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  1. #4176

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    RE: L39/Wren 44 Pics and video


    ORIGINAL: Yann

    HEYYYYYYYYYYYYY James, what have you been up to... since 2005?
    Hi Yann!
    2 kids, running 3 business' and almost finished the a-10! There's only one thing better than a plane with one 44, and that's a plane with two of them! Just did the first runs on them today and sounds awesome as a pair!

  2. #4177

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    RE: L39/Wren 44 Pics and video

    I have today received a Wren 44 Gold today for a new good home.
    Now were was it that partly built plane, two spare bedrooms full of models no,
    ARE behind living room TV
    It's Time

    Cheer's for now

  3. #4178
    Gary Arthur's Avatar
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    RE: L39/Wren 44 Pics and video

    Curious...Has anyone used the tank in wing that Savex supplies? If so, how well to they drain? Do they drain completley? How is the clunk set up etc?

  4. #4179
    Bob_B's Avatar
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    RE: L39/Wren 44 Pics and video


    ORIGINAL: H.Dale

    Yann what is the distance between your turbine and the pipe? I am remounting my 44 and I want to make sure I have the proper distance.

    Straight from the new 44 Gold manual the distance is 25mm between nozzle and pipe face
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Cincinnati Jet Club, Team Futaba, Esprit Models

  5. #4180

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    RE: L39/Wren 44 Pics and video

    HI ALL
    The best for up & coming Season greetings,

    I have a Wren 44 gold with pipe and a Jet Cat P-20 with pipe ALL new in boxes
    Strewth this thread was a long read.

    Question: Will the HobbyKing L39 be aok for the 44Gold or P-20? The wings are done finnish with EFlight retacts.
    I know this thread is about one brand,just about but still wish to know.
    The HK L39 is made with FG not carbon f.

    Cheer's
    ps one of these will get used

    Thank's again

  6. #4181
    Dr Honda's Avatar
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    RE: L39/Wren 44 Pics and video

    The HobyKing jet is from CMP. It will fly fine on either engine. The p-20 will be a little lighter when finished... but the thrust can be minimal once it's blowing down a jet pipe. And... if you mount it in the tail... you will have to add weight to the front to balance. (and it will be heavy again)

    I personally have a 90mm CMP t-45 with a wren 44 in it. My preference would be to put the wren into your L-39. It will take off fast, and it will easily get out of grass. (the P-20 may not get out of grass) In my T-45... I have taken the thrust down to 8#.
    Tony

  7. #4182
    Henke Torphammar's Avatar
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    RE: L39/Wren 44 Pics and video

    The Savex L39 is tail heavy even with the much lighter Kolibri T25 engine mounted in the tail and ALL electronics mounted up front in the nose cone. Center mounted Kolibri or MW44 would be good options. Lighter flies better even if it does pretty well loaded with a 17lb thrust Simjet 1200. The L59 from our all time favourite Hobbyking it insanely tailheavy. Even with a centermounted Kolibri it still needs alot of weight in the nose.

    Tail mounting the engine means your fuel will end up 100% on th CG(!)

    Pics and videos all come with a note on what's shown. Read carefully :-)

    Savex L39 + Simjet 1200 AUW ~14lb with wingtank.
    [youtube]http://www.youtube.com/watch?v=TlFM9-aL-Jc&list=UUkS76rnRPMEStILK5pfawfQ&index=13[/youtube]


    Savex L39 + Kolibri T25 rear mounted AUW ~7lb
    [youtube]http://www.youtube.com/watch?v=cmF1FMWqFzM[/youtube]

    Savex L39 + Kolibri T25, all electronics mounted on a plate all the way up front, even elevator servo.


    Savex L39 + Kolibri T25, empty hull as everything is up front


    Savex L39 + Kolibri T25, batteries all the way up front


    Savex L39 + Kolibri T25, adjustable engine mount in the tail.
    /Henke
    www.youtube.com/henke2
    Ready2fly Yak-130 "Mitten", Lambert Kolibri T35 - Пенопласт летчик-истребитель

  8. #4183

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    RE: L39/Wren 44 Pics and video

    Thank guy's

    Doc
    Will go the 44 for the L39 but dose it need some CF in it some wear extra, the wings I did do more work in side.

    Henke
    Nice pic's and a plus on your site for some MAGIC video's

    Cheer's and Thanx again.

    Croc....

  9. #4184
    Dr Honda's Avatar
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    RE: L39/Wren 44 Pics and video


    ORIGINAL: CrocEnd

    Thank guy's

    Doc
    Will go the 44 for the L39 but dose it need some CF in it some wear extra, the wings I did do more work in side.

    Henke
    Nice pic's and a plus on your site for some MAGIC video's

    Cheer's and Thanx again.

    Croc....

    It depends on how hard you want to fly it. My T-45 is basically stock. My only mods are to fit the turbine, and it's parts. I didn't change the bulkheads, or beef up the wing at all. BUT... I'm not a speed freak. Like I said... mine is turned down to 8#, and most of the flight is at half to 3/4 stick. If you want to see how fast you can go with a CMP kit.. you may want to pull the bottom wing covering, and give it some carbon fiber. As far as I know... the CMP kits don't have a real spar in them.

    But then again... the EDF guys push them hard, and I've never heard about a wing failure. (and big batteries are heavy)



    Yes... Henke does nice work. I always have good intentions for doing a super clean install... but then I just want to fly. (and it gets ugly)
    Tony

  10. #4185

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    RE: L39/Wren 44 Pics and video

    Another Q the Wren 44 Gold say's 27mm from tail cone to bell mouth can I have my exaust pipe out the back so as not to burn the A@@S end its the 420mm pipe

    Merry Xmas you Mob.

