There is a debate in the CT forum over which is faster on the deck and by how much. So, tonight I tested both. 50% gas for both. BTW, 25% either way, more or less, makes no difference in speed. 50 feet above sea level. Carefully measured using E6B. Calibrated throttle prior to runs. 2 runs of each repeated results.
Spit IX: 319 mph with WEP, 310 mph without WEP.
Spit V: 316 mph with WEP, 289 mph without WEP.
My regards,
Widewing