What about the weight of the plank (1/3 of it) on the left? Nobody explains this very well and it is very confusing. Also showing TWO separate 45" on the plank adds to the confusion greatly. Like the plank is 90" long and is 45" each side of (its) CG. And implying greatly that there is 2/3 of the plank (15" + 45" to the fulcrum (which weighs 200lbs) on the right side and 30" (45" - 15") on the left side. Which puts me into a mode of calculating the moment for part of the plank on each side and factoring this in. Every instructor I talk to says to just memorize the answer don't get hung up on things like this and move on. I'm frustrated. Every video I have seen does not explain this very well and they treat the plank like it's just a weight and a moment on the right side. I sort of get it with the CG ting but not entirely and it really needs to be explained much better in my opinion. I guess it's being treated like basic empty weight on an airframe would be treated where all you get is the moment of the CG and the basic empty weight. But in all cases when it comes to this problem I have not seen it explained in a way that clearly makes sense to me. I think I just now talked myself into understanding it better. But I am not sure.
A little confusing to me too. But it does make a bit of sense if you think about it. Imagine 3 foot (36") long bag of 10 pounds is sitting in a baggage compartment. the front of the bag is, say, 20" aft of datum, the back of the bag is 56" aft of datum. That bag affects the CG in the same manner as 10 pounds just balancing on one tiny point.... Thats the best way i can put it into words
This is super confusing at first but you don't need to divide up the plank. Just like with the boxes you use the total weight, not one side of it. You just need the total weight of the plank and the arm (fulcrum to CG) to get your moment. Trying to find the balance of the plank independently screws everything up.
thanks for your video, I'm studying for my written in 2 weeks! :)
What about the weight of the plank (1/3 of it) on the left?
Nobody explains this very well and it is very confusing.
Also showing TWO separate 45" on the plank adds to the confusion greatly.
Like the plank is 90" long and is 45" each side of (its) CG.
And implying greatly that there is 2/3 of the plank (15" + 45" to the fulcrum (which weighs 200lbs) on the right side and 30" (45" - 15") on the left side.
Which puts me into a mode of calculating the moment for part of the plank on each side and factoring this in.
Every instructor I talk to says to just memorize the answer don't get hung up on things like this and move on.
I'm frustrated.
Every video I have seen does not explain this very well and they treat the plank like it's just a weight and a moment on the right side.
I sort of get it with the CG ting but not entirely and it really needs to be explained much better in my opinion.
I guess it's being treated like basic empty weight on an airframe would be treated where all you get is the moment of the CG and the basic empty weight.
But in all cases when it comes to this problem I have not seen it explained in a way that clearly makes sense to me.
I think I just now talked myself into understanding it better.
But I am not sure.
same question here
@@Dou8leShot I agree ... total BS question!
A little confusing to me too. But it does make a bit of sense if you think about it. Imagine 3 foot (36") long bag of 10 pounds is sitting in a baggage compartment. the front of the bag is, say, 20" aft of datum, the back of the bag is 56" aft of datum. That bag affects the CG in the same manner as 10 pounds just balancing on one tiny point.... Thats the best way i can put it into words
This is super confusing at first but you don't need to divide up the plank. Just like with the boxes you use the total weight, not one side of it. You just need the total weight of the plank and the arm (fulcrum to CG) to get your moment. Trying to find the balance of the plank independently screws everything up.
My hero! Thanks for simplifying this.
It rubs the lotion on its skin...
The equation is a great way to calculate thanks
Thank you
Amazing