Originally Posted by MatFromPoland
And you are looking for 20 ft hull so RIB size be around 7m (with tubes) plus twin engines.
I just read his current boat was that length. But I agree, a 7m boat & tow weight unsder 1T is not going to happen..... Unless you use Twin 8HP engines...but I don't think that's what he needs!!
I guess the question has to be why 1000Kg? - Is it your tow vehicle? I think we are on the same set of rules for towing over here- and 1000Kg is not one that seems driving licence related to me. (no trailer test =750kg, test = >1000Kg!)
It's also just occured to me - when you say "tow weight 1000Kg", do you mean the whole thing (i.e boat + trailer), or just the boat (i.e no trailer - possibly because you are wanting to use your curent boat's trailer because the person that bought it from you didn't need a trailer and you now have a trailer rated to carry a 1000kg boat?)
Let's put some numbers on paper
As you know, I (personally) reckon a Searider would be a good one to start looking at-
Boat SR5.4 SR6.3
Hull weight 320 680
Engines 2x40Hp 2X70 Hp (from web)
Engines (not done a full market survey, but picked Yam as they seem popular)
Merc Clamshell 1969-1991 (Power trim version, premix) 84Kg
New Yammy 4- stroke "Midrange" F70- 115KG F40-101Kg (I assume you'd want Power trim!)
Boat SR5.4 / Old Merc SR5.4 New Yam SR6.3 / New yam
Hull weight 320 320 680
Engines weight 2x84 2X101 2x115
TOTAL WEIGHT 488 522 910
So, you could buy a 5.4 Searider, hang two shiny new Yam 40 PT engines o nthe back, and still have 480Kg to play with for trailer. fuel etc. If you got the 6.3m you are stuffed if the 1000Kg is the whole tow, but if you are looking at 1000Kg rib for your current trailer.......
Problem you have might be if you mean "1000Kg including trailer"..... A quick spin through indespension's website, and a and a look at the roller trailers one suitable for a 5.4 clocks in at 1300 Kg. One for the 6.3 is 1600Kg.
So let's assume you mean "including trailer" and go down a size of rib
an SR4.7 with max 60 Hp by my reckoning clocks in at 250Kg + 2x 101Kg (looks like same lump as the 40) = 452Kg - not a spectacular saving in weight over the 5.4, BUT if you go for twin 'rude 30s the engine weight for a power trim electric start 9E30DPGL is only 82 KG so your all up weght drops to 414Kg.... then if you can live with manual rope start and no PT the weight drops to 63Kg / engine.....
(if you look at the 'Rude 40 for the SR5.4 it's lardy compared to the yam - I guess the 'rude 30 is the top HP of that group).....
Anyhow, another lunch time's worth of thoughts & another huge post.
If you could clarify the towing weight the impssible might not be so impossible to achieve!