Pentecost E-III Hoppicopter - Pima ASM, Tucson, AZ
Posted by: Groundspeak Regular Member kb7ywl
N 32° 08.375 W 110° 51.951
12S E 512651 N 3555915
Quick Description: Pentecost E-III Hoppicopter s/n none r/n none
Location: Arizona, United States
Date Posted: 3/13/2012 4:26:20 PM
Waymark Code: WMDZJ0
Published By: Groundspeak Premium Member Ddraig Ddu
Views: 2

Long Description:
The Hoppicopter is a part of the long quest for a truly low-cost personal flying machine. It was designed by Horace Pentecost of Seattle, WA, during World War II. He marketed it to the US military as a replacement for the parachutes used by paratroops. The design consists of a small 20 horsepower motor powering two counter-rotating sets of rotor blades, strapped to the back of the pilot. The greatest weakness of the design was its use of the pilot's legs as landing gear. If he stumbled during landing or take-off the blades would quickly turn into thousands of potentially lethal splinters as they pounded themselves to bits on the ground. This was, quite correctly, seen as ridiculously hazardous and the idea was quickly abandoned.

The Hoppicopter was designed by Horace Pentecost of Seattle, Washington during World War II as a replacement for paratroopers' parachutes. Twin co-axial rotors were powered by a 20 hp engine.
A few test hops were made; however, relying on the pilots feet for landing gear was inherently dangerous. If the pilot stumbled on landing, the rotating rotors would quickly turn into thousands of lethal splinters.

An improved version was developed with landing gear.

Source: (
Type of Aircraft: (make/model): Pentecost E-III Hoppicopter

Tail Number: (S/N): s/n unknown

Construction:: original aircraft

Location (park, airport, museum, etc.): Located in hangar 1N at Pima Air & Space Museum, Tucson, AZ

inside / outside: inside

Other Information::
Pima Air & Space Museum 6000 E Valencia Rd Tucson, Arizona 85756 Phone 520-574-0462 Open 9:00 AM - 5:00 PM Daily Last admittance at 4:00 PM $15.50-Adults $12.50-Pima Co Residents $12.75-Seniors $ 9.00-Children FREE---Children 6 & under $ 7.00-AMARG $13.50-Group Rate

Access restrictions:

Visit Instructions:
Photo of aircraft (required - will be interesting to see if the aircraft is ever repainted or progress if being restored)
Photo of serial number (required unless there is not one or it is a replica)
Photo(s) of any artwork on the aircraft (optional but interesting)

Tell why you are visiting this waymark along with any other interesting facts or personal experiences about the aircraft not already mentioned.
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NW_history_buff visited Pentecost E-III Hoppicopter - Pima ASM, Tucson, AZ 7/11/2015 NW_history_buff visited it