NASA Duet question

Koeketiene · 13 Nov 2003

Hello world,

The NASA Duet combines log&depth. I must admit my electronic know-how is very limitted - I know how to use it, not to fit it.
Question about the depth transducer - surely it is mounted INSIDE the hull, on sort of gell thingy? Someone is trying to tell me that a hole needs to be made in the hull to fit the depth tranducer.
Also a link to a NASA website or the Duet manual would help me a lot.
Some clarification would be very much appreciated.

Thanks

<hr width=100% size=1>Fair winds.
If not... reef early!

charles_reed · 13 Nov 2003

Depth sounder transducers can either be mounted inside the hull within an oilpot or as a through-hull fitting.

The latter is far more effective and powerful.

With regard to your need for manuals, why not contact NASA on 01438 354033

<hr width=100% size=1>

Strathglass · 13 Nov 2003

The depth transducer can either be mounted inside or outside the hull.

If it is mounted outside it either leaves a projection outside the hull or you have to fair it in with a wooden pad or something similar. The depth sensor is not as good a shape as some other makes of sensors.

The alternative is to mount it inside the hull. NASA themselves make a kit to enable this to be done. This is quite satisfactory and saves anothed hole in the hull. The kit comes complete and is not too expensive.

You can get the kit from John at All Gadgets. He posts quite frequenty on the forums. I think you will be able to download the manual from his website. If you can't I can scan it and email it to you.

The only disadvantage of the Duet is that you cannot connect the NASA repeaters to them as you can with individual instruments.

Iain

<hr width=100% size=1>

jimbouy · 13 Nov 2003

Hi

I think what you need to know is that the duet has two transducers.

The depth which can be in hull and the log which is thru hull.

Another user was kind enough to send me a copy of an article on fitting one some time back. PM me with your email and I'll forward it to you if you want.

Jim

<hr width=100% size=1>

Alex_Blackwood · 13 Nov 2003

For website try nasamarine@kbnet.co.uk
They are still in the process of building but at least it will give you e-mail links.

<hr width=100% size=1>

anabel · 13 Nov 2003

As already said, you can have the transducer either inside the hull or make a hole to put it through the hull. Even tho' there is a slight loss in sensitivity, having it inside is the better option. - from the point of view of keeping it clean & safety. You don't have another hole in the hull.
I have two depthsounders & use the "inside hull" method. In one case I used Arldite to bond a piece of Wavin plastic pipe to the hull. Use a thin oil (Castor oil!) to immerse the transducer head in the pipe. Suspend the transducer so that it doesn't touch the hull (couple of ml. clearance) and cannot move about in the pipe.
With the second transducer I just bonded it straight on to the hull. You will need to have make sure there is no air trapped between transducer head & the hull. Also the stem of the transducer needs to be vertical. (not so easy in a deep keeled boat. Mine is flat-bottomed.
Hope this info might be of some use.
Regards.
E.H.

<hr width=100% size=1>

milltech · 13 Nov 2003

You can download the "Duet" manual from my web site as a pdf file. If you copy and paste this link you will find the download just under the price.

http://www.allgadgets.co.uk/ag/product.asp?dept_id=1&pf_id=AG0008

The Depth Transducer installs inside a GRP hull, and through the hull on steel of wood, with a fairing outside to protect it. With a GRP hull you can install the tranducer in an oil bath, which you can make yourself or buy the Nasa kit. You cn also glass the transducer to the hull but this is a kind of no-going-back solution.

The Log of course is always through the hull.

I haven't read all the other posts so I apologise if this is repetition.

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

milltech · 13 Nov 2003

I don't think that site will give you a current email link, if you need it it's nasamarine@aol.com

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

jimbouy · 13 Nov 2003

I like the bit that says..

"with the vessel out of the water, drill a 42mm hole" /forums/images/icons/smile.gif

No doubt with out that they would be sued by some guy who ends up with his boat at the bottom of the harbour.

Jim

<hr width=100% size=1>

Koeketiene · 13 Nov 2003

Thank you for pointing me towards All Gadgets. Exactly what I was looking for.
Found it & got it.

<hr width=100% size=1>Fair winds.
If not... reef early!

milltech · 13 Nov 2003

I think it's fair to say that in this modern and highly litigeous world Nasa are suitably concerned at the ramifications of their mainly D-I-Y marketplace. In each box is a yellow card with suitably dire warnings, "read and fully understand the instructions", "only proceed ... if you are competant to do so", etc. etc.

Everyone wants to sell as much of everything as they can, but I think Nasa are right to point out that safety is not an issue to be taken lightly, especially at sea.

Removing the boat from the water before drilling the hole would seem so obvious that it makes us laugh, but somewhere there is someone....... there's always someone.

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

jimbouy · 13 Nov 2003

I wasn't critisising, it just makes me smile ... as do many of the other warnings and disclaimers we see these days.

Jim

<hr width=100% size=1>

milltech · 13 Nov 2003

Yes I understood that. I agree with you. In fact I'd say that all the obvious things are made still more obvious, and all the difficult things are made still more obscure, like computer error messages for example!

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

AlanPound · 13 Nov 2003

"Removing the boat from the water before drilling the hole would seem so obvious that it makes us laugh, but somewhere there is someone....... there's always someone."

i) There is always someone...
ii) They would use a 240V electric drill...

<hr width=100% size=1>

Stemar · 13 Nov 2003

Re: there\'s always someone

On the radio today: someone bought a superman suit for their nephew. On the packaging in big letters "WARNING - Does not allow the wearer to fly"

<hr width=100% size=1>

milltech · 14 Nov 2003

Re: there\'s always someone

Oh that's good!

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

jimbouy · 14 Nov 2003

John

I have just had my Target 2 log delivered from you. Nice quick service by the way!!!

But no mention in the instructions of the need to be out of the water, when making the hole!!!!!!!

I hope those guys at NASA have a good lawyer /forums/images/icons/smile.gif

Jim

<hr width=100% size=1>

milltech · 14 Nov 2003

Well that's because you're not supposed to actually USE IT. Just screw it to the bulkhead to look good, and amuse yourself pressing the buttons and flicking the impeller with your finger to get really impressive readings.

<hr width=100% size=1>John
<A target="_blank" HREF=http://www.allgadgets.co.uk>http://www.allgadgets.co.uk</A>

jimbouy · 14 Nov 2003

Hours of fun!!!

<hr width=100% size=1>

Cantata · 17 Nov 2003

In this litigious world - I just want to tell you all that my wife bought a new sandwich toaster the other day, and inside it was a notice printed in large red letters "This appliance gets hot when operational".
It does, too.

<hr width=100% size=1>

NASA Duet question

Well-known member

Active member

New member

Active member

Well-known member

New member

Active member

Active member

Active member

Well-known member

Active member

Active member

Active member

Member

Well-known member

Active member

Active member

Active member

Active member

Well-known member

Share this page