RE: Extreme Flight YAK 54  
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    • All Forums >> RC Airplanes >> 3D Flying! >> RE: Extreme Flight YAK 54
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    RE: Extreme Flight YAK 54 - 5/20/2004 12:47:33 PM   
    stomper


     

    Posts: 2249
    Joined: 12/13/2001
    From: Clayton, NC, USA
    Status: offline     		Thanks for the reports Jeff.
    Can't wait to get the time to put my plane together!
    What engine/prop are you using?

    _____________________________

    Doug

    (in reply to JWilliams)
           Post #: 126

    RE: Extreme Flight YAK 54 - 5/20/2004 1:35:10 PM   
    Matt Merciez



    Posts: 328
    Joined: 11/16/2003
    From: Suffolk, VA, USA
    Status: offline     		Jeff,

    The Yak manual has the recommended throws in degrees. I have a Great Planes throw meter but it only has the throw in inches or mm. Any chance you know what the recommended throws are in inches or mm?

    How much exponential are you using if any for the recommended rates and your 3D rates?

    My CG ended up being 5/8" behind the aft edge of the yellow Orakote over the wing tube. Will this be flyable or will I need to get the CG a little more forward?

    Thanks,

    _____________________________

    Matt Merciez

    (in reply to stomper)
           Post #: 127

    RE: Extreme Flight YAK 54 - 5/20/2004 3:20:50 PM   
    Spaceclam



    Posts: 4640
    Joined: 4/13/2003
    From: chatsworth, CA, USA
    Status: offline     		i would venture to say that the best 3d rates are the most you can get out of it.
    Update: engine installed. canopy prepared and can be mounted but i need a new onboard ignition system first before i hook anything up. i also need a reversing y harness for the elevators because if i use channel 5, it unconditionally goes to the gear swieth and opperates from it. if i use 6, 7, or 8 for it, it will go onto a trim pot and i cant get it off. so i will be using every channel, so becasue of those things i can not get anything else done. i have the main wheels mounted, i think i will skip the wheelpants, maybe. it looks like there is a little bit of toe in on the main gears. they appear to be equal. it this intentional or does it just look that way becasue the fuselage tapers?

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    Duct tape is like the force. It has a light side, a Dark side, and it holds the universe together.

    (in reply to Matt Merciez)
           Post #: 128

    RE: Extreme Flight YAK 54 - 5/20/2004 3:28:58 PM   
    akflyer



    Posts: 584
    Joined: 1/24/2002
    From: Soldotna, AK, USA
    Status: offline     		Clam, What radio are you using ?? If you have 8 channels you should be able to mix in the elevator with out using a reversing "Y".

    (in reply to Spaceclam)
           Post #: 129

    RE: Extreme Flight YAK 54 - 5/20/2004 3:41:09 PM   
    Matt Merciez



    Posts: 328
    Joined: 11/16/2003
    From: Suffolk, VA, USA
    Status: offline
    quote:

    ORIGINAL: Spaceclam

    i would venture to say that the best 3d rates are the most you can get out of it.



    I would definately agree with you on the 3d rates. My concern was with the normal flying rates. Currently I have the low rates set to about 50% of the 3D rates which should be close but I just wanted to bounce that off some numbers I could actually measure.

    I did install the wheel pants and don't recall them giving the appearance of havinga tow-in condition, but I don't recall really looking straight on to see if that was present.

    I was able to setup my radio similar to what akflyer suggested in that I used a mix for the elevator - gear. The cool thing about my radio (jr xp 6102) is it is only a six channel radio and I have the ailerons and elevators wired without using a y-harness.

    _____________________________

    Matt Merciez

    (in reply to Spaceclam)
           Post #: 130

    RE: Extreme Flight YAK 54 - 5/20/2004 10:16:35 PM   
    Matt Merciez



    Posts: 328
    Joined: 11/16/2003
    From: Suffolk, VA, USA
    Status: offline     		No flying anytime soon!. Fortunately the YS rep said it will take about 6 days for a turnaround. The motor was running for about 60 seconds when it died. If you look closely at the picutre below you will see what some might consider a problem



    < Message edited by merciez -- 5/20/2004 5:17:02 PM >

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    Matt Merciez

    (in reply to Matt Merciez)
           Post #: 131

    RE: Extreme Flight YAK 54 - 5/20/2004 11:07:45 PM   
    stomper


     

    Posts: 2249
    Joined: 12/13/2001
    From: Clayton, NC, USA
    Status: offline     		Ouch!
    Sorry to see that.
    How much run time do you have on it?

