nparadisiotis
06-10-2007, 06:03 AM
Have a 16.8ft by 6.9ft 1992 ChrisCraft boat (Caper156 model). The boat is a deep V type with an Evinrude ETEC 150HO engine (1.86:1). I installed a hydraulic jack plate from bob machine that has a setback of 8". Boat weight with 2 persons and gear is 2013lbs. Evinrude states that engine rpm at WOT should be (4850-5850rpm) and engine output is 150HP. tested with 3 props and got the following:
Evinrude Raker 14.5"D x 24" 47mph (GPS) @ 5500rpm
Evinrude Raker 14.5" x 24" 53mph (GPS) @ 6300rpm
Evinrude Viper 14.75" x 21 37mph (GPS) @ 5500rpm
The engine was trimmed corectly and also the best engine height was setup during the tests. The throtle only went half way down when I reached 6300rpm, and so had to stop increasing then throtle. It seems as if there is a huge amount of slip on the prop (around 30%). I am thinking of ordering a RakerII (14.5"x28") prob so to increase my speed and make more use of my throtle. would like to get to WOT. Does anyone know of a way to calculate max. speed that can be reached for a 150HP engine?
Evinrude Raker 14.5"D x 24" 47mph (GPS) @ 5500rpm
Evinrude Raker 14.5" x 24" 53mph (GPS) @ 6300rpm
Evinrude Viper 14.75" x 21 37mph (GPS) @ 5500rpm
The engine was trimmed corectly and also the best engine height was setup during the tests. The throtle only went half way down when I reached 6300rpm, and so had to stop increasing then throtle. It seems as if there is a huge amount of slip on the prop (around 30%). I am thinking of ordering a RakerII (14.5"x28") prob so to increase my speed and make more use of my throtle. would like to get to WOT. Does anyone know of a way to calculate max. speed that can be reached for a 150HP engine?