Diversion900

Can anyone help with a prop size for a Honda GX25 4 stroke engine, I would love to put it in a boat and have no idea on sizes to start experimenting with.

Any thoughts appreciated, tried or theoretical.....

Macleod

More details would be helpful. Like the type of hull, length, width etc......
Is the prop surface or sub surface ?????


Here are a few ideas : DEEPVEE INBOARD SUBMERGED PROP 25 cc X460/3 X465, X665, 1465, 1662
DEEPVEE INBOARD SURFACE PROP 25 cc X470, X472, X670, 1567

You will have to ask the Cat, hydro and tunnel guys for their advice on what to use !!!!!


The engine you are using weights in at 2.8kg giving 0.8Kw (1.1 hp). 4 strokes are heavier then 2 strokes !!!!!![8D]

rcollector

I have a 50 inch deep v boat that I installed a ryobi 26cc four stroke in a few years ago. I don't know the brand of the hull but it is layed up pretty heavy. It has a sub surface prop set up. I experimented with prather props and found the 270 to be the best for my boat. The four stroke ryobi is not too fast but it sure sounds nice. Hope this helps.

TERBObob

My Feedback: (21)

generally speaking ... a 4 stroker has more torque than a 2 does ... with that , you will need a bigger prop , than with a 2 stroker of the same specs .
I would suggest one with 75 or 80 mm dia . pitch ? not sure , since do not know what kinf of boat , or weight , its going in .

Diversion900

The hull I will be using is a lightweight deep V 800 x 300 x 230