This page provides a detailed comparison of the specifications for the Avery 15-25 and the Hart-Parr Old Reliable 30-60.
| Avery 15-25 | Hart-Parr Old Reliable 30-60 | |
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| Engine | ||
| Engine Manufacturer | Avery | Hart-Parr |
| Engine Cooling Type | liquid-cooled | Liquid-cooled |
| Engine Fuel Type | gasoline | Kerosene |
| Engine Induction Type | - | Natural |
| Engine Cylinders | 4 | 2 |
| Engine Displacement Value | 276 ci (4.5 L) | 2356 ci (38.6 L) |
| Engine Rated Rpm | 1125 | 300 |
| Transmission | ||
| Transmission Type | gear | Gear |
| Transmission Forward Gears | 3 | 1 |
| Transmission Reverse Gears | 1 | 1 |
| Dimensions | ||
| Length Value | 108 | 200 |
| Width Value | 48 | 106 |
| Operating Weight Value | 5000 lb (2268 kg) | 20100 lb (9117 kg) |
| Miscellaneous | ||
| Chassis | - | 4x2 |
| Drive Type | - | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
