Insane Foamies Mini Yak-54 build/fly thread! - RC Groups
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Aug 03, 2005, 12:51 AM
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emnm79's Avatar

Insane Foamies Mini Yak-54 build/fly thread! - VIDEO

Hey folks, I got lucky enough to get my hands on a proto/beta mini-yak from insanefoamies, so here is the build

Picture 1: All parts dry fit together flawlessly, note: the kit comes unpainted, so I busted out the airbrush and some faskolor, and went with a semi-somenzini paint scheme. The kit includes a paint mask for the canopy (3 section yak45).

Picture 2: This plane uses two 3mm thick carbon fiber strips along the leading and trailing edges of the wing for spars, I put a small bead across the edge of the wing with some odorless CA, and sprayed the CF strip with some kicker. Carefully and quickly line up the cf, and pinch it and run your hand down 1/2 of the wing centering the CF in the process, hit that half with a few sprays of kicker and repeat the process for the remaining side of the wing, and then do the trailing edge in the same 2 steps. note: you can also use UHU creativ by letting it set for about 5 minutes, then taping the cf on. Once completed, the wing is very stiff for its weight, and shouldn't require any extra bracing, at least for indoor flight.

Picture 3: Run a peice of tape over the CF from tip to tip and press it down on each side of the wing. I used 3M transparent tape, but as soon as my blenderm tape arrives, I will be redoing all the tape on the plane.

Picture 4: Bevel and hinge ailerons with sanding block and hinge tape. You can use a sharp exacto knife, but I find that a sanding block is much easier, precise, and harder to screw up.

Pictures 5: Bevelling tail with a sanding block.

Pictures 6, 7, and 8: Begin to fit fuse together without glue, everything snaps together and lines up perfectly.

Pictures 9 and 10: Glue the top and bottom fuse halves together at the circular joints. I just CA'd it, aligned it with one hand and kicked it with the other, straight as an arrow.

More in just a minute
Last edited by emnm79; Aug 06, 2005 at 11:31 PM.
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Aug 03, 2005, 01:03 AM
Yakkin' it up!
emnm79's Avatar
Picture 1: Glue sides of fuse together infront and behind wing. I didn't need to adjust mine, they were perfectly square as is.

Picture 2: Slide horizontal stabilizer on, and glue each side to horizontal fuse, then vertical fuse. I glued, aligned, and kicked, and it came out perfect

Picture 3: Tape ailerons onto fuse with eqaul gaps to align the wing sideways.

Picture 4: Check that the wing is perpendicular to the fuse, and glue it in.

Picture 5: Almost* completed airframe. Still needs tail stiffeners installed

Picture 6: 32" wingspan

Picture 7: 30" fuse

Picture 8: The belly

Picture 9: Tail stiffeners being beveled at 45 degrees on each side.

Picture 10: The stiffeners are joined to the underside of the tail to creat two super stiff triangles to eliminate any tail flex.
Aug 03, 2005, 01:06 AM
Yakkin' it up!
emnm79's Avatar
Picture 1: Power system ready to install

Hacker A20 34S pushing APC 8x3.8 SF prop on a hyperion oring adapter
Hacker X7 ESC
Thunder Power 2S 480Mah LiPo
GWS Naro 6Ch rx
GWS Pico FBB aileron servo
Bluebird 303 tail servos
CF linkages

Picture 2: Measure and cut for your motor.

Picture 3: Cut and mount plywood motor mount.

Picture 4: Motor installed.

Picture 5: Aileron servo setup. simply cut a slit in the control, apply CA to the control horn and slide in. Make linkages with included music wire, EZ connectors, and EZ clevis. I had to change the linkage on the servo horn because the servo is set on the side of the fuse, in order to acheive equal throws on each surface.

Picture 6: Elevator servo setup. I used the included ply sheet and screwed the servo into them, very light, very tight, and very easy to remove servo

Picture 7: Rudder servo setup. I used servo tape for the rudder, and it is holding fine. You could also use the ply in this case, but I figure I'd try out the tape.

