Cardboard vs Fiberglass Body Tubes: Which to Use?

Cardboard versus fiberglass body tubes is a choice about the specific tube and complete rocket, not a motor-class cutoff. Paper tubing spans light model-rocket products and heavy-duty airframes; fiberglass products also differ by laminate and construction. The NAR High Power Rocket Safety Code includes both paper and fiberglass among lightweight construction materials, while requiring an appropriately certified flyer and stable design.

Compare the materials without a blanket rating

Neither label guarantees a flight. Airframe loads depend on the motor’s thrust profile, geometry, joints, fins, mount, stability and recovery. For high-power projects, use the NAR high-power code and its certification requirements; for model rockets, follow the model-rocket code and motor and kit instructions.

A paper-tube example worth checking

LOC Precision lists heavy-duty cardboard airframes, and Apogee lists a LOC brown-kraft-paper tube in its high-power tubing catalog. These listings disprove a categorical claim that paper is confined to small motors; they do not approve any particular build. At the smaller end, Estes lists its BT-50 spiral-wound paper tubes as a three-pack with NC-50 components identified as compatible. Check the current listing and dry-fit the actual components rather than assuming all BT-50 products are identical.

Weight, cost and moisture: compare actual products

Obtain the exact tube’s inside diameter (ID), outside diameter (OD), wall, length, listed mass and current price from its supplier. A price-per-length comparison is useful only after accounting for the required cut length, couplers, reinforcements, finishing and shipping. To assess flight performance, weigh the completed alternatives and simulate each configuration with its intended motor and recovery system; material names alone cannot predict an altitude gain.

Unfinished paper needs appropriate protection from moisture; a cured fiberglass laminate may be less moisture-sensitive, but installed parts and joints still matter. Neither choice is permission to launch in rain. The NAR model-rocket code specifies safe weather, and the high-power code sets launch-weather restrictions. When cutting or sanding composites, use dust control and appropriate respiratory protection under the material and tool manufacturers’ instructions.

Decision checklist

• Choose a named tube and verify its listed dimensions against nose cone, coupler and centering-ring specifications.
• Check the full structural design, recovery loads and manufacturer guidance rather than assigning a motor letter to a material.
• Compare finished mass and current delivered cost for equivalent configurations; do not infer reuse durability from the tube alone.

For supplier-specific thin-wall BT dimensions, see the body tube size chart.