Arrow weight and Trajectory

[matt61]

Can anyone tell me how much arrow drop would a fifty
grain heavier arrow have over twenty meters approximately.
I had a pundit tell me onetime that a twenty grains heavier arrow
would drop eight inches more over twenty metres which
sounds excessive.
cheers
Matt

[kimall]

Bit tricky to say outright as many things affect the arrow flight like if the weight is over the full length or just the tip as I have found to a point heavier tips can make the arrow shoot higher.Over the whole length 50 grains is not even noticable as far as drop goes with my set up over that distance 30 mtrs seems to be were the drop really starts.
Cheers KIM

[ed]

easy way to know is to shoot some of the old arrows and some of the new at 20m using the same aiming point - be surprised if it was more than a couple of cm's

[GrahameA]

Evening All.

Can anyone tell me how much arrow drop would a fifty
grain heavier arrow have over twenty meters approximately.
I had a pundit tell me onetime that a twenty grains heavier arrow
would drop eight inches more over twenty metres which
sounds excessive.

It is not hard work out. However a complete set of information is required. Essentially the question revolves around the time of flight and that is directly related to the arrow velocities. The faster the arrow the shorter the time of flight and the smaller the variation between the two.

What are the arrow velocities of the two arrows? If you do know that that then if you know the total mass of one arrow and its velocity you can approximate the velocity of the other. You can also assume that there will be negligible change in velocity over the difference.

[Chase N. Nocks]

There are a number of archery software products that will help working out this type of information.

eg. http://www.pinwheelsoftware.com/ but there are others and some I have found on the net free

eg. http://www.outdoorsden.com/archery/archbal.asp

I don't currently own one but as Grahame says there are certain values that need to be submitted to work these things out.

Also considering the variables involved with finger release (all else being equal ie arrow weight) I think working on averages for arrow speed would be you best indicator.

It's an interesting question that I have been thinking about lately especially in regards to gaping and even string walking...with string walking you have the added complication though of trying to find the best compromise for spining your arrows...

Cheers