Cut and glued the doublers for the wing lock and anti rotation pin areas
4 meter Plank - Build thread
- Thread starter thenated0g
- Start date
So here's the wing join mostly figured out on the #4mplank . The two blocks of wood on top will be flush glued into the foam and after it's vacuum bagged and fiberglassed I'll thread those and use nylon bolts to connect the wing to the fuselage. I still need to take my carbon tube down to the hardware store and find an aluminum tube that will be the joiner across them.
bracesport
Legendary member
Woah - those hot wire cuts are sweet - very envious! 
As usual I've been playing around with some different colors I think I may do the bottom white and then sharpie on some feathers
Heres some pics of me setting the root cap hardware in place with epoxy. Came out pretty good. Really sticks with that wing lock and doesnt want to twist at all with that piece of carbon in the back. You really need that wedge to get the wings apart.
I also made up some plans so i can make both sides the same but also know where to drill into the wood wing plates after the fiberglass is on and i cant see in to the wing anymore
And i glued in one wings carbon tube in prep to epoxy on one of the the root caps above.
I have a schedule i made to try and get this done by may 1st.
By the end of Feb i need to have all the internal parts installed in the wings. Root caps, carbon tunes, wing hold down blocks, servo wiring, and all 3 pieces of foam glued together. Basically ready for vacuum bagging.
Than i gave myself all March to do the fiberglass and vacuum bagging.
Leaving April to finish up. I think that will be doable.
I also made up some plans so i can make both sides the same but also know where to drill into the wood wing plates after the fiberglass is on and i cant see in to the wing anymore
And i glued in one wings carbon tube in prep to epoxy on one of the the root caps above.
I have a schedule i made to try and get this done by may 1st.
By the end of Feb i need to have all the internal parts installed in the wings. Root caps, carbon tunes, wing hold down blocks, servo wiring, and all 3 pieces of foam glued together. Basically ready for vacuum bagging.
Than i gave myself all March to do the fiberglass and vacuum bagging.
Leaving April to finish up. I think that will be doable.
bracesport
Legendary member
I keep forgetting how big this bird will be!
Yeah that foam on the bench isnt even half of one wing lol. Thats 30" on the bench. I still have another 30" and 20" section to glue on it.I keep forgetting how big this bird will be!
Here's the full Left side, 80 inches.
bracesport
Legendary member
It is big - but not too much bigger than your plank on the racK!
That white powered one on top is 90" fpv wing. The blue one below it is 96" total. The 4m plank will be 160" total. yikes
wrong root cap for the picture, but you get the idea. Thinking i will us gorilla glue as it fills gaps well, but will see.
Left root cap Gorilla glued on.
Started marking out parts to get an idea of where the servo should/can go.
Where the elevator servos are going i have like 20mm thickness but for these ailerons i only have about 12-15mm of foam. So i will probably be getting some higher end servos so i still have good strength in a small servo.
The elevator servos are going to have like 20kg torque fail and the ailerons will be about 6-7.5kg of torque. The 20 is overkill but aloft has some nice quality servos that will fit in that area for about $17 each. The wing servos are going to be like $40 each. I really didn't want to go to dual servos for the surfaces.
Another thing i checked was the surface area of the elevators vs the ailerons. I am going to be doing crow braking which is when the ailerons go up and the elevators go down. This creates drag. They need to counteract each other as when the elevators go up the plane pitches up so the ailerons need to counteract this so that when crow is added it just slows the plane down not pitches up or down violently. So for example knowing that the ailerons are much bigger than the elevators would tell me that they need to move less in crow than the elevators. In my case the ailerons are about 8% bigger than the elevators but the elevators are farther behind cg than the ailerons so will have more effect on pitch so im hoping its a wash.
I am thinking i will probably have some mix on my radio where i have two dials. One dial controls the ailerons up setting and the other dial controls the elevators down setting. And than a switch that turns both of those on or off. That way i can get up high, slowly dial in each of them until i find the maximum travel where i still have roll and pitch control. And finally have the throttle setup so that when the "landing" mode switch is activated the travel of throttle goes from zero crow up to the 100% crow that i had set with those dials. Obviously disabling those dials once i figure out the travel maximum.
Started marking out parts to get an idea of where the servo should/can go.
Where the elevator servos are going i have like 20mm thickness but for these ailerons i only have about 12-15mm of foam. So i will probably be getting some higher end servos so i still have good strength in a small servo.
The elevator servos are going to have like 20kg torque fail and the ailerons will be about 6-7.5kg of torque. The 20 is overkill but aloft has some nice quality servos that will fit in that area for about $17 each. The wing servos are going to be like $40 each. I really didn't want to go to dual servos for the surfaces.
Another thing i checked was the surface area of the elevators vs the ailerons. I am going to be doing crow braking which is when the ailerons go up and the elevators go down. This creates drag. They need to counteract each other as when the elevators go up the plane pitches up so the ailerons need to counteract this so that when crow is added it just slows the plane down not pitches up or down violently. So for example knowing that the ailerons are much bigger than the elevators would tell me that they need to move less in crow than the elevators. In my case the ailerons are about 8% bigger than the elevators but the elevators are farther behind cg than the ailerons so will have more effect on pitch so im hoping its a wash.
I am thinking i will probably have some mix on my radio where i have two dials. One dial controls the ailerons up setting and the other dial controls the elevators down setting. And than a switch that turns both of those on or off. That way i can get up high, slowly dial in each of them until i find the maximum travel where i still have roll and pitch control. And finally have the throttle setup so that when the "landing" mode switch is activated the travel of throttle goes from zero crow up to the 100% crow that i had set with those dials. Obviously disabling those dials once i figure out the travel maximum.
Little video up to this point
Got one sides wing bolt blocks glued in flush.
Used a dremel and a straight edge to get a slot for the servo cables. Making sure to document exactly where i placed the wire as its going to be totally hidden after the painted fiberglass sets.
I used low temp hotglue and a ID card scraper to cover the top. Than took a baking sheet/paper and an iron over the top to smooth it out.
I used low temp hotglue and a ID card scraper to cover the top. Than took a baking sheet/paper and an iron over the top to smooth it out.
Wing tips cut and sanded
I saw @Mid7night 's post about using foamboard as the core foam when vacuum bagging so i am going to try it on the vertical stabilizer.
Sweet! I'm anxious to see your results. How many layers, and what weight glass are you going to use?
@Mid7night as i have some extra from previous projects im going to try (on each side) one layer of 6oz S-glass(15% stiffer 30%stronger, this is stronger than carbon fiber but a little heavier, but drastically cheaper) with one layer of 3oz E-glass on top of that for a better finish. If that is not strong enough i purchased like 10 yards x 30" of 4oz S-Glass that i can do another one with more layers.
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