rs 800 centerboard

[john_hamilton]

i am planning to make my new centerboard the same section as an rs800s to aid easy temp replacement if it breaks. I know the rs800 has a NACA 03010 section but does anyone know the chord?
thanks
john

[Will_Lee]

280mm I think, but there is no substitute for measuring.

[john_hamilton]

ill try and find someone at the blast at draycote with one.

[peter_barton]

I have measured mine; 288mm straight line fore/aft

[JimC]

I don't know that I'd want to take it on trust that a board case, built to that section and chord, would be guaranteed to fit an RS800 plate. Should you want to do this then I suspect the normal advice applies: build the case around the actual foil you are going to use.

[john_hamilton]

iv been asking around for one but havent found it yet. anyone got one (it can be a bit broken but i need the top 30cm of it)

[roland_trim]

I think Jim may be subtly suggesting that you find/make/fix the board you are going to use as a complete optionas step 1, then taylor the boat around it.  I think this may be a wise idea as that way you remove any build/fix/makign irregularities adn the board will then definitely fit.

For EJ the slot was almost the last thing we cut. The board went in after the boat was one object and the racks attached.

[Phil Alderson]

I agree you need to build the board you are going to use first, RS may have planned for the board to be Naca03010 but there is no grantee that it ended up that shape.

Also when you fit the board to the case you should do it with the board in place

[Banshee Ambulance]

I would guess a rs800 board is going to be very heavy too. The board on the Laser 4000 I used to sail was more of a keel! But I have not sailed an 800 in a while so can't remember.

[john_hamilton]

kevin ellway originally suggested using an rs800 board which is why i was asking

[Phil Alderson]

the 800 board is nothing like the 4000 board in terms of weight, and I am sure that it would be a good option.

You just need to take a lot of measurements off one as the manufacturers published measurements and spec may not be quite what they actually produce. and with a tight fitting centerboard it could cause problems.

[phil_kirk]

E-number's Case is more of a crash box. This was made as a sleave of 3 layers of weave/biax/weave with a section of 40 x320mm. At each end I used a pad of High Density foam from which I cut the foil's section.  It was easier to adjust these to get a close fit than the whole case. It also means that should another foil come along the pads could be adjusted to suit. 

An 800 foil is a reasonable substitute if you break the normal foil however it is not going to be as stiff and you will always want your normal board. If you can't get hold of one at present you may not be able to get hold of one at short notice. The other option is to build a spare.

[john_hamilton]

thanks phil. i have got axcess to good condition 800 boards (about 5 of the buggers) but havent been able to find a broken one to get carbon on when building a case. in the end i may just go with a well built foil from your spreadsheets. by the way you have an email

[ross_burkin]

Just wrap the whole thing up and dont get epoxy on it!

[JimC]

Yep... Cover that foil well - apart from anything else you need enough thickness over the actual foil to give yourself some reasonable clearance. Beware of building a case that you can only get the daggerboard into when the air and water temperature are below some critical limit:-)