18ft sbs for sale on ebay??

scottyboy · 15-03-2005, 06:31 PM

Theres a 18 ft sbs for sale on ebay item no 4535498582!
It says similar to ring but ive never heard of it or seen one?
Anyone know anything about them?

Wacky Racer · 15-03-2005, 09:50 PM

The boat is a SBM not a SBS, mainly used for ski racing in the 70's
Built like a brick sh*t house, most were twin rigs, no room in them either, built in the New Romney area I think.

BluFin · 15-03-2005, 10:29 PM

SBM is right - Sports Boat Moulding was the make and heavy
a slightly intresting ebay option could be

http://cgi.ebay.co.uk/ws/eBayISAPI.d...535491364&rd=1
But the price is creeping up who knows whats under the hood could be solid or Ok ??

Tony Davis · 15-03-2005, 10:37 PM

SBM's were built in Wales, and started off as a 21 foot ski racing boat, they then brought out an 18' version!

roofer · 15-03-2005, 10:42 PM

i bought a boat a couple of years ago that had been in someone's garden for 5 years, the boat looked like a garden inside,full of vegetation.the outboard was a mercury 75,we put a battery on and some fresh petrol in, cleaned the plugs up and it started first turn. id bet that if it was running before being stored it would run again with little effort.

Captain Chaos · 15-03-2005, 11:52 PM

where they also known as "Boss" seen something that looks quite similar with a pair of Xr2's and later a 2.5efi.

that appeared to be built like....well my 21

Jon Fuller · 16-03-2005, 12:19 AM

Boss 18 and 21 were designed by Ron Masterman (who also built the plug/mould) and were built by Arthur DeGraff (of trailer fame) and Nick Keyser. Nick is a friend of mine, and is thinking of re-starting production.

Captain Chaos · 16-03-2005, 12:31 AM

well the one down at my caravan is awesome. the guy drives the life out of it. Must av been around 10 years or so that boat. Never had a retrim or out. Looks as good as the day it left the mould.

They've got a very angular but quite neat moulded screen & are relativly wide.................am i right?

add it to the list mate!

Captain Chaos · 16-03-2005, 12:32 AM

In fact...........I just looked at my degraff booklet and seen a couple of boats.

quite nice eh?

Tony Davis · 16-03-2005, 08:58 AM

Sad eh, I found this ad in the July 79 issue of Powerboat & Watersking. (the official mag of the BWSF)

I tried phoning, but the number is unobtainable!

K9 racing · 16-03-2005, 08:09 PM

dont u mean this boat?

http://motors.listings.ebay.co.uk/Ot...istingItemList

K9 racing · 16-03-2005, 08:12 PM

sorry wrong link try this one.........

http://cgi.ebay.co.uk/ws/eBayISAPI.d...535498582&rd=1

TheMutzNuts · 19-03-2005, 01:42 PM

Any of you seen the boss 21 at selsey bill?...its called torque Dirty with a xr2 on it ..
was wondering what the cut out at the back under the transom is for,

scottyboy · 19-03-2005, 02:39 PM

my marshan 19 has that to! think its to provide more water to the prop at high speed or summin not sure!

Jon Fuller · 19-03-2005, 05:52 PM

it's a notched transom, performs the same task as having a stand off bracket.

Gav · 19-03-2005, 07:02 PM

Quote:

Originally posted by Jonny
it's a notched transom, performs the same task as having a stand off bracket.

Can you explain further jonny?
The notch in my transom according to haines is called the "Venturi effect" ??

Jon Fuller · 19-03-2005, 08:16 PM

Gav

Yeah, but the notch in the Signature hull is more than just a notch, or at least that’s what they claim

Having your drive/lower unit set back, or stood off, is about trying to go quicker.

As I see it, there are two perceived advantages, although I'm sceptical about them, or at least I am where offshore use is concerned when using regular V bottoms & drives.

The first advantage is, when you're trying to go really quick, especially in a mono, with the increase in speed, the centre of lift moves further and further aft. As this happens, and gets well behind the C of G, it becomes harder and harder to attain positive trim (bow up) so the wetted area increases, ..no good! Basically, there's insufficient leverage between drive and transom to get the desired boat trim.

Setting the motor/drive off from the transom effectively increases this leverage enabling a more bow up attitude, lessening the wetted area, and letting the speed increase.

A notched transom does the same thing, basically moving the last point of contact between water and boat forward in relation to the motor/drive.

The effect is two fold, coz you change the relationship between C of G, and centre of lift, AND you also increase the leverage the motor has when trimmed out to ‘hike’ the bow up.
-----------------------------------

Second advantage

Trying to run a motor really high on the transom to reduce drag/increase speed, can cause all sorts of trouble getting on plane, as the prop will ventilate at quite low speed as the transom 'dries'.

Set the motor back 6" and the prop will get water, and ventilate less, as the water leaves the transom rising steeply at low speed, and then drops to closer to level when you get going quick, so in theory, set back is a win-win situation, although I'm not a huge fan for offshore, as I said.

All this is of course my own perception and humble opinion, and I would welcome input from any other members who have a view on the subject.

Gav · 19-03-2005, 08:34 PM

mmmm, interesting......

the signature notch is a vented notch which i presume sucks air down to the notch to reduce drag? and also as you say theoretically sets the prop back........

But wouldnt pulling air down to the notch airate the water prior to hitting the prop,therefore wouldnt be running in "good" water??

Jon Fuller · 19-03-2005, 08:51 PM

I would think the idea of venting, is to allow the water to leave the step clean, because it's not being sucked up (ie, low pressure in step/notch area relieved by venting.)

I dunno really.

Adam might throw some light on it, but he may not have seen the Sig bottom.

Gav · 19-03-2005, 09:04 PM

heres a pic of the notch/vent