The document summarizes the history of hydrogen rotary vehicles developed by Mazda, beginning with the HR-X prototype unveiled in 1991 that had a proposed 125 mile range. In 1993, Mazda modified a 3rd generation RX-7 engine for hydrogen and installed a large multi-tubed hydrogen tank in the trunk of a modified Miata. In 2006, Mazda introduced a dual fuel RX-8 that could travel 60 miles on hydrogen alone. Mazda's 2009 Premacy hydrogen prototype was a modified RX-8 with front-wheel drive that could seat 5 and had ample luggage space, traveling 120 miles on hydrogen alone. The document explains that rotary engines are well-suited for hydrogen due to their

1. Hydrogen Rotary Vehicles
A RESEARCH PAPER BY JAKE WIDMAN

2. History of the Wankel RotaryEngine
Patented in 1929 by Felix Wankel
First use as motorcycles by NSU
Mazda improved the design in late ‘50s
First Rotary engine car in 1967: Cosmos sport
The rotary engine was mass produced in various different cars
from 1967 until 2012

3. MazdaHR-X Prototype1991
First rotary hydrogen prototype
Revealed at Tokyo auto show in 1991
Proposed 125 mile range

4. HydrogenRotaryMiata1993
Modified 3rd gen Rx-7 engine
Large multi-tubed hydrogen tank in trunk
Almost zero emissions
Only a few were leased to private companies

5. MazdaRx-8Hydrogen RE2006
Duel fuel system
210 hp on gasoline, 118 hp on
hydrogen
60 miles on hydrogen alone

6. MazdaPremacyHydrogenRE 2009
Modified Rx-8 hydrogen RE
FWD, series hybrid
Dual fuel hydrogen/gasoline
Seats 5, lots of luggage space
Being leased to Japanese government officials and
private companies
120 miles on hydrogen alone
Near zero emissions

7. Why RotaryEnginesare Suitablefor Hydrogen
Intake, exhaust, and combustion occur in different chambers
Easily adaptable for direct injection
Small and light weight

8. The End