Lex, here's the formula I used. Dunno' if it's correct.
The formula for the rudder was:
.02 = area rudder x tail moment/wing area x span
The formula for the stab was:
.46 = area stab x tail moment/wing area x mean average chord
I set up an Excel spread sheet and used the solver function to solve for
the stab area.
The numbers I used are;
>>
>>Wing
>>
>>Mean Average Cord - 6.45
>>Area - 383 sq. in.
>>Span - 59.05"
>>
>>Tail moment arm - 25"
>>
>>Results - HStab area 45.45 sq. in. VStab area - 18.1 sq. in.
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