Anyone know who designed the P37?

[Moose]

Because I really want to KILL him/her!!!!!!!!!!
We have been fitting a spinny round wind annemometer thinghy to the Radar arch, this has taken 2 days (and I'm not finished yet, we just popped home for clean clothes and more food/forums/images/icons/laugh.gif)
You would have thought that running a cable down from the Radar arch to the Flybridge instruments would have been easy enough, wouldn't you?
OH NO!!!
a) I have had to take off the Perspex panels at the back of the flybridge.
b) I have had to take out most of the seats on the flybridge.
c) I have had to cut a large hole in the Side of the flybridge to install an inspection hatch to give me access to the cables, I managed to cut the circular hole right over a solid lump of GRP holding the Radar arch on, this means my nice circle is a sort of Circular Square with a Round inspection hatch, suggestions?
d) I have had to take the Radar off to get at the conduit that runs through the radar arch, I can't get the radar back on again cos' the threads in the arch have corroded away! Suggstions?
e) We had to put the Spinny round thing over the conduit and then drill a hole through the top of the conduit to put the cable through, Oh dear,,, We missed the conduit by an inch which resulted in us having to dig away large amounts of foamy stuff to get at the conduit which we now had to drill into sideways to put the cable in; guess what, I drilled through the Nav light and anchor light cable which are now shorting out, Grrrrrrr!!!!
f) I am now totally fed up with the whole thing and am not looking foreward to going back to finish it all off tomorrow, if indeed I do manage to finish it tomorrow!!
So if you are around Chichester area tomorrow, pop in and give us some moral support ("Toscana", P37 next to the lock/ fuel pontoon)

From MoBo Moose with the wind gauge

P.S Why do they fill radar arch's with "crusty foam stuff"?



<hr width=100% size=1>

El Alce

 

[tcm]

The crusty foam stuff deadens the racket and stiffens an otherwise quite twangy radar arch, i think. Could the whirly thing have not been put on a separate pole?

<hr width=100% size=1>

 

[Moose]

Seperate Pole? What do you mean exactly?
Its allready 80cm high and looks thoroughly out of place on my MoBo!!!!

<hr width=100% size=1>

El Alce

 

[longjohnsilver]

So why are you putting the whirly round thing on there in the first place? You don't see many on mobos, is it a moose thing?

<hr width=100% size=1>

 

[tcm]

some things can be mounted on a separate pole, fixed at the side of the uper helm for example, some times a radio antenna, then can feed direct into the side of lower helm wiithout digging away in the radar arch ?

<hr width=100% size=1>

 

[Moose]

No, this is a clever one, it gives you True Wind Speed/direction and all sorts of other really useful bits of information. It also links up to the Autopilot so that it accounts for the drift caused by the wind thus saving me a few measly penny's on my fuel bill cos' I will be going in straight lines...like a ferry.

<hr width=100% size=1>

El Alce

 

[Moose]

Erm, good thinking but then I would get all the turbulence from the side of the boat it would also have a seriously large "dead zone"

<hr width=100% size=1>

El Alce

 

[longjohnsilver]

It has already saved you a fortune on fuel bills, seems to have kept you firmly tied to your pontoon for ages and probably for some time to come.

Maybe we should all get one! /forums/images/icons/wink.gif

<hr width=100% size=1>

 

[Moose]

No, tcm and I have to feel unique in having one, so nobody is allowed to buy one from now on!

It is good at saving fuel, I have been sitting here for 2 days watching everyone filling up with diesel and generally making a complete hash of mooring up to a humble fuel pontoon,,,its not difficult,,why can't people just learn to manouver there boat???? I watched a 20footish speed boat go full on into a yacht at about 5kt's A 6M RIB nearly knocked someone out when it tried to jump over the pontoon, that was a novel shortcut! And I watched a Squadron 59 take about 30mins (Not kidding) to get close enough to throw a line on!!!


<hr width=100% size=1>

El Alce

 

[tcm]

No it wouldn't - the wind turbulense round smallish radar arches is teeny. Anyway, you only wanna know it its 2o or ten knots. Bet there lots of turbulence round the radar arch or have you gottit right on the toppymost top?

