Problem with laminated hungary bow

[kamil2910]

Hi
I have problem with my new ipe-maple sinew horsebow
After I first stung bow, with maple and ipe ,glue go delaminate, Make a 2 mm crack,Crack make at the end of grip to bending arm.
I made a longbow with epoxy glue Polish epidian 5 and bow be good, dont have any problem,What is best glue for that composit horsebow?

[redhawk55]

Any pics of the crack?
I don' t think ipe/maple mix to be a great choice.
Michael

[kamil2910]

I dont have a photo because i glue thys delaminte with cyjanoakril
What you mean if maple and ipe its bad combination with sinew???

[PatM]

Did you copy that off my sinew along? It looks uncannily similar.
 The combination is fine but you can't nor do you need to reflex it that much.
 I would try again and scrub the Ipe down well with soapy water before gluing it up.

[kamil2910]

No i dont copy youre ipe sinew laminate,I start making thys bow in july I tomorrow, more scraped belly of bow, lose from draw weight,
at that moment bow go to 90-100 lbs at 28 inch
 and I go to tiller,

[PatM]

Remember the originals show evidence of wrapping at that point. It's a highly stressed area.

[bubby]

might want to post this in the hornbow section

[PatM]

But it's not a hornbow and the hornbow guys are adamant that this style is a waste of time in wood.

[Tommytinker]

Do you think it's a waste of time Pat?

[PatM]

Of course not, I am the biggest proponent of this style. There is just no need to try for a very high degree of reflex.
 The reflex in a horn bow is to strain the materials to get the most out of them. You don't have to do that with wood.

[Tommytinker]

Ok, I think I might give it a go, got some nice ipe left and plenty of sinew. What wood would you recommend for the core?

[bubby]

But it's not a hornbow and the hornbow guys are adamant that this style is a waste of time in wood.




your right pat I missed that

[blackhawk]

With that much reflex you'll likely exceed the elasticity limits of the wood.....been there done that....like pat says don't put in as much reflex on the next one.

[mikekeswick]

Major stress at that point. Wrap it next time before bending.
So much reflex is a waste of time. Aim for the tips to sit maybe 4 inches ahead of the grip.

[PatM]

Also balance your reflex through the materials. Glue in a little bit with the wool lams and then a bit more with the sinew.