RC India

Started the new year with a beautiful new SPAD; Correx Mig 7. Building using plan by Dave West (http://westaero.wingedshadow.com/#MiG-7 Plans) :hatsoff:.
Got the plan printed on A0 paper. Formers made out of two 3mm coro glued together with flutes perpendicular. Glue the sheets together before cutting the formers to reduce work and cutting error.
Former glued using rubber glue. Fuse cut out of 2.5mm coro and glued using hot glue.
Battery bay is my idea  :P

Ugly spar cut out of 3mm plywood with dihedral brace on both side.

Wing + spar. Airfoil turned out little edgy but still flight worthy.

Fuse sitting on the wing to end the day. Already looking like a real Mig :)

Really a great build  :hatsoff: and MiG-3u is one of my favorite fighter!
which power plant you are planning ? Electric or IC engine?
What is the size of the plane
 

Thanks Praveen!! This will be powered by a 3536 1100kv motor and a 11x5 prop.
The pane looks huge with wing span of 1600mm and length 1000mm. Trying to keep it under 1.2kg otherwise i'll have to buy new motor for it :-\

Good build Amit, few issues with mig 7 you must know
1. She will be laterally sluggish , may require a shade extra Throw,
2. You will not see the stall coming, she will stall very abruptly, so for the maiden come down with a shade extra speed,
3. Low speed flying will be fun
4. At slightly high alpha she will wallow in roll plane
5. You may require aileron rudder mix for turns for a clean turn.

Let me know the flight report, looking forward to the video

nice build!!!! lots of efforts!!!! :hatsoff:

i was there at banner field on Saturday, meet praddy, mohan and others......i think u werent there!!!

Thanks Augustinev!
I thought so hence increased rudder by around 30%, will mix with ailerons :thumbsup:

That's my biggest worry, add to that a kinked airfoil :(

@ashJR7202 Thanks and welcome to the club :) Yes I heard you were there, looking forward to see you next weekend :thumbsup:

1600 mm wing span ! thats a huge plane master  :salute:

As gutsy sir stated it will have poor lateral stab and more prone to tip stalls,so should maintain good speed for landing and sharp turns! even a bit CG variation plane will dance in the air!
my suggestion better to have some  higher kv motor like 1400kv ! will have enough power to pull out from low altitude deep stalls!
because i have faced these problem with lower kv rpm with P-51 elelctric, than i have replaced with 1450kv now it flies like a real one!

All the best for maiden master and waiting for video! :thumbsup:

Don't have a better motor right now :( will try with higher pitch prop, maybe a 10x6. hope it works; if not then i'll get a 1400kv motor.

Amit

Laterally sluggish means very stable laterally , Fin height had been a issue with the MiG that's why lateral oscillation at high alpha, good low speed (Without manoeuvring too much). motor should not be an issue, if you pick some speed and climb at a shallow angle of climb

Electronics installed, 1mm rudder and elevator  push rods run through flutes. Plywood motor mount.
Canopy out of 2 liter soft drink bottle.

in pictures:
1. big fat test pilot  ;D
2. Mig ready for maiden

Maiden flight video  :thumbsup:
http://www.youtube.com/watch?v=ASku7c1KKvc

great build sir.........
 :bow: :bow:
regards..
hitesh

hey, thats a great plane...
and the flight was superb..!!!

Thank you Hitesh :)
Thanks Tushar, its a beautiful flyer indeed :thumbsup:

:goodjob:

While bending the fuselage, you have to cut the inner surface flute one by one as described in Spad to the boon site and after fixing, just have to glue again with thin epoxy layer so that smooth curves can be achieved with toughened surfaces. A simple picture just added for others drawn in MSPaint and hope it will explain more.

Nice plane and Nice flying..!  {:)}

Amit
Like someone said what a beauty, did you see the low speed glide, she will be fun there too, also must've noticed how the right wing fell, she is stalling at about 11 alpha, but will recover instantaneously, the moment you lower the nose.

Superb

Thanks a lot guys :)
@Kalyan that's exactly how i did it, a little more patience would have resulted in a smoother curve on the fuselage.
@Augustinev yes she glides a slow speed although the glide ratio is very low. Overall she is more fun at slow speeds :thumbsup:

fantastic plane ....  :hatsoff: .. Maybe you could add a landing gear.. Since it flies in so slow a thin 2 mm steel wire might suffice, no?

Thank you Koushik, i have no plans of putting on a landing gear. The field we fly on is not suitable for rolling take off and has enough grass for a belly landing. Also this bird is way to heavy for 2mm :)

Your test pilot looks like Mr Pugachev after a Cobra. Cute

 ;D had to look up the name on google to get the joke :)
That's my seven months old daughter :D

haha
here is it is

http://en.wikipedia.org/wiki/Pugachev's_Cobra

I gave away my Mig to Rajeev in exchange of build material so i guess its time to build a new one now :thumbsup:
This time I'm building the mig with 1300mm wing span and AUW under 1000gr. Formers are made from sign board material. Just glued the printed plan on the board and cut using hot blade. Holes in first three formers have been inverted for battery tray.

great job..Sun.. {:)} {:)} {:)} :hatsoff:

Some progress :P
The first mig was very heavy and most of the weight was because of the plywood spar. So this time i'm keeping the spar as light as possible. The spar now is made up of 5mmx1000mm carbon fiber tube sandwiched between coro with flutes perpendicular to each other. To make a dihedral; i'm using a small piece of aluminium tube bend to desired angle as sleeve over the carbon fiber tube. Basically, just pushed the CF tube through the aluminium tube. I've used this technique before and it always works great. The CF spar was glued on the wing first and then the coro spars.

