Self-rescue method when CAT boat capsizes

My son is a new player, he hasn’t been using ship models for 3 months.

he  used Chevron boards to build a CAT boat before. I flipped over several times while playing in the water. I either went into the water to fish it out or waited for the wind to blow it back.

The forum looked for ways to save the boat, either by boarding a rescue boat or by capsizing the monohull. There seemed to be no method suitable for catamarans, so I researched the following method.

The picture above is the first plan. The test found that the balloon was unstable and could not be flipped up.

The second plan was improved. A small compartment was made on the cover of the boat. The balloon was placed inside and the cover of the compartment could be pushed open.

There is an air pump inside, and a channel of the remote control is used to control the start and stop of the pump motor. After turning over, I returned to the shore to feel discouraged.