Free beam maximum moment problem 6

[Sean99]

Hello All, I'm trying to figure out the maximum moment for a free beam that has a few forces on it. It's meant to model a tailsitter aircraft that has two motors producing thrust on the ends of its main spar. The idea is to understand the maximum moment on the main spar.

Please review the picture provided.

The 10 N forces is mean to symbolize the thrust produce by each motor, and the 2 N is mean to symbolize payload weight, The length of the beam is 0.5 meters. How can I go about calculating the maximum moment on this spar?

Thanks for everyone's help!!

 

[Ng2020]

Am I missing something or is this just a simple dynamics problem? Consider this analogy: an airplane executes a 2g balance manoeuvre. Inertial loads (mass *2g) are placed in equilibrium with the external aerodynamic loads (again mass*2g), from there balanced freebodies can be produced and the calculation of internal loads is a straightforward problem.

So;
1. Determine the load factor on your vehicle: you know the mass and the external loads, so what is its acceleration?

2. Develop a balanced complete freebody by placing your external loads (thrust) in equilibrium with inertial loads, given the load factor from (1).

3. Take section cuts to compute internal loads. Job done.

 

[Sean99]

rb1957, thanks for your response, good point.

Ng2020, also very good points.

OK GUYS, I THINK IVE GOT IT NOW, I'm officially closing this thread, or at least the OP, which is me, is no longer going to be responding. Thanks for everyone's contributions, it's quite clear to me now.