JTec Radiowave MX2 2.8m Build log - Page 5 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-19-2016, 10:09 AM   #41
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Re: JTec Radiowave MX2 2.8m Build log


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Originally Posted by Kevin Y View Post
Also, even I can't believe how fast you are moving along. The plane is looking great so far and I see why a lot of guys are following your building because you do a great job.
Hey Kevin,
And now you know why I am in good hands with Gordon being a mentor to me

I hope to get caught up to Gordon (as of his progress today ) over the weekend. Letting him stay a few steps ahead of me was my plan all along...

I must say this has been an easier build than I anticipated, bigger is better for sure!!!!

Alan
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Old 02-19-2016, 12:15 PM   #42
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Re: JTec Radiowave MX2 2.8m Build log

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Originally Posted by Kevin Y View Post
So far everyone I can think of is just using 1 servo in the tail for the rudder. If you want to you could always put some lightning holes in the rudder and the elevators. You will not remove a lot of weight that way but with a 4:1 nose weight to tail weight ratio every bit can count. I did it on my extra and did 3 circles on the rudder. The other thing is I just looked up engine weights and the EME 120 is just a couple of ounces heavier then the DA-120 so that will make a difference as well. No matter what you should be able to get the plane to balance fine without having to add weight, it will really just be a matter of where you place batteries and such.

Oh, and you can totally tell everyone the truth I threatened you if you didn't put counterbalances on your rudder.

Kevin
Quote:
Originally Posted by Kevin Y View Post
Also, even I can't believe how fast you are moving along. The plane is looking great so far and I see why a lot of guys are following your building because you do a great job.
Thanks Kevin, single rudder servo it is then! I think I will lighten the rudder and elevators - might as well since it is easy to do at this point. BTW, to anyone considering building this plane (or any JTec offering), you will get very quick and complete builder support by phone or e-mail for anything that is not clear. They are also passionate about counterbalances
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Old 02-19-2016, 11:03 PM   #43
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Re: JTec Radiowave MX2 2.8m Build log

The beveled leading edge of the rudder was glued on using the centre marks. The Fin/Rudder is basically finished other than cutting some lightening holes and final sanding of the rudder. The rudder horns are cut out of 1/16" G-10 and match drilled for a 4-40 bolt. They will be epoxied in after the plane is covered.
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Old 02-20-2016, 04:45 PM   #44
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Re: JTec Radiowave MX2 2.8m Build log

Starting on the horizontal stabs. Before gluing in the phonelic tube and false rib, I used a servo box to determine where the servo lead tunnel needs to exit. I drilled a 5/8" hole in the root rib and set up a little jig to guide the heated copper tube straight into the servo box opening in the foam core.

In order to help get the Gorilla glue all the way around the phonelic tube I used a soldering iron to make some holes which are used to insert the Gorilla glue while constantly rotating the phonelic tube as it goes in. You want a complete coverage of the tube. The tube also has to make a solid connection with the false rib (that also gets glued in with a healthy amount of Gorilla glue). Wax paper is placed on under and over the glue channel and the cores are placed back into the shucks with some weights. You have to watch out for the excess foam coming out of the end of the glue channel and fouling the phonelic tube.

While everything was setting up I used the time to assemble the servo boxes. You gotta love laser cut technology LOL.
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Old 02-20-2016, 11:03 PM   #45
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Re: JTec Radiowave MX2 2.8m Build log

I just noticed that the root rib in pictures 1, 2 and 4 is positioned upside down for the photos. They will be glued onto the cores in the right position when the time comes.
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Old 02-24-2016, 02:13 AM   #46
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Re: JTec Radiowave MX2 2.8m Build log

As per the instructions, the sheeting was glued onto the horizontal stabs. After the Gorilla glue had set, I removed them from the shucks and was getting ready to go to the next step, which is to trim the excess balsa to the edges of the foam core. I decided to take a closer look at the root rib and realized that it was designed to fit between the balsa sheeting. If I had trimmed the balsa flush to the core I would have had a 1/16" step down to the outer edge of the root rib. Hopefully the pictures make sense of is.

I was able to clear away the glue squeeze out and fit the root rib into position and glue it in place. The root rib should have been glued onto the foam core BEFORE the sheeting goes on. This is a little mistake in the manual. I know Kevin and Al are checking in and I'm sure they will revise the instructions.

The leading edge (1/2" balsa) and the trailing edge (1/8" hard balsa) were glued on using masking tape to hold everything in place while the glue set.

Also, you need to take the measurements for the location of the servo bay opening before sheeting as the supplied drawing does not give them. The opening is cut out after sheeting and luckily, my buddy (who is building the same plane), is a couple of steps behind me and was able to give me the measurements since he had not sheeted the core yet. The servo boxes were glued into the opening, the leading and trailing edges were planed down to the rough shape and the balsa tip piece was glued on. I won't cut out and finish the elevators until after the incidence is set.
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Old 02-24-2016, 09:42 AM   #47
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Re: JTec Radiowave MX2 2.8m Build log

And I am kind of glad I am a couple steps behind...
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Old 02-25-2016, 02:24 AM   #48
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Re: JTec Radiowave MX2 2.8m Build log

Time to start on the wings! The first step is to prepare the 1/16" balsa skins. They are edge glued from 6" by 48" sheets. I've learned over the years that balsa which looks the same, can still have vastly different weight. Two of the supplied sheets weighed 45 and 47 grams respectively. Most of the rest weighed around 30 to 32 grams and a couple of the sheets were only 23 grams. If you were unlucky and placed both of the heavy sheets on one wing and both of the light sheets on the other wing you would have a 46 gram difference in wing weights I don't like having to add weight to a light wing so I take the time to weigh each sheet on a postal scale and then sort the sheets to the right or left side wing panel. After sorting and cutting the sheets to the cutting pattern I ended up with the right wing balsa weighing 409 grams and the left wing at 408 grams

The long edges are trued up with a long straight edge and then they are taped and glued using LePage Express wood glue. Now that the wood is sorted I should be able to glue up the remaining three sheets tomorrow night.
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Old 02-28-2016, 06:42 PM   #49
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Re: JTec Radiowave MX2 2.8m Build log

The wing skins are glued up but I'm waiting for some info from the JTec guys before skinning the wing cores. The exhaust headers arrived from Thunderbolt (thanks!!) and I decided to work on the exhaust mounting for the RE2 tuned pipes.

I made my own mounts from 1/8" liteply and some blue silicone fuel tubing. The mount is about at the half way point of the pipe. I believe that one mount like this is sufficient but I'm willing to listen to your opinions...

The formers are pretty fragile until you install the stringers and my ham hands knocked one off, so some 1/8" lite ply came to the rescue in the form of a small doubler

I noticed in a build thread by one of the designers of this plane (the 3.1m version) that he added a cross piece of plywood under the landing gear. The lack of this piece was bothering me so I decided to fabricate and add it as well. I think it will just help to tie the two sides of the motor box together and absorb the shock of a bad landing (I know, I know.... learn to land ).

The landing gear has been drilled for the 8-32 bolts and the maple rails will be drilled and tapped next (not pictured).
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Last edited by Trumpetman; 02-28-2016 at 06:53 PM.
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Old 02-29-2016, 01:52 AM   #50
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Re: JTec Radiowave MX2 2.8m Build log

Drilled and tapped the maple rails and test mounted the landing gear. There are no blind nuts used with this approach (copied from Carden). The idea is that if you really screw up a landing, the wood threads will strip and let the gear break away without ripping up the whole bottom of the motor box. If you do have this kind of an accident, you simply drill and tap for the next larger bolt size.

Started putting the stringers in place...
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