Originally Posted by donutsina911
are you sure about that? Not disputing what you say, just that there are shed loads of 7.8's out there with 250's (mine included), a few with twin 200's and a couple with 300's....
There are 2 different rules in wich you can calculate the max engine power off your boat.
1) is the formula stated by Polwart and myself, thats the easy one. That rule apply to all RIB's no question asked. This is the "normal" way to calculate max enigine on any CE marked boat.
2) States that you can put a bigger engine on your RIB if you follow some standards. I don't have them all, but maybe Polwart does.
but here goes....
a) the factory that is building the boat (not the importer or reseller), is to supply the boat as key finished. (this means incl. engine all consoles, a-frames and electronic)
b) the factory have to make a sea trial in whích they have to complete different taskes with the boat within a specific area.
c) You as the owner can not change anything on the boat that will change weight distribution. (add a new bigger battery, add a new seat or even remove the a-frame)
The list is longer, but if you as the owner of the boat change anything you will make the CE marking invalid.
And since boating dynamics in SA, dosn't supply the boat finished with consoles and engine mounted you would be breaking the CE marking by putting a 250 HP engine on the back off your balistic 7.8
max HP = ((7.8 * 2.55 * 10) - 33) * 1.314 = 217,9926 HP
That means that if I have the width right (from memory) you can not even put a 225 one it.
Or maybe the factor from KW to HP is wrong, I really thought the max Hp on balistic 7,8 was 225, but I might be wrong on that.
Polwart - You wouldn't happen to have a copy off the complete ISO standard for RIB's that I could bye / borrow from you ?