Gone are the days when an inflatable boat was just a small tender hanging on the back of a yacht. Inflatable boats can now be 45 feet long, with uses ranging from recreational fishing to Coast Guard rescue
Fabric
Manufacturers make inflatables from Hypalon or PVC fabrics. Hypalon is stronger and resistant to chemicals and ultraviolet light. PVC isn’t as durable but is lighter and less expensive.
Portability and Performance
Inflatable Marine Products says fiberglass rigid bottoms have the best impact and abrasion resistance characteristics but are more difficult to transport. Roll-up units with inflatable floors, which are easiest to stow, lack the strength of rigid-bottom craft
Tube Size
Bigger tubes create higher load capacity as a result of greater buoyancy and have a drier platform with more stability.
Keel
An inflatable with a good keel has the ability to maintain directional stability underway. Flat bottom inflatables are difficult to row or steer under power.
Transoms
Transoms made of reinforced fiberglass or epoxy coated marine plywood are sturdiest. Look for reinforced joints, bonded securely to the floor and tubes.
http://www.ehow.com/facts_6938222_compare-inflatable-boats.html?ref=Track2&utm_source=ask
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