Monday, April 18, 2011

Specs from boat ride

With the 16 X 11 prop 2000 rpms made 4 mph 15 deg of bow rise
3000 rpms 8mph and 18 Deg of bow rise
WOT 18 mph and 20+ deg of bow rise turning 5500 RPMS only about 80% on plane,
With the 15X15 2000 RPM 8.7 MPH and 4Deg of bow rise
2500 RPMS 9.7 mph and 7 Deg of bow rise
3500 RPMs 10.1 MPH 10 deg of bow rise throttle is almost 3/4
WOT 5000 RPMs  30 MPH trim up clean 32 MPH, 6 Deg of bow rise
With the 15X17 prop 2000 RPMS 8.3 MPH 5 deg of bow rise
2500 RPMS only 8.9 mph and bow hardly moved above the 5 deg
3000 RPMS 10.5 MPH and bow was up around 12deg
3500 RPMS 11.8 MPH bow was still about 12 deg
WOT gave only 4600 RPMS 30.4 MPH bow down about 6deg  With trim to clean the ride she pushed over 34.9 MPH
Bottom line the 15X15 prop gave the best all around preformance and seems to let the engine run in the comfort zone,  the day of testing 24feet at the water line, 7 foot beam 1/4 rearward from the bow 30Deg dead rise, stern is only about 13 deg of dead rise, the Chine is 4 inches wide and hard flat, the center of the bottom is very round about 31inch radius, total boat is around 348 inches the CG using a strap puts it about 64% of the boat ahead of the CG and about 36% behind the CG we raised the engine again and the Cavitation plate is now about 5 1/2 to 6 inches above the center of the bottom of the boat, Weight 7340 with full fuel water 2 people and about 200 lbs of tools,