Log under-reading
John Seager
weed etc. I noticed that the little metal 'bullet' in the paddle wheel has
gone rusty and there has presumably been some loss of metal. In my
ignorance, I would have thought that if there's enough metal to give a
reading at all, the revs would determine the speed. Mine seems to be reading
about 1/4 of true speed. I guess I obviously need a new impellor but am
curious as to how it works.
TIA John.
LeeShore
allows me to correct it in the manual. Quite complex. Have a look at
your manual it should be in there somewhere. Of course the duet may not
have the function when it is trying to do several thrings at once. I
used to have an Autohelm duet on a previous boat and as I remember that
wasn't adjustable.
The Floating Bear
Are you sure that there should be only one of them?
Regards,
Jerry
1973 Marcon Sabre 27 bilge keel
Plymouth, UK
NotMyRealName
Floating Bear <je...@cix.theobvious.co.uk> writes
There is normally a magnetic lump and an opposite counterbalance (lead I
think). It may be an imbalance due to a missing weight that is slowing
the paddle wheel.
--
Spike
John Seager
> think). It may be an imbalance due to a missing weight that is slowing the
> paddle wheel.
>
> --
> Spike
This sounds correct - there are two little lumps on the paddle, one of which
has gone rusty, presumably the magnet. My guess is that the magnet has lost
most of its bulk and probably isn't closing the switch every revolution. I
suppose I could get clever and epoxy another little magnet in place (if I
could find one small enough) but I think I'll give my friends at NASA a call
and get a new paddle wheel.
John.
John Seager
> From the manual, the Clipper Duet log can be recalibrated. To
> do this, press the "ILLUM" key whilst the instrument is
> switched on. This enters the configuration mode and will
> display "SET ENG". Press "TRIP". The display changes to
> "CAL" and the current setting (100%) This can be incremented
> up to 150% by pressing "TOTAL" or decremented to 70% by
> pressing "TRIP". If the instrument is over-reading, reduce
> the factor, if it under-reads, increase the factor. Pressing
> "SPEED" returns to the "SET ENG" mode and "ILLUM" exits
> configuration.
>
> That said, if it is reading one quarter of the true speed,
> then there isn't enough range to accommodate this. The rust
> on the paddle wheel slug shouldn't make any difference since
> (AFAIK) it is a simple magnet that closes a reed contact each
> revolution. I'd make sure the paddle wheel is rotating freely
> since any stickyness in the bearings will make it under-read.
> That assumes it once did read correctly...? - and is now the
> right way round, perpendicular to the flow
>
Yes, the log worked well enough in the past - when it wasn't doing its trick
of attracting every form of marine growth know to man. Thanks for the
recalibration info but, as you say, my error is beyond the scope for
adjustment.
John.
The Floating Bear
price).
Steve Brassett
"The Floating Bear" <je...@cix.theobvious.co.uk> wrote in message
news:memo.2006040...@jezza.compulink.co.uk...
>I bet they sell the wheel as a spare part (doubtless at an
>extortionate
> price).
>
Try here:-
http://www.bluewatersupplies.com/nasa.htm
£5.04 - no VAT, no price on p&p, but you could always ask them.
Steve Brassett
John Seager
"Steve Brassett" <steveb...@gmail.com> wrote in message
news:pbCdnbdIO-1...@pipex.net...
p&p, which I think they do at cost. Out of interest, I did a bit of phoning
around locally (I'm in Cape Town) and found a supplier with stock in
Durban - but he wants the equivalent of £11.21 (incl p&p and VAT). This
thing can't weigh much, so air mail from the UK will probably be cheaper,
and ironically, probably faster! The cash involved here is small but it does
confirm my suspicion that we 'yachties' do tend to get ripped off by the
middle man, more often than not. (Yeah, I know, small, infrequently needed
parts cost the retailer huge amounts in admin to keep on their shelves
but....!)
John.
Ronald Raygun
> (Yeah, I know, small, infrequently
> needed parts cost the retailer huge amounts in admin to keep on their
> shelves but....!)
Well no, the admin costs are trivial. The real point is that you
have to *have* the shelves! The more stock you hold, the bigger
premises you need, and the more they will cost to rent.
Nick Temple-Fry
Actually the major cost is the return on money.
A retailor selling a fast moving item will acquire it on 30-60 days
credit terms (more in some markets), and sell it in 1 or 2 days,
funding the replacement out of the sale and taking the profit. In a
given month the retailor may sell say 15 of those items.
Say the retailor buys at £5 and sells at £8 then he will in a month
make a gross of £45 for an actual investment of £5. Out of that he
will then take his overheads (staff, rates, shop), in addition he will
have 15-1*£5 in cash which he does not yet need to pay to the supplier
which he can use either to earn interest or fund the business.
Now if instead of selling in 1-2 days he sells in 45 days, then at the
end of the month he has to pay the supplier, but has earned no cash to
make the payment.
A Chandler will have a mixed stock of slow and very slow moving items,
plus a few fast movers (antifouling, certain cleaning products etc).
I don't envy small chandlers their business, especially when so many
of the high margin products are now bought from low overhead internet
sites.
Graham Frankland
news:t2f7325js67pub5ac...@4ax.com...
> On Wed, 05 Apr 2006 12:22:17 GMT, Ronald Raygun
> <no....@localhost.localdomain> wrote:
>
>>John Seager wrote:
>>
>>> (Yeah, I know, small, infrequently
>>> needed parts cost the retailer huge amounts in admin to keep on their
>>> shelves but....!)
>>
>>Well no, the admin costs are trivial. The real point is that you
>>have to *have* the shelves! The more stock you hold, the bigger
>>premises you need, and the more they will cost to rent.
>
> Actually the major cost is the return on money.
>
rent + rates were by far the biggest expense. OTOH if you are selling say
jewellery or cameras, a greater value of stock can be displayed in a much
smaller area so bank interest on value of stock may be the major worry.
> A retailor selling a fast moving item will acquire it on 30-60 days
> credit terms (more in some markets), and sell it in 1 or 2 days,
> funding the replacement out of the sale and taking the profit. In a
> given month the retailor may sell say 15 of those items.
>
Most trades in my experience now have 28 day settlement terms and if you
want the best prices, 7 days. Suppliers can no longer afford to finance
small business.
>
> Say the retailor buys at £5 and sells at £8 then he will in a month
> make a gross of £45 for an actual investment of £5. Out of that he
> will then take his overheads (staff, rates, shop), in addition he will
> have 15-1*£5 in cash which he does not yet need to pay to the supplier
> which he can use either to earn interest or fund the business.
>
> Now if instead of selling in 1-2 days he sells in 45 days, then at the
> end of the month he has to pay the supplier, but has earned no cash to
> make the payment.
>
> A Chandler will have a mixed stock of slow and very slow moving items,
> plus a few fast movers (antifouling, certain cleaning products etc).
>
> I don't envy small chandlers their business, especially when so many
> of the high margin products are now bought from low overhead internet
> sites.
>
Chandlers mark-ups are pretty low on many items - 10-15% on electronics for
instance if they want to be competitive. 25-35% discount is about the norm
on the rest unless they have a very high turnover. I have various
marine/chandlery/electronics trade accounts but some popular high turnover
items are just as cheap from Compass, particularly when taking into account
minimum order values. We all know nuts & bolts and "caravan" items are a
rip-off but they have to make the margin wherever they can. The rent on the
small chandlery at Conwy marina was in the region of £26k p.a when
Tradewinds went bust.
Graham.