The Big Bertha gives you a slow

8mm Damper Ball Connector Nuts x8

The oversized bearings used are gigantic 20x32x7mm bearings

Projected Max Altitude: 800 ft

The militaries of the US and other countries have used the civilian 707 aircraft in a variety of roles

Power Hobby - Defender 1.9 4.19 Crawler Tires with Dual Stage Soft and Medium Foams ASC40107 The Big Bertha gives youIncludes: Two Tires Two Closed Cell Foams Two Soft (Blue) Outer Foams Two Medium (Black) Outer FoamsFeatures: Soft Sticky compound for maximum traction and grip Dual stage for incredible grip and sidewall support Extremely Durable Closed Cell Waterproof Foam Soft and Medium Outer foam for Maximum Traction Improved Performance and Appearance Specifications: Height: 4. 19" Width: 1. 40"