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  1. #1601

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    RE: Another Skymaster Viper

    Hi Rainer

    Sorry for the trouble.We already checked out you got the wrong nose retract.We already asked our supplier Mr. Li Kai to send new nose retract.Please send your address and phone number information to us via e-mail.Meanwhile,please disassemble the current nose retract and sedn back to Mr. Li Kai.I sent Mr. Li's address to you.Please check your mail.

    Best regards

    John
    Skymaster Jet

  2. #1602
    3DAV8R's Avatar
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    RE: Another Skymaster Viper

    Rudder Question:

    I know that some of you have supported the hinges with brass tubing, Duncan I believe. Take a look a what I'm thinking of and let me know what you think. The brass tube will be notched before being inserted into the fin. Also, do you think any square supports will be needed on the fin where the hinge point will go in ? Any suggestions/help will be fantastic.

    Steve
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    Cash, VISA, MC, AMEX, what ever it takes !

  3. #1603
    ww2birds's Avatar
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    RE: Another Skymaster Viper

    I have done that technique before with some warbirds having similar control surface geometry. It is a nice way to support the exposed part of the shaft that sticks out.

    You can also use the Robart hinge point pockets to achieve the same effect, the advantage there is that the rudder surface is removable .. a nice bonus. But this is good thinking on your part...

    See: http://www.robart.com/store/control-hinges?page=1

    Dave

  4. #1604
    Selleri's Avatar
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    RE: Another Skymaster Viper

    Mine looked something like this and held up in all my flights.



    Sverrir G. - Icelandic Volcano Yeti

  5. #1605
    3DAV8R's Avatar
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    RE: Another Skymaster Viper

    Looks like you put just a small flare at the end of the tube to get it a bit closer to the pivot point, great idea, just what I had in mind.

    Steve
    Cash, VISA, MC, AMEX, what ever it takes !

  6. #1606
    Selleri's Avatar
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    RE: Another Skymaster Viper

    Yes, worked very well.

    Sverrir G. - Icelandic Volcano Yeti

  7. #1607
    Duncan's Avatar
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    RE: Another Skymaster Viper

    Steve, just square off one end as mentioned and they will be perfect. I roughed up the brass to give the hysol something to key into.

    Cheers

    Duncan
    Aero-creative - Vinyl Design & Application
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  8. #1608
    3DAV8R's Avatar
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    RE: Another Skymaster Viper

    Selleri, Duncan, thank you for the info on the hinges. Duncan, I used your idea on the ram's for the main gear doors, big difference. I now have very good mechanical advantage on the doors, I also did something similar on the nose gear door. I will post a few pics soon. Thanks again.

    Steve
    Cash, VISA, MC, AMEX, what ever it takes !

  9. #1609
    3DAV8R's Avatar
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    RE: Another Skymaster Viper

    Has anybody found that they had to relieve the underside of the wing skin so as to get a bit more aileron throw ? (down aileron)

    Steve
    Cash, VISA, MC, AMEX, what ever it takes !

  10. #1610
    Selleri's Avatar
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    RE: Another Skymaster Viper

    Steve check the counterbalance and the paint line(were the paint stops on the vipers) had minor conflicts there with mine but not on the wingskin.
    Sverrir G. - Icelandic Volcano Yeti

  11. #1611
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper

    After losing my first large Viper to some electric power lines a while back, I got the offer of another unbuilt early version kit. Maidened it today. I had forgotten how relaxing it was to fly. I dialled in quarter inch of crow. It is amazing how slow it will land. Using a Wren 160. Dry weight is 39Lbs.
    Must try to take better care of this one.
    JET FLYING:- Resistance is futile. You will be assimilated.

  12. #1612

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    RE: Another Skymaster Viper

    I am just finishing setting up my large Viperejet and have run into a problem with the retracts.

    When the wheel are down, the air pressure is very slowly decreasing, so there must be a small leak.
    However when the wheels are in the up position, the air pressure drops very quickly, so there is quite a large leak.

    Ideas please on how to find the leak/s and fix it, if it is in the cylinders on the wheels how do I stop them leaking?

