booger man
Seaman Apprentice
- Joined
- Apr 29, 2004
- Messages
- 31
Ok Here is the problem : I have a old Lonestar 14.5ft aluminum riveted semi v fishing rig with a short transom and a 9.9 short shaft for hp limited lakes...I picked up a 25hp merc long shaft for a great price so i can get out of the way of the ski boats at the large lakes....So i could run both the long and short shaft outboards I made a jack plate from 2 1/2 x2 1/2 inch x 3/8 aluminum angle.This set-up works great with the long shaft 25hp(she will fly!!!} but it also caused me to raise the short shaft 2.5 inches higher so it will mount to the jackplate thus causing the anti-ventilation plate to be 1.5 inches above the semi v keel ...I'm right at the verge of ventilating at wot and she porpoises a little with just me in the boat,and ventilation is bad with sharp turns .....Will a doel fin help with the cavitation if not what will ....I do not want to take the bracket off every time i want to switch motors {right now i just remove a few bolts ,switch sides with the removeble bracket pcs and bolt them back to the angle pcs that are mounted to the transom} the Tru-transom holes are sealed{when the two angle pcs are boltled together they look like a c looking down at the transom with a 2 3/4 inch setback......also the clamp on the short shaft doesn't have a wide enough bite to mount on the transom and the bracket also{tried that already.I thought the setback would compensate for the higher ventilation plate.....Any ideas would be greatly appreciated......... I'm getting just over 20mph per a gps with the 9.9 johnson {10 pitch less than a year old}and just over 30 with the 25hp merc and old worn out prop 13pitch {still playing with the motor angle}befor the jack plate i was lucky to get 18mph with the 9.9 and 19mph with the 25 with just me and fishing gear....also the boat has some weight to her {full floor ,carpet,seats,2 batteries toward the bow,live well,fuel, etc} Give Me Some Advice Please...
