HOW TO SIZE THE WING and other lifting surfaces
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- Опубликовано: 5 авг 2017
- A step by step method to calculate the wing size (or the total lifting surfaces) for your plane, in order to have a convenient wing load.
You can also check if your plane is a good flyer following the cube wing load criteria 
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I used your video to design a rc plane of c rating with 8 , it flew well . Thanks.
Thank you so much. I have been looking for this for a long long time.
This is very educational video. and follow a good sequence of explanation. Great clarity!
This video is a very good tutorial for beginner. Thanks
Thank you very for such amazing knowledgeable video.🙏🙏
MUCH NEEDED SITE SO GREATFULL TO U . KEEP THIS SITE OPENFOR LONG TIME PLEASE
Great video thank you 🙏🏼
well I thank you very much and will be looking forward to doing my OS2U-3 Kingfisher
thank you for sharing this
Excellant...informative...thankyou
Alot knowledgeable thanks
I’ve made a plane with a C value of about 11 and it flew but it was so hard to control that I crashed it multiple times. I’ve made a new design with a C value of around 6. I’ll reply with my findings on how much easier (if at all) it is to fly
How did it go ? I'm designing a large filming airplane so this type of video helps a lot
nice work. Thank you
Thank you
thanks very much
Thanks for your turorial.....
How To get ws n chord didnt review to complete cause im confused🤔🙄!
its really nice
Your video saved me a lot of time and money. Thank you. I do have a question for you though.
You substitute C with ASE. Nowhere in your presentation can I find what ASE stands for. Can you reveal that, please? Thanks again. JT
As far as I understand, its A^1.5
TQSM
So to calculate the size of the wing you have to know the wings weight before hand?
more like the whole plane weight + some extra as a load factor
you will fly outdoors, not in ideal conditions
Iam having a rectangular cross sectional fuselage.....my question is that...I don't know whether I have to add this fuselage area to the summation of lifting area...pls say about it
If it's a nurmal fuselage I don't think you need to add it. It's when the with of the fuselage makes up more than 1/4 of the wingspan that's needed.
What about the tail design?
it was confusing at first...but I figure it out. Which was helpful. Thanks
Im scratching off a 3D plan. it was right on the money or at 10.
But I dont really need it to fly 3D...it's just for simple build.
Which is a struggle. Then force to use the same size batteries and build like pro...
which isnt going to happen. Im most liky going to over build or be on the heavy size
using foamboard. which will tip me to a flying brick...brick or use a lighter battery
and get 3-4 mins of flight time...(NOT).lol
i was going to clip the wing to plans...
Im not now...the extra inch wing span will cuase more drag but will bring the model
back under 10 ( for the extra wiegth I might incure) Now i can figure out the proper motor and prop combo for the drag and wieght. Torque is what I want...not top speed.
Even if I build lighter...it's not going to drop to under 6.
I'm pressing show less button.
9:39 The governing equation for the table is y = 1.0002 * x ^ 1.5...where y is Area (dm2) and x is AES...
Thank you so much!
Actually shouldn’t it be x^.66 because you have to reverse the aes
And I don’t know why but 1.04 works better then 1.0002
When calculating C why are the metric units square decimeters? And not square centimeters?
@V Chang Thanks for the update!
You determine the area required to carry a certain load but is airfoil efficiency not a factor?
Hi Mel. The required area has to do basically with the wing load, but the airfoil has a lot to do with the type of flight. If you have a trainer or a jet, the airfoil of course is different.
Also, the airfoil has to do with the drag. Thicker the airfoil, grater the drag,
Hi,
How come the wingspan is 16.6 dm in minute 11.34?
Cheers,
Ok. you have area=46 dm2 (eq. 1) and wingspan/chord =6 (eq. 2) . From eq.2 you have chord= wingspan/6 (eq. 3)
Now you put eq. 3 into eq. 1 and the result is wingsapn = SQRT(46 x 6) = 16.6 dm .
Once you have wingspan put it in eq. 2 and you have the chord = 16.6 / 6 = 2.77 dm or 277 mm.
how did you calculate wingspan and chord at 11:49 minute
Many Many Thanks
Hello; what is ASE and how to use it,also how to use power of 1.5
Hello Paul. Sorry for the delay. ASE is the calculation of lifting area to the power 1.5. I made tables of ASE so you do not have to calculate it. It facilitates the other calculations as explained in the presentation.
@13:05 the dimensions of wing expressed in which unit. Mine dimensions are
1) Wing
Root chord-440mm, tip chord- 120mm, wing span (one side)- 427mm.
2) fuselage
a)Central fus- length- 680mm, width- 390mm. b) Forward fus- length- 785mm, width- 390mm.
Plz help me to understand calculation
decimeter that is =10cm. convert according to this.
How does thrust relate to this formula. Say 35g 1.23oz ?
Hi Mel. Sorry, I don't understand the question.
Thanks for asking. Using the formula to determine the surface needed for a load, how does thrust/airfoil/drag factor into something that flies given the determined surface/weight result? It seems to me (aeronautical ignorance here) that to achieve any degree of lift, the wing profile and thrust must factor into actual flight. For example, I have a given load (70g) and a given motor (35g thrust). How is the surface needed to carry 70g related to a design that has 35g thrust? Does surface area change based on thrust?
@@melristau If you my video on How to choose a motor: ruclips.net/video/EL1vt9ufEcE/видео.html There is a table at the beginning that relates the thrust/weight ratio according with different types of airplanes. This table is of common use by aero-modelers.