<hr width=100% size=1>

 

[tcm]

apilot correcting for wind

Eh? Surely the autpilot already corrects for the wind or any other things like waves that knock you off the course set on that fluxgate compass? I mean, the gps doesn't get sort-of nearish but half a mile downwind and say oops, sorry moose, sily me i failed to get near cos of the leeway, sorry mate. The wind thing is just for interest innit?

<hr width=100% size=1>

 

[Happy1]

Would have thought you would have used the newly launched 'wireless' wind annemometer /forums/images/icons/laugh.gif

<hr width=100% size=1><font color=purple> "You only see what you recognise, and you only recognise what you know" <font color=purple>

 

[jfm]

autopilot limited correcting ability

Axshully moose is correct on this one imho. The normal autopilot/GPS is too perfect. It drives the boat along a straight ground track, automatically correcting for wind and tide and anything else. However, moose's gadget will allow him (after much reading of swedish manuals, and calibration, none of which will be worth it) to use the autopilot to drive the boat on a wind-adjusted heading, not COG. That is the correct way to do it, if yer really fussy.

Frexample, if on a long crossing say 12 hours, and for the first 6 hours the tide is coming sideways from your port side, then the next 6 hours it comes sideways from stbd side, you should NOT follow a straight ground track. Rather, you should point boat towards destination, then follow constant heading. In first six hours, you will have drifted a long way sideways "off course". But in the next six hours this will be perfickly corrected. By allowing the boat to drift with the tide, you travel a longer ground track (a sine wave, and you need to check that you dont hit obstacles) but a shorter track through the water, thereby saving oooh £4.50 fuel. In contrast, if you had used a normal autopilot/GPS you would have followed a straight ground track but a sinewave path thru water, thereby increasing your total milage throught the water, and fuel burn.

The above example does not allow for wind drift error, but that's what Moose's gadget can do

So, Moose now has the correct kit to sail "properly". But I entirely accept the above is entirely pedantic, theoretical, and of no practical application to leisure MoBos. It is relevant for crossing Solent-France in a ragboat though

<hr width=100% size=1>

 

[tcm]

Re: autopilot limited correcting ability

I agree re sine waves over english channel, though mostly a short trip will affected one way by tide, and so you adjust to allow for that vector and set course and then boat crabs along the ground track. But this annemometer adjust for leeway, and turns into the wind? Which of course varies with speed, so must be quite clever. And , erm, quite confusing too, cos not sure if you could ever check the heading cos it would always be a bit off either the daft tide-ignoring gps route and also wouldn't be holding the rya-approved tidishly adjusted route.

<hr width=100% size=1>

 

[Moose]

No, its right up high on the Arch.

<hr width=100% size=1>

El Alce

 

[hlb]

It took me three months to fit my TV arial. Funny cos it did not last that long when finally fitted!! But now covers the hole I made for it. Mind you whilst it worked, it was alot more use than your wind indicator.../forums/images/icons/laugh.gif. By the way. If you fart, is it affected in any way and does this alter the course vector??

<hr width=100% size=1> <font color=blue>No one can force me to come here.<font color=red> I'm a volunteer!!.<font color=blue>

Haydn

 

[jfm]

sine wave navigation

As I said, quite theoretical and not really any practical use for leisure boaters.

Yes, you have to calibrate them, specifically to the boat. You need to calibrate how much wind speed (resolved geometrically to get the abeam compnent) produces how much leeward drift, so the computer can compute the heading adjustment. (I repeat, this is all tosh in practice especially in MoBos)

As you say, the straight ground track with the boat crabbing to stay on it is RYA approved method. I unnerstand that if you plot a sine wave across the channel (even if you make sure you dont hit any rocks etc) you fail the exam. But the RYA are quite wrong on this imho.


<hr width=100% size=1>

 

[Guest]

Re: tosh

it's got nowt to do with fuel consumption and tracks and stuff. He needs the wind direction, cos the moose hunters will always approach from downwind.

Now, if it were Jimi, he'd need one to work out how far downwind his bog's biohazard zone extended...

<hr width=100% size=1>