electroman
09-03-2002, 10:48 PM
i can see i am at the right place. i am no where in the same class of preformance , as this form is. i hope you can share your understanding of "hydrodynamics" , to help me solve an setup issue.
here are the specs 16' aluminum runabout with 60" beam ,45 mariner with 2:1 gear ratio 5400rpm @ 25mph (gps) package weight 1300# (with driver) current slip .6 prop 11"dia 15" pitch 3 blade 8 13# batteries are located in the ski hole , to provide 9 gallon of gas in the fantail.
the reason for this post . i installed a sting ray hydrofoil . my mininum plane speed went from 17mph to 14 mph (trimed in) i had to trim out for max speed with some slight porposing .the boat did not wake a deep trough, but i had alot of engine spray . the splash line on the hull went to 6' to 1' . i feel the motor is set to deep . the dealer says 20"transom needs the 20" shaft .the hull has a set of strakes on the deep vee (does not look that deep but it is a dry boat on lake erie) the area below the cavitation plate seem elongated. the water pickups start 2" below the cavitation plate , i have enough clerance to mount a 16"dia prop. please take a look at the picture. the strakes are located outside the bunks
i would think that the top of the prop being even with the keel would set the cavitation plate even with the strakes. would be more hydronamic
here are the specs 16' aluminum runabout with 60" beam ,45 mariner with 2:1 gear ratio 5400rpm @ 25mph (gps) package weight 1300# (with driver) current slip .6 prop 11"dia 15" pitch 3 blade 8 13# batteries are located in the ski hole , to provide 9 gallon of gas in the fantail.
the reason for this post . i installed a sting ray hydrofoil . my mininum plane speed went from 17mph to 14 mph (trimed in) i had to trim out for max speed with some slight porposing .the boat did not wake a deep trough, but i had alot of engine spray . the splash line on the hull went to 6' to 1' . i feel the motor is set to deep . the dealer says 20"transom needs the 20" shaft .the hull has a set of strakes on the deep vee (does not look that deep but it is a dry boat on lake erie) the area below the cavitation plate seem elongated. the water pickups start 2" below the cavitation plate , i have enough clerance to mount a 16"dia prop. please take a look at the picture. the strakes are located outside the bunks
i would think that the top of the prop being even with the keel would set the cavitation plate even with the strakes. would be more hydronamic