    _____________________________

    Doug

    (in reply to Matt Merciez)
           Post #: 132

    RE: Extreme Flight YAK 54 - 5/20/2004 11:34:18 PM   
    akflyer



    Posts: 584
    Joined: 1/24/2002
    From: Soldotna, AK, USA
    Status: offline     		Nothin a little bubble gum and JB weld wont fix lol... That sucks... Was it too lean ??? Did the piston seize in the sleeve ? Any idea why the jug decided it did not want to be company with the crank case ??

    (in reply to stomper)
           Post #: 133

    RE: Extreme Flight YAK 54 - 5/21/2004 12:38:18 AM   
    Matt Merciez



    Posts: 328
    Joined: 11/16/2003
    From: Suffolk, VA, USA
    Status: offline     		The engine ran for maybe 2 minutes (total run time). This was the initial engine start to attempt to set the needle valves for the maiden flight. The engine started quite easily per the manufacturers instructions. Running 20/20 coolpower with a 16 x 6 apc prop. Only thing touched for engine settings was the high speed needle valve and that was set to two turns open.

    I had slowly increased power after about 30 seconds to allow tank pressure to build up when I opened the high speed needle valve two clicks just to verify engine response with the needle valve. The motor slowed suddenly and stopped running, giving me the appearance it was a very sensitive motor and it was too rich and needed to alteast go back to its original setting of 2 turns open. Before restarting I had heard what sounded like pressure leaking out from the engine area and I thought it was attributed to a leaking fuel line but close inspection of the fuel like indicated it was fine. I did not notice the cracked head at this time and was able to start the engine again, but this time it sounded off and only ran for maybe 20 seconds, so I thought it must be a leak on the fuel tank side causing it to run so poorly.

    It was on the second inspection of the fuel and exhaust lines I noticed the cracked head. I now believe it was simply a timing coincidence of it dying the first time with me making a small needle valve adjustment. It died the first time because it was when the head failed. Running the engine the second time just made the crack worse.

    The YS tech rep was very friendly and said that it was very rare for this to happen and to send the motor back for repairs which is what I am doing. Hopefully they will be able to figure out what was wrong.

    < Message edited by merciez -- 5/20/2004 7:42:52 PM >

    _____________________________

    Matt Merciez

    (in reply to akflyer)
           Post #: 134

    RE: Extreme Flight YAK 54 - 5/21/2004 3:09:07 AM   
    Spaceclam



    Posts: 4640
    Joined: 4/13/2003
    From: chatsworth, CA, USA
    Status: offline     		i know i can set it up without a y harness, but unfortunatly, channels 5,7,8 are on trim pots and i can not get them off. that is great for gyro and flaps/spolers but it does not help me any here. so i want it to be on a y harness also so that i will have an extra channel available in case i want to put a smoke system on it (those little powder stick ones) if i want to or some other funky system. maybe a siren or something

    _____________________________

    Duct tape is like the force. It has a light side, a Dark side, and it holds the universe together.

    (in reply to Matt Merciez)
           Post #: 135

    RE: Extreme Flight YAK 54 - 5/21/2004 3:48:58 AM   
    birdnest


     

    Posts: 190
    Joined: 7/7/2002
    From: reading, PA, USA
    Status: offline     		At least with a futaba 8 you can turn off a trim knob by using a P mix and mixing the channel with itself, something like channel6-->channel6 +100/-100 something like that, if you're interested I'll grab the book and double check it.

    Peter

    (in reply to Spaceclam)
           Post #: 136

    RE: Extreme Flight YAK 54 - 5/21/2004 3:52:22 AM   
    Spaceclam



    Posts: 4640
    Joined: 4/13/2003
    From: chatsworth, CA, USA
    Status: offline     		yeah, i know. you can also decrease the value of a travel by mixing a channel onto itself with a negative value. ther are all kinds of different things you can do but i want to see how many p-mixes i will need first. however, could you check it for me please? i had the book for a short period but i had to give it back to my friend

    _____________________________

    Duct tape is like the force. It has a light side, a Dark side, and it holds the universe together.

    (in reply to birdnest)
           Post #: 137

    RE: Extreme Flight YAK 54 - 5/21/2004 4:04:04 AM   
    birdnest


     

    Posts: 190
    Joined: 7/7/2002
    From: reading, PA, USA
    Status: offline     		To disable channel 7 knob:
    turn on a P mix
    master=channel 7
    slave=channel 7
    mixing values: -100% -100%

    thats it.

    Peter

    (in reply to Spaceclam)