Ask mr chintal of rcmumbai...
he must have these

i have regular talks with him good friend of mine he doesn't have it anyway its already on its way so all i can do is wait and wait...

Where are you going to fly this big boy ?
Even butchery would be small for this

@multiwii lets see sir
atleast let me make it to run first then i will give up a call to my borther-in-law...

Okay

One more Lucknowite on forum..
@multiwiihelpreqd: Welcome...
Where do you live?

@KK Iyer sir i was thinking about reinforcing the wing with cf rod under the wing section so that its all rigid.....
attaching an image of how i was thinking it to be placed.....
i have also conveyed this problem to chris sir(demondriver) and he told me for 4.1lbs(1900g) AUW and 55inches(1390mm) wingspan its all good and recently i have measured it to be 1400g without battery and battery is 500g so i thinking it should fly fine and adding a reforcement could make it more rigid...

Regards
yash

Looks nice.

How are you going to hold the wing and fuselage together ?

@devang i gave glued a piece of balsa dowel at one end and magnets underneath plus also will be using wing screws to hold it firmly...

Nice idea . Hope it works .

love to see lots of wire and joints 

@wingmanbunty i too love the electronics part the most

Have you checked whether two edfs give enough thrust or not?

keeping two dummies reminds me of
http://www.rcindia.org/electric-planes/61-inch-boeing-747-300-electric-ducted-edition-build-log/

@topalle yeah i have checked it before i bought the EDFs its the basic thing for beginning of a project you need to do some math calculations for a working model....

for these model thrust to weight ratio should be 1:1 or 3:4 and each edf will give 0.9-1.1 kg thrust so easily i can achieve 1:1 ratio...

In the link I gave above, the builder had made an underpowered model so it didn't fly ver well...
Good  that you checked...

@yash10896

some more add on power in our hand is batter idea for the success of so much hard work

@wingmanbunty sir i think the edf which i chose should be sufficient if not i will order new one for better performance but now also i believe it can provide enough thrust to make a scale flying possible...

also being a high wing plane it creates more lift and more stable to winds...

@yash10896
Sorry for delay in response. Been busy at work 12 hrs a day, and Gusty Sir was here yesterday!

I fear that an exposed spar like that would be just like a spoiler for reducing the wing lift.
Much better if you can sink it into the wing surface.

Why the sudden need for a spar?
Were you not going to glass the wing?
If you really need wing strengthening, why not a flat strip of carbon fibre on top and bottom, which will hardly protrude above the surface?
If you don't have CF strip, even FG tape may suffice.

Have you tried to check whether the wing is strong enough (in bending) to support at least 2-3 times the all up weight?

I think that he is just using that pic to show us where he wants to put it .

Quote from: devangflyer on July 31, 2014, 10:00:11 PM
I think that he is just using that pic to show us where he wants to put it .

Fine if its inside the wing and in line wth the MAC (as per his hand drawn pic )

   

More importantly, it seems to me that on this forum,
there is too much emphasis on the thrust required, and hardly any on the wing loading.
The full size c-17 has a power loading of only 0.4!

Based on the type of model, and the performance expectation, we need to decide if it is going to fly on the wing or on the power.

You would have realised that i belong to the flying on wing school (old school?)
And that i do like models that have a power loading of zero  

See, the power required depends on
The drag and the desired cruise speed.
Which depends on the stall speed.
Which depends on the wing loading!

Which is why whenever i get a query on the forum, the first thing i ask is what is the AUW, what is the wing area, and so what is the wing loading.

(Sometimes i ask what is the cubic loading, but that is another story...)

Am trying to locate the video of a large thermocole jet that took off in less than two fuselage lengths.
Not vertically on power, but horizontally on the wing. Will post when found.

BTW, if Butchery Ground is too small, you need to build a different model. Or go to Bakshi! (We used to go there too, you know!)

@KK Iyer sir thank you for that reply and i too was against the round cf tube it was just for explanation which i borrowed from bixler wing spar...
i am ordering flat cf rod from RCD and other bunch of stuff..
i am also gonna fiberglass the fuse as well as wing and will be doing that after 14th aug as i will be having 3 consecutive holidays from coaching..
i dont think wings can handle 2-3 times of AUW as its too risky for time being i will test it after fiberglassing and flat cf installation...
and sir i dont think the ground in which i will be testing is small...
my brother-in-law has a different field i think which is not allowed to public he will help me through it or otherwise i will go as u suggest near bakshi ka talab their i also have a farm house near which it has lots of open space so i am not worried about that....
any other thing you think i should add for better flying is always welcome...

one question does it require two layer of 18gm/sq.in fiberglassing or one layer will do.. same applies for fuselage
please try to answer it as i am very new to this thing....

Regards
yash

@yash10896
18gms/sqin?
Must be 18gms/sqm!
My RCTLG balsa wing has only one layer. It is strong enough for high speed catapult launch even without any spar or dihedral braces. Also strong enough to survive hitting an electric pole without even a dent.

Weight addition for about 400sqin was 28gms.
I covered it in 8 separate pieces of 12"x4" each. Larger size may be harder to do.
Initially i needed 5gms of epoxy/hardener mix for each piece, but as i gained experience, i was able to reduce it to 3-4gms.
You will need plastic/thermocole cups and a digital scale to accurately measure such small quantities.

(You still have not told me the expected wing loading  )

I suggest you test the flexibility of the wing after the first layer of fibreglass is cured. If not stiff enough, you can add a second layer to the center one third of the span.

Best of luck. BE CAREFUL ABOUT POISONOUS FUMES.