ce downflood angle

[whoosh]

is there a minimum downflood angle for CE class C , and is there a min vas,
I know abt the min downflood height the boat is 13.77 loa 13.46 dwl
have at mo downflood 39 at sliding door, vas 80
thanks v muchely

[TeddyDiver]

I'm not quite sure but believe there is 30 deg. Maybe someone can verify or give the right info..

[Guillermo]

No, it's not 30º but I cannot remember now. When I come back to the office I'll check and post (If nobody popped up with the correct answer before).

Cheers

[Ad Hoc]

are you talking about a boat classed as "inland" waterways, or "coastal" class C boat?..ie EU inland waterway zone 2?

Guillermo
It is related to freeboard, not an angle...but is dependent upon the boats length

[whoosh]

thanks yes 1/17 of wl I think, it complies there at .830mm, wl 13.5 class c can be coastal to some sea state

[Ad Hoc]

If your vessel is 'sea going' ie not inland waters ways then:

They must have a freeboard to downflooding of not less than 600 mm for vessels of 7 metres in length or under and not less than 1050 mm for vessels of 18 metres in length or over. For a vessel of intermediate length the freeboard to downflooding should be determined by linear interpolation.

From 12.2.2 of THE SMALL COMMERCIAL VESSEL AND PILOT BOAT CODE OF PRACTICE

[whoosh]

If your vessel is 'sea going' ie not inland waters ways then:

They must have a freeboard to downflooding of not less than 600 mm for vessels of 7 metres in length or under and not less than 1050 mm for vessels of 18 metres in length or over. For a vessel of intermediate length the freeboard to downflooding should be determined by linear interpolation.

From 12.2.2 of THE SMALL COMMERCIAL VESSEL AND PILOT BOAT CODE OF PRACTICE
yes thanks, Gulliermo told me that as did a mate in Nl, what abt vas?

[Ad Hoc]

what is "vas"..?

[whoosh]

what is "vas"..?

angle vanishing stability

[Ad Hoc]

Unless you're boat is capabale of lifting cargo of sorts, there is no 'vas' requirement.
However, the 'range of stability' where the GZ must be positive is given in the table.

[whoosh]

to those with interest
for power craft there is no angle vanishing stabilty requirement, only for sailing vessels the odd thing is that our local guy is asking for inclining test when it can all be done in Hydromax

[Guillermo]

Stu,
You need to perform a stability test to accurately determine displacement and CoG position. Then you feed Hydromax or whatever other program with such data to check the fullfilment of the mandatory criteria at the different load conditions.

Cheers.

[whoosh]

oh darn!!! I was hoping to fiddle the books, tee hee its ok dont that a few times, surveyer used to put sandbags at certain height and at 2/3rd beam to determine the number of pax. that my water taxis could seat, as you can see I ran a very tidy place, always chaotic near launch time

[Ad Hoc]

"...the odd thing our local guy is asking for inclining test when it can all be done in Hydromax.."

To suggest that an inclining expt can be done in a computer program speaks volumes!...

[whoosh]

"...the odd thing our local guy is asking for inclining test when it can all be done in Hydromax.."

To suggest that an inclining expt can be done in a computer program speaks volumes!...

you can put any cog you like in there, but you have to prove it, physically

[CowMan]

Yes, please do the inclining test, and have it done well. Here in Newfoundland, the story of the Ryan's Commander is an excellent example of why: It handled well on sea-trials, and did have half an inclining test done; however, a complete inclining test would have shown the appearant initial stability disappeared quickly at higher angles of heel. It sank with loss of life early in its career. The computer simulations are only as good as the data fed them and the fidelity of their calculations.