Hello guys.
This is kaushik
I want to know how to scale rc planes
Let's take
Tejas Mk2
Length 15m
Wingspan  8m
How to choose correct scale for this

Hey Buddy,

'Scaling' is a very loose term.
Do you have pre existing plans of the Tejas which you want to rescale?
Your Question can also imply scaling down the actual aircraft dimensions. In which case, you just divide by the scale factor.
For example, I have a WDM 3D locomotive with a length of 17350mm and width of 2950 mm. If I had to scale it down to 1:43, i would just divide both the dimensions by 43.

Try being a little more specific, please?

Tailwinds,
Prabal

I generally increase the wing area to reduce the wing loading and the wing cubic loading

Have a look at the attached threads where a plan of the real plane was modified for RC.. (the RC planes flew well).. You could use a similar approach

Su 35   https://www.blogger.com/blog/post/edit/5595537395549993358/5419552936269672167   

F 18           https://www.blogger.com/blog/post/edit/5595537395549993358/7265640752231725541 

Regards
Rahul

The blogger links are meant for you only..... its in edit mode. For us ...we need view links. Else its not opening.

Depends on
1. What your objective is
2. What power
3. What size
3. Estimated wing area, estimated weight, estimated wing loading
4. Power source, glow electric, rubber etc
5. Prop, ducted fan of jet turbine

And so on...

You have to tell us what you’re thinking of, to get useful replies.

Edit:
I presume you mean a flying model, not a static display model.
If so, do you have any experience of building/flying an RC delta/canard?

I suggest you start with a 1/40 scale (20cm or 8” span) model using 1/16” balsa for the flying surfaces, and 1/8” for a profile fuselage, to determine the CG position and incidence of the canard.

Best of luck.

Edit:
Hope you noticed that it is designed for instability 

Sorry about the wrong links in the earlier post

hope these work

Su35:  https://myrahulroy.blogspot.com/2017/01/su-35-with-thrust-vectoring.html

F18:   https://myrahulroy.blogspot.com/2018/01/rc-f-18.html

Regards
Rahul