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406gn

48 # , 29 “ 400 gn

Thank you, Sir! 😊 Nice work!

It was already clear that it was doing its job. But it had to be simplified.

The goal was to make a short recurve bow, the limbs of which are at a small angle. The design itself has existed for about 30 years. I tried to make it several times, but only succeeded in the last couple of years. Bow limbs consist of 3 parts: there is a bending limbs, below that is the torsion limbs and at the end of the two is the recurve limbs. These are connected to each other via hinges. The hinged solution came from a folding bow developed a few years ago. This two-story double arrangement may seem unusual, but what we're talking about here is that we've broken down the normal bow limbs into an outer tension-bender part and an inner compression-distortion part. The strength of bow limbs is usually determined by their thickness, in this case the strength also depends on the distance between the two bow limbs. The recurve part is connected flexibly, so it can turn, which is also regulated by the bending and distortion arms. This results in a complex movement, which is necessary due to the shortness of the bow limbs. The angle of the bow limbs is unusually small and flat. This wouldn't normally give you a fast bow, but because of the double lever mechanism, there is an extra speed that brings it back to a good level, even.. Why is this arrangement and size important? The larger a recurve limbs, the greater its inertia and the greater the kick of the bow limbs. This is further enhanced by its almost vertical position. In general, most recurve bows are like this. The situation is different with the Locust Crab, where the limbs are divided into 3 short parts. It's light and has a flat angle. In the case of long-range "fligh shoot" bows, we observed that the recurve bow only shoots a light arrow far if the bow limbs are very short. There is only one problem, the short draw length. With the Locust Crab, this problem does not exist, there is a sufficient pull length, 29.5" for one version and 31.5" for the other version. However, it also works with a very light arrow, does not resonate, is not damaged, and does not lose its effectiveness. The reason for this is an interesting physical phenomenon, if we increase the strength of the bow or reduce the mass of the arrow, the efficiency of the bow will decrease to a great extent, because the arrow suddenly receives a big energy boost and the bow limbs and string cannot follow the arrow. Because it has a large size and a large mass. The short, light arms, on the other hand, accompany the arrow all the way through and maintain very good efficiency and there will be no vibration in the grip. At Locust Crab, the tiller can be changed in 3 ways: - With the tiller screw at the end of the bending limb (number 2). - The Bumper screw under the adjusting roll (number 1) - With a caterpillar screw at the end of the torsion limb (number 3) and the recurve limb. In addition to the tiller, the distance of the double limbs can also be changed. This distance is a little more at the bottom than at the top. There is a very small "let off" feeling when tensioned, but it is not like a compound bow. If the roller hits quickly, then the "let off" feeling is better, if later, then there is a tighter feeling at the end. It is most ideal if there is 4-5 mm between the edge of the roller and the riser. This distance changes when you move the tiller screw and change the strength of the bow, because when you open it, the angles also change. That is why there are smaller and larger rollers that can be changed. If you don't change the rollers, the bow still works. It will be softer with larger rollers, tighter with smaller ones. The development of reflex bows in the modern age is an interesting thing, because in the 1930s and 40s a recurve bow was developed that had a relatively large and strongly recoiling recurve with short limbs. This direction changed after 1947, especially from 1953. Bows have a longer arm and a shorter ski-like recurve end. This is because materials have been simplified to make them more mass-produced. UD Glass laminate does not have a high torsional resistance because it only consists of parallel glass fibers. However, in the 1930s and 1940s, composite materials with higher torsional resistance were produced in small series, so they could produce recurve bows of very effective sizes and shapes. I would just like to note that when I made the glass laminates for my bows myself in the late 80s, I still made the bows with the long and wide angle recurves. I bought the UD glass laminate later and the bows started to twist, so I used shorter recurves. In recent years, I returned to the materials I developed myself and this again created the opportunity to design very effective bow shapes, such as the double limbs bow. It's interesting that the design and form itself has existed for decades, I just had to find myself and at the same time do a little time travel and go back in my mind to the branching point when the development of the two types of recurve bows diverged. I feel like I managed to go back and continue on a different path.

@@csabagrozer7557 ok that was a very good explanation thank you. I didn't follow all of it but got the main strokes. I'm having issues just making a simple two part takedown bow so for now I'm just trying to perfect my one piece bows to the point they can draw to 32 inches without stacking. I make Asiatic bows from fibre glass blanks. Good luck with your endeavours it's cool to see new/old stuff being made especially when they serve a purpose. As an engineer it's always form follows function for me and usually when I find the right way it ends up looking ok too.

