WORLDS BEST BOW CORE ?

[@russparker1647]

Very, very interesting. The foam is surprisingly poor. Won’t think about that again. Would you share the source of the laminated birch? Thinking of making a super recurve with bias ply carbon back and belly and bamboo core. Would feel more confident with the birch.

[@DLB1858]

I didn’t think bow failures is due to core. I’ve made bows out of Douglas fir as a core. Fine shooting bow @65#. Some hand shock because tips are a little light. Been shooting it for 15years now

[@ripfletching]

I agree with you on the most part, but I have seen core failures when using carbon back and belly the extreme pressures between the two surfaces can tear materials. We’ve done a lot of testing and it does occur but correct in a normal bow limb configuration. It’s probably not a big deal. I have also noted that the foam cores will gas out over the years and become brittle.

[@TheJustinJ]

You remind me of Mike Musto. (Big Muscle car show a decade ago on YT).

[@TheJustinJ]

It would seem that bow limb cores must resist bending as much as shear.

[@ripfletching]

Lol thanks… I think

[@ripfletching]

@@TheJustinJ Core material receives many different types of pressure from the two surfaces that contact it when pulling one pushing sliding opposing each other and also the flex does occur and in some brittle materials as the age they can fail such as syntactic foam

[@bentpolski]

ripfletching is that Stained Birch what is known as Actionwood?

[@ripfletching]

Yes and no it’s been put together a certain way for us

[@tmoanpumba5487]

Bending like you did really shows nothing, you need to show the actual shear tests to be accurate.. To prove my point, do that same test to uni carbon vs glass.. The glass will be stronger but does that mean its superior to carbon?

[@ripfletching]

tmoan pumba You’re right I need to put together another series of tests thanks!!!🤠 But as you know you can take the fiberglass in the carbon and flex them if they are the same thickness the carbon will be much harder to 💪 flex . Also something I did not state the new core uses much less thickness as the other cores due to its increased strength and rigidity. Thanks for your idea 💡

[@ripfletching]

Yes we do test all of the products in a sheer test I was merely showing the strength and fragile Ness of the materials One of the materials used does have carbon in it in the test and you’re correct fabric glass is much more flexible than carbon good carbon is rigid with very low Apoxsee count I like a high modulus carbon but we have noticed syntactic phone has a tendency to fail due to its brittleness especially after syntactic from ages it becomes much more brittle

[@ripfletching]

Thank you for watching and for your opinion

[@tmoanpumba5487]

@@ripfletching There is tons of different syntactic foams and resins used.. Its sheer strength is what counts, not how flexible it is. In that test you did to make it fail, have you ever seen a limb bend more than 45 degrees in a 4 inch length? It also depends on the layup you use and in what combination.. You want to know what is a better buying point on a bow? Warranty, if the products are as good as you think they are, why no 10-20 year warranty? Or even lifetime?

[@ripfletching]

@@tmoanpumba5487 I completely agree problem with extended warranties you don’t know the care given to the bow overtime many people store their bows in their hot vehicle or in their garage and this will destroy!!!

[@My_Bow_L.Y.F]

Can you make custom limb parts? Pl ee's ase let me know thank you for your channel.

[@ripfletching]

Get a hold of Arvid at Black Swan archery

[@My_Bow_L.Y.F]

Thank you so very much. I will get in contact with him shortly

[@foolwise4703]

I feel a little tricked coming here with a clickbaity title of "the best core material" and all I get is a commercial advertising "our patented core" without even a hint what the heck that core is, except promises of how great it is. If it is patented, why be all coy about it? If you make a video about it, please actually give information!

[@ripfletching]

Thank you for your interest. It has vertical stacked carbon in the lamination process. It’s extremely expensive to produce, but builds a bow that is amazing, and very tough the cost of production in building a bow laminate like this is so extreme we’ve gone back to bamboo purely because of the cost of production. But it is clearly the best bow core in the world.At this point

[@Dr._Spamy]

I don't like to have "product" as a core.

[@ripfletching]

We’re back to using bamboo now, but it’s hard to find the quality of bamboo that it takes to use with carbon but I agree with you

[@Dr._Spamy]

@@ripfletching Oh, never mind, it's just the wording I didn't liked. Even in germany people cought this as a trend now and everything becomes just "product", without even telling whatever it might be. ;)

[@marcThespazz]

You have zero clue on how to test a laminate for bow strength.. You need to test sheer strength.. not flex strength.. .. The way you are stating it, a solid carbon laminate would be the best core, but it isn't. You just wasted our time.. There is more than what you are showing to a good core.. How about if you have the best materials and cores, What is the warranty on the bows you are talking about, should they not be 30 years if they are so strong? Should the warranty hold up ?

[@ripfletching]

We do test, sheer strength, building bows since the 60s

[@marcThespazz]

@@ripfletching How long is the warranty to these superior core limbs then?

[@ripfletching]

@marcThespazz I just test the bows. I do not build them you would need to get with Arvid at Black Swan archery.

[@SharpObserver1A]

In real life bow cores won't bend that sharply, wake -up. a core task is to keep the back and the belly separated. Period.

[@TheJustinJ]

From beam theory, its job is to resist shear. Both transverse and axial. Bending stiffness is just a benefit. As all shear webs are.

[@rapido4665]

The only bows I know of that uses syntactic foam are asian Manchu bows, where the foam is used to STOP the part from bending. The very long ends of these bows are so called non working siyas, and in that application syntactic foam is superiour to other core materials because of its very low weight. The foam used is thick, because the bigger the distance is between the outer glass or carbon layers, the stiffer the part becomes. And low weight at the bow tips increases the snappyness of the bow. I do not think a knowledgeable bowbuilder would use syntactic foam in the bending limbs of a bow though.

[@DLB1858]

@@rapido4665 I think my takeaway from your comment is….don’t attempt to make Manchu bows. I’ll stick to simpler designs. Thanks for the explanation, although I didn’t thoroughly understand it