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  1. #251
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper


    ORIGINAL: cgroen

    Elevator:
    (No wood inside, sponge method used, and poured a lot of epoxy inside and inserted horns)
    Yes. You would think they could get the basics right. Some quality control would not go amiss. I just hope it fly's as well as the hype says. However, I haven't read a bad flying report.
    JET FLYING:- Resistance is futile. You will be assimilated.

  2. #252

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    RE: Another Skymaster Viper

    can someone put a picture of a turbine installation from the viper with and without bypass??

  3. #253
    CraigG's Avatar
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    RE: Another Skymaster Viper

    Well, here are a few without a bypass. I don't know of anyone who has done one with a bypass.
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  4. #254

    RE: Another Skymaster Viper

    Elevators finished, and the "U" shaped carbon plates for the maingear are glued (they are also part of the set from Digitech:
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    Carsten Groen

  5. #255

    RE: Another Skymaster Viper

    cable/tube:
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    Carsten Groen

  6. #256
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper


    ORIGINAL: cgroen

    cable/tube:
    I did not like feeding the servo wires close to the landing gear, so I fed them down the other side of the former. I may also feed the airlines the same way.

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    JET FLYING:- Resistance is futile. You will be assimilated.

  7. #257

    RE: Another Skymaster Viper

    Jascat,
    probably a better idea! However I was lazy
    I have around 5..6 mm clearance between the knee of the gear and the tube/cables, so I figured that was ok
    The tube/wires are fastened to the wall all the way, so they should stay there (hopefully) []
    Carsten Groen

  8. #258
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper

    Started fitting out the fuselage today. The front equipment tray is not much use, as the front cockpit tub almost reaches the top of it. I didn't fit it. I used the space for the three air tanks.
    I made up a new board & fitted it between the tanks & the fuse joiner. I shortened the rear cockpit tub by about half an inch, as it doesn't fit in the space provided between the tank & the fuse joiner. Still some work to finish off the equipment installation, but it's going well.

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    JET FLYING:- Resistance is futile. You will be assimilated.

  9. #259

    RE: Another Skymaster Viper

    Thanks for posting the pictures jascat, thats where I'm heading in a couple of days
    Finished the wings for now, no wood inside the flaps for the horns (well, there was a little block, but not much worth, the ailerons had some more, but it did not extend to the top skin!
    So sponge used again
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    Carsten Groen

  10. #260

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    RE: Another Skymaster Viper

    What does the sponge do?

    Chad

  11. #261

    RE: Another Skymaster Viper

    Chad,
    in post 241 you can hopefully see what I mean, I hope "sponge" is the right word for the material []
    As there are no wood inside for the horns, I simply insert some pieces of "sponge" inside to create a "cavity" where the horns will be sitting. This cavity is filled with epoxy, and the horns inserted. This will create a block of epoxy inside, "simulating" the wood that should have been there.
    The epoxy then has contact with the upper and lower skin and the spars inside.
    Only thing to careful about, is that there is enough glue inside, some of it will go into the sponge, so after a few minutes (before inserting the horns) I add some more, until I'm sure the cavity is completely filled.
    I hope this makes sense, I could have explained it much better in Danish, but that would probably not work very well
    Carsten Groen

  12. #262

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    RE: Another Skymaster Viper

    Carsten,

    Your english is almost better than mine. You explained it just fine.

    Thanks for the tip.

    Chad

  13. #263

    RE: Another Skymaster Viper

    Thanks Chad
    The trick is to make sure that the sponge is everywhere so the cavity is closed! I then use 30 min epoxy with Tix and microballons so it won't "run" too much inside, Hysol would obviously be a better alternative, but I have not changed to that yet []
    Carsten Groen

  14. #264

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    RE: Another Skymaster Viper


    ORIGINAL: cgroen

    Thanks Chad
    The trick is to make sure that the sponge is everywhere so the cavity is closed! I then use 30 min epoxy with Tix and microballons so it won't ''run'' too much inside, Hysol would obviously be a better alternative, but I have not changed to that yet []
    why dont you guys use some balsa and Hysol?
    insert some balsa and cover with hysol , then put it the horns?

    also Carsten "what happens in hedensted stays in hedensted"
    In God we trust , the rest we Track \"digitech multirotors\"

  15. #265

    RE: Another Skymaster Viper


    ORIGINAL: digitech


    ORIGINAL: cgroen

    Thanks Chad
    The trick is to make sure that the sponge is everywhere so the cavity is closed! I then use 30 min epoxy with Tix and microballons so it won't ''run'' too much inside, Hysol would obviously be a better alternative, but I have not changed to that yet []
    why dont you guys use some balsa and Hysol?
    insert some balsa and cover with hysol , then put it the horns?

    also Carsten ''what happens in hedensted stays in hedensted''

