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Old 25 February 2012, 17:57   #11
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Country: UK - Scotland
Town: Glasgow
Make: Ribcraft 6.8
Length: 6m +
Engine: Suzuki df200
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5.5m your looking at about a 100hp typically is the max. there is also a weight limit you need to consider.

PLEASE do not use that boat with that engine again for your own safety.

do you have any pics of the transom from the inside? or who makes the boat?

cheers
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Old 25 February 2012, 18:14   #12
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Country: South Africa
Town: cape town
Length: 5m +
Engine: mercury 225hp
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lol i wont use the boat again!!! ill post some pics up of transom it looks pretty strong and thick fiber glass to me, i think it is a gemini not 100%, i am having endless problems with this boat it is brand new, first my motors shaft was to short, then i bought this merc which to find out had over heated so i opted to re do motor, only to find out no parts available in south africa. luckily my sister lives in miami so she fed ex all parts needed. eventually got motor running after 2 months then this morning when i wanted to test, cars drive shaft broke not of towing but jst of wear and tear. got tht sorted and then boat was driving 90 degree up in the air lol. and now its to powerful..........
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Old 26 February 2012, 03:11   #13
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Country: UK - England
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Boat name: Jianna
Make: Osprey
Length: 6m +
Engine: 200 E-TEC
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So, new car, 7.5 metre hull and you're sorted - no problem
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Old 26 February 2012, 03:31   #14
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Country: UK - England
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Engine is too big and transom may not be man enough to support it but rigged correctly and at the right height is should still work shouldn't it?

We were discussing overpowered tenders on ybw a while back where people are sticking massive engines on tiny tenders, even going for a twin set up on a 2.4m sib, I never tried it but it looked fun.

Massively overpowered dinghies, again - Yachting and Boating World Forums
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Old 26 February 2012, 04:59   #15
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Country: South Africa
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thks but those mostly under 3m tenders ill sot some pics up of transom ect
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Old 26 February 2012, 05:18   #16
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Old 26 February 2012, 15:20   #17
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Country: Australia
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Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
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I have a 5.6m with a 200hp. It planes almost instantly even with a 25 pitch prop.

My boat was built as a commercial dive boat to carry heavy loads and that is why it was plated for such a large engine.

With the Suzuki I have, 150, 200 and 225hp all weigh about the same and you only use as much throttle or hp as you want. The way I see it having a 200 instead of a 150 is not any more dangerous if I don't use the extra power. Having said that I have major chine walk issues that I have yet to sort out.

With your boat, I would be checking engine height. With the motor trimmed so the prop shaft is on the same plane as the bottom of the boat, the cavitation plate should be somewhere close to the bottom of the transom or a touch above. Maybe post a photo if you are not sure.

Also make sure the motor is delivering full power. After a recent rebuild, it is certainly on the cards that seething may have been missed.

Try another prop, maybe the prop bush is letting go under load. A 21 prop should give you fantastic acceleration but not I'd the rubber bush starts sloping at the crucial moment.
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Old 26 February 2012, 15:26   #18
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thks so ill post a pic in the morn the motor revs up like a bomb, and it takes off very well too but like i say the nose doesn't wanna come down causing it not move
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Old 26 February 2012, 15:28   #19
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can u post a pic of your rig pls. kubcat
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Old 26 February 2012, 15:36   #20
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Pick up the engine two holes and see if you are different on the right track. Another solution is the flapper
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