What Pat said. More feather = shorter distance. More helical = shorter distance.
Arrow weight makes a big difference--heavier will go further.
Helical is also noisier, although I don't know that it makes a difference with flu-flu's. They are noisy anyway.
Other than aerial shots at birds, they are useless for hunting for me. Rabbits and squirrels just duck or dodge them. Remember, they are conditioned to avoid hawks and owls swooping down on them--much quieter, and probably as fast as a slow flu-flu. Your results may vary.