Quote:
Originally Posted by rcdinaz
Load thanks for the cannonball example, I found some similar analogies to satellite flight/launch and a golf ball example. I think I am on the same page and looking at the Sierra link (below) we can still pretty much assume gravity is a negligible based on it being constant (9.8m/s). I think I was confused more by semantics... time of flight vs gravity. As you mentioned there is some difference in the theoretical realm especially at extreme angles of 90 deg & 180 deg but am I correct that for trajectory calculations most will use it is not really a factor?
Sorry to beat a dead horse on this still trying to make sure I have a proper grasp on this topic. I am rally looking at this trying to determine at what ranges a rifle mounted angle indicator starts to reach its limit on usefulness and if there are any possible errors/assumptions to be aware of in most of the ballistics programs out there.
It has been over 20 years since I had to actually do the math and the trig and calc equation make my head hurt.
exterior ballistics

when you do the math on the figure showen on 5.21 it shows less drop than either the dropXcosine and distanceXcosine
from sierra
Increase in
Elevation Angle Bullet Path Height
+/ 5 degrees .004 d inches
+/ 10 .015 d
+/ 15 .034 d
+/ 20 .060 d
+/ 25 .094 d
+/ 30 .134 d
+/ 35 .181 d
+/ 40 .234 d
+/ 45 .293 d
+/ 50 .357 d
+/ 55 .426 d
+/ 60 .500 d
which is (drop in inches x d)=X (drop in inchesX=adjusted drop)
three differnet equations three seperate sets of #s
(this one is about 1/2 minute less than drop x cosine) blob would call this one unacceptble also.
bottom line just get out and shoot. without verifying all the math in the world will still end up in a miss
i use the ipod/bullet flight fte method myself
it works however yet again isn't perfect.