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3DMON's Big Profile Yak54 Project

Discussion in '* Scratch Built Section *' started by 3DMON, Nov 7, 2010.

  1. 3DMON

    3DMON Moderator Staff Member

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    Well I thought I'd show you guys what I'm up to lately.
    Unfortunately, my 74" Extreme Flight Yak took a dump a while back and ruined the fuse beyond repair (receiver locked up about 50' up, and went in nose first). Fortunately the wings and tail section are salvageable.
    So this means I need to make an awesome profile to utilize the wings and elevators from it.
    I just received a DL20 Gas engine which should be perfect for this project. A buddy of mine just got one and put it in an OMP 67"Fusion and it is ballistic.

    The Yak will have a 69" wingspan and 61" in length. I'm guesstimating the weight to be around 7.5 to 8 lbs.

    My Phlatprinter is loving this 3/4" foam. I'm cutting it with the stock 1/8" bit at 100 ipm in a single pass, yeah baby!
    Here is what I have cut so far. Attached files [​IMG] [​IMG] [​IMG]
     
  2. kram242

    kram242 Administrator Staff Member

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    [​IMG]
    WOW Shaun you have out done yourself this time! That is AWESOME looking!
    Thanks for posting
    Mark and Trish
     
  3. Crash

    Crash Moderator Staff Member

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    Shaun, this is gonna be an incredible project! I will be watching with notepad in hand, as I have been wanting to work up a similar project. :)

    Keep us posted!!
     
  4. kram242

    kram242 Administrator Staff Member

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    Its really cool how you did the wiring recesses. I really like how they cut over through the holes. Nice job
    Mark and Trish
     
  5. 3DMON

    3DMON Moderator Staff Member

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    Progress report.

    1/6" ply front end cut out on the Phlatprinter.


    Hardwood parts glued in. The canopy area needed to be reinforced so I can have the canopy area cut out.


    Right side of the fuselage sheeted.


    I found a good use for some dead batteries I have laying around, glad I didn't recycle them yet lol.
    This is the left side drying.


    I forgot to metion earlier the foam is 3/4" white styrene foam. The sheeting is 1/16" ply up front and 1/16" balsa in the back. I will be capping the outer perimeter of the fuse with 1/8" balsa.
    I'm getting closer... Attached files [​IMG] [​IMG] [​IMG] [​IMG]
     
  6. ToxicToast

    ToxicToast Down in the weeds. Staff Member

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    Great designing, Shaun!
     
  7. kyyu

    kyyu Active Member

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    I was thinking the foam would be too weak, but I see the master plan, now. What glue are you using for the sides?
     
  8. kram242

    kram242 Administrator Staff Member

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    Its really nice to see how well those wood parts go together!
    'Mark and Trish
     
  9. TigerPilot

    TigerPilot Well-Known Member

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    What kind of a motor are you going to use, Shaun?
     
  10. 3DMON

    3DMON Moderator Staff Member

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    Thanks guys!

    I used 30 minute epoxy and gorilla glue to glue things together. The fuselage is very strong but it still fairly light for its size.

    I am putting a DLE 20 20cc gas engine on it. The engine produces around 14lbs of thrust and the plane total weight should be around 7.5 to 8lbs.
     
  11. 3DMON

    3DMON Moderator Staff Member

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    I've decided before building the Phlatprinter I need to get more work done on the profile so I can get it out of the way. Very tough decision though.

    Here is what I got so far. Attached files [​IMG]
     
  12. kram242

    kram242 Administrator Staff Member

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    Shaun that is looking great!
     
  13. 3DMON

    3DMON Moderator Staff Member

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    Not much further now. I still need to cover the rudder.

    Attached files [​IMG]
     
  14. xtremeRCpilot

    xtremeRCpilot Member

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    Awesome Shaun, looks Great!!! Please Keep us updated on your build and flight! :p

    John
     
  15. mavacpjm71

    mavacpjm71 New Member

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    Man Shaun! That looks simply Awesome! Way to go my friend!!! :mrgreen:
     
  16. ToxicToast

    ToxicToast Down in the weeds. Staff Member

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    Shaun, that is looking awesome! One question tho- how are you planning to keep the gas out of the foam? Last I checked, the two should never meet. Would seem like there is some potential for a 5 min flight to get interesting as the plane turns into a glob of goop with balsa wings! :shock:
     
  17. rcav8r

    rcav8r Moderator Staff Member

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    Good question. I have seen quite a few giant "foamies" suffer from this. Byron had a few giant foam airplanes awhile back, and the few at our field suffered this. The problem with them was it was a standard firewall mount, not the type you are using. Also there was no sheeting.

