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Solve Weight & Balance questions with the CX3 Flight Computer
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- Опубліковано 26 січ 2021
- In this video, we will show you how to solve Weight & Balance questions with the ASA CX3 Flight Computer. If you are studying for your Private Pilot certificate, this will save you time during the written exam!
We go over all the figures in the Testing Supplement and explain 4 of the main questions, with step by step explanation.
If you are looking for more CX3 tutorials and a whole lot of Private Pilot knowledge, consider our Private Pilot Made Easy ground school: www.pilotinstitute.com/course...
At 27:43 in regards to Figure 61, I've found how to calculate it on the CX-3. It's similar to the problem you just did previously actually. First lets start with the written question and given answers:
(Refer to Figure 61 above.) If 50 pounds of weight is located at point X and 100 pounds at point Z, how much weight must be located at point Y to balance the plank?
A. 30 pounds
B. 50 pounds
C. 300 pounds
So, once again, it's a balancing act. Object Z has to have the same moment as the other 2 objects.
1) Set RF to "1"
2) Set weight to 100 pounds
3) Set arm to 100 inches
This gets you a moment of 10,000. Now you need to make sure the other 2 balance out, and they already give you one.
4) Add item 2 and set weight to 50 pounds
5) Set arm to 50 inches.
This gives you a moment of 2500, so now you're solving for Y, which would look like this 2,500 + (Y x 25) = 10,000. Which would simplify to
Y x 25(arm) = 7,500(moment).
6) Add item 3, and set the ARM to 25 inches
7) Set Moment to 7,500
And your resulting Weight needed to balance the items is 300 pounds.
Thank You for your helpful videos. They are a life saver. I know this is a year late, but I hope you see this.
Thanks for explaining this problem! I noticed in his explanation (and in yours) that it's pretty easy to do all of the calculation in the weight and balance section, without having to remember numbers and switch to the calculator.
Item #1 (Z) moment is 10,000
Item #2 (X) moment is 2,500
A simple calculation you can do in your head tells us that "Y" must be equal to 7,500 in order to balance the two sides.
We can then simply add a third item in the weight balance section, plug in 7,500 for the moment, and 25 inches for the arm, and we get the 300lbs under the weight category as our final answer.
I find this a little bit easier for me, as I can get a little confused when trying to remember numbers for a formula, and scratch paper just kills trees 🙃.
@@robbied5157 Couldn't remember formulas, but with @SherwoodsCrafts solution and your follow up, I nailed it on the CX-3. Great job y'all!
After watching your video, I switched over to the CX-3 "Weight Shift Formula" option under W/B. The calculator option you presented is easier, in my opinion, but I wanted to see if I could make it work under Weight Shift Formula and I did. I've never used Weight Shift Formula before, so check my math.
Under Weight and Balance, continue as you did. Add your items and get your results. The results are Weight = 450 pounds, Moment = 8000 Inch Pounds, and Center of Gravity (CG) = 17.78.
Switch over to Weight Shift Formula and add your numbers = Item Weight for the "left side" is 500 pounds = enter that in Item Wt.
Total Weight from the original result is 450 pounds. Enter that in the Total Wt.
Center of Gravity (CG) from the original result is 17.78. Enter that in the CG box.
The CX-3 then outputs "Arm = 16.00 In" - so the answer is 16.
The way I solved question 61 using the CX3 is by entering the distances on the left side of the fulcrum as negative and to the right positive. All weights are positive.
So Item1 is X @ 50lbs at -50in. = -2500lb-in
Item 2 is Z @ 100lbs at 100in. = 10000lb-in
Now before entering item 3 Y, look at the current moment. It will be 7500lb-in. You need this to be zero to be balanced, so in item 3 enter -7500lb-in and -25in and Boom 300lbs will be calculated for Y.
As a double check look at the totals and the CG and Mom should be zero.
BTW, I did all of the balance questions this way and it work pretty good!
Thank you so much for covering this! I'm taking the test soon and this has helped immensely.
Amazing video! Keep 'em coming and I'll make sure to use the CX-3 once I take my PPL Exam!
Your videos are great. I just got this calculator and have watched two of your videos so far. At the same time I am very frustrated because I didn’t know about you before I signed up for Sportys private pilot course. It’s good and I learned a lot, however I feel like they left out a TON of information. They didn’t go over any of the calculations stuff, well if you consider just breezing past it and talking ruffly about it and not how to do it as going over it, then that’s what happened. I am doing all of their practice questions and not a single calculation question. I am not sure how in the world I would pass this test off this company’s program alone. I have been using UA-cam to study for my test more then their stuff. Very frustrating. But again your videos are great. Thank you!!
You are correct! The Sportys private pilot course is pretty lame. I have learned much more on UA-cam.
Did you take it yet?
Did u pass??
I'm in the same boat. Sporty's was a waste of money and nothing but an extended advertisment for their products.
Wow, what an underrated video. 10/10 clarity.
Thank you, JBrooks
One of the most useful and easy to understand videos I've seen!!! Thank you!!!
The absolute best W&B video on UA-cam!
