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Posted:to what extent is it important for a devilstick to be tapered? if a devilstick spins too slow or is too diificult for direction changes, would adding weight to the centre of the stick help? Or rather, adding weight between the centre and the ends of the stick... I a going to try to develop my own LED-illuminated devilstick, since none of the stuff being sold today satisfies my needs for a fast-spinning yet controlable stick...
Carpal \'Tunnel Location: Hampshire College, MA, USA
Total posts: 3533
Posted:It's not integral, which is why flowersticks aren't tapered. It mostly just helps with the weighting. Adding weight anywhere wouldn't help, you'll want to make it lighter if you want it to go faster. The heavier it is, the slower it will go, weight on the ends just has more impact.
"How do you know if you're happy or sad without a mask? Or angry? Or ready for dessert?"
Posted:well, the stick i was referring to already is very light...i can get it up to speed with some effort, but direction changes, like swordfights, are nearly impossible...i am quite surprised by the fact that weight distribution doesn't affect a stick's handling...
big and good and broken Location: lunn dunn, yoo kay, United Kin...
Total posts: 7330
Posted:the distribution of mass along the length of a rod (stick) does affect its handling since it changes the rod's moment of inertia.
by tapering a devilstick, you distribute more of the mass towards the ends - this increases the stick's moment of inertia.
this has the effect that you need to apply a greater torque to accelerate the stick.
or in simple language, the tapering helps to make the stick more controllable by increasing the force you have to apply to the stick to change its speed.
without the tapering, a small tap on one end of the stick would have a much larger effect on its speed of rotation - it would feel very light and 'delicate' in that you would have to be very accurate in your manipulation of the devil with your handsticks and use a much 'softer touch'
so in summary: a non-tapered devilstick would go from stopped to spinning really fast with a lighter tap than a tapered one would need but it would also be much harder to control overall.
a non-tapered stick can be given similar rotational properties to a tapered one simply by adding weight to the ends.
and conversely, if you want to make a spin faster with the smae amount of 'effort' from you, simply add weight to the centre of the stick
hope that helps,
"i see you at 'dis cafe. i come to 'dis cafe quite a lot myself. they do porridge." - tim westwood
member Location: Currently nr Salisbury, but oc...
Total posts: 30
Posted:but bluetack holds the universe together...
it's sometimes called white tack, it's a slightly sticky gum that you can mould into shape, used mostly to stick posters to walls in my experience. it doesn't set hard, but can stain some things blue after a while, which is why white tack is useful. and it's squishy.