I just watched the video again with your explanation in mind and it made more sense now 👍

There is only a small letoff. But it also depends on the setting.

@@csabagrozer7557 Could you please publish a draw force curve.

Locust Crab - Double limbs recurve bow The goal was to make a short recurve bow, the limbs of which are at a small angle. The design itself has existed for about 30 years. I tried to make it several times, but only succeeded in the last couple of years. Bow limbs consist of 3 parts: there is a bending limbs, below that is the torsion limbs and at the end of the two is the recurve limbs. These are connected to each other via hinges. The hinged solution came from a folding bow developed a few years ago. This two-story double arrangement may seem unusual, but what we're talking about here is that we've broken down the normal bow limbs into an outer tension-bender part and an inner compression-distortion part. The strength of bow limbs is usually determined by their thickness, in this case the strength also depends on the distance between the two bow limbs. The recurve part is connected flexibly, so it can turn, which is also regulated by the bending and distortion arms. This results in a complex movement, which is necessary due to the shortness of the bow limbs. The angle of the bow limbs is unusually small and flat. This wouldn't normally give you a fast bow, but because of the double lever mechanism, there is an extra speed that brings it back to a good level, even.. Why is this arrangement and size important? The larger a recurve limbs, the greater its inertia and the greater the kick of the bow limbs. This is further enhanced by its almost vertical position. In general, most recurve bows are like this. The situation is different with the Locust Crab, where the limbs are divided into 3 short parts. It's light and has a flat angle. In the case of long-range "fligh shoot" bows, we observed that the recurve bow only shoots a light arrow far if the bow limbs are very short. There is only one problem, the short draw length. With the Locust Crab, this problem does not exist, there is a sufficient pull length, 29.5" for one version and 31.5" for the other version. However, it also works with a very light arrow, does not resonate, is not damaged, and does not lose its effectiveness. The reason for this is an interesting physical phenomenon, if we increase the strength of the bow or reduce the mass of the arrow, the efficiency of the bow will decrease to a great extent, because the arrow suddenly receives a big energy boost and the bow limbs and string cannot follow the arrow. Because it has a large size and a large mass. The short, light arms, on the other hand, accompany the arrow all the way through and maintain very good efficiency and there will be no vibration in the grip. At Locust Crab, the tiller can be changed in 3 ways: - With the tiller screw at the end of the bending limb (number 2). - The Bumper screw under the adjusting roll (number 1) - With a caterpillar screw at the end of the torsion limb (number 3) and the recurve limb. In addition to the tiller, the distance of the double limbs can also be changed. This distance is a little more at the bottom than at the top. There is a very small "let off" feeling when tensioned, but it is not like a compound bow. If the roller hits quickly, then the "let off" feeling is better, if later, then there is a tighter feeling at the end. It is most ideal if there is 4-5 mm between the edge of the roller and the riser. This distance changes when you move the tiller screw and change the strength of the bow, because when you open it, the angles also change. That is why there are smaller and larger rollers that can be changed. If you don't change the rollers, the bow still works. It will be softer with larger rollers, tighter with smaller ones. The development of reflex bows in the modern age is an interesting thing, because in the 1930s and 40s a recurve bow was developed that had a relatively large and strongly recoiling recurve with short limbs. This direction changed after 1947, especially from 1953. Bows have a longer arm and a shorter ski-like recurve end. This is because materials have been simplified to make them more mass-produced. UD Glass laminate does not have a high torsional resistance because it only consists of parallel glass fibers. However, in the 1930s and 1940s, composite materials with higher torsional resistance were produced in small series, so they could produce recurve bows of very effective sizes and shapes. I would just like to note that when I made the glass laminates for my bows myself in the late 80s, I still made the bows with the long and wide angle recurves. I bought the UD glass laminate later and the bows started to twist, so I used shorter recurves. In recent years, I returned to the materials I developed myself and this again created the opportunity to design very effective bow shapes, such as the double limbs bow. It's interesting that the design and form itself has existed for decades, I just had to find myself and at the same time do a little time travel and go back in my mind to the branching point when the development of the two types of recurve bows diverged. I feel like I managed to go back and continue on a different path.

Thank you! Yes . grozerarchery.com

Okayyyyyy

Oh my god, this is a weak attempt at provocation. I make 50-60 different bow models.But only 2 model of them have screw reinforcement, but these are the best. Maybe in the future I will put screws,....6 pieces in all the bows .

Most adhesives make the tendon brittle when it dries. The point is that the glue must be consistent with the sinew. It is a mixture of several colloidal substances.

So after experimenting the modern materials in several ways it turned out that the old natural materials are the best!!