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Bluecore Wing build from FFF

Old 01-02-2009, 06:08 PM
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pburt1975
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Default Bluecore Wing build from FFF

Everybody loves a good, cheap, fast wing right? I found this thread over at RCG a year ago and built one then. That one is long gone now but I had to have another.
Thanks Scottflight for a easy build thats loads of fun.
Pictures are in order of notes


First thing I did was cut the wing panels. Its a little wasteful to use the factory fold in the FFF, but sure makes for a nice LE.
(hint, to make things easy on yourself, draw 1 half of the wing panel on one side of the fold, then cut it out to the fold. Then fold that over to trace for the other side. then copy for the other wing panel.)

Next, put the inside edges together and stick some tape on to hold it in place. You can skip this step and move to the next which is packing tape on the outside seam, but I find its easier to tape on the inside to hold it in place because the folded panels make it spring up. You'll understand if you build one this way.

Ok, taped on the outside, flip it back over and remove the pieces on the inside, they aren't needed anymore.

This is another step you can skip, but it does reassure me things wont come apart in flight. Simply cut some balsa to lay cross grain of the seam.

I just hot glue the balsa pieces in place, actually, hot glue is the primary glue for this project. its quick.

Then the motor stick gets mounted on top of the balsa pieces. There is just a tad of right thrust thrown in. And the spar lines are drawn.

The spar is then cut and glued in place. I made mine 13mm at the fuse and 7mm, 2" in from the wingtip. Its amazing how much this spar stiffens the wing, but you can use what ever material you want.

The last 2 pictures here are of the top panel being glued to the spar. I covered the spar with UHU creative contact cement then closed the panel up and reopen it. At this point the glue was on both the spar and where it contacts the panel. After 10 min I put 4 spots of hot glue on the spar and closed the panel again.
If you look in the last picture, you'll see where the spar is in the panel.
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Last edited by pburt1975; 01-02-2009 at 06:25 PM.
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Old 01-02-2009, 06:25 PM
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After the spar has been glued down its time to glue the back edge. Sorry I have no picture of this step, I got wrapped up in working. But you just take the hot glue and run a bead on the inside of the TE and press and hold the 2 together til the glue sets.

The first picture here is a front view of the wing closed up.

Second picture in this series is where I thought the wing was just a little boring. Time to build a fuselage.

Turns out its the perfect place for the battery, esc and RX. The servos will mount into the wing outside of this fuselage area.

The hatch is held in place with tape for the hinge and hook and loop for the latch.

Plenty of space in there.

Last picture is where things ended up this morning, after about 2 hours of work. Elevons and winglets are installed, elevons are hinged with the same tape running down the seam. winglets are just a 45deg triangle the length of the wing tip.


Power system for this will be the tower pro 2408-21 running on a 1500mah 20c 3cell battery. I'll have to get a prop for it, smallest I have is a 8x6 apc, or a 9x3.8 sf. Tonight when I get back into the build I'll weight the airframe at this point and with the proposed components.
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Old 01-03-2009, 03:38 AM
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pburt1975
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Ohh to be so light... Components tossed on board for a weight, 10.74 oz. It'll work out to around 11oz with linkages on. Man this is going to be a floater and I may cut down a 9x3.8 to 8 so I can get it in the air this weekend.

Hope to get this finished tonight, all thats left is mount servos and glue components on.

time to go play again.
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Old 01-03-2009, 12:31 PM
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Default All done except for the crash

And here it is all wrapped up.

First picture shows everything tucked into the hatch area. Everything is where it needs to be to for the COG to be "in range".

Second shot shows the vent into the hatch area

Next 2 shots are side shots to show the final wing

The last shot is a top view and you can see where I had to move the elevon servos back an inch. It wouldnt balance with the battery pack in the hatch area until those were moved.

All thats left now is the crash
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Old 01-03-2009, 12:54 PM
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Final flying weight, 11.5 oz
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Old 01-03-2009, 01:20 PM
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gfdengine204
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Very sweet! Can you take a pic of your hinge and bevel(s) for your elevons, please? I'm curious how that attaches.
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Old 01-03-2009, 02:01 PM
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Yeah Kev, I'll get a picture of that. Apparently I have 1 or 2 more pictures to take anyway. Boredom set in with the little girl first thing this morning, so we put some more color on it.
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Old 01-03-2009, 02:24 PM
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Here you go Kevin. Nothing special about the hinging at all.

