One of my neighbors is into RC big time.
He has two tiny turbine engines of about 50 pounds thrust each.
They turn something like 100 THOUSHAND RPM (with all the harmonics).
These are the absolute coolest toys ever.
Microprocessor controlled starter, even.

I would LOVE to hang those screamers on my parasol for a high speed
pass down the runway...

I saw a video once of someone who mounted two of them to a platform on
the back of a bicycle.