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"Mantis" Slotbow - why did I not think of this before?


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Old 07-12-2015, 05:29 AM   #21
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That's awesome. I have seen 3D printers spit out all kinds of things but have only seen it do a slingshot online. It must be a treat to not only see it printed but then test it as well. 150 lbs is crazy.

Perhaps you can use the printer to make a part that allows shooting with the arrow inserted either way.
I'll work on that Dan and post photos when I have something. I'll add the second pattern that's rotated 180 degrees (a slot every 60 degrees). I had a recurve bow years ago that I made in Jr. High shop class, but I have no experience with slingbows and I'll have to order some arrows first.

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Old 07-12-2015, 06:06 AM   #22
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Six slots vs. three isn't such a good idea. The slots need to be flared in because the vanes are glued onto the shaft, and that thickens the shaft a bit. If you put on six flared slots, then the arrow guidance will be very loose.

It is actually impossible to put in the arrow the wrong way. The bands are very short (as the draw length is limited to the length of the arrow, maybe 80 cm). Therefore the arrow has to be inserted with the vanes in the slot when you nock it.


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Old 07-12-2015, 11:50 AM   #23
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If you put on six flared slots, then the arrow guidance will be very loose.
I wondered if that might be the case. Basically you are left with six pointed ends that end up too far apart to be effective (I sketched it on a piece of paper last night). The "hole" for the arrow shaft is roughly twice the diameter once done. There will be a lot of "chatter" in the best case.
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Old 07-12-2015, 12:39 PM   #24
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HE IS BACK! Love the simplicity and devastation fused in one small object! Haha now i really wanna make one Joerg!

Okay the Concept for the small shooter is proofed, lets go for a crossbow haha! It dont need to be that long, like your smallest crossbow but I wanna see metal rods propelled at oaks walls with tremodous speed!
With your easy lock and a rather open barrel system it could make a fun shooter! ..
Blaa blaa haha yes i know.. i just want to see a shooter like the M10 Hexnut rifle again, it is soo awesome to see and build such crossbows you made!

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I wondered if that might be the case. Basically you are left with six pointed ends that end up too far apart to be effective (I sketched it on a piece of paper last night). The "hole" for the arrow shaft is roughly twice the diameter once done. There will be a lot of "chatter" in the best case.
What about making a hole as big as the arrow and the feathers together, cut 6 to 8 slots and place metall brackets into them so they form a hole where the arrow shaft could be slotted in? In is sturdier than sawing into the ply that much and would do the job, maybe 4-5 brackets will do!
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Old 07-12-2015, 01:40 PM   #25
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This is an awesome idea!

"Mantis" Slotbow - why did I not think of this before? - Show off your homemades!

"Mantis" Slotbow - why did I not think of this before? - Show off your homemades!
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Old 07-12-2015, 02:16 PM   #26
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I think in the end you need a system that only has the three slots but allows you to insert the piece with the slot in your preferred direction. Ever since Jörg dropped this concept on us here my mind has been working overtime.
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Old 07-12-2015, 02:31 PM   #27
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Simple-Shot has been prototyping a slingbow for the market, this would be an excellent idea to simplify design and eliminate the need for a whisker biscuit.
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Old 07-12-2015, 05:43 PM   #28
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I think in the end you need a system that only has the three slots but allows you to insert the piece with the slot in your preferred direction.
This looks like another case where a removable forks / head slingshot design might be warranted!
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Simple-Shot has been prototyping a slingbow for the market, this would be an excellent idea to simplify design and eliminate the need for a whisker biscuit.
I'm not a slingbow shooter (yet) so please correct me if I'm wrong but the whisker buiscuit is only needed when shooting at extreme, near vertical angles, right? Chief AJ sells a slingbow with a simple flip-down rest and that's what he uses for big game hunting. It seems to me that it would work perfectly well for targets too. He also sells a whisker biscuit and claims that it is useful for shooting down at fish.
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Six slots vs. three isn't such a good idea. The slots need to be flared in because the vanes are glued onto the shaft, and that thickens the shaft a bit. If you put on six flared slots, then the arrow guidance will be very loose.
Thanks, Jörg. That makes sense. Speaking of looseness--is your three slot design tight enough to shoot straight down accurately (the hallmark of the whisker biscuit)?
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Old 07-12-2015, 06:51 PM   #29
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Quote:
Originally Posted by calinb View Post
This looks like another case where a removable forks / head slingshot design might be warranted!

I'm not a slingbow shooter (yet) so please correct me if I'm wrong but the whisker buiscuit is only needed when shooting at extreme, near vertical angles, right? Chief AJ sells a slingbow with a simple flip-down rest and that's what he uses for big game hunting. It seems to me that it would work perfectly well for targets too. He also sells a whisker biscuit and claims that it is useful for shooting down at fish.

Thanks, Jörg. That makes sense. Speaking of looseness--is your three slot design tight enough to shoot straight down accurately (the hallmark of the whisker biscuit)?
I was referring to the fact that eliminating the whisker biscuit would help keep cost down and simplify design.
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Old 07-12-2015, 08:14 PM   #30
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Simple-Shot has been prototyping a slingbow for the market, this would be an excellent idea to simplify design and eliminate the need for a whisker biscuit.
I was having similar thoughts as soon as I saw this. I was thinking that since the Simpleshot one will have replaceable upper sections, they could offer an additional upper molded in this shape. This one could just be an addition to the lineup, rather than a replacement. The biscuit attachment would still be good for those who use fletching other than the straight 3-feather/vane 120* style (4 or 5 feather/vane, offset or helical fletching, etc.).


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