The TE of the wing gets beveled on the inside edge to a 45deg angle, you can see this in the 2nd shot. Because of that, the Elevon does not need to be beveled.
The first picture shows that the top is just a full length piece of packing tape and on the underside there are a few strips (like you see in the second photo) on the bottom that roll with the hinge line. The underside strips are, 1 at the tip of the elevon, one in the middle of it and one at the fuse end of it.


Last 2 photos are final shots. No more ink goin on this bird, lol...
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Old 01-03-2009, 02:28 PM
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gfdengine204
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Cool beans Paul, thanks. Are both layers of the TE of the wing beveled, or just the layer that the elevon is taped to.

And, where did you get the cool looking Lightmax sticker? I'm jealous!
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Old 01-03-2009, 02:45 PM
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pburt1975
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Originally Posted by gfdengine204 View Post
Cool beans Paul, thanks. Are both layers of the TE of the wing beveled, or just the layer that the elevon is taped to.

And, where did you get the cool looking Lightmax sticker? I'm jealous!

Yeah, both layers are beveled to the inside. I dont know if it would work with only 1 of them done

Stickers came from Hobbyking, possibly with the Zippy lipos, Turnigy stickers are from there also.

Dustin did the elevon flames and Sara helped me sharpie the underside.
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Old 01-03-2009, 02:50 PM
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Alright sweet. Now to clean my table and have some room.
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Old 01-04-2009, 02:01 PM
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pburt1975
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Hey Kev, ya done yet ?

charging batteries now and hope to maiden in the next 3 hours
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Old 01-04-2009, 02:18 PM
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LOL No Paul, my shop is still a disaster area. I might have something on my table soon, something laser cut my wife might get me for my birthday this month.

And I'm STILL wading thru the thread at that other place.....50 pages! Dang!

Can't wait to hear your maiden report.
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Old 01-05-2009, 12:53 PM
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Sorry I've no flight pics, shoot we didn't even take a camera to the field yesterday, just happy to go!!! Man, what a hoot this wing is. The 2408-21 on 3s with a 9x47 prop to start things off. even then it was pretty quick and scooted around with authority. We flew 2 batteries through it like that then changed up to a 7x6 prop with a new battery, and WOW!!! When the nose pointed up, that was it! ZOOOOOM!

Next time out I'll have to adjust the ATV on the TX. I had them turned down 1/2 way for the day because the boys were going to fly also, but even then it would drill through the air. (I want more drill!!)

I do need to take after photos tho.. It came in HARD on the nose. Bent the 1/2" of prop shaft sticking past the bell at a 30deg angle and dislodged the battery from 3 strips of velcro, sending it through the nose. The wing is utterly undamaged. The only real damage it sustained is to the winglets that started to roll after all of the belly landings.

Tonight I'll get that prop shaft changed and get this plane in my trunk for those lunch flights!

I will say this one didn't have the same smooth glide as the last one. Cut power and it would kind of float down but needs stick input to keep the nose high, but not so much as to stall it out. Thats how the boom happened. at about 7-10 mph it just fell out of the sky and with my sons hands on the stick, well the experience wasn't there for a recovery. No biggy, it will fly again and so will he, lol..
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Old 04-13-2009, 05:49 PM
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Wrench66
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Default New build in an old thread :)

I built and just flew one of Scottflight's FFF wing's today with fantastic success
I built this one as planned and only had to adjust my CG back a bit (it wouldn't glide with the recommended 7" CG....I am back beyond 8" with mine!
A little down on speed, but I can deal with that as the airframe is absolute spot on.
I am using an Emax 2805 with a gws 6x3 prop, a tower pro 30a esc and a Zippy 3s 1000mah battery. The second flight ended at almost 10min so I think I can add more power and still be within reasonable amp draw.....I will try a 5x5 prop next time.
My auw is 13oz btw.

great fun!

--Ray
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