JTec Radiowave MX2 2.8m Build log - Page 4 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-14-2016, 01:34 AM   #31
Trumpetman
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Re: JTec Radiowave MX2 2.8m Build log


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I slipped the wing and stab tubes and sleeves into the fuselage and was very happy to see that they are perfectly parallel. Measuring up from the table to the bottom edge of the tubes also confirmed that the stab tube and the wing tube are right on. No twist in the fuselage. Even without the fuselage bottom stringers, it feels really stiff. Once the stringers go in and the whole thing gets covered it will be solid as a rock.

The last step for tonight was to add in the radio tray (fuselage floor? not sure what to call them). These were a little tricky to get in after the fuselage sides were in place. I didn't see any mention of them in the manual
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Old 02-15-2016, 08:40 AM   #32
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Re: JTec Radiowave MX2 2.8m Build log

Gordon,

Very nice build. it looks great. Keep us post on the steps you think we need to add to the manual

Al
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Old 02-16-2016, 03:13 AM   #33
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Re: JTec Radiowave MX2 2.8m Build log

I don't want to install the fuselage bottom stringers until I get the canister mufflers installed and I need to get some 90mm drop headers first, so the fuselage was put aside to start working on sheeting the rudder/fin and horizontal stab.

I mark the ends of the foam cores so there is no confusion which set of shucks they go into. The ends of the cores are cut pretty close to the right angle but as the manual explains, you still have to do the final trimming. A few swipes with the sanding bar were needed to get a perfect fit.

I made up the sheeting for the Rudder/fin and the Horizontal stab. After trimming the edges I tape the sheets together. Using the edge of the table, the glue joint is opened up, glue applied and then the excess glue is scraped off using an old credit card. The joint is taped and then the sheet covered with wax paper and weighted down for the night. Tomorrow I'll pull the tape and sand the sheets.

The phonelic tube (sleeve) was cut into the required three pieces and the fit of the false rib was checked. A section of tube was glued into the fuse and the remaining tubes, along with the false rib, will get glued into the foam core at the same time the balsa sheeting goes on.
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Last edited by Trumpetman; 02-17-2016 at 11:53 AM.
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Old 02-17-2016, 02:50 AM   #34
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Re: JTec Radiowave MX2 2.8m Build log

Although the quality (weight) of the balsa sheeting supplied was very good. I noticed yesterday while taping the sheets together that there was some significant differences in the thickness of some sheets. All of the sheets were marked as 1/16" from Sig but some of the sheets are pretty close to 3/32" thick. In order to sand down the thick sheets without digging into the thin (1/16") sheets I laid strips of masking tape down along the thin sheets and then sanded down to the masking tape. Used 80 grit on a 2 foot sanding bar and then removed the tape and finished the job with some 220 grit.

I used Gorilla glue spread thinly (using an old Tim's card ) and then sprayed a mist of water on the glue to activate it. Everything went into the shucks with about 300 pounds of sandbags and tomorrow I'll trim the excess and add the edging.
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Old 02-18-2016, 03:04 AM   #35
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Re: JTec Radiowave MX2 2.8m Build log

I trimmed the excess balsa sheeting from the rudder/fin and glued on the 1/2" balsa leading edge along with a balsa top cap. The rudder trailing edge is 3/32" by 1/4" spruce to help minimize hanger rash dents. The red line shows the curve that will be carved/sanded to give it that distinctive MX2 look.

I haven't decided yet if I'm going to build in the rudder counterbalance or if I'll have a straight rudder leading edge (like my Dalton).
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Old 02-19-2016, 02:45 AM   #36
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Re: JTec Radiowave MX2 2.8m Build log

After talking to Kevin at JTec, I've decided to build this one with counterbalances. After marking out the cut lines I use the shuck to hold the fin/rudder and cut out the parts on the bandsaw.

The leading edge of the rudder and the trailing edge of the fin are cut from 1/2" balsa. I like to match drill the hinge holes before shaping the angles with a small plane.

Before gluing on the leading and trailing edge I cut a slot in the rudder for the box that will hold the rudder control horns which I'll cut from some G-10.
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Old 02-19-2016, 08:32 AM   #37
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Re: JTec Radiowave MX2 2.8m Build log

Gordon,

Nicely done. It will look much better with the counter balance. LOL What are you using for your rudder horn. Very interested in your setup for it and how you are doing it.

Al
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Old 02-19-2016, 10:45 AM   #38
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Re: JTec Radiowave MX2 2.8m Build log

Hi Al, I cut the control horns from 1/16" G-10. I'll do that tonight but I'm trying to decide on whether one servo (500+ oz in) will do for the rudder? I'm a little concerned about cg if I put two rudder servos back there (especially with the RE2 tuned pipes).
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Old 02-19-2016, 11:00 AM   #39
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Re: JTec Radiowave MX2 2.8m Build log

Quote:
Originally Posted by Trumpetman View Post
Hi Al, I cut the control horns from 1/16" G-10. I'll do that tonight but I'm trying to decide on whether one servo (500+ oz in) will do for the rudder? I'm a little concerned about cg if I put two rudder servos back there (especially with the RE2 tuned pipes).
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
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Old 02-19-2016, 11:02 AM   #40
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Re: JTec Radiowave MX2 2.8m Build log

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.
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