    You are right Sandor, the balsa would be the obvious, but I simply hate to make big holes in the surfaces to put enough wood inside to hold the double horns, and you know, with that big engine you sold me, I want to make sure the horns stay in the there
    Carsten Groen

  16. #266
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper


    ORIGINAL: cgroen

    Thanks for posting the pictures jascat, thats where I'm heading in a couple of days
    Finished the wings for now, no wood inside the flaps for the horns (well, there was a little block, but not much worth, the ailerons had some more, but it did not extend to the top skin!
    So sponge used again
    Carsten. The ball link between the two horns is good. What is not so good is the other end. It is not good to fit a ball link to one side of a servo arm. It puts lots of twisting forces on the servo arm & may couse flutter problems as well. Much better with a clevis at the servo end.
    Just my thoughts.

    Regards
    Jim
    JET FLYING:- Resistance is futile. You will be assimilated.

  17. #267

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    RE: Another Skymaster Viper


    ORIGINAL: Jascat100


    ORIGINAL: cgroen

    Thanks for posting the pictures jascat, thats where I'm heading in a couple of days
    Finished the wings for now, no wood inside the flaps for the horns (well, there was a little block, but not much worth, the ailerons had some more, but it did not extend to the top skin!
    So sponge used again
    Carsten. The ball link between the two horns is good. What is not so good is the other end. It is not good to fit a ball link to one side of a servo arm. It puts lots of twisting forces on the servo arm & may couse flutter problems as well. Much better with a clevis at the servo end.
    Just my thoughts.

    Regards
    Jim
    Hi Jim,

    I'd have to agree with you. Though that would mean you couldn't use the alu arms at the servo end.

    These look cool though:



    My kit went on the post today, so maybe I'll have something to do after the weekend
    Hans

  18. #268

    RE: Another Skymaster Viper

    Jim,
    I think you are right, but I'm not sure that it will be able to do any twisting, the alu arm is very thick and wide ?
    But, I will have a more experienced builder here look it over too, if it's no good, I will change it to clevises, thanks for the heads up !
    (I have used the same method before on other large scale planes, 2.7m comp arf pitts S12, Eurosport, comparf 2.6m extra 300, and never seen a problem)
    Carsten Groen

  19. #269
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper

    Hans. These look ideal for the purpose, as long as they are metal & not plastic.
    JET FLYING:- Resistance is futile. You will be assimilated.

  20. #270

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    RE: Another Skymaster Viper

    Hi Jim,

    they are carbon-reinforced plastic. (I think like the heavy-duty Hitec arms) I think I'm going to order some to get a feel for them.
    Otherwise I'll have to go for nylon arms and traditional clevises. Clevis + alu doesn't work for me.

    If anyone knows of a alu version of these please let us know

    @Carsten, I don't think the twisting of the arms is the problem when using the alu ones, but the load they pose on the output gear/bearing combination - although the ball at least is on the right side of the the arm.

    Nice (quick!) build - I havent even had a chance to start!!

  21. #271
    PaulD's Avatar
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    RE: Another Skymaster Viper

    I have seen and done many installations of alum arms with ball links with no problems whatsoever. The potential downsides of a worn fit between a relatively small clevis pin and the servo arm are worse IMO.

    My Viper should be on its way any day now. [8D]

    PaulD
    If it\'\'s too LOUD - You\'\'re too OLD

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  22. #272
    Duncan's Avatar
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    RE: Another Skymaster Viper

    I've had the phone call to say my Viper has landed Now i just need to figure out an excuse to get out of work to go and pick it up from Ali !!
    Aero-creative - Vinyl Design & Application
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  23. #273
    Selleri's Avatar
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    RE: Another Skymaster Viper

    Better just send it straight to me as you wont have time for it with all that baby stuff going on.

    Congrats btw!
    Sverrir G. - Icelandic Volcano Yeti

  24. #274

    RE: Another Skymaster Viper

    Got the cockpits adjusted so they fit.
    I will make the front one "semi permanent", and the aft will be removed for filling fuel/air and charging.
    I removed the two pins in the canopy, they were HUGE, and they got in the way for the front tub, I made two new pins at the edge of the canopy instead.
    Just need to make a cover for the front, the one that follows the kit is way too short, so will make a new one of some wood instead....

    BTW, I removed the brace in the front of the canopy, I added some epoxy around the inside of the curve in the front to make it more stiff.
    I also removed some of the brace in the back, it is very wide from the factory, no need for that (and it looks ugly )
    And no, it is not cyano fog or epoxy fingers, it's just dust on the glass
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    Carsten Groen

  25. #275

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    RE: Another Skymaster Viper


    ORIGINAL: Slam_Dunc

    I've had the phone call to say my Viper has landed Now i just need to figure out an excuse to get out of work to go and pick it up from Ali !!

    Dont you just love those calls



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