Godden DLG Fin
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The first table contains the theory for the first Fins I have made. I've included both a symmetrical and semi' sections and show both as in the theory there is a marked difference.

Design Calculated Fin Weights!!
   Root Section Tip
Section		 Span Root Chord Tip Chord Panel Area Panel Volume Foam Density Weight
mm mm mm  mm2 mm3 kg/m3 g
My DLG - Upper Fin
(Floormate 200-x)		 HT12 HT12 150.00 80.00 62.35 10676.25 22699.62 32 0.73
My DLG - Lower Fin
(Floormate 200-x)		 HT12 HT12 75.00 80.00 71.18 5669.25 12750.72 32 0.41

Total

   Total Fin Core Weight 1.13
My DLG - Upper Fin
(Floormate 200-x)		 HT23 HT23 150.00 80.00 62.35 10674.86 30311.69 32 0.97
My DLG - Lower Fin
(Floormate 200-x)		 HT23 HT23 75.00 80.00 71.18 5668.51 17026.55 32 0.54

Total

  

Total Fin Core Weight

 1.51

Here is a picture of the Fins as at 13th March 2004 (Close-ups lower down the page)

The next table is "work in progress", showing the data as I collect it. (8 Fins so far).

Fin Build Weights Table

Fin Number

 1 2 3 4 5 6 7 8      
Stage
Airfoil Section HT12 HT12 HT12 HT12 HT12 HT12 HT12 HT12      
Cores - Raw n/m n/m n/m n/m 2.6 2.9 2.8 2.8      
Cores - Sanded 2.6 2.6 2.6 2.5 2.3 2.1 2.0 2.0      
Spar Material n/a 0.4 0.4 0.5 n/a n/a n/a n/a      
Skin (with backing) 4.9 4.5 n/m n/m n/m n/m n/m -      
Core with LE 3.0 3.1 3.1 3.1 2.4 2.1 2.2 2.2      

After bagging
Raw from Bag 8.7 8.0 7.4 7.6 6.7 5.8 6.4 -      
Trimmed 8.5 7.9 6.7 6.8 5.9 5.3 5.8 -      
With mounting hard points 8.9 8.2 - - n/a n/a n/a -      

Fin Lay-ups used:
Fin 1 was 20/20 sheared 1.7Oz Kevlar front and 45/45 1.7Oz Kevlar rear. Composite glass(0.75 Oz)/Kevlar(1.7Oz) LE Fabric.
Fin 2 was 45/45 Kevlar all over - uni-carbon spar on side. Composite glass(0.75 Oz)/Kevlar(1.7 Oz) LE Fabric.
Fin 3 was 45/45 Glass (0.75 Oz) - uni-carbon spar on side. Composite glass(0.75 Oz)/Kevlar(1.7 Oz) LE Fabric.
Fin 4 was 45/45 Glass (0.75 Oz) - uni-carbon spar on side. Composite glass(0.75 Oz)/Kevlar(1.7 Oz) LE Fabric.
Fin 5 was 1 Oz Kevlar 20/20 LE, 45/45 TE. With a 0.75Oz Glass LE. 
Fin 6 was 1 Oz Kevlar 20/20 LE, 45/45 TE. With a 0.75Oz Glass LE.  *** BEST YET ***
Fin 7 was 1 Oz Kevlar 20/20 LE, 45/45 TE. With a 0.75Oz Glass LE.
Fin 8 is a raw joined core at the moment. With a 0.75Oz Glass LE.

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More Fin Pictures here...

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