Wing spar dimensioning

[ultralajt]

Hi!

What max G load and safety factor is reasonable to use at designing vintage scale sailplane model in scale range from about 1:3 to 1:2,5?

I am curently designing a model in 1:2,5 scale that is kind of Grunau Baby variant.

I am thinking that scale sailplane is to fly with care and thats why I chose ultimate load factor of (only) 10. Is this okay or not?

The wing spar caps are made from spruce and I use material strength:

34 N/mm2 for compression
and
64 N/mm2 for tension

What ultimate G load and material data you use for your spar caps sizing?

Mitja

[Christian_B]

I think that your load factor of 10 is perfect for such gliders with spruce spars.
I have an simple excel sheet on my homepage where you can find all the material data I'm using (look under download).

[ultralajt]

Thank you!