As has been said, the boat-like underbody of the craft had been mounted on a wheeled frame before it was assembled.
"The Boy Aviators' Flight for a Fortune"
Wilbur Lawton
He turned his eyes from the wreck to the Sovereign, just as her bow went up on a wave, showing the red underbody.
"Dan Merrithew"
Lawrence Perry
Nearer the tug advanced, so near that the tugmen could see the streaks through the red underbody.
"Dan Merrithew"
Lawrence Perry