McDonnel made ramjets that were installed at the tips of the main rotor blades. They reached 182 m/sec. peripheral speed. Maybe the PC-42s.

“The Little John”

-McDonnell, at their Missile Propulsion Division also developed pulse jets, the McDonnell-Schmidts, (therefore of German roots).

From Appendix A4/6: The ramjet mentioned in the main text for the little Little John helicopter was the Model 8R14 of this same brand.

-The trials continued with the Big Henry, also with ramjets.

"The Big Henry with ramjets 8RJ4"

From Appendix 6: After World War II, the United States made pulse-jet powered vehicles based on V-1 principles.

-So, the Globe Firefly used an 8 inch McDonnell pulse jet, between 1946 and 1947.

“The Globe Firefly, with twin tail”

-Another application of McDonnell pulse jets, but 14” was in the Boeing KDH Katydid.

“The pretty Katydid”

From Appendix 12: McDonnell made two types of target aircraft pulse jets such as the Skeet and the Katydid.

-They were J-9 and J-11 of 8" and 14".

“Katydid with J-11 on mother aircraft”