Why does K'nex ammo spin out?

I shoot yellow rods, green rods, blue rods, Oodammo, you name it, and they all are unstable and spin out. WHY IS IT SUDDENLY DOING THIS? It's really bothersome, it's messing up my aim and makes my gun looks bad. I have tried fins, but they only work at short distances. I'm only using 4 #64 bands on a black rod hammer, but why is it so unstable?

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fins should look like this
i first wrap a layer of tape around the rod
then i fold a piece of tape leaving the ends to attach to the rod on the layer i just taped on
i tape then as pictured making sure they are evenly spaced and at a correct angle
then i tape from one fin to the other to add a stiffening layer
so right now the fins should be different heights and uneven looking which is ok cause you cut them to size
but first add a piece of tape the the leading edge of each fin so that the leading edge is smooth and strong
now just cut them down to the size i have pictured and your fin ammo should be shooting perfectly straight and forever far with the right gun an bands
i use gold rods which r similar to red rods for the shaft
the gold rods have a line which is where you should start the fins
unfortunately the picture isn't shown with the gold rod lol
prodo123 (author)  Knex Lego Maniac6 years ago
Nice, I don't have gold rods though...
I usually make the fins like that, then cut them at a slant so they look more aerodynamic and arrow-ish.
gold and red rods are practically the same thing
don't slant em you need the surface area and it is hard to keep the slants even which if uneven will throw off the accuracy of the round
My fins don't work at all! They actually STEER the bullet away from the target
Or in any direction. I need somebody to help with the fin problem,
As everybody gets 50 ft extra with them when I get 50ft less with them.
Give every fin an identical slant to one side (say, when you stand the ammo up on end, and look at one fin, it is leaning 5 degrees to the right - turn the ammo to look at the next fin, and that will also be leaning 5 degrees to the right).

This will make the ammo spin on its long axis, improving stability and accuracy, and potentially increasing range.

prodo123 (author)  Kiteman6 years ago
I personally sharpen mine in an electric sharpner to make grooves from the sharpening process for the same effect. The fin method could be difficult to accomplish, since the best spin-to-stabiliy ratio is when the fin is pointed at the corners of the rod.
But, since you said in the opening topic that your ammo is spinning out, maybe this sharpening isn't enough?

prodo123 (author)  Kiteman6 years ago
The reason why most rods spin out is because:
a. Their flight pattern is shaky
b. Too much force is applied off-axis during firing
c. Shaky posture while firing
d. Bad gun/ammo
e. Weight balance issue
f. High resistance to air

Oodammo solves the weight balance issue with a heavy tip. It is still unstable. Normal rods are less balanced, more unstable and has a low tolerance for off-axis impact (If the ramrod hits the edge of the rod instead of the center, it spins out). However, it's aerodynamics are much better than Oodammo and the length of the gun barrel may solve the off-axis issue.

Fins, on the other hand, when made correctly, will solve all issues except the weight balance. Tipped fin ammo are the best, but they're a pain to make.
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