I know almost jack about physics and poles

- but there must be a whole lot of 18 and 19' vaulters that don't since I have seen a whole lot of Spirits used at that level

- not to mention Pacer's

- Are you implying that all flex numbers are not created equal - no jack - I think there has been plenty said on these boards about that - as far as the target market for a certain pole family and design - that is a manufacturer decision - there is a reason the Skypoles roll over easier for the same flex - Have not jumped on Essex so can not talk about them - Have coached kids that have jumped on Spirit, Skypole, Pacer - have jumped on them as well - And there is a carbon pole that the top rank guys are currently using - Use what works for you- vault safe and hopefully high