DR-107 One Design R/C plan build, Update #1

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This is a series on building the DR-107 One Design (IMAC) r/c aircraft from the Matt Mrdeza plan. This plan was downloaded from outerzone.co.uk.
In this update, we get started with the wing build by modifying some of the wing rib details. The rib templates are cut from a second set of plans and added to balsa stock. Holes for the wing building jig are added.
At the end of the video, a few thoughts are discussed about converting the original one-piece wing design into a three-piece design.
00:00 Intro
12:13 Thoughts on converting to 3-piece wing

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Опубликовано:

5 июл 2024

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Комментарии : 8

@tasesq 4 месяца назад

Thank you for your thoughts on the tube. I’m really surprised that the holes for the wing jig don’t align the top of the wing so the top is flat when you build it. Your photo of the ribs stacked on the cf tubes threw me a bit. If built on the jig using the drawn holes, the top and bottom skins taper - when joined the wing is then set top down flat on the bench, making all the ribs not vertical? This would make it hard to install the tube as it’s not right angles with the ribs? I wonder why the jig alignment holes aren’t just a fixed distance from the top of each rib? Then the wing would build in the jig flat on the top. The cf tube could be added by enlarging the jig holes. The way it is designed to be built means when you join the wing the r1 ribs would join at an angle right? (With a gap on the underside). Is this the “wood filler wedge” mentioned in the instructions? If I split the wing, then the r2 rib would also not be parallel to the fuselage side etc. Maybe it doesn’t need to be? On the real one design there is a large fillet at the wing intersection with the fuse - in fact it flies horribly without it. G stalls badly. So I was thinking of making up a rib between r2 and r3 which would be where the wing split and double this rib up. Build the wing from r2 outboard, sheeted etc and wing tube holes drilled. Then slice it apart between the two doubled up ribs. The little stubby part remains on the fuse up against the fuse doubler and supports the fillet. Of course doing it this way means I have to make he cockpit removable to get to the servos. So maybe sticking to the plans is easier! Anyway looking forward to see you build it.

@BalsaAeroProjects 4 месяца назад

My thoughts on the three-piece design were meant to be an overview with the details being fleshed out by the modeler. You are correct in that when the wing halves are joined the ribs are not vertical but at a slight incline. I don't know if the difference would be enough to present a problem with a wing tube. It was not a problem with the TF Cessna 182. There would most likely need to be additional ribs added for the join between wing half and fuselage because there would be an angular difference from vertical between wing and fuselage accounting for dihedral. I would offer up the wing halves to the fuselage prior to sheeting to get that alignment correct and get the ribs glued to the spar with shear webbing added. It will take some testing and fitting to get right. Your thought on using the fillet sounds good to me. If the wings are built as per plan with the wing halves being joined, then yes there will be a small gap at the bottom of the center of the wing between the two R1 ribs. The article mentions filling in with balsa or simiilar. I am not building two wing halves to be joined but instead I'm building one continuous wing from the start. That will be presented in the next video. This model will be electric powered so I will most likely make a removable cockpit for battery access. I will try to find a scale panel line or similar on the 1:1 to make the separation. That will be farther down the road. You are definitely thinking along the right lines with making this design change. If you put it into practice, I hope that you will post somewhere. I would like the see your changes.

@tasesq 4 месяца назад

@@BalsaAeroProjects thanks for your reply. If you want any photos of a real one design let me know. We own one which I will be basing my build on.

@BalsaAeroProjects 4 месяца назад

Wow, how cool is that! Must be a blast to fly! I would take any photos that you are willing to share. Even though this build won't be truly scale I do want to do it justice.

@tasesq 3 месяца назад

@@BalsaAeroProjectslet me know how to contact you and I can send you a link to a Google photos album with photos of our aircraft.

@BalsaAeroProjects 3 месяца назад

Could you just provide the link in the comments here? It doesn't have to work as a hyperlink.