hi guys i need some help with sizing wing spar its build from aluminium the spar height is 5.15" and lenght 8' the loads in half of the wing spar is 900 lbs and at attach poin 1990 lbs ,i need to know where i can find a formula to calculate what spar cups i can use my idea is use 0.032 web top and bottom spar cup 7/8x7/8x1/8 2024 t3 tapered from 1/2 span of spar and 7/8x1/8 another plate running on other side of web to half of spar top and bottom the spar is stressed to 3.8g' thank you