    With that said, the build LOOKS GREAT
    . There was a guy that used to visit our field a while back that used to bring a Giant profile much like yours, only he had foam ribs in the wing/tail, and the wing/tail was sheeted with foam, and covered with iron on covering. He had a ZDZ80 in it, and this was the first plane I ever saw do a real knife edge loop. He would bottom out of the knife edge loop less than a wing span from the ground. REALLY neat stuff. Last I heard the plane was stuffed after many years of hard flying, and the gas wasn't a problem getting to the foam.
     
  18. 3DMON

    3DMON Moderator Staff Member

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    Thanks guys!

    Toast,
    The foam has been sheeted with balsa the I used ultracote to cover it. Gas isn't going to get in there.
     
  19. Crash

    Crash Moderator Staff Member

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    Wow, Shaun! This thing is looking very nice! Talk about turning lemons into lemonade (crashed plane resulting in a new project to use up the leftover good pieces).

    I can hardly wait for a finished product and a flight report!
     
  20. 3DMON

    3DMON Moderator Staff Member

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    Yeah man! And I'm sure I'm gonna like the way it flies better than before. I like big profiles. :)
     
  21. dugd1013

    dugd1013 Member

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    Have you given any thought to going electric instead of gas? I did a similar project last spring with a layered all EPP 60 inch flat wing plane. (Leadfeather Edge 540) I used an Eflite Power 46 motor with an Eflite 60 amp ESC and a 14x7 APC electric prop. 4S 2250 packs were good enough for basic flight but 5S 3000 is where I ended up in order to get 7-8 minute flights and 50% pack usage. My plane came in at a very similar weight. I forget exactly but I believe it was 6.5 lbs before I started making upgrades for faster flight and stronger surface control. (MUCH larger carbon spar and 100 oz servos) We snapped the original spar and a couple of control horns, along with a stalled rudder servo and a torque crunched set of aileron servo gears! Several of the local stick bangers took turns beta testing the plane!

    I didn't use any ply or balsa sheeting on any of the surfaces however, I did use a preformed balsa leading and trailing edge on the wings, rudder & stab. My plane doesn't currently have removable wings. Seeing your design started the wheels in motion for that upgrade. I'll have to do a little sheeting to accept a carbon tube but, I don't think it would be too much trouble.

    Doug
     
  22. 3DMON

    3DMON Moderator Staff Member

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    Hey Doug,

    Yes I have but I like electric for the 40 size and under. When this DL20 came out I was very excited. I like electric and all, but there is just something about the gas planes I like more. :D
     
  23. 66tbird

    66tbird Moderator Staff Member

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    Looks like a real winner Shaun. The proportions for motor to weight for the design just makes me smile :D Really looking forward to the vids. Should give lots of cheap flying with great performance.

    Byron Models were a descent ARF for the day and many met their end do to fuel soak failure, (thou most were in flight servo strips(flutter)). But if they were wiped down when landed they could last a while. Tank or line failure was the point of no return for that media. Anyone recall what they looked like when they hit hard? Like someone just shredded a big $4 foam ice chest while tossing a bowling ball(the motor) :lol: Usually a 100 piece crash minimum.

    btw-
    Isn't weird how we remember those things. Another, 'you know your an RC nut when' answer.
     
  24. Crash

    Crash Moderator Staff Member

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    Wow, tbird. You just brought back some memories for me! If Byron Originals were around today, they would be uber-successful in the electric market! I wonder if the molds are still around? Hmmm...
     
  25. 3DMON

    3DMON Moderator Staff Member

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    The Yak Flies!

    I am very happy with the way this plane turned out. It flies awesome! The characteristics are far better than when it was a 74" full fuse. It has a lighter wing loading which I'm sure is one of the reasons it flies so great.
    Engine is still in breakin stage so I probably wont get too low until I can trust the engine more.
    A friend got some video and put it on his youtube account. After I get the engine broke in some I'll get some more video.

    The best part now is I can start building my Phlatty 3. :D






    Attached files [​IMG] [​IMG] [​IMG] [​IMG]
     

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