Omg, I’m so glad I found this video!! I purchased another online flight school program that hasn’t been helping me much with explaining things like your video just did! I’m going to switch to your program! I can already tell I’ll be working smarter, not harder, following your advice and instructions!!!
Great to hear! Welcome on board!
Watching your videos because I ordered one, I am excited to not be using pen and pencil when I take my written.
SERIOUSLY! You are the best! PLEASE! keep them coming!
Wonderful review here. Thanks!
Such a well put together video!
GREAT Video, THANK YOU for sharing.
Thanks, great info!
awsome thank you !!
Wow, thank you so much for this.
I know its a small amount but need the rest for my test fee. 😛 Thanks again!
You guys rock!
Great video mate but that plank got me beat I did it with a Calculator I could not do it with the ASA-CX3 Thank you for this video mate nice one
Thanks, great video
Great video
Never mind I got it. Thanks for the video
Thank you!
How would you calculate weight shift
Awesome! Do you have a discount code for the CX3?
Any idea if we’re allowed to use these on EASA exams beyond the PPL?
I had to do my PPL with only an E6B and a piece of paper and it was a pain.
damn this lil thing is awesome as hell
Hey there thank you for trying help us simplify weight shift formulas. Can you show another video on how to use the cx3 for this question please? (Refer to Figures 32 and 33.) Upon landing, the front passenger (180 pounds) departs the airplane. A rear passenger (204 pounds) moves to the front passenger position. What effect does this have on the CG if the airplane weighed 2,690 pounds and the MOM/100 was 2,260 just prior to the passenger
transter？it’s on my prepware and it’s driving me nuts. Also any update on fig. 61? Appreciate you
I followed the directions and video on the second example although I did not get a total. I entered everything correctly just not totally up????? What am I doing wrong?
This CX-3 his the best think iv ever used its great just a matter of time to work it out. Thank you for this video mate How much is it to join this training school Anyone know
Hi Steve, glad you liked the video, our ground school is available here: www.pilotinstitute.com/course/part-61-private-pilot/
The best! I wonder how do we use weight shift formula function on CX3?
I was wondering this too ?! Did you ever find out ?
Is the CX3 limited to only 8 w/B items? Or is there a way to add more than 8? I'm prepping for the ATM written now.
Yes it is indeed limited but I don't think there are many scenarios where you'd have more than that.
I'd like to point out a couple of things here (I've recently acquired a CX-3 and have been using it for my commercial certificate study).
First, it looks like you have selected the "Daylight" theme selected, which I assume works well for the videos, but when you scroll to the "Totals" part of the weight and balance, the numbers do not show up on the video until you scroll to them., I've noticed that they are very faint for my when I look directly at the display, and become more apparent at an angle. I use the "Night" theme which does not have this problem.
Secondly, and probably more importantly, I found that when entering numbers into an item in the weight and balance, sometimes, if you enter the moment first then the weight, the moment entry is deleted. This confused me for some time. If you look at 11 minutes and 10 seconds into your video you will see that this happens, and you have to go back to the moment and hit the square button to re-enter the moment.
Yes, we realized too late that the night mode would have been better. And yes, that "bug" is a bit annoying if you enter more than 2 out of the 3 values.
Around the 22 minute mark, there's the CG problem involving repositioning of weight balanced on a plank and fulcrum. Is there a distracting fact in the figure? I believe FAA gives an irrelevant fact that the plank weighs 200 pounds. The way I see it, that 200 pounds is distributed equally across the entire length of the plank...from the far left all the way to the far right, so it has no effect on the center of gravity. Only the positioning of the load the plank is supporting will alter the CG. What are your thoughts?
The 200 pound is indeed very important for the question because the fulcrum is not located right in the middle of the plank so the 200 ft plank will create its own momentum.
@@PilotInstitute An "undo" button would be helpful here. Major face palm on my part. After I posted my question, I realized that in high school physics the plank initially was only a theoretical, massless structure there to help demonstrate the relationship between weight placement and distance from the fulcrum. Fast forward about a week further into high school and we're introduced to the reality that the mass of the support is, in fact, relevant. I feel pretty stupid about that. Now back to your course which I'm loving by the way.
How can I buy this calculator for my private written
Sadly they have been difficult to find recently. Try amazon or possibly Ebay.
Excuse me, could you help me, I tried to update my cx3 flight computer and now it won't turn on, you don't know how to restore it?
I'm actually not sure. Did you check the user manual?
What are the Questions for Figure 61??
They typically involve determining the weight of an object if the other objects weigh a certain amount. If you're in our course, we go over this figure.
How the UI is purple ?
The magic of photoshop :)
@@gregreverdiau246 😂😂 I was getting mad to do this
Here is how u do Figure 61:
Put "Z" in "item 1"
(In my case it was 100lb arm 100'')
Put "X" in "Item 2"
(50lb and *-50 arm*)
Put "Y" in "item 3"
-25 ARM and just test out the weight options until the total moments and CG reads: 0
You are on the right track here. Instead of guessing the answers you can then take the result of Total weight, and CG. Then press W/B button again and go to "weight Shift formula" input these values into the Total Weight and CG inputs then input Y's Arm into the Arm input and presto you get the needed weight of Y on the top line "item Weight"
He is woody from Toy Story