I wanted to ask how much of a benefit boat tails have on the performance of rockets. As I understand it the boat tail makes the rocket to be more of a streamlined body and thus reduces the form drag. I remember reading that you can make a rocket with better aerodynamic properties (and thus better performance) if you increase the diameter and use a boat tail versus a minimum diameter rocket. Is this true? (This probably depends on other things like weight, construction, etc., but I am asking if we assume these factors are similar for both rockets.) I would assume for most rockets that the hassle of making a boat tail is not worth the benefits, otherwise there would be more rockets with them. Also, with respect to the end of the rocket, what are the effects of thrust? Does the pressures and turbulence created by the engine's thrust create drag also? If so is there ways to reduce this drag. Thanks for the help!