it depends on your hull, your lower trim plate should ideally be in line with the line of the keel of your boat.
What mph compare to a 3.3 horse power outboard motor
it has a shaft that go in the motor that moves the boat =-Þ
8-15
For a comprehensive answer to this go to marinedoctor.com Ther is a section dealing with this specif question on a 70 hp johnson.
If you will go to Crowley Marine you can look up just about any old outboard motor. There is a diagram there for the 1971 25 hp Evinrude and if you will look there is a plate on the right side looking at the motor from the propeller end just below where the gearcase extension bolts on. It has several small holes in it and this is the water intake. On the Crowley gearcase drawing it is part #19.
An outboard motor made specifically for sailing has 3 major differences. First, the lower section is built to a much stronger standard, and typically can be seen because it will be much wider as compared to a powerboat outboard. The reason for this is that a sailboat outboard is built to not "kick up" so it must be able to withstand minor strikes without damage. The second reason, it has no "kick up" - this is because a sailboat motor has to be able to power fully in both forward and reverse, and powering in reverse with a powerboat outboard will result in the motor lifiting the propeller up and out of the water becuase it is allowed to kick-up. Third, the sailboat outboard will allow the motor to go up in speed just as much in reverse as in forward, while in reverse on some powerboat outboards are limited, to prevent kick-up. So, the lack of kick-up is the key difference in features, with the other changes necessary because of that.
Here is a website you can go to find out.. www.oldmercs.com
The boat does still go full throtle
I have a 14/36 flat boat with a 15 and it goes 26mph with only me and minimal gear.
You will notice on the throttle handle that there are three positions on the legend. "Really Slow", "Start" and "Slow".
A 3.5hp outboard will give you 8mph tops, which would be a normal walk to a slow jog.
It depends on the size craft it is pushing. A 5hp outboard should run fast enough to plane out say a 10 to 12ft. aluminum boat with one man aboard.