There I propose a process to select a motor and propeller that has proven to be useful for the hobby.
It took to me a considerable time to understand the relationship between all this variables and to put in few words all the information.
Hope it will be useful for you too.
I am not an aeronautical engineer, but a mechanical engineer trying to put some of what I have learned by experience in the hobby.
Thanks! Did watch. The plane I’m trying to design is based on an RC system with max thrust of only 35g! + a total load of about 70g. The lift area is what I’m experimenting with. 🙈
the weight of the MIG 29 showing at 7.47 mins has typo it should be 1450 g ( current value 1.450 g)
Hello; Your videos are very good,but I still don;t know how to calculate the power of 1.5 with wing loads and weight,,,can you explain how to use it...its me,I have a hard head to learn new things.............
Hello Paul. You don't need to calculate it because is already calculated and tabulated in the presentation.
C= total weight/(Lifting Area)^1.5
to facilitate the calculation I call ASE =(lifting area)^1.5 , so if you have the area , you look in the table and find ASE . Once you have ASE calculate C and see what value you obtain. (less that 12 is OK)
On the other hand, if you can go the other way, if you want a defined value of C (say 9, for example) you can calculate what area do you need in your model.
Once you have the area, you can determine the wing according with the type of selected wing.
The unit dose matter! Otherwise you geht other constans. Realy Bad math but a good rule of thumb
Of course the units matter!. But if you use a consistent set of units, (English or SI) the C value is the same
Someone plz clarify me ..
At 11.48 mins, how did we assume ratio as 6..?? based on what..?? thanks in advance
Hello Ashok. The wingspan /chord ratio of 6 is common for trainers. For gliders this ratio could be as 18. For jets it could be as 2 (delta wing)
@@rcairplanesvictor9866 ...thank you sir ...thank you so much
@@rcairplanesvictor9866 what are the ratios for the rest of the other planes?
If you could get a real voice and maybe use cm³ (I know it's not the standard unit but it's something more commonly understood) Otherwise brilliant info.
The hard part is not knowing the weight of the plane without making it. But I wont be bale to get the scale right without knowing its weight.
how did u manage to get 8.27 from 26??
To better answering you, please mention the time in the video.
@@animatronicmagicmpt7828 13:25
from the expression 26 dm2 = 0.38*WS^2 , now solving for WS^2= 26/0.38 = 68.42 from here ==> sqrt(WS^2)=sqrt(68.42) = 8.27 dm or 827 mm. (Sorry for the notation, it is difficult to write mathematical expression using the standard keyboard)
@@rcairplanesvictor9866 oh ok thanks for replying
DONT LET YOU IMPRESS BY THE MATHEMATIC!!!
thanks for posting. pretty good presentation. here are some things to consider. wing loading NUMBERS are Secondary to the general Management of mass and a model's ALL UP WEIGHT (auw). a horizontal stabilizer (not elevator) of an rc model plane, Should NOT Make LIFT. where auw is Not excessive, achieving optimal wing loading is Simply a matter of adjusting the auw. each component part of an airframe Should Be designed to be Functional and LIGHT. model builders Should learn about the part Distribution of MASS plays in CORRECT airframe design. the Ultimate wing loading of a model is a Consequence of ALL design choices. INCLUDING, choosing to make ALL COMPONENT PARTS AS LIGHT AS PRACTICAL. where MASS is not Optimally 'located' in an airframe, even if the model can be correctly balanced, its Wonky Distribution of MASS, DOES NOT GO AWAY BY ITSELF. at 8:44, 1.54 KILOS. this is so much heavier than A small model should weigh. a meter-span model COULD WEIGH twelve OUNCES, instead of two-plus POUNDS. in nearly all cases, where NON-traditional model building materials are used, a model Will be heavier than it COULD and should be. one solution is to make a Bigger model, which would require the use of a correctly spec'd power system. cheers googletranslate
some resource
www.princeton.edu/~stengel/MAE331Lecture5.pdf
wright.nasa.gov/airplane/shortw.html
s3.amazonaws.com/assets.flitetest.com/article_images/medium/truecg-jpg_1384168691.jpg
illustration, not fully accurate; each design should include the use of a center-section
4.bp.blogspot.com/-2--h6sQm6gM/UbHzoXWPxYI/AAAAAAAAUiI/sn7cWnVlkuQ/s1600/polyhedral.jpg
Meth of engineers
0:56 does it have to be a radio controlled plane? Can it be a real airliner? Thanks a million.
I am not completely sure, but I am almost positive that the wing cube load can be applied to any flying plane.
@@David-yy6hp thanks a lot. I guess this works for a Cessna 172/Piper Cub or something like it.
@@David-yy6hp thx a lot. I do think this works for a Cessna 172 dough.
I have never seen wing cube loading for big aeroplanes.
Why...?
Perhaps because the term is not for real.
Instead use the thin airfoil therory.
The big difference between a full scale an model plane are.
The measurements are scaled down say 1:10.
That means the wing are is reduced by the square if the scale factor.
So the wingloading must come down by 100 in case of a 1:10 model.
Also when we fly slower the lift is reduced by the square of the reduction in speed.
So - calculate the CL (coefficient of lift) of your model by wheight speed and span.
Kepp the CL the same as a the real plane and you’ll be fine.
S
He should have reduced the weight to arrive at the correct scale and CL.
Thank you