The TRUTH About Wing Cube Loading
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- Опубликовано: 1 дек 2023
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I have been waiting for this episode. Fun and super useful! You guys are the best RC channel and knowledge source.
Thank you!
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Another highly useful parameter I use to determine flight characteristics and a general idea of what to expect for maidens of new arfs and scratch-builds is what I call a "Performance Factor". It combines Cubic Loading with Displacement loading.
Displacement Loading = Weight / HP
The Displacement Loading is useful for assessment what flight category your plane is in - Trainer, Scale, Sport, Pattern, 3D Hucker, etc., not just the powerloading (watts/lb).
Performance Factor = Cubic Loading * Displacement Loading
The Performance Factor is useful for assessment to see if the plane has enough power for the given aircraft and flight category, or not, or too much, or if the aircraft is too light or heavy for the wing cubic loading or powerloading or both.
For example: airplane is 21oz, 36" span, 252in^2 wingarea, design cruise of 25mph, and the propeller absorbs 100 watts of power (static), and also assuming you have a propeller that is matched well enough for the motor and airframe.
Here are the results:
SpanLoading = 7oz/ft
Wingloading = 12oz/ft^2
Cubicloading = 9.07oz/ft^3
Powerloading = 9.81lb/HP
Powerloading = 76watts/lb
Displacement Loading = 19.62lbs/in^3
Performance Factor = 178 oz/ft^3
This example aircraft is most definitely categorized as a trainer that is docile, predictable, stable, and easy to fly.
Other useful scaling terms to know are:
Scale Factor of Full Size = K
Acceleration = K^0
Dimensions = K^1
Areas = K^2
Volumes = K^3
Weights = K^3
Forces = K^3
Time = K^0.5
Velocity = K^0.5
Power = K^3.5
Thrust = K^3
Wing Loading by Area = K^1
Wing Loading by Volume (aka Cubic Loading) = K^0
Power Loading = 1 / K^0.5
Notice the Cubic Loadings exponent is zero, just like acceleration - It's unquantifiable, 'unrelatable' - cannot be directly assessed. All of these parameters are useful for a better determination/expectation for a given aircraft. This is why I use the Performance Factor as it combines both.
You should make an ILS or RNAV system for the fpv goggles in your planes. Then if you can’t see the runway in snowy or foggy weather you can use that. I have no ideas how but probably a lot of electronic stuff.
Let's goo!!!!! finally i needed this! thanks!
love the video! When is the twin otter video coming out, ive been waiting. Keep up the videos though :)
I need a new Funcub, thanks for reminding me!
Interesting and very informative. Unless I miss something, WCL addresses the optical illusions associated with RC's outside perspective. Maybe that's why we hear less about wing cube loading in full scale and FPV. Or are we still influenced by the craft's size when we view the world from the cockpit? A fascinating question ...
I built a funcub myself and its awsome, with styrofoam
Bit of a funny question, but, when calculating wing size are you supposed to measure wingtip to wingtip or just each wings length added together ignoring fuselage? I'd ask on the discord but usually get ignored.
For once, I’m just in time. This Will be useful. Love this content, you’ve inspired me to try a bush conversion of my small plane.
That Slow Ultra Stick in the winners photo definitely doesn't look like any Slow Ultra Stick I've ever seen! Thicc tube, suspension(?), bush tires, and an all black tail? I sense some wizardry going on here!
So what your saying is that a pound of feathers will fly better then a pound of bricks?
You guys should do an episode on having people try guessing a planes wing cube loading while flying it to see who gets the closest
Great info! I had never even heard of this
I'm always blown away by your exceptional talent/knowledge to produce these videos......I always learn something and smile after each one......TY for all you do.
Thanks, Lee! Glad you enjoyed it.
Does wing _thickness_ have any noteworthy effect on plane floatiness? Obviously it's heavier than a thinner wing, but the lift produced should increase by more than the _total_ aircraft weight up to some point
Wing thickness is referred to as "airfoil profile" in the aero engineering world. It can have a big effect on how an airplane stalls, and *could* make it *seem* floaty, sure. We verified this with one of our "not armchair engineer" friends who helps edit some of our scripts. Hope it helps!
Brickplane!
