RL24, RL28, and RL34 Trailable Yachts
from Rob Legg Yachts

RL Yacht Owner's Discussion Forum

Return to the Forum List

speed / depth instruments
What is the most economically viable (cheapest) form of instrument(s) to fit a RL 24 and where is the best place to mount them. I thought that through the single skin in the motor well would be a good idea but have been told there could be too much turbulance. Others must have fitted these devices, any ideas?
Martyn8-Apr-2004    Edit    Delete 
Location of Instruments
Hi Martyn. I installed my Navico Sum Log in the out board well' even though the best place is just forward of the centre plate I'm told, but I don't fancy drilling holes through the hull, so I put it in the well as far forward as possible. It seems to work very well there, I have tested the accuracy with a GPS, and it seems to be ok. It also is much less likely to get damaged during launching and retrieval and when drying out. The Depth Sounder in above reccomended spot as no drilling of holes is required for the Sonar to operate.

Bill Post9-Apr-2004    Edit    Delete 
I bought a Navman 4150 for INMA, its great.


greg12-Apr-2004    Edit    Delete 
Sorry for the second post, I have been having technical problems posting on this site for a few days.

I bought a Navman 4150 with through hull sensors from Star Marine in the USA for INMA. Their quoted delivery price was lowered to $40 after the order.

I mounted the speed sensor in the wet engine well and used silicon to secure the depth sensor in the forward port locker.

I purchased rectangular plastic conduit from Bunnings and glued it in position to run all wires. It has a removable cover which makes wiring easy.

It works very well with the GPS used to calibrate the speed. The digital voltmeter is also great.


Greg12-Apr-2004    Edit    Delete 
There are good fish finders available for under $300. If you turn off the fish ID they are great depth sounders but why bother? For budget models, try the Garmin 80 or preferably the 120, currently around $270. The head on my sounder is mounted on a swing away bracket. In use, it sits on one side of the cabin entry, clearly visible but protected. It swings away behind the bulkhead when not being used.

The transducer is mounted in the outboard well, ahead of where the motor used to be. I am one who firmly believes in hanging the outboard (5hp Suzuki) off the transom. Our boat is definitely quicker since doing that. There is a little turbulence from the centreboard but you can reduce the sensitivity to stop that. The only drawback is that you have to tack a little sooner when approaching a sand bank (and there are plenty of those in the Great Sandy Strait) or the board can hit bottom while the sounder tells you there is still 4 ft of water. As for speed, we have a hand-held GPS mounted on another swing away bracket on the other side of the entry. A Garmin GPS72, arguably the pick of the crop at the moment, is not much more than $300 and well worth the investment. You can combine both instruments with a sounder/GPS such as a Humminbird Matrix for around $700 or you can go the whole hog and purchase a sounder/chart plotter combined for around $1300 (Matrix 55) but be aware that some other brands are cheap for a reason. All of this now makes a sumlog obsolete, in my opinion. Hang the expense, just do it!



Mike14-Apr-2004    Edit    Delete 
Depth & Log mounting
The Sting has both instruments, which are Navman 100 series mounted on the cabin bulkhead.

The depth transducer is located in an aft corner of the forward/centre V-Berth compartment. The transducer held vertically by being imbedded in a large lump of silicon which is free of any air bubbles. I have also placed it where there is only the hull lay up of glass ie no extra glass due glassing in of bulkheads etc. This location has proven to be sensitive enough and only rarely does the sounder have any problems with air bubbles in the water.

The log paddle wheel is mounted through the hull on the starboard side ahead of the drop keel where there is a double skin. I cut approximately a 100 x 100 hole in the inner furniture skin and glassed it the hull forming one layer, an appropriate sized hole was then cut in the hull with a hole saw. This paddle wheel position has enabled the yacht to be launched and retrieved without catching the trailer it is also well clear of the sand etc when we dry out on a beach. Due to log failures over the years changing the hole size in the hull has not been any problem, the current log unit is about 10mm in diameter smaller than the previous.

Having had a number of logs in 2 RL24's I find the current Navman 100 series excellent. Especially the paddle wheel as it never catches anything, previous brands would pick up weed etc and jam regularly in weedy areas.

Lloyd14-Apr-2004    Edit    Delete 

Return to the Forum List       Add a message to this discussion