- #1

Leo Liu

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My school's group project is to design a powered model flying wing that can fly for as long as possible. To make it stable in the longitudinal direction, we either have to use a swept wing design or an airfoil with reflex (like BR1). We are forced to use wing sweep because the airfoil with reflex cannot create enough lift.

A rule of thumb I found for the sweep angle is about ##20^\circ## for a model flying wing. I am not sure if it is optimal and am keen to know if there is a way to treat this topic more rigorously.

I did some research and was not able to find a rule-of-thumb formula for ##C_L##, ##C_D##, and ##C_M##. The closest thing I can find is this research.

I am wondering if such a formula exists, and if not, how we should estimate the changes in the three coefficients. Do we just apply a guessed margin and call it a day?

Another question I would like to ask is what are the factors and influences we need to consider when deciding the locations to mount the motors and propellers. Would it be more beneficial to put them at the leading edge or at the trailing edge?

The initial design of our flying wing:

Your input will be highly appreciated. Have a good one!

A rule of thumb I found for the sweep angle is about ##20^\circ## for a model flying wing. I am not sure if it is optimal and am keen to know if there is a way to treat this topic more rigorously.

I did some research and was not able to find a rule-of-thumb formula for ##C_L##, ##C_D##, and ##C_M##. The closest thing I can find is this research.

I am wondering if such a formula exists, and if not, how we should estimate the changes in the three coefficients. Do we just apply a guessed margin and call it a day?

Another question I would like to ask is what are the factors and influences we need to consider when deciding the locations to mount the motors and propellers. Would it be more beneficial to put them at the leading edge or at the trailing edge?

The initial design of our flying wing:

Your input will be highly appreciated. Have a good one!

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