Ok, which one of you gentlemen was able to wake up Einstein?? :)
Very intriguing and useful video.
AirHammer out!!
i litteraly owe most of my rc plane knowledge to you guys and i love ur videos so much, are you going to post more content like you did before?
Thank you! That’s awesome. What content are you referencing?
What's the name of the RC plane at 3:06? Great video.
That’s one of the many variations of a Mudgy! 👍 Thanks for watching.
Awww, you mean we don't get a real plane of our choosing for winning? what a shame lol
Hey in all seriousness though thanks for braking down wink loading, its something i have been meaning to look up but frankly didn't care enough about i kept putting it off, you guys made it easy so thank you lol
amazing video for sure buying the calander!
Wassup
I just purchased the calendar for my airplane garage. This video brings together some common sense experience from flying different planes with some science. Interesting and original.
I just crashed my twin timber into a Tesla 😂 (it was my Tesla) 😂
Hahahaha
☠️
Why did your Tesla self-drive itself into the path of your twimber??
Watch the latest video, he put you as an example🤣🤣
So like, I tried using the formula at 1:02 to calculate the wing loading of my airship and then my calculator exploded.
just crashed my rc airplane today 😃 perfect timing flying in 43 km/h wind is not good idea for 70cm wingspan cute cessna
16th!
yoooooooo, been waiting for so long
Were those pieces of wings stuck in the ground when the timber was hovering if so I'm going to have to make me some of that yard art
Im 13 and just got into the rc with my friend. I have a small p51 plane and he has an f4u crosier. Can you give us some advise?
How’s the flying going
I had to watch a few times. But, this is the absolute best explanation for all things "wing loading" that I've seen. I figured id never get it- just some type of dark magic that I'd never really grasp. Like Anti-matter. Or why some people just have no idea how badly they need to wear deodorant.
You guys nailed it! Best instructional video ever!
Now, can you guys teach me about Anti-matter? 👍
Thanks! So glad the video helped you conceptualize it. 😁 Anti-matter? I’ve heard you just need to watch Angels & Demons for that explanation. 😜 -Zach
ah i remember you were talking abt this in the discord 👍
Hey looking for some guidance. I’m looking to do a motor swap in my FMS 1700 pa super cub. Looking to get more power out of it. Would you guys have any suggestions?
The WCL of my 2 meter X-Dream F5RES is 2.02 and that's without trying too hard to keep the weight down
Gawd that mow job looks good at that one field!😅😅
Firstttt
Fo
First
Give me back my radian! I know it’s in your yard man!
He stole my fun cub😢
Cube loading real
Day 75 asking for a gasser video
My calculator doesn't do those stuffs.
it does
what are the units of wcl? first you say it's a made up metric, then you say it's a more accurate measure to compare models, then you say different models need different wcl's. i was always suspicious of you using wcl instead of the standard wing loading. this video didn't exactly help.
Wing cube loading is dimensionless
The units are technically ounces per square foot^1.5. But that’s not very helpful so it’s usually ignored. Using wing loading on its own to compare airplanes becomes an issue when you compare different sized airplanes. For example - a UMX turbo timber when compared to a regular sized Timber evo. The UMX Turbo Timber has a wing loading of 6.39 ounces per square foot while the regular sized Turbo Timber has a wing loading of 15.4. Anybody who has flown both knows that the smaller one doesn’t feel twice as floaty as the big one in the air.
Thanks for clarifying, Cody!
@@cwojcik_rc thanks, for the unit (the rest is just copy paste from the video)
wing loading + span could give the same information
also funny that it's called "cube" when there is no ^3 to be found
@@cwojcik_rc Because x^1.5 is the same as (x^(1/2))^3 and x^(1/2) = sqrt(x) = sqare root of x, ounces per square foot^1.5 are the same as ounces per CUBIC foot. There's the cube !!!
Silly annoying music. I stopped watched at 1 minute in. Pity! It is a good subject and is likely to be a very good video otherwise. Why?
I suspect it's there to filter out whiners like you, but you still stuck around to bitch. Don't let the door hit you on the way out.
You should not stop watching based on the music. I personally find this video very helpful and informative. I don’t mean to be bossy or force you to watch this video but I strongly recommend watching.
Really interesting, will have to remember this in the future. 🫡