VAS Specter v3 Build – Part 9 : connect fuselage to wing and motor install

VAS Specter v3 Build – Part 9 : connect fuselage to wing and motor install

The connection of the fuselage to the wings was very similar to the tail pieces with the exception that i also needed to cutout a place in the wing for the motor. Again mainly this involved lightly clamping things together and measuring over and over comparing both sides on top and bottom before cutting away the laminate and cutting thru the wing.  I probably cut a little bit more than i needed off of the wing, but after seeing how well epp glues to itself and plastic i knew i could just fill these spots in later and have a solid connection. image

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In one of Jeremiah’s comments on either facebook or youtube, he had mentioned that he liked to fill in the cutout spaces with some shoogoo, as this gives a very nice surface to stick things too like velcro. I have tried this on a couple planes and sticky back stuff LOVES shoogoo surfaces. Works awesome. So since i had to wait for e6000 to dry i added shogoo to the compartments facing up. image

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Its a little hard to see whats going on in this picture, but what i have done is placed a scrap piece of carbon fiber flat stock across the top of the motor so that the motor is pushed down on to the bottom plate of the fuselage. When i initially tried just sandwiching the motor plate between the top and bottom fuselage pieces it made the motor have a very strong downward angle. After this dried for a few hours i went back and applied glue to the top fuselage piece and glued it down. I also took some scrap pieces of epp and glued the edges of the wing to the motor plates. imageimage

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This picture shows how close the tail booms are to the 9×6. Probably have 1/8 to 2/8 of distance. I have spun up the prop with no problem and the booms are pretty stiff, but in a crash i have no doubt its going to make contact. image

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VAS Specter v3 Build – Part 7 : tail assembly

VAS Specter v3 Build – Part 7 : tail assembly

 

The connection between the tail booms and the tail section is a pretty simple thing to accomplish, but i almost made a mistake that i didn’t realize for several days later. In mocking up the connections i knew it had to be square but i wasn’t sure exactly where i should put them on the horizontal stabilizer. I knew they went outside the vertical stabilizers, but even with that you have several inches to play with. The other connection on the wing is the same angle all the way out so it didn’t really matter on that side (i thought!!More on this in a later part). So making my decision based on aesthetics, i decided to line the outside edge up with the spot right where the 45 cut starts on the horizontal stabilizer, not only using a 90 degree for reference but also measuring the distance between booms all the way down.

As the booms are one of the weaker points on the plane I didn’t want to weaken them any further by making cuts into the foam to hide cables. So i used packing tape to attach it to the plane. Packing tape sticks extremely well to laminate. After i did this i definitely added this in my mind as an option for the rest of the plane if i don’t want to cut into it. image

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VAS Specter v3 Build – Part 6 : motor mount, stabilizers, and servos

VAS Specter v3 Build – Part 6 : motor mount,  stabilizers, and servos

The Motor mount is made of 4 pieces of thick plastic. The holes and tabs fit tightly together. Not hard to get together but tight enough that with some glue there is no fear of it coming apart. The kit comes with several motor mount plates so that you can fit a number of different bolt patterns depending on what you are using. The large hole is for threading a plastic bolt thru the top of the fuselage, thru the motor mount, and into a plate in the bottom of the fuselage. This would make it easily removable. I am going to mount it permanently with the bolt and glue.image

imageAs i stated in the beginning posts, the tail section is not touched on specifically in the build videos. In hindsight i see now that the cuts in the horizontal stabilizer were the relief cuts for the elevator. The vertical stabilizers get installed NEXT to that cut, not on it like i did. This caused me to have to make my own relief cuts. The hinge in created by removing one layer of plastic on the bottom of the coroplast. If you haven’t worked with coroplast before, it is very strong. Although it is easy to bend and deform it is very hard to tear or rip it without something sharp to start a cut, so this should hold up to alot of abuse. The control horn is made of a top and bottom plate held together by screws, which i also glued.

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The aileron control horns are something new to me, having only used wood glue in horns in the past. They have one plate that slides up and goes on the top of the aileron and another that goes on the bottom. There is alot of force needed to squish the foam enough to slide the locking plate on. This combined with glue on both surfaces should ensure it never comes off in an accident. image

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VAS Specter v3 Build – Part 4 : Build Mods and Reinforcement

VAS Specter v3 Build – Part 4 : Build Mods and Reinforcement

A few months after Alex made the specter build videos he came out with another video. It was some tips on how to make the plane stronger, specifically what to do to make its common break points stronger. When i placed my order with stoneblueairlines.com i also asked them add on the spars i would need to make these mods.

They are very easy mods to do. Basically just cut a shallow slit, squirt in blue along the entire cut, and insert the spars. Same with the Popsicle sticks. Since i had some left over glass fiber i added a few pieces to the nose area.

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The kit comes with two glass fiber spars that are inserted one inch back from where the wings meet on the leading edge. They are almost as long as the wings. They seem very flimsy by themselves. After you glue one on the top of the wing in a shallow cut and than glue another one right below it on the bottom of the wing, it creates what Alex calls an “I-beam”. As i found later, this combined with laminate makes an incredibly stiff wing. No matter which way you bend the wing (climbing or diving) you are being countered by one of the spars.

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