HobbyKing Prime Jet

Discussion in 'Scratchbuilding!' started by JettaManDan, Dec 2, 2018.

  1. JettaManDan

    JettaManDan Administrator

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    What up everyone! Been a long time since i posted a build thread. This year has been a crazy one for me...bought a house and moved...started a new job....kid started school....and more! So unfortunately flying and building took a back seat this season. Except for some Tiny Whoop stuff in my new shop...and some R/C trucks here and there...i put ZERO planes in the air this summer. Sad!

    Soooo....that will change. Gotta wait for it to be warm again, but as usual Black Friday rolled around and i jumped on some deals. One of them was this plane. The HobbyKing Prime Jet. The sale on it was hard to resist - $15 - and in stock in the US Warehouse. Combined with some other stuff i got it pretty quick. FED50H also got one..and we got together yesterday to build them both. 3 hours was all it took to build both planes. And we could have gone faster.

    So here are some build pics.

    Box lol
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    parts...
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    packaged ok..flat package...not much stuff inside to protect it..but both of ours showed up in good shape.

    wing/fuse is in 2 pieces but was connected to lay out and glue up flat...
    20181201_092421-1280x720.jpg
    then add the carbon..they give you nice 3mm strips for the wing and canards..and then a 3mm tube for extra strength...
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    then the translated instructions tell you to build the upper canopy and sides off the plane. But you really cant do that (no way to slide them over unless you cut pieces apart)..so we slid the side pieces on and glued them down.
    20181201_101153-1280x720.jpg
    We then added the top strip...and you then cut the canopy off (its scored well for this)
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    a pic of FED50's in progress...
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    next was motor and ESC...they give you a motor plate that fits well. But isn't braced really at all. So we both added a 2nd piece of foam inside the back of the fuse to brace it more. You can see it in the middle of the mount. Could use more but that was all i did.
    20181201_113121-1280x720.jpg

    then ran the RX to see if the motor worked. ESC is on the bottom. I ran a batt extension to get it up into the top of the fuse. They pre-cut a hole for it. Nice!
