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Old 04-19-2016, 04:55 PM   #131
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Re: JTec Radiowave MX2 2.8m Build log


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Hello Lee, l'm not sure what the projected weight will be but this is a big plane with lots of sq. inches! Modern (ie. light) construction means it should be nice and light on the wing! Maybe Kevin or Al could jump on here and let us know how the prototypes turned out.
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Old 04-19-2016, 04:59 PM   #132
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Re: JTec Radiowave MX2 2.8m Build log

Gordon/Lee

Right around 30 pounds with everything. DA 120 and our canisters. The wingspan is 112 inches.

Al
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Old 04-20-2016, 08:29 AM   #133
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Re: JTec Radiowave MX2 2.8m Build log

Thanks Al!

Worked on one of the wings last night and started with marking out the cut lines for the ailerons. The wing was taped to the shuck and then the ailerons were cut free on the band saw. The edges were trued up with a 24" sanding bar. I marked out servo locations as well as the control horn box before working out the location of the hinges. These measurements will be used for the other wing.

The servo boxes were opened up by first cutting away the balsa skin and then the foam was scooped out with a HD soldering gun fitted with a rectangular wire insert. The servo lead access tunnels were made by heating up the end of a copper pipe and boring the tunnel through the foam all the way to the furthest servo.
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Old 05-03-2016, 12:57 AM   #134
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Re: JTec Radiowave MX2 2.8m Build log

Time to get this plane finished! I was finally able to get out on the weekend and start practicing this year's sequence.... I'm stoked to get this plane done and compare it to my big Dalton.

The servos that I'm using are the new JR NX6421's with helical cut gears, slow start and oodles of torque! They are also about a 1/16" bigger in every dimension from the nice laser cut servo boxes that JTec supplies. A little file work was needed to enlarge the opening and I added a strip of 1/16" ply to raise the area under the mounting lugs.

I inset the servo boxes about a 1/4" below the surface of the wing sheeting and filled up the area around the servo with some balsa. This was then sanded flush with the sheeting.
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Old 05-03-2016, 01:13 AM   #135
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Re: JTec Radiowave MX2 2.8m Build log

The 1/2" x 2" balsa that was supplied for the hinge blocks was of good quality but varied quite a bit in terms of weight. I'm a bit fussy about this and I was a little shocked to discover that if you picked the two heaviest pieces (9.3 ounces) for one wing and the two lightest pieces (5.6 ounces) for the other wing you would have one wing panel weighing 3.7 ounces more than the other By carefully weighing the blanks and putting the right two together, I lucked out and ended up with each pair weighing exactly the same (7.5 ounces). After the blanks are cut to size and the angles planed away, they weigh 3 ounces per pair

The centre line was marked on all of the pieces and then the hinge pin locations were determined. I taped two pieces together and match drilled the hinge holes. The angles were marked on each end of the block and then they were planed down to the lines. The 5th picture shows the jig that I use to hold the blanks while planing the angles. I need to install the control horn blocks into the outer and inner aileron and then I can glue on the hinge blocks.
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Old 05-07-2016, 05:28 PM   #136
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Re: JTec Radiowave MX2 2.8m Build log

Hi Gordon, are the wing blanks cut for the phonetic (sp) tubes? That part still worries me if that has to be lined up and put in by the builder. Also do the wing roots need to be adjusted the fit the fuse? As in lining up the angle of the wing, fore and aft?

I guess the plan for this plane to be capable of both 3D and IMAC since you can put so much throw to the ailerons. Looks like the bevel is 45%.

Thank you for being so detailed in your build! It helps me very much!

My plan is for my next plane to be a build for my DA 150. But I'm finding not to many planes (kits) for that size motor anymore. Most are for 100 to 120cc and 170 to 200cc.

Oops, found that I'm wrong about that. Jtec's 2.7 Extra will be perfect. Oops again, 3.1
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Old 05-11-2016, 12:15 AM   #137
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Re: JTec Radiowave MX2 2.8m Build log

Hi Rick, the foam cores are already cut for the wing spar phonelic tubes. The root of the wing cores almost perfectly match the angle of the fuselage. Only the tiniest amount of sanding was needed to tighten up the fit. I built in a huge amount (for me) of aileron/rudder and elevator throw only for future resale purposes! LOL I will set the plane up for IMAC precision only but any future purchaser will be able to set it up for full 3D throws as well .

I don't think that there is much difference between the 150cc and the 170cc class of motors. A good DA150 has plenty of power for just about any 40% airframe especially when you consider that you can build it lighter as compared to a quad powered airframe. I wouldn't hesitate to power the 3.1 metre MX2 with a DA150.
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Old 05-11-2016, 12:43 PM   #138
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Re: JTec Radiowave MX2 2.8m Build log

Thank you Gordon.
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Old 05-17-2016, 04:28 PM   #139
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Re: JTec Radiowave MX2 2.8m Build log

Gordon-Rick,

Sorry I haven't been by lately. Got sick and ended up in the hospital for a few days and then to NALL

To answer the power question, Any of the 3.1 airframes will work fine with a 150. The original MX2 flew with a 150.

Al
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Old 05-17-2016, 06:27 PM   #140
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Re: JTec Radiowave MX2 2.8m Build log

Quote:
Originally Posted by jtec/radiowave View Post
Gordon-Rick,

Sorry I haven't been by lately. Got sick and ended up in the hospital for a few days and then to NALL

To answer the power question, Any of the 3.1 airframes will work fine with a 150. The original MX2 flew with a 150.

Al
Thank you Al. I am quite sure my first large kit will be a J-Tec. (Thanks to Gordon's step by step details!) Possibly in the fall, and will have find the best way of getting it to Ontario.

But I have to say skinning the wings, cutting out the ailerons scare the begeez's out of me!! I am sure it will go fine but.... Just have to do the first one.

And I do love to build!

Rick
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