty dang awesome.
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