    PS will buy the the 600mm plus and cut if needed.

  11. #4186
    Dr Honda's Avatar
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    RE: L39/Wren 44 Pics and video

    I'm not exactly sure what you are asking.

    BUT........

    You need 25 to 30mm from the engine nozzle to the bell mouth.

    You also need about 10mm (as I recall) from the inside of the pipe ring... and 10mm inside the model. These two steps will create a vacuum draw in the model, and keep things cool. If you stick the pipe out of the model... you will overheat it.

    BUT... if yo have a hot start... yes, you can scorch the tail of the bird. But then again... if you are having hot starts... your engine won't last long.



    Tony

  12. #4187

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    RE: L39/Wren 44 Pics and video

    Thank you Dr Honda That pic tells a thousand words so keep pipe just inside the fuse. I have seen other pic's just not as good as that.

    even the mounting of the outer ring magic pic.

    Cheer's and merry christmas.

  13. #4188

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    RE: L39/Wren 44 Pics and video

    I also have HK BAE Hawk wing tip damaged in transit easy fix. have a HK Viper partly built but think it is heavy.

  14. #4189
    MJD's Avatar
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    RE: L39/Wren 44 Pics and video

    This thread is destined to live forever. But unlike some threads that mutate and devolve, this is a good thing - must be a great aircraft/engine combo.

    I just joined the club, I took delivery of my L-39 about a week ago and already have the Wren 44 Gold. This is my first turbine model, but I am used to small fast models so I'm not worried about the flying part, though I will hook up with a jet jockey for first flights. I got lazy in terms of hunting down alternate retracts, I ordered the Jet 1A set with it as well. $OUCH! But they sure are nicely made. Seem a little too sturdy for this aircraft but that's better than spindly I guess.

    I just redrew the engine mount on CAD and am about to cut that out and assemble. This thread is so darn long it is a science project just to wade through it and find the useful tidbits!

    Anyhow I am tickled with the airframe, very light and reminiscent of some of the Ukraine made composite models I've seen. I opted for the built-in wing tank, that eliminates the task of fitting and plumbing tanks, other than the air trap.

    Looking forward to putting this together over the winter. I've had the engine for three years, bench run it a few times just to get the adrenalin flowing, but bench runs are a poor substitute for flying - it was high time to get it in an aircraft.




    Sorry I'm late dear, I had to help my uncle Jack off his horse.

    Revver Bro #231

  15. #4190
    GrayUK's Avatar
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    RE: L39/Wren 44 Pics and video

    Welcome to the club
    Great model and turbine.
    I have just go in from flying today with my Hawk and Wren 44 Gold.
    Also there was a good friend who was flying the L39 Around in very windy conditions.
    Great model, you will enjoy.
    Keep us updated, i would be interested to hear how you get on with the wing tank.

    Paul G
    no one told you when to run...

  16. #4191
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    RE: L39/Wren 44 Pics and video

    It's a new and different project for me. After 40 years building FF/RC/CL glow sport models most problems are intuitive to solve, but with this there are new things to think about. While none of the fabrication required is much of a problem, I find I am at the starting block when it comes to the whys and hows.

    Based on the info I've harvested from this thread and whatnot I've come up with a partial servo list:

    Ailerons: HS5085 x 2
    Flaps: HS5085 x 2
    Rudder: TBD (in fin base, internal linkage, external..)
    Elevator: TBD (single regular servo with split pushrod? Internal linkage?)
    Nosewheel: HS85MG

    Air valves:
    Brakes: HS85
    Retract: HS85

    Rx battery: 2100mAh LiFe
    Rx: TBD
    Starter battery: hmm, not sure, but possible 2s 2100 LiPo if it gives enough rpm. Got a wishy washy answer about use of 2s and 3s with this system.
    Sorry I'm late dear, I had to help my uncle Jack off his horse.

    Revver Bro #231

  17. #4192
    Boomerang1's Avatar
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    RE: L39/Wren 44 Pics and video

    The Savex L39 still seems popular but the F-16 seems to be at a dead end.

    Is there a reason for this or is it considered just a bit too difficult compared to the L-39?
    I know the engine mount/undercarriage/wing mount is the complex heart of the F-16 wheres
    the L-39 is what I would call conventional.

    Is it up to me & my fixer-upper F-16 to revive it? - John.

  18. #4193

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    RE: L39/Wren 44 Pics and video

    I think if vaclav supplied a set of cnc formers for the f16 it would be far more popular.
    the whole engine support, gear formers, wing tube formers thing was a complete nightmare to construct..
    In fact i'm suprised that he still doesn't supply a set of formers for the l39 for the engine mount. I was lucky to have Yann make me an alu engine support that was absolutely perfect.

  19. #4194

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    RE: L39/Wren 44 Pics and video

    Look out you mob NEW YEAR coming.
    All the best for now.

    Later

  20. #4195
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    RE: L39/Wren 44 Pics and video

    These arn`t turbine L-39`s , but its a very cool video of 3 L-39`s flying in formation with FPV gear in them

    [youtube]http://www.youtube.com/watch?v=J8OtEoBXuxU[/youtube]
    Sonnich Johannesen

  21. #4196

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    RE: L39/Wren 44 Pics and video

    SJN

    Can't see nothing

  22. #4197

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    RE: L39/Wren 44 Pics and video

    Does anyone have an extra/spare/leftover wing for the Savex L-39? I need a complete wing in fair shape. Color scheme doesn't matter. Right wing is completely destroyed just outside of gear mount.
    Thanks.....


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