Talk:Projectile

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 * what with the "heavy object" in the table under "Typical projectile speeds" ? doesn the weight have anything to do with the speed ?


 * No it doesn't -- I'm changing it. Zorath 15:07, 17 July 2006 (UTC)


 * Was the heavy object for something falling? if so would that mean "ignore air resistance"? raptor 02:42, 16 August 2006 (UTC)


 * "ignore air resistance" We can't possibly ignore them any longer, they're growing more and more radical each year, sending shock waves through the fabric of our community and sucking the wind from our sails. Eight years have passed since your comment and the "Air Resistance" have made cunning strides to derail our forward momentum. oh sure they started out slow with operation D.R.A.G. which was quickly blown away by the passing of Stokes' law and we thought all of those threats that Gusterson made were nothing but hot air but they weren't; Wind shear, Ram pressure, TERMINAL VELOCITY...need I go on?! --Rpm2004 (talk) 07:03, 25 September 2014 (UTC)

A question concerning kinetic weapon destruction
I am writing a hard SF novel which postulates a 12 gram object propelled at near relativistic speeds==10% c. Could anyone give the kinetic energy transfer involved in joules? I need to get a handle on the destructive power of such a weapon. Are we speaking of a planet-buster?

Regards, Scott


 * Wikipedia really isn't the place to be asking this. This is an encyclopedia, not a message board. Zorath 08:00, 22 April 2007 (UTC)

Uncertainty in the definition
Once it's said: A projectile is ... propelled ... by ... a force which ceases after launch. Then: Some projectiles provide propulsion during (part of) the flight ...

The second statment seems to contradict with the very definition provided here. I mean if it is true, we don't have a definiton. Or is a projectile an "object propelled through space"? I really don't know. —Preceding unsigned comment added by 91.120.159.249 (talk) 23:32, 14 June 2009 (UTC)


 * I fixed it.--Patrick (talk) 10:47, 14 May 2010 (UTC)

Speed
forgive me, not sure I am doing this right and never thought I would add anything to Wikipedia, but the speed of a 4.5mm projectile is listed as 492 ft/s but if you look under http://en.wikipedia.org/wiki/List_of_rifle_cartridges all the .17cal rounds have velocities in the 2100-4000 ft/s range witch seems more believable than 492 ft/s. Biggie Triangles. —Preceding unsigned comment added by 71.164.120.84 (talk) 02:22, 14 May 2010 (UTC)

Many things are wrong in this table — Preceding unsigned comment added by 96.249.9.81 (talk) 07:53, 19 June 2012 (UTC)

Clay balls
Clay balls have also been used as projectiles; the museum in Mukdahan Tower has on display bows used to fire them. I once read of an archaeological find in the Middle East of a store of clay projectiles, though likely used as sling ammunition, rather than fired from a bow. --Pawyilee (talk) 15:41, 4 October 2012 (UTC)
 * Added it under See Also Living Systems--Pawyilee (talk) 09:35, 5 October 2012 (UTC)

Typical projectile speeds
What are the sources of this table? To calculate total kinetic energy we have to multiply specific kinetic energy times mass - only mass is never provided, and when it comes to projectiles - total kinetic energy is the one that matters - so either provide masses, or provide total kinetic energy. And finally: This article is really, really horribly sourced. 86.148.237.192 (talk) 13:03, 26 May 2014 (UTC)

Original research
I have concerns about the dearth of sources in this article. In particular, as expressed in the first and third sections above this one, the Typical projectile speeds" section has insufficient sources or information to verify the figures and calculations and is believed to be inaccurate. (I have accordingly added a disputed tag to that section as this concern remains unaddressed six years later.) In addition, the article may contain original research, particularly regarding the unsourced terminology. – Laundry Pizza 03  ( d c&#x0304; ) 20:24, 22 December 2018 (UTC)