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.
when you do the math on the figure showen on 5.2-1 it shows less drop than either the dropXcosine and distanceXcosine
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 inches-X=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.