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Thanks Alex, your design is perfect. I was just wondering if this was done via software but its a case of using a slightly longer airfoil and then just trimming it, them im good:-)
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Hi Alex,
I want to ask you if you could provide a 3D model of the cab and engine cover in .step format? Thank you. :) |
Originally Posted by dave.k96
(Post 12560429)
Hi Alex,
I want to ask you if you could provide a 3D model of the cab and engine cover in .step format? Thank you. :) I converted the cowl and canopy to .step format, you can find them here: https://drive.google.com/open?id=1nI...62z4iLboSL5-e2 The cowl is approx. 5mm longer than needed in the nose area so it can be either cut straight for the contra unit or with 2-3 degrees right thrust. You can also use different spinner sizes (83-89mm). The cowl and fuselage balsa structure are overlapping on a distance of 15mm. The canopy is approx. 5mm larger where it meets the fuselage to compensate for any errors during the assembly of the fuselage balsa structure. It needs some trimming to fit the fuselage perfectly before the canopy frame is attached. |
In order to have complete building instructions, i will add some CAD images to illustrate what is left to do to finish the airframe.
Today's update shows the motor mount and cowl attachment to the fuselage. Since i didn't get that far with my Vortex build, i highly recommend reading Isaac Najary's Fantasista build thread. There are some similarities for the cowl and motor mount assembly: http://www.rcuniverse.com/forum/12034186-post33.html http://www.rcuniverse.com/forum/12034187-post34.html https://cimg5.ibsrv.net/gimg/www.rcu...8aac9c2f33.jpg https://cimg6.ibsrv.net/gimg/www.rcu...9e5d9cfff9.jpg https://cimg7.ibsrv.net/gimg/www.rcu...784583d446.jpg https://cimg8.ibsrv.net/gimg/www.rcu...88ba084448.jpg https://cimg9.ibsrv.net/gimg/www.rcu...07337ade3a.jpg https://cimg1.ibsrv.net/gimg/www.rcu...bd3e6d68ac.jpg https://cimg0.ibsrv.net/gimg/www.rcu...3bce83e75b.jpg https://cimg2.ibsrv.net/gimg/www.rcu...024877e0cf.jpg |
Thanks Alex, where can we get push-button and latches from?
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Originally Posted by GootyS
(Post 12564982)
Thanks Alex, where can we get push-button and latches from?
https://www.f3aunlimited.com/f3a-unl...h-pair-style-b They have a few different versions, so make sure you get the type B in the link above. Anyway, i found them to be a little heavy so i cut them and made them smaller (and 7g lighter). https://cimg2.ibsrv.net/gimg/www.rcu...e8e9f50722.jpg https://cimg3.ibsrv.net/gimg/www.rcu...78aef2eff8.jpg https://cimg4.ibsrv.net/gimg/www.rcu...50c97efb05.jpg https://cimg5.ibsrv.net/gimg/www.rcu...a31cba1139.jpg |
My own Vortex is almost wood finished so I have started the work of the cowl and canopy. The plugs are 3D printed and then I have aplied filler and sanding before paint so they are pretty much finished now so next up is to make the molds.
https://cimg8.ibsrv.net/gimg/www.rcu...d250585bbd.jpg https://cimg9.ibsrv.net/gimg/www.rcu...b976ca97ba.jpg |
One wood finished simplified fin version of the Vortex :)
It is a bit rought as i wating with the final sanding just before covering. https://cimg2.ibsrv.net/gimg/www.rcu...966378b585.jpg https://cimg1.ibsrv.net/gimg/www.rcu...ed3c5274ea.jpg |
Very well done!!
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Originally Posted by Krille
(Post 12565627)
One wood finished simplified fin version of the Vortex :)
It is a bit rought as i wating with the final sanding just before covering. Now i really miss working on my Vortex :) |
Thanks Alex.
@Krille,3D printing the part seems to work very well. |
Originally Posted by GootyS
(Post 12565843)
Thanks Alex.
@Krille,3D printing the part seems to work very well. The mold for the cowl is now ready. Planing of making the first cowl soon. The mold stil needs some cleaning up from the blue mold clay. https://cimg9.ibsrv.net/gimg/www.rcu...fd26642713.jpg https://cimg1.ibsrv.net/gimg/www.rcu...5f8a58bfa0.jpg https://cimg9.ibsrv.net/gimg/www.rcu...feb5f513c2.jpg |
Great work both !! I will be building one as soon as I finish current project. I´m not super fan of the cowl shape and maybe I divert a little from that.
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@Krille, what landing gear are you using on your model?
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Originally Posted by GootyS
(Post 12571483)
@Krille, what landing gear are you using on your model?
The first cowl is out of the mold. I use resin infusiuon with vacuum to get the optimal resin/fiber ratio. https://cimg4.ibsrv.net/gimg/www.rcu...38635c1f9f.jpg I made 2 version. One with 2 layers of 160g m2 carboon. Final weight for one cowl half is 55g (left one in picture) And one with one layer of 110g fiberglass and one layer of 160g carboon. The weight is 44g for that half (right one in picture) The lighter version is probobly strong enough but i will go for the stronger one. About 110g for a complete cowl is not bad at all. https://cimg5.ibsrv.net/gimg/www.rcu...4383504c88.jpg https://cimg9.ibsrv.net/gimg/www.rcu...3864e9bdfa.jpg |
Great work Krille, the cowl looks beautiful and 110g is a lot lighter than i ever hoped for such a large part. The resin infusion process is definitely worth the extra effort.
