High School Strength and Conditioning Coaches
Kipping pullups are they safe and effective?
I would strongly suggest the person wanting to learn a "kipping pullup" needs to have a deadhang pullup first. There's many reasons for this but the main idea is to get the entire shoulder strong enough so there is no injury. When learning the kipping motion, it can be very jerky and can lead to shoulder injuries.
Kipping your pullups will not increase strength, it will only make pullups more time efficient.
Here is a good article related to this topic. http://crossfitbayarea.com/pull-ups-dead-hang-sexy/