Yes Anthony, there have been some planes with single-bladed propellers.
Single-bladed propellers William Lawrence Sr Omnibit 4-10-19
Advice in a crowd William Lawrence Sr Cryptowit 4-10-19
Kh wkdw fdq kdyh sdwlhqfh fdq kdyh zkdw kh zloo.
Answer to yesterday’s William Lawrence Sr Cryptowit quote puzzle: Never give advice in a crowd.
Pope Paul VI