Just How Powerfull are Deltas *With a Twist*
- Thread starter StevenG
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you'll likely end up with a borked delta 
that video, is that really how loud they are, cause thats like a tractor...and regardless of how fast somethings spinning, it needs another key componant, mass, do the maths for yourself 
that video, is that really how loud they are, cause thats like a tractor...and regardless of how fast somethings spinning, it needs another key componant, mass, do the maths for yourself Gashman said:
And how exactly are you getting accurate representation with your audio system of what the Delta sounds like in real life? Do you have a sound pressure meter and adjusting the volume until it reaches 59dB on the meter at your listening position?
Gashman said:you'll likely end up with a borked delta
Don't you mean torque or force?
Massive Attack said:
I would do that but the fan cost me almost £40 so i dont really want to get carrot over it.
I will get round to uploading a vid of delta's newish 120x38mm screamer that pushes the same amount of air but is much louder than the 76mm.
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HEHE thanksBigstan said:I have a 120mm Delta kicking around somewhere. If I remember in the morning, I'll hook her up and find an assortment of goodies to test it on
Stan
Fair enoughlay-z-boy said:I would do that but the fan cost me almost £40 so i dont really want to get carrot over it.
I will get round to uploading a vid of delta's newish 120x38mm screamer that pushes the same amount of air but is much louder than the 76mm.
Paramount said:
no because torque is rather irrelivant when the object (i.e. ones finger) will stop it outright, so lets forget torque, i mean think about it, it just doesn't work, you finger is too tough for the fan to move sufficiently. momentum is the important word, i.e. how many revolutions the fan is doing and how it translates into real velocity, the most important thing next is MASS, without mass a fast moving object is rendered useless, like comparing shooting a marble at 100m/s and hitting something with a car at 10m/s, the car inflicts seriously more amounts of damage though its moving slower, thats the effect of mass, sorry but theres no way in hell a delta would have sufficient momentum to seriously harm any part of your body barring perhaps an ear or some other soft tissue, but even then it would likely be superficial flesh wound. lets do a comparison shall we?
momentum = mass x velocity
so if the fan from a delta weighed 15 grams for instance and it was travelling at 10 m/s (unlikely) it would work out as:
momentum (P) = 15 x 10
= 150 or 150g*m/s
= 0.15kg*m/s
and that is weak when you compare it to getting hit by a paintball gun:
momentum = 3.5 x 60
= 210 or 210g*m/s
= 0.21kg*m/s
and do paintball guns kill you or tear off bodyparts, even though they pack more kinetic energy when they hit you?
You seem to be ignoring the area hitting you, it may be about 0.21kg*m/s per cm^2 for a paintball but it is probably less than a tenth of that hitting your finger. So closer to 1.5kg*m/s per cm^2 for the fan blade.
And a paintball hitting anywhere without protection can cut.
And a paintball hitting anywhere without protection can cut.
Can we put that to the test and watch you put your little finger into a delta fan spinning full on speed?
Needs to be recorded on video.
My akasa ambers hurt when I catch my finger in (not long lasting pain, certainly makes you jump though) My Panaflo hurts a lot more. And that isn't a patch on the speed of the fastest deltas.
I'll tell you for sure the spinning area of the Delta fans is a lot more than 15 grams. My panaflo weights a good deal more than my phone. Which is a 100grams.
edit:
+ what raikiri just said
Needs to be recorded on video.
My akasa ambers hurt when I catch my finger in (not long lasting pain, certainly makes you jump though) My Panaflo hurts a lot more. And that isn't a patch on the speed of the fastest deltas.
I'll tell you for sure the spinning area of the Delta fans is a lot more than 15 grams. My panaflo weights a good deal more than my phone. Which is a 100grams.
edit:
+ what raikiri just said
Raikiri said:
indeed the surface area is important, but the amount of energy is the biggest factor, but if you take into consideration its very concentrated with a fan, fair enough, a cut, but big deal, its not gonna kill you or seriously hurt you. i got shot at less than a metre in the shoulder twice with a paintball gun without any skin penetration at all, so its not certain its gonna cause any damage. plus if you get hit in the finger with a paintball round and it bursts (the round stops as well) it has dissapated all of that energy into your finger, same with a fan blade except the impact area is slightly more concentrated, with the amounts of kinetic energy were dealing with its pretty irrelivant to take into account the reduction in surface area, i mean it would have to be a torque motor (which i don't believe they are, or they'd likely cause your PC to wobble) and have a very very very fine leading edge, if the blade was mono-molecular then your in trouble
lets compare something else, assault rifle round (very sharp) shotgun dear slug (very blunt) i bet at close range even though its completely blunt the deer slug will blow a hole in you where the assault rifle will do far less damage
sharpness doesn't always make a differencebut lets just lay this to rest, you can't cause any 'serious' injuries with a PC fan?
Edit: and sorry theres NO way you panaflo 'BLADES' way 100 grams, not a chance such a little fan holds a blade made of lightweight plastic that weights a tenth as much as a bag of sugar
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VeNT said:
Exactly, like comparing hitting your thumb with a hammer and a knife. The knife will cut it off (or at least to be bone, which bloody hurts
) whereas the hammer, much like the paintball may cause minor cuts and bruising even if they both weigh the same and are both travelling at the same speed.Gashman said:
Serious, no. But fairly deep cuts would certainly be possible imo.
give the delta a metal set of blades and it might take a chunk out of your finger, there you go, it'll cause some damage, but is it serious? bearing in mind i have fractured my skull, broke my knee cap in half and had some chunks of flesh lost and non of them caused my any serious harm
TFB 120mm
http://www.youtube.com/user/1tothe2the3
should be on there soon, i dont really understand youtube, if i upload it, why does it say it still needs to be uploaded?
http://www.youtube.com/user/1tothe2the3
should be on there soon, i dont really understand youtube, if i upload it, why does it say it still needs to be uploaded?
are they made by satanists or something?I want one!!lay-z-boy said:TFB 120mm
http://www.youtube.com/user/1tothe2the3
should be on there soon, i dont really understand youtube, if i upload it, why does it say it still needs to be uploaded?
I'm not too bothered about the noise and i wouldn't mind one of them on a fan controller.
I was also wondering what it would be like with two of those dual ones at the back of my gigabyte aurora. I fear they may end up being too big and won't fit, plus they cost a bomb.
Gashman said:
Actually if the ball bursts most of the energy is used to burst the ball. Hence the reason a paintball that doesnt burst is actually a lot more painfull than one that does.
A delta blade could seriously hurt you and at least hurt you badly.