Make the Tempura
In a large saucepan, heat 1 inch of oil to 365°. Set a rack over a baking sheet. In a medium bowl, whisk the rice flour with the baking powder, baking soda and a pinch of salt. Gently whisk in 1 cup of the club soda just until a smooth batter forms; add more club soda if the batter is too thick. Working close to the stove, dip 6 of the shrimp in the batter and add them to the hot oil. Fry until golden brown and just cooked through, 2 to 3 minutes. Using a slotted spoon, transfer the shrimp to the rack to drain. Repeat with the remaining shrimp.