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  1. #101
    DiscoWings's Avatar
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    hyradulic retracts are more trouble then they are worth, you need to find high pressure line like stiff nylon that can sustain 300-500 psi, and then you need to find a strong enough motor to drive it, a turbine pump WILL NOT CUT IT they run at 40 PSI at best.
    \"Hi,You are 100% correct but are also 100% wrong... \"
    - rcflip

  2. #102
    ww2birds's Avatar
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    Anton can confirm but I'd assume the hydraulic nose steering is "passive" .. meaning it has no pump, just a master and slave cylinder and you move the master with a servo, the hydraulics are just used to transmit the force to the steerable part of the nose gear. Presumably this is attractive when you don't want to move the entire strut as we usually do with a servo or cables at the top of the strut.

    Regarding turbine pumps, I've seen pressure measurements way above 40psi on manufacturer test stands (more like 80-90) with the gear pumps used for turbines. I think if you go look at the excellent tread on hydraulic landing gear you'll see a confirmation of this plus some really nice setups. See: Hydraulic Retracts

    Dave

  3. #103
    MNModels's Avatar
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    Hi,

    I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
    Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....

    Regards
    MNModels
    Skymaster & Xtremejets

  4. #104
    muzzgail's Avatar
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    Quote Originally Posted by MNModels View Post
    These two designs will be followed by another fist for RC soon to be released....
    Is it a Secret Morne??
    Murray
    Carf Ultra Flash, SM F-14, TF GS Corsair, TF GS P47, Boomerang Sprint, Carf Euro

  5. #105
    MNModels's Avatar
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    Hi,

    At this stage..yes. Under testing. It will be option available to all Skymaster jets, old and new....

    Rgds
    MNModels
    Skymaster & Xtremejets

  6. #106

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    My guess is hydraulic braking system just using master cylinder. That would give more direct braking response than an air operated system.

  7. #107

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    Quote Originally Posted by DiscoWings View Post
    hyradulic retracts are more trouble then they are worth, you need to find high pressure line like stiff nylon that can sustain 300-500 psi, and then you need to find a strong enough motor to drive it, a turbine pump WILL NOT CUT IT they run at 40 PSI at best.
    Can you elaborate on when these have been a problem for you?
    Team Elite Aerosport

  8. #108

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    Quote Originally Posted by MNModels View Post
    Hi,

    I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
    Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....

    Regards
    i really like the air/hydraulic system in the 104. Genius! Looking forward to new developments with the F-16.
    Team Elite Aerosport

  9. #109
    DiscoWings's Avatar
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    Quote Originally Posted by dubd View Post
    Can you elaborate on when these have been a problem for you?
    the 2 experiments I tried simply required way more pressure than air, also polyureathane tubing would burst. Unless you are dealing with small retracts, we are talking about 20lb plane hydraulics will give you a lot of problems.

    You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
    \"Hi,You are 100% correct but are also 100% wrong... \"
    - rcflip

  10. #110

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    good idea for the install the all lights for F16! we will offer the lights install at factory soon!
    owner - Skymaster Jet
    X-Treme Jets

  11. #111
    FalconWings's Avatar
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    Quote Originally Posted by DiscoWings View Post
    the 2 experiments I tried simply required way more pressure than air, also polyureathane tubing would burst. Unless you are dealing with small retracts, we are talking about 20lb plane hydraulics will give you a lot of problems.

    You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
    Agree with Disco here. Hydraulics are not meant for small scale tasks. Ask the CARF A-4 and Mig-29 owners. The lines eventually soften and deform, theres always risk of leaks. If at all I would prefere and air system with a good safety switch.
    The path forward is all electric gear, period! (even for full scale )
    Buying Jet Legend? Read here: http://www.rcuniverse.com/forum/m_11372496/mpage_1/key_/tm.htm

  12. #112
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    Quote Originally Posted by FalconWings View Post
    Agree with Disco here. Hydraulics are not meant for small scale tasks. Ask the CARF A-4 and Mig-29 owners. The lines eventually soften and deform, theres always risk of leaks. If at all I would prefere and air system with a good safety switch.
    The path forward is all electric gear, period! (even for full scale )

    Absolutely agree! No matter what its STILL oil in lines that will weaken over time. Im sorry but no hydraulic system on the planet will stay leak free forever. And with a closed system like a jet...its way too much risk and a PITA if you get a leak. Add in small scale and that risk factor goes up 10x. I dont want oil of any kind running through my jet unless its turbine oil being pushed at way less PSI than something hydraulic.

  13. #113
    DiscoWings's Avatar
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    Quote Originally Posted by pilot tw View Post
    good idea for the install the all lights for F16! we will offer the lights install at factory soon!

    yay lights!
    \"Hi,You are 100% correct but are also 100% wrong... \"
    - rcflip

  14. #114

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    Quote Originally Posted by dubd View Post
    i really like the air/hydraulic system in the 104. Genius! Looking forward to new developments with the F-16.
    You still planning on bringing the 104 to BITW D?

  15. #115

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    Quote Originally Posted by smaze17 View Post
    You still planning on bringing the 104 to BITW D?
    I will if I get through the checkout flights before BITW.
    Team Elite Aerosport

  16. #116
    TJPro351's Avatar
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    Anybody have one of these ready to fly yet? Any new updates?

  17. #117

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    Hi, we starting test the F-16 1/5 in Taiwan, and we still waiting the scale LG for the F-16 1/5, the scale LG will finish on Sep , i will post more pictures and test flight video here,


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    owner - Skymaster Jet
    X-Treme Jets

  18. #118
    TJPro351's Avatar
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    Quote Originally Posted by pilot tw View Post
    Hi, we starting test the F-16 1/5 in Taiwan, and we still waiting the scale LG for the F-16 1/5, the scale LG will finish on Sep , i will post more pictures and test flight video here,


    Click image for larger version. 

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    Thanks Anton, looking forward to see the pictures and the video

  19. #119

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    Quote Originally Posted by pilot tw View Post
    Hi, we starting test the F-16 1/5 in Taiwan, and we still waiting the scale LG for the F-16 1/5, the scale LG will finish on Sep , i will post more pictures and test flight video here,


    Click image for larger version. 

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    Looks Great! Cant wait to see some video of it in action!

  20. #120

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    the F16 1/5 test flight on begin of this month, we had 6 landing , but no camera man , sorry, I will back Taiwan for test it again on next week, i hope that good weather on next week,

    here are some pictures for the speed brake done!




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    Last edited by pilot tw; 08-25-2014 at 09:58 AM.
    owner - Skymaster Jet
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  21. #121

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    Speed brakes look great! Keep us updated on the progress! Its going to be a nice airframe! :-)

  22. #122

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    new color scheme for F-16 1/5,

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  23. #123
    AndyAndrews's Avatar
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    Maybe they can fix the stance. Most of the SM F-16 look like their tail is dragging. But I liked the ones I owned. I bet the gear price will drop when folks don't pay it.
    The bitter taste of poor quality lingers long after the sweet taste of low price is forgotten.

  24. #124

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    Slat with Flap

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  25. #125

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    intake!

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