The new mig taking shape.. :)

you loves MIG very much.. nice progress.. :thumbsup:

Thanks Roopesh  :)
Yes I love Mig 3 (Mig 7 is a variant) .. they look so beautiful and fly like a dream :thumbsup:

its such a fine design , just perfection everywhere , cant wait to see it done and fly :)

Check out the video on first page :thumbsup:
this is the second mig i'm building  ;D

"oye hoye , bhai ji , zaabardast "  :salute:

 just great , to see it go up in the air , such a pleasent site really , i just so wanna fly that mig  :)

Hey, awesome build..!!!! This one is going to be a great flyer as your previous mig.. Supreb..!!!!  :salute:

Thanks Tushar, maiden next weekend :thumbsup:
In pictures; motor mount installed.

@SLS, excellent build log. She is indeed a beauty

Pankaj

Thank you Pankaj  :)
 
Guys, here is a resource with lots of pictures and info of the MiG-3 family  :hatsoff:
 http://mig3.sovietwarplanes.com/mig3/mig3.html

Tip to make a rigid horizontal stab.

Using fiber tape in the tail section instead of hot glue this time. Also no rudder this time. Looking good now :)

Excellent tutorial! You are tempting me............. (:|~

Thank you VC :) Try it.. its a very easy and rewarding build.

hey one more!!! great!!!! so are u going to maiden this over the weekend!!!!

Yep!! Maiden next weekend, most probably on sunday, have put my glider to rest for a while.

Great build.. and a million thanks for the link to MIG family..  :thumbsup:

Yes there is so much information about mig there, that to properly organised; can keep you occupied for hours  :)

great link..Sun.. still tied in it.. bookmarked.. lots to read with rarest photographs.. a million thanks. and have some nice flights..  :hatsoff:

The second mig complete. Finally decided to add a rudder also. Rudder and elevator servo in tailsection this time to add some weight in the tail. AUW 940 grams with 3s 2200 mah. Power setup, 3530 1100kv running 10x5 APC prop, 40A ESC.

Flew the mig today, flew just as beautifully as the previous but much faster and docile. Will post a video after doing the color scheme.

Some more beauty shots :)

wow..wow.. great Sun..  :hatsoff: :hatsoff: :hatsoff:

Hi SLS

That MIG is soooo beautiful. How did you make the canopy from ? Please use only marking and insignia on her...she looks so pristine in white.

Thanks Roopesh :)

Thank you ankurkaul17, I know she looks good in white but with all white its very easy to loose orientation. Check the attached picture of the plane hanging on a wall of almost same color as the sky we get here. Have not decided on the color scheme yet, will update here.
The canopy is made from a discarded trex canopy from a fellow flyer but a better canopy can be made from 1 litre mirinda bottle.

Sun..its so amazing to see the craft.. nice effort.. :salute: :salute: :salute:

Beautiful! Are you planning on a civilian paint scheme or will you stick to a camo?

Thank you VC!
I'm thinking reno racer style colors, something in read and white or black and yellow.

hey do you have plans for the this mig 7 plane??

hERE I found d files

Why are these files called "d" files ?  They are plain PDFs, the widely used format.

Also, if you found them on another website, please post the source.  We cannot host files without attributing source.

sorry Sir, I dint know d rules. I just posted so dat others cud download.

Oh, that's OK, please do edit your above post and add the full url of the thread from which you got the PDFs :)

And while you are at it, please also note guideline #7 here : http://www.rcindia.org/rc-india-forum/forum-usage-tips/

http://westaero.wingedshadow.com/#MiG-7%20Plans

All OK now sir? Sorry 4 d mistake earlirer

Seems like you still have not read guideline 7 here http://www.rcindia.org/rc-india-forum/forum-usage-tips/  :)

Please note that we have to treat forums like this more like online versions of newspapers... would you like to see a newspaper site content in SMS lingo ?  While it is convenient to the poster to use SMS language, it is terribly inconvenient to the readers.

The link to plans have already been posted in the first post of this thread. The whole world is using plans from there so I dont think its required/wise to post the files here unless you have modified it in some way :)

BTW planning to add some wheels to the MiG :thumbsup:

nice.. with weels it will really be able to land la a proper old warbird!! :)  it seriously looked awesome while flying.. it was great to see it in person..:)

can this be made with 3mm coro only? i cant find any 2.5 or 4 mm coro anywhere.

someone pls reply. can i make mig 7 using only 3mm coro?

Please wait at least one day before posting followup to your own posts.

Yes you can build it with 3mm coro; but you have to work hard to keep the weight down.
Make spar out CF and coro like i did in my second build.
Make former out of two sheets of coro glued together with flutes perpendicular. like i did in my first build (check out first page of the thread)
Do not use hotglue any where, for gluing former's use CA sprinkled with salt.
Firewall you can make out of 3mm plywood.

ps: please note that this plane will require intermediate level of skills to build and fly. this should not be you first plane for either building or flying.

thanks sir.

Installed landing gear to the mig, no tail wheel yet but still steers like a dream. Also added a spinner, glides have improved considerably. Had lots of fun today, rolling take offs are easy peasy. It just runs over the roughest terrain like a boss 8)

Mig 7 squadron flying at Ramtekdi, Pune.

regds

wow its a beautiful plane there u have got there