Re: What size kicker for a V Hull Sea pro 180CC?
I have a 21 foot Aluminum Runabout, weight 2800 dry.
I use it in the Pacific Ocean, San Francisco bay, the Delta and inland lakes and rivers.
First if you use it in the ocean ever get a Long Shaft or Extra Long Shaft.
On my Boat I have a 15 HP Johnson Long shaft and it works good on most days.
It is mounted on two lift brackets for motor to 20 hp. I made a mounting bracket that ties the two brackets together and made a arm to connect the two releases to lower or raise the motor. The Brackets have a lift range of 15 1/2 inches.
My Boat with a 140 HP I/O, is much lighter in the front so in the wind the bow will turn down wind. The front is also higher and has a soft top which also helps to turn the bow down wind.
I also use an Easy Steer. Motor works very well 90 percent of the time. Top speed is just over 5 MPH on inland lakes.
Out offshore I have two problems. We use it a Lot for slowing our drift when the wind get up in the 30 plus knot range (almost every day durning the Summer). So the motor is in reverse backing into the wind. The swells can be up to 8 feet an as close together as 8 seconds. Problem is the when the swell goes under the stern the Prop will come out of the water. My motor is on the port side and when the prop comes out of the water it will throw water up into the air and the wind will blow it all over my stern starboard fisherman. Also if the motor is set much over idle when the prop comes out of the water the motor will rev up and when it drops back in the water it can break the flywheel key and of course die and not restart until your pull the flywheel and replace the key. So we just run it at idle and use a 4 blade high thust prop 10 by 7 by 4. With this prop we can slow the drift and run at low RPMS so fisherman stays dry the motor will not rev up and will not break the flywheel key.
The second problem is in the big 8 foot swells 8 seconds apart going into the swells and into the wind. If you are quartering and need to turn up into the swell and into the wind then the motor barely has enough power to make the turn between swells. Of course my bow is light and the wind wants to push it down wind and the swell want to push it down swell. It will do it but it right on the edge. Never had to use it in these conditions but have tested several time just for practice and training.
One thing on the Prop comming out of the water. The closer it is to the Transom the less likely it is to come out of the water. Mine on the mount is about 6 inches to 8 inches behind the transom. The prop will come out between swells on real bad day when the swell passes also the motor goes completely under the water when the peek of the swell hits the transom. Motor keep running with no problem.
I have two friends I fish with who mounted the motor on the swim platform and is 18 inches behind the transom. On rough days the motor is almost useless.
Your 9.9 should be fine for your boat but convert it to the long shaft like I did mine. Better yet see if they have a extra long shaft conversion. On thing to know at least on my Johnson 15 is the 9.9 is the same power head, same displacement. The difference in HP is in the carburator and the exhaust tuning and flow. For the most part at low RPMS the 15 has no more power than the 9.9. The real increase in power is at the max RPMS.
For trolling in inland lakes and rivers I can troll from less than 1 MPH to 5 MPH.
As a kicker I really recommend a 4 blade high thrust prop with exhause relief in reverse. On my boat it is the diference form not being able to back up into wind over 5 mph to still being able to back up in 30 mph.
Hope this helps.
I want to add a kicker for trolling and for emergency if needed and I had some question that I found most of the answer for it her on so many great posts but I could not figure out what size outboard is good for this boat?now I will install a jack plate on the star port side,and use the EZ steer link for steering and maybe add a second remote.remember this is a V hull and the bay can get a Little rough 
