Not saying the raker is not a good prop. (If what I said got misinterpreted, just that there have been updates made to others in the last... 40 years now?) The enertia is excellent, just didn't run well on my hull. I even stepped up to a 21p to try and pull it down a bit to behave like others I ran... just wouldn't hold a plane below ~25 mph where others would run down to 19-20. Every once and a while you get a hull that bucks the trend. I've been trying to get my hands on enertia eco for testing as I think that'll match better with my hull.
That said I've tested my enertia (I have since sold it as there is no reason to have 5 different props sitting in the garage) on a few other hulls and that prop was straight magic on those boats. And by that I mean it corrected every single flaw in how it planed, handled and rode.
And the sparrow in concept is cool... but it kind of is just the same thing as a dual prop setup. The performance data they provide indicates that... albeit it was tested against an unoptimized setup. For the price you can buy a crap ton of fuel before it ever becomes worth it....
