I agree with Pat. Cue elevation is required on some shots (e.g., if bridging close to a rail, or if the bridge length is not very long), and it might help some people get more draw action (due to explainable factors), and it can certainly help with
quick draw, but there is no advantage to adding elevation on a straight-back draw shot.
For those interested, this topic is covered in detail here:
draw shot cue elevation effects
Enjoy,
Dave
I generally agree with these statements, but there's a little trick I was taught years ago to get maximum draw on a long shot - and it does require a little angle. It's unclear if the results are dramatically different, but I suppose Dr. Dave can run an experiment to find out.
Theory: if you shoot perfectly level, the cue ball slides all the way down the table to the object ball losing rotation the whole way. If you have a little angle (not like a jump shot, more like shooting off the rail a slight, but existing angle) - the cue ball hops down the table with less frictional loss. So, when it hits the object ball, it has [might have / may have / ?] more spin than a "flat" draw shot. Interestingly, Dr. Dave's link [above] states that the cue ball hops down the table. This is precisely the effect you are looking for to maximize draw.
For example, if you watch virtually any power draw shots on youtube, the most extreme versions all have cues with some angle.
Here is Mike Massey's shot. It's lower resolution, but you can kind of make out the cue ball hop.
https://www.youtube.com/watch?v=3GsRIPSTWfo
Dr Dave version:
https://www.youtube.com/watch?v=59amcNEN0Tg
Chris Capp:
https://www.youtube.com/watch?v=bqCPqYJ30zo [you can see the obcjet ball hop in a couple shots, which [arguable means the cue ball hit it above center]
Corey's draw shot has him shooting with even more angle and you could make the logical leap that ball is hopping without much dispute.
https://www.youtube.com/watch?v=bqCPqYJ30zo
So, despite the common wisdom (which I believe) that draw shots should be hit as level as possible, it appears that there are certain situations where it is beneficial to have a slight angle. I haven't seen anything to the contrary, but I admit that I also haven't seen anything the illustrates the angle has any measurable benefit.
If there is a mathematical reason why hopping down the table reduces draw, I could be easily persuaded. But my quick / common sense approach is that less friction, with the same rotation equals more draw.
[NOTE: I know most will believe that the cue ball is not hopping down the table. But you can put a line of dimes in front of the ball (starting maybe 3 inches away) and you will see that it is hopping quite a ways before it hits the first coin. I'll try take a video or two tonight to illustrate.]
-td