Planked Boats Fastenings
ALL FASTENINGS MUST BE HOT DIPPED GALVANIZED
Hot dipped galvanized fastenings have a dull grey and rough surface because of a thick zinc-coating. Electroplated fastenings which are also sold as" galvanized" have a shiny, smooth and silvery surface. The zinc coating is very thin and gives no protection in salt water. Always specify" hot dipped galvanized" not just "galvanized"
NAILS
If specially made boatnalls are available they are the best choice. Boatnails are square in section and are thick in relation to the length. In most developing countries these nails cannot be bought locally. Round wirenails are however widely available. Used for house construction they are thin In relation to the length. When used for boat building they must be cut down in length before galvanizing, or a special order made from the nail factory. Tests have shown that round wire nails are as strong as square nails provided the diometer is equivqlent. It is important that the head of the nail is large, about twice the diameter of the nail.
For the boats in this publication three sizes of nails are required. Predrilling must be done for all nails.
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BOAT NAIL
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ROUND WIRE NAIL DIAMETER LENGTH PREDRILL 
CUP - SQUARE COACH BOLT Lenath CUP - SQUARE COACH BOLT Lenath 
Minimum 2.5 mm for 8mm bolt 3 mm for 10 mm bolt HEXAGONAL HEAD BOLT t_Length Minimum 2.5 mm for 8mm bolt 3 mm for 10 mm bolt HEXAGONAL HEAD BOLT t_Length
If round washers are not available use square washers of same thickness and width as round washers. The nailhead should be countersunk about 2-3 mm for the 4 mm nail and 4 mm for the larger nails and it will in harder wood be necessary to predrill for this before drilling the main hole, The nailhead should be covered with mastic to assist against corrosion. BOLTSCoach bolts also called carriage bolts or more correctly cup-square coach bolts are used in boat building but they are increasingly being seen as "specials" and often only made with an electroplated finish. Ordinary hexagonal head steelbolts are easier to buy hot dipped galvanized. For timber construction they must be fitted with large washers. Most bolts for the boats In this publication are 8 mm and normally not available in lengths above 120 mm, Longer bolts must be made from a hot dipped galvanized rod and threaded in both ends. The zinc-coating on the nut will provide some protection also for the bare threads, but in addition the threaded part should be smeared with bitumastic compound before inserting the bolt. Rods threaded all along should not be used since the bearing area against the wood is reduced. THREADED BOLT
  
20 X 20 X 
Gtoove^P^ bort Gtoove^P^ bort   
mawwames. 
tempotoiy fte, s tempotoiy fte, 4x50 ptedtffl 3.5
1 and 2
FRAME 1 and 2 
2 Mark a Vine be\o* bottom Vine. 
-s, otaw a Vine trough the two 
1 Mark a line the of the chine width 2 Mark a Vine be\o* bottom Vine. -s, otaw a Vine trough the two points A cut oft the frame along the Vine m Mark
Mark Hold outer edge of plank against this point Hold outer edge of plank against this point Make a second copy Make a second copy 
 
Draw a curve through these points Draw a curve through these points 
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