  The main result in this paper is a non-existence Theorem of entire
$Q_{n-1}$-translators in $\mathbb{R}^{n+1}$. In addition, an example of
non-entire complete $Q_{n-1}$-translator has been found and a Tangential
Principle for $Q_k$-translators in $\mathbb{R}^{n+1}$.
