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Old May 24, 2013, 11:10 PM
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90mm MiG 21 TURBONUT/SCALECRAFT Group therapy.

Thanks to Scott, we got our hands on a MiG 21. I had blown up 3 views. Fortunately, my 3 views were 52.5" fuse, this one is 54.25" from intake to tail cone. Worth the massive head start on a composite air frame if the fuse is already pretty much made. Just needs corrections and modifications to the MF variant. It will come together much faster than the 104. The MiG is not as complicated and there is a fuse already

Many things will be changed to reflect the MF variant from the P something variant this is.. Although, the P variant will be molded with an option for the MF

The model was originally a prop powered model with a removable wing going right through the middle of the fuse.

The things that will be changed are the wing mount, the wing(too fat), the V stab(too fat)and no top "stinger", the flying H stabs, the H stab farrings, the nose intake section, and various humps and air scoops. All composite of course. And fabricated for 90mm EDF. The idea is not to go too crazy on this, just impressive.

I am also working on laying up another F-104. The MiG is just an early bonus.

Steve
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Last edited by SCALECRAFT; May 24, 2013 at 11:20 PM.
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Old May 25, 2013, 01:37 AM
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upland CA
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That looks much better..need to prime the nose also ..it makes it look too big...the M model look mush more bulky and tuff
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Old May 25, 2013, 02:18 AM
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Sweet ..man i wish i had done a 90mm F-20 ...but then way too many people would want them . 24 molds to make a plane oh well they are getting easier to make ..the more you do the easier it gets
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Old May 25, 2013, 09:16 AM
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Cool. A 90mm Mig ! Are you going to do any rivet detailing for the plug ?
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Old May 25, 2013, 09:44 AM
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Gaithersburg MD, United States
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Awesome subject Steve! Please tell me you will be offering these for those of us who are interested.

Paul
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Old May 25, 2013, 09:55 AM
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Scott, I'll fix the nose shortly.

Probably, but it has to be test flown and discussed with Scott, then we will see how and when it will be offered.

Probably not much on rivets. Similar detailing as our F-104 maybe. We'll see how motivated we get.

Steve
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Old May 25, 2013, 03:04 PM
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Belgium, Walloon Region, Mons
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good news man!
one of my friend is in progress with his with a mig 21 build too !around 1.8m lenght
composite build
should be cool to share some ideas
good luck
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Old May 30, 2013, 02:12 AM
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Absolutly,
I currently work on a 90mm EDF MIG 21 CMT.
The fuse master is 72.83’’ without cone and 75.59 with it.
There is a lot of work before the first flight (which is expected to be in 2014) , however the aerodynamic configuration will be tested this summer (if we really have a summer in northern France (it always rains cats and dogs))
Notice that this will be a scale model too (not a sailplane like the VMAR mig21) with flaps and taillerons.

It’ll be a full composite kit designed for :
- sport jet : with an awful methanol motor in the nose (and without scale cone)
- 90mm EDF
- Possibly 120mm EDF
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Old May 30, 2013, 02:20 AM
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CMT (cyrillic )is similar as SMT (western). So it is a mig21 SMT :-)
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Old May 30, 2013, 08:38 AM
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Quote:
Originally Posted by cedric8074 View Post
CMT (cyrillic )is similar as SMT (western). So it is a mig21 SMT :-)
Nice

What is the fuse diameter at the point were the EDF will be mounted??

I'm thinking 90mm will be too small for such a large reproduction.

Steve
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Old May 30, 2013, 01:30 PM
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Very NICE!! This will be fun to watch!!
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Old May 30, 2013, 02:42 PM
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Quote:
Originally Posted by SCALECRAFT View Post
Nice

What is the fuse diameter at the point were the EDF will be mounted??

I'm thinking 90mm will be too small for such a large reproduction.

Steve
at this point fuse diameter is about 5.1''.

the problem with the mig 21 is is poor flight surface. It's hard to conciliate good fligh characteristics and good performances.
However, if a 90mm has a good performances this will fly.
It'll not be fast as a modern jet (like f16 or mig29) but it'll have a realistic flight (the mig 21 was a 60'th jet like the F4).
So The main problem is to have enough thrust for vertical performances.
I'm optimistic in my pessimistic choices ;-)
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Old May 30, 2013, 03:58 PM
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Belgium, Walloon Region, Mons
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the main problem with this shuttle is the FSA witch is very small without any cheater holes , and this is not an option !
no cheater holes for the scale look
so the 90mm fan is the best compromise for this size
some of motor now can easily produce more than 5000watts on 10/12s even 7000watts for the the biggest ones
so there is no worries to make this sausage fly
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Old May 30, 2013, 04:38 PM
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Quote:
Originally Posted by cedric8074 View Post
at this point fuse diameter is about 5.1''.

the problem with the mig 21 is is poor flight surface. It's hard to conciliate good fligh characteristics and good performances.
However, if a 90mm has a good performances this will fly.
It'll not be fast as a modern jet (like f16 or mig29) but it'll have a realistic flight (the mig 21 was a 60'th jet like the F4).
So The main problem is to have enough thrust for vertical performances.
I'm optimistic in my pessimistic choices ;-)
The 104 is hard, the MiG 21 is almost a flying wing. I'm looking for speed without over amp'ing equipment.

Cheater holes. No. However, we have an idea that may help on the take off.

Steve
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Old May 31, 2013, 01:14 AM
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Yes, i agree with you
The Mig21 has plenty of wing area compared to the F104, but less than a S04050 VAUTOUR II ;-)
The F104 is a very particular and unique plane (such as SO9000 TRIDENT)
It's a real challenge for rc modeller.
yesterday evening i watched some MIG21 on youtube.
There is 2 auxiliary jet intake, opened for take off (small square bellow the cockpit on both side of the fuse).

Your f104 is great, good job.
The MIG 21 master too.
although i have a question about molding : how did you do to reproduce structure line on the master? Which tools have you used?

ced
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