Picture 8: Tailfeathers and their control horns. I used dental floss wrapped around the cf linkage and a peice of z-bent music wire for the linkage.

Picture 9: Completed power system.

Picture 10: Added tri stock to reinforce fuse. I don't think it is necessary, but the plane is pretty light, so this little bit can't hurt it too bad.

Picture 11: Added carbon reinforcement to tail along the hinge. I took the included cf, cut to length, and taped in place, now the tail is very stiff with no control flex.

Next: Flight Report
Aug 03, 2005, 01:09 AM
Yakkin' it up!
emnm79's Avatar
AUW is right around 6oz, and I'm sure you could go lighter using less glue, no tri stock, and lighter electronics.

I took the plane out to my mom's gym for the maiden. This was the first time I've ever really "flown" inside, I have hovered stuff indoors alot, but it never really left high alpha. The plane was pretty easy to handle with 30% expo on the ailerons and elevator, and 35 degree throws all around. The hacker on 2S is very peppy, and not lacking in power by any means, I only took it to full throttle once, and it was way too fast for indoors It torque rolls smoothly, harriers have no rock, and it floats like a feather. Since this is a new plane, there isn't a definite CG yet, so next flight I will move it back a little, and give 45 degree throws all the way around, and hopefully buy a radio with some rudder exponential I should have a video of the flight up by tomorrow. Enjoy!

Update: put another good flight on film, outdoors this time, and did a little accidental crash testing when I ran into the battery cut rather abruptly The plane handled it well, only a few drops of ca and kicker and it was all good. When I saw it coming I cringed, thinking It would rip the tail off, but if you build it light, there isn't much weight do do much damage
Last edited by emnm79; Aug 03, 2005 at 01:17 AM.
Aug 05, 2005, 01:26 AM
Registered User
Where's that video and is it going to be inside or out?
Aug 05, 2005, 02:47 AM
Yakkin' it up!
emnm79's Avatar
ack!! my bro is back but he's having troubles w/ the server, all my other stuff is down too I'll go bug him some more tomorrow, or host it elsewhere, sorry for the wait

The video will have half indoors and half outdoors
Aug 05, 2005, 02:25 PM
Registered User
No Problem How does she do outside?
Aug 05, 2005, 05:46 PM
"$$Crashable Income$$"
ive been looking for a better option for the hobby lobby yak55's ive been building. something made of real depron would be realy great. this kit is looking very nice. the wingspan is a bit too much though. its kind of big for a 'mini' foamy 3d plane, imo.

i realy like the simicircle keys in the vertical fus segments and i think the rudder is set up stock for way more throw than the hl yak55 is.

the auw was about 6oz? with battery? thats a fantastic wing loading, i bet it flys great. i think the foam the hl yak uses is a tad more than 6mm and is more squishy than real depron. i bet it accounts for alot of the weight savings here.
Last edited by maux; Aug 05, 2005 at 05:54 PM.
Aug 05, 2005, 09:42 PM
Yakkin' it up!
emnm79's Avatar
It flies pretty good outside for such a low wing loading, but with any low loaded flat plate, the wind can grab it pretty good, but there has been a breeze every time i've had it outside, and it hasn't been a problem...

video is over at my bro's awaiting hosting


Last edited by emnm79; Aug 05, 2005 at 10:18 PM.
Aug 06, 2005, 05:53 PM
Registered User
emnm79, Great video! looks like its flying really well.
Aug 10, 2005, 10:44 AM
Dylwad's Avatar
Nice Video! looks like you got comfortable with it pretty quick.

Aug 11, 2005, 09:39 AM
founder of the SSP
Steve Boone's Avatar
You have to love the video age! It's nice to see others having fun. You should post music credits on your video. Which brings up the question. Who was that on the video? Band/title/cd please.
Aug 13, 2005, 08:12 AM
founder of the SSP
Steve Boone's Avatar

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