    Thanks

    Ross

  13. #1613
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    RE: Another Skymaster Viper

    Mate,

    Take a pair of pinchers and bloke one airline at one point at a time. Obviously you only need to concentrate, either on the up or the down side of the system at a time. However, don't forget to check the filler line too. Once you've isolated the leaking component, you can then set out to solve the problem.

    But, don't be surprised to find more than one leak.................

    Cheers

    Jan
    It is always pilot error.

  14. #1614

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    RE: Another Skymaster Viper

    Jan,
    Thanks for the comments, yes I have tried that it is in the up part of the left wing retract.
    Now how do I fix the leak in that cylinder.

    Thanks
    Ross

    Queensland, isn't that where NFL players like dogs????

  15. #1615
    Springbok Flyer's Avatar
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    RE: Another Skymaster Viper

    Mate,

    If you know it is a cylinder that leak, just replace it.

    Cheers

    Jan
    It is always pilot error.

  16. #1616
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    RE: Another Skymaster Viper

    The nose cylinder leaked on my viper. I used a syringe to put some BVM lube into the cylinder and worked it in and out for a while. It seemed to bed the o ring in and fixed the leak.

    Duncan
    Aero-creative - Vinyl Design & Application
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  17. #1617
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    RE: Another Skymaster Viper

    Same problem here. but as I donΒ΄t like pneumatics I simply got rid of of them and installed servos for actuating the gear doors. Pity this this was a pro version, with the pistons installed... oh fezes.


    Enrique

  18. #1618
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper

    ORIGINAL: erbroens

    Same problem here. but as I donΒ΄t like pneumatics I simply got rid of of them and installed servos for actuating the gear doors. Pity this this was a pro version, with the pistons installed... oh fezes.


    Enrique
    I think it is the retract cylinder that is giving problems, not a gear door cylinder.
    Solution is to inject some silicon grease into the cylinder, work it back & forth, then leave it overnight & if that doesn't work, strip down the cylinder, check the O ring for damage & replace it with a new one from a hydraulics shop.
    JET FLYING:- Resistance is futile. You will be assimilated.

  19. #1619
    erbroens's Avatar
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    RE: Another Skymaster Viper

    Ok, thanks.

    I tried this already but even so two of three gear door cilinders didnΒ΄t worked as required and jammed the gear during the test.

    It was faster to put the servos rather than waiting new pistons from China!


  20. #1620
    Jim Cattanach's Avatar
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    RE: Another Skymaster Viper


    ORIGINAL: zl1wn

    Jan,
    Thanks for the comments, yes I have tried that it is in the up part of the left wing retract.
    Now how do I fix the leak in that cylinder.

    Thanks
    Ross

    Queensland, isn't that where NFL players like dogs????
    My last answer was for your problem.
    JET FLYING:- Resistance is futile. You will be assimilated.

  21. #1621
    3DAV8R's Avatar
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    RE: Another Skymaster Viper

    Quick CG question: In the instructions it mentions 220mm-250mm from the leading edge at the root. 1st, Leading edge at the root I would assume is where the wing panel joins the fuselage, aft from that point? 2ed, what CG has everybody found that works well?

    Thanks, Steve
    Cash, VISA, MC, AMEX, what ever it takes !

  22. #1622

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    RE: Another Skymaster Viper

    I've got it balanced on the wing-tube, nose slightly down.

    (Easy to balance as well, just slide the wings off a bit and loop a string around the wingtube)

  23. #1623

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    RE: Another Skymaster Viper

    Hey guys,

    WHats the recommended CG for the SM big viper ? the manual calls for 220-250mm..

    thanks.
    www.liorzahavi.com
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  24. #1624

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    RE: Another Skymaster Viper

    Im about to maiden my buddy's large SM viper with 160SX. throws are per the manual and CG at about 225mm.

    Any special tips or do's and dont's for the maiden ?
    Thanks.
    www.liorzahavi.com
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  25. #1625
    Duncan's Avatar
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    RE: Another Skymaster Viper

    I'm pretty sure the aileron throws where on the low side as per the manual . Rudder needs increasing to 65mm each way as well.
    Aero-creative - Vinyl Design & Application
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