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StewardTech Turbine

Internal Combustion Engine

Electric Motor

Weakens an Already Aging Power Grid

No

No

Yes

Primary Fuel Source

Any Combustible from Coal Dust to Hydrazine (Including Petrol and Hydrogen)

Petrol

Coal and Natural Gas

(to Generate The Electricity)

Abundant Refueling Sources Worldwide

Yes

Yes

No

Requires More Rare Earth Materials than Available on The Planet

No

No

Yes (Batteries)

Moving Parts Inside Engine

5

Hundreds, Depending on Size

8

Requires Major Electrical Capacity

Upgrade

No

No

Yes

Requires Major Increase In Copper Mining

No

No

Yes

Dramatic Range Reduction in Extreme Weather

No

No

Yes

Cost of Car Engine

$400

$3000 (4 cyl.)

$1200-4000

Scalable from Lawn Mowers to Jets and Heavy Freighters

Yes

No

No

Maximum RPM

Over 30000

~10000

Up to 21000

Cheap to Service

Yes

No

Yes

Cheap to Rebuild

Yes

No

No