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Old Oct 06, 2013, 04:33 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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Build Log
1/7 Aermacchi M-346 / Yak-130 / T-100 2x90mm Composite Scratch Build

This will be the build log of the Aermacchi M-346 (sharing an airframe with the Yak-130). It will be scratch built and molds will be created for potentially selling kits to build this plane. The plan is to have a 13-15lb plane that will be powered by one of three options: (1) 2x90mm EDF, (2) 1x120mm EDF, or (3) 60N-100N turbine.
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Old Oct 06, 2013, 04:41 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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The Plane

From Wikipedia:
In 1993, Aermacchi signed an agreement to partner with Yakovlev on the new trainer the firm had been developing since 1991 for the Russian Air Force. The resulting aircraft first flew in 1996 and was brought to Italy the following year to replace the aging MB-339. At the time, the aircraft was marketed as the Yak/AEM-130, however, by 2000, differences in priorities between the two firms brought about an end to the partnership, with each developing the aircraft independently, with Aermacchi retaining worldwide marketing rights except for Russia and the other CIS nations. A Russian version is also being pursued by Yakovlev and Sokol, under a different time schedule.

The M-346 is a highly modified version of the aircraft the joint venture was producing, and uses equipment exclusively from Western manufacturers. The first prototype rolled out on 7 June 2003 and flew for the first time on 15 July 2004.
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Old Oct 06, 2013, 04:43 PM
Do it Right, the first time!
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
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Alenia Aermacchi M-346 Master (5 min 21 sec)


That should give a length of 64.63" and a WS of 54.69" @ 1/7th scale.
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Old Oct 06, 2013, 05:02 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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The Plans

First of all, we checked what's available.

Jet Legend has a 1/4 scale of the Yak-130 (http://www.jetlegend.com/index.php?Page=112). Weight is 22kg and requires a single 200N turbine (or two 100-120N). Price tag (ARF) is $2,999.

C&C (Italy) offers a 1/5 scale (through Global Jet Club) as the M-346 (http://www.globaljetclub.com/index.p...roduct_id=2112). ARF price is $2,450. Requires one 120-160N turbine.

Both are beautiful, but we wanted something smaller.

Then there is this: http://www.rcgroups.com/forums/showthread.php?t=1776685. Nakayan developed plans for a scratch built, ply and balsa, twin 70mm plane. He was generous enough to post his plans. However, those are specifically customized for full wood construction.

So, we were looking for a 3D CAD model of this plane. And we found one at www.flatpyramid.com. For $100 we now own a great model. The model was design by Stefano Tartarotti in 2010-2011. We do realize that we still need to choose airfoils, as the model lacks in that area...
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Old Oct 06, 2013, 05:03 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
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Quote:
Originally Posted by CoolerByTheLake View Post

That should give a length of 64.63" and a WS of 54.69" @ 1/7th scale.
You did the math too?... Yes. I expect it to weight 13-15lb AUW.
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Old Oct 06, 2013, 05:04 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
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I plan on the first prototype flying 2x JetFan90 fans, and probably HET 700-75-1250 on 12S.
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Old Oct 06, 2013, 05:06 PM
Do it Right, the first time!
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Is that going to be big enought for twin 90's?
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Old Oct 06, 2013, 05:12 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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The inspiration

We didn't just decide to start this project all of a sudden. Actually, we did, but after we were inspired, and the level of inspiration reached a critical mass that we just had to start something ourselves.

We were inspired by falcom5 and corsair nut with their T-38:
http://www.rcgroups.com/forums/showthread.php?t=1559834

By acesimmer and his 2x90mm Typhoon (good luck on maiden this week!!!):
http://www.rcgroups.com/forums/showthread.php?t=1831924

By invertmast and his 1/7 F-14 (which is much bigger than a 1/7 M-346...):
http://www.rcgroups.com/forums/showthread.php?t=1483635

X30Pilot with his 225lb rocket driven X-2 (which just had a successful maiden!):
http://www.rcgroups.com/forums/showthread.php?t=1607888

A10pilot with his 88" foam-made A-4:
http://www.rcgroups.com/forums/showthread.php?t=1898841

Nakayan and those who followed him in the scratch built M-346:
http://www.rcgroups.com/forums/showthread.php?t=1776685

And many, many of you who built beautiful planes from scratch.
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Old Oct 06, 2013, 05:17 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
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Quote:
Originally Posted by CoolerByTheLake View Post
Is that going to be big enought for twin 90's?
Nakayan (http://www.rcgroups.com/forums/showthread.php?t=1776685) built a smaller one (mine is 124% larger) for twin 70mm and flew it. I'm thinking that 124% larger would allow 87mm. Close enough. This plane has a very wide body, and will accommodate a lot, I think. I will still go over the size more thoroughly once we print the plans and get a better sense. I know that the thrust tube exits seem to be about 80mm, which is perfect for a 90mm fan (JF90 require 78-79mm on the inside, and with a 0.3mm thrust tube material will fit perfectly into an 80mm "hole"...). I still need to see what will the size of the intakes be, and if it has enough surface area for a 90mm fan. Can't be too small (will starve the fan) and can't be too big (will cause drag). We'll see. I also think that it would be generally suitable for either 2x90mm or 1x120mm with the same sizes, as the FSA (depending on motor diameter, of course) will be quite similar.
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Old Oct 06, 2013, 05:21 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
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The Quality

We are very impressed with the quality of some of those scratch built I listed above. Our plan is to build the plug, build the mold, produce the first 2-3 units, and fly them. If flyable, we will likely make it available to others. If ever offered, we plan on being at the Skymaster / Jet Teng quality level.

We will try some very cool features as we go along.

We are starting with building the plug. We will "slice" the 3D CAD plans of the fuselage into 1/2" slices. We will cut them out of blue insulation foam (out of Lowe's). We will then build it up to one unit. Then comes the sanding, filling, sanding, polishing, rivetting, panel lining, etc. until we have a beautiful plug ready for a mold to be created.

Just to make sure we don't "waste" this plug--we will first try our mold creation technique on something simple...
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Old Oct 06, 2013, 05:37 PM
Do it Right, the first time!
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United States, MN, Hermantown
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ysolomon , Having measured my JF90, and it seems depending on V1 or V2 the motor tube differed a touch. I figured my V2 FSA was 7.2 sqin, I think mmy motor tube was 43/44mm, don't recall which.

I do remember the intakes for my Scorpion build needed to be 3.6sqin each for 100% FSA. By the time I have to make the ducting they will be a little bit smaller, which I understand is no big deal.
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Old Oct 06, 2013, 05:53 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
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A little bit shouldn't be a problem. Once I have the printouts at the 1/7 scale, I will check what will the intakes be like. I believe they should be somewhere in the 85%-100% of FSA.

By the way--thanks for being the first reader of this new thread!
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Old Oct 06, 2013, 06:10 PM
Do it Right, the first time!
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United States, MN, Hermantown
Joined Dec 2008
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Being my "building area" shares space with the computer and too many other things, makes it easy to " keep up" with new posts!!


I will need another 90's set-up for my F-86F build, so I'll be watching to see if you go with new Het 1250Kv motor. Just seems prudent to stick with one sized fan, and batteries. Good luck with build, looks to be another great one!!
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Old Oct 06, 2013, 07:31 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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Thank you! Yes, I'm enjoying the JF90 on a fiberglassed HTG L-39 (~10lb), but on 8S and 1680kv. I was looking for a 12S 1250kv option. JF recommended the Leopard 1250kv motor, but I didn't hear great things about it... HET didn't have anything in the 700-83 series, so you would have to go with the 700-68-1200, which would produce less thrust. The only other alternative was a NEU 1518, at $300+. All of a sudden, they came up with the new 700-75-1250. I asked JF about it, and they said that it was designed for them. I'm waiting on a Jet Teng 90mm ViperJet to arrive any day now, which I plan on flying with this power system.

As far as the 346--I expect this to be a looooonnnnngggg build, but I promise to take pictures and write often and a lot.
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Old Oct 06, 2013, 08:46 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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Next step: I downloaded the M-346 model for Microsoft Flight Simulator X (FSX) from here:
http://flyawaysimulation.com/downloa...-m-346-master/

Now I'm flying this plane...
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