I realized i forgot to add a few things in my previous posts, so i attached a few more images with the remaining details. I also think i made a mistake: the ESC support should probably be added after the cowl is attached to the fuselage. Unfortunately i can't edit the previous posts to change this. https://cimg4.ibsrv.net/gimg/www.rcu...f210af25ab.jpg https://cimg5.ibsrv.net/gimg/www.rcu...8f31481f09.jpg https://cimg7.ibsrv.net/gimg/www.rcu...5abbb3e313.jpg https://cimg8.ibsrv.net/gimg/www.rcu...90c82aaf81.jpg https://cimg9.ibsrv.net/gimg/www.rcu...32e4de32c9.jpg https://cimg0.ibsrv.net/gimg/www.rcu...1c00286e2e.jpg https://cimg1.ibsrv.net/gimg/www.rcu...470006afa9.jpg https://cimg2.ibsrv.net/gimg/www.rcu...0f5972476b.jpg |
Very nice!!!!!!!
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My model is now finished for covering.
Here you can se how i did with the frame for the canopy. https://cimg0.ibsrv.net/gimg/www.rcu...70282f075e.jpg Weight for the complete aircraft with motor, esc and prop/spinner is 3168g https://cimg1.ibsrv.net/gimg/www.rcu...252fc0fbd4.jpg https://cimg2.ibsrv.net/gimg/www.rcu...46bc9a9841.jpg |
Originally Posted by Krille
(Post 12574171)
Weight for the complete aircraft with motor, esc and prop/spinner is 3168g
I assume this weight is without the servos? |
I thought I should add a few words about the control horns, linkages and a suitable spinner.
There are many options on the market for the control horns, but the ones included in the drawings were designed specifically for the Vortex so i would recommend using them. For the rudder pull-pull system i had to consider that the wires are crossed inside the fuselage and go out through the small bowden tubes (representing 2 fixed points). I determined that a 3mm offset on the rudder servo arm is needed to make sure both wires are slack-free at all rudder deflections. Without this offset, one of the wires would be tensioned while the other would go slack when the rudder is working. The aileron linkage geometry was designed to keep 90 degrees angles between the pushrod and lever arms, which should result in a perfectly symmetrical movement of the ailerons. If different control horns are used, the geometry of the linkage can be compromised and the model may need some differential mix. Even if the maximum throw of both ailerons is equalized using the endpoint adjustment in the radio, it is possible to have small differences between the 2 ailerons at intermediate stick positions. My plan was to manufacture my own spinner so the nominal diameter is not standard size (89mm). But since the cowl nose is 5mm longer, an 85mm diameter spinner can also be used. I think the best match for the Vortex cowl shape is this 85mm Mejzlik spinner: https://shop.mejzlik.eu/detail/spinner-34-3744 https://cimg3.ibsrv.net/gimg/www.rcu...2bf049c7af.jpg https://cimg5.ibsrv.net/gimg/www.rcu...5325326497.jpg |
Originally Posted by Alex Voicu
(Post 12574175)
Beautiful work, it feels good to see a complete airframe ready for covering.
I assume this weight is without the servos? Weight without motor, prop, esc and spinner is 2330g (landing gears included) |
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Center of gravity position and incidence angles
https://cimg9.ibsrv.net/gimg/www.rcu...91ed026068.jpg |
I’ve been thinking about a paintscheme for Vortex, and since i didn’t have too much time it was easier to start with the existent Audax scheme and modify it. I also tried to generate the templates for film covering; these can be used as a starting point but it’s impossible to perfectly unwrap all the compound curvatures to a flat surface. When covering the Audax, most of these templates were ok, but for some of the colors that were applied on top of others i had to use transparent film to get the perfect shape. The differences were small though and the templates were still useful to trace the curves through the markings on the plastic film:
https://www.rcuniverse.com/forum/12194939-post132.html The templates can be found at the link below and they can also be useful if you choose to paint the model. Obviously they need to be printed at 1:1 scale, and if you print the them on multiple A3 sheets, the red lines included in the templates can be used to align them correctly. The blue lines represent the theoretical centerline or edge of the fuselage, but since we can’t expect the templates to be accurate down to the millimeter, we need to cut the templates and film pieces larger in those areas. For the fuselage, the white color comes first and the wing/stab holes can be used as a reference for positioning. All the other colors will follow the edges of the white color. The white stripe at the base of the canopy is not part of the fuselage templates because it's actually painted on the canopy. https://drive.google.com/open?id=190...1zU18MUyCQbX50 https://cimg2.ibsrv.net/gimg/www.rcu...c889b8f667.jpg https://cimg5.ibsrv.net/gimg/www.rcu...09af14a249.jpg https://cimg6.ibsrv.net/gimg/www.rcu...50a83641da.jpg https://cimg7.ibsrv.net/gimg/www.rcu...4803154456.jpg |
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