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Old 10 October 2017, 19:27   #1
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Country: Australia
Town: Bunno
Boat name: Rib
Make: Gemini
Length: 4m +
Engine: Outboard
Join Date: Oct 2017
Posts: 2
Transducer mounting on a Gemini grx 4.2m semi rigid inflatable

Hello crew first post here, just chasing some advice from you gurus out there. Currently I have a 4.2m rib and finding the perfect transducer location painful. Iím running a furuno 588 and a p66 transducer. At the moment I have it mounted off the transom and it reads ok but the image will break up if there is to much chop. I suspect the issue is the floor catipillars and causes air bubbles would it be worth looking at making the semi rigid floor rigid?? I understand the idea behind the boat design is to be able to be folded up but I have it on a trailer.

Cheers guys looking forward to your feed back
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Old 11 October 2017, 04:14   #2
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Country: UK - England
Length: no boat
Join Date: Apr 2017
Posts: 32
sorry for going off topic but how do you find the boat generally? Beach / launch recover?


Was looking at getting one now veering back to a normal rhib - not many on here have the GRX420 as far as I know and the UK distributor has just gone bust unfortunately
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Old 11 October 2017, 04:32   #3
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Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,958
i take it you are traveling at slow speed to use your sounder
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Old 12 October 2017, 21:24   #4
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Country: Australia
Town: Bunno
Boat name: Rib
Make: Gemini
Length: 4m +
Engine: Outboard
Join Date: Oct 2017
Posts: 2
Yeah painfully slow find that the stupid flexing of the hull makes a mess off the readings on the plane. Pretty sure Iím going to just join and bolt every panel together so itís all one hull. Will also better support the transom as well once Iím done.
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Old 10 December 2017, 01:46   #5
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Country: Australia
Town: Pelican point
Boat name: Various
Make: Gemini
Length: 4m +
Engine: Yamaha 25hp fourstro
Join Date: Oct 2017
Posts: 4
Mine is so easy to beach launch. Was up at Ningaloo reef Australia and transported the boat folded up with a yamaha 25hp four stroke.

Assembled on the beach and put the motor on.

A word of warning though. Dont leave the boat on the ocean beach edge as the wave action will fill the membrane between the main and speed tubes with sand. Either anchor 5 to 10m off shore or pull the boat up.
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Old 17 December 2017, 00:37   #6
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Country: Other
Town: Iksal village
Boat name: C-Scanner
Make: rib520
Length: 5m +
Engine: suzuki70 df
Join Date: Dec 2016
Posts: 202
I dont know your boat model,i understood it is a sib not a rib. I had one 3.8 meters with same transducer mounting problem when mounted directly to lower transom..at end i added adjustable bracket to be able to lower the transducer into the water afew inches more and it solved the problem even at high speed
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