at a rate of knots vs helter-skelter

at a rate of knots

prep

  • Quickly; rapidly; fast. 

helter-skelter

noun

  • A helical fairground slide. 

  • Confusion or turmoil. 

adj

  • Carelessly hurried and confused. 

adv

  • In confused, disorderly haste. 

How often have the words at a rate of knots and helter-skelter occurred in a corpus of books? (source: Google Ngram Viewer )