AIT Around In Ten

Tad thanks for the post on Robert Crawford very good reading
and more here
http://www.oceanslogic.com/interviews/robert-crawford/

 

Black Feathers

 

Well folks I have spent days and days on this design.
The basic idea is to finish my boat
http://www.boatdesign.net/forums/boat-building/manies-microcruiser-27869.html
and then build a "TEN"
I am absolutely fascinated by the entire concept and as I do all my sailing alone anyway I would love to build and sail a "TEN"

My concept is still the same = dry bed up front
3m long x 1,6m wide
full keel
inside steering

What is very interesting is that you can easily accommodate 100 days of provisions and water in this boat with a max displacement of 1200 kgs. (light ship = 1000 kg)
300 kg = boat
100 kg = 4 x 105 A batteries as ballast under bed
200 kg/l = water under bed
100 kg = food (1kg /day) stored on sides next to bed
300 kg = skipper and all other extras
200 kg = unknown

My design has now come down to a 1,6m beam
she is slightly wider on deck towards the stern to make the seating area more comfortable
and underwater she is wider up front narrowing down towards the stern

this has given me an unbelievable resistance of 600 watts @ 5 kn @ 1200 kgs @ 480 mm draft

now I know full well that these figures mean very little in the real world BUT they have proved to be remarkably accurate and "interesting" on my present boat
so the days spent on this design has been a lot of fun
tweaking and tweaking the design

The point I am making here is that the concept of the ten foot boat is totally do-able and when there is a lot of good info going around more people will get it right.

 

oh and I must add
the swim platform is a must
an outboard could be mounted on the swim platform structure

 

Looks very nice. Would the long keel on the "Manie10" really need to be that deep? If an AIT can be trailerable and easy to launch singlehanded, and be safe and enjoyable also in light deplacement mode for day cruising/weekend overnight trips, in sometimes shallow waters, I reckon it would give more bang for the bucks for the sailor who might not cast off for the full lap.

 

MoeJoe after I saw the hammering that Cape Town winds gave the Cape to Rio racers I realised that even just to sail around the cape is a daunting task.
It's a case of when that wind hits you the pooop is gonna fly.

I agree with you if you have nice waters, then definitely no need for the "heavy duty"

 

Well I've spent a bit more time fine tuning the design.
There is 500 litres of storage on either side of the bunk (1000 L total)
I would describe this as "food" etc. storage
Under the bunk is another 450 litres of space basically for batteries and water.
I feel that this is probably adequate storage space as there is still a bit of space under the seats in the "enclosed" cockpit area.
The swim platform is a very definite addition.

So that's my take on the subject
comfortable bunk behind "doors" to always be dry
good seats for sitting on the lee-side
nice standing area in good weather (similar to what I have)
and a swim platform for the days when there is no wind, just to "get out" a bit
big 80 amp solar panel
forward hatch to get to the anchor

AND my next experimental balanced lug sail with roller reefing on the boom.

general technical data still the same
length 3m - beam 1.6m - draft 0.4m @ 1000 kgs displacement
keels 0.2m deep = 0.6m total draft
600 watts resistance @ 5 knots

 

Much better
less resistance for same payload
slightly shallower draft
more storage space

this is starting to look like it

 

a)

If you carry an AIS transponder large ships will get an alarm when they are on collision course . . :idea:

To be proactive an AIS transceiver would be nice too, but I don't know if an AIS transceiver's power consumption is feasible on a AIT boat . .

About costs

b) + c)

Solo voyager Roger Taylor and his boat Mingming II

 

Sven Yrvind, September 14, 2011:

 

I see a "ten" as a boat that could be good for 3 to 4 month long trips.
If you wanted to do a "lap" non-stop like Sven, it becomes a totally different complex problem.

So what I found interesting is that I can have 4 x 105 amp batteries as ballast. Having these batteries under the bed/bunk and 200 litres of water also under the bed you have all the ballast you could wish for.

That is why I found that by making the boat a bit wider on top I can comfortably fit an 120 watt panel on the cabin roof. also have a wind generator??? and also have a generator that you tow behind the boat like Rory McDougall towed behind Cookie on that Jester trip???

So I see the electrical system as TOP priority because as Sven said so correctly "modern electronics has made boating safer"
Now you can have AIS transponder and chart plotter and depth sounder in one package. Add to that a ST1000 tiller pilot and a radio and you are pretty OK.

What I have found to be fantastic is the new Induction cooking tops. My daughter has one at university and they are FANTASTIC I will definitely have one on the boat soon. Super efficient - safe AND no open flame for cooking

So what I am working on at the moment is to design the interior "packing" spaces. I must add it is difficult and very time consuming

This "ten" story is a very interesting topic, maybe I cant sail around the world BUT I can build one and just go and have fun.

So that the plan

 

Updated drawings
beam on waterline = 1400 and much better
drag reduced by 30%
solar panel 1510 mm x 680 mm x 120 watts !!!!
and new sail = roller reefing on boom

 

Hi Manie,

Why not give the center keel a NACA profile, like in Steve's design post #59, and put the heaviest stuff in there . . . ? ? ?

 

The keels are all NACA profiles including the rudder
the idea is to keep them "slim" and narrow
the stability calculations are pretty OK with the ballast under the bunk
what is interesting is that 100 days supplies and 4x batteries is already a lot of ballast in it's own right.

What is interesting is that Sven has the bronze shoes and he doesn't like keels that why I think he went for the retractable daggerboard :?:

 

Lead

Big Question

What do you folks think lead should be on a boat like this ?????
Should the rudder be added as underwater profile for lead calculations or not = calculating CLR (CE is easy)

Larsonn & Eliasson page 172 would indicate anywhere between 12 to 16 % and more ??????

The big problem is that there is no data available for a 3m displacement boat with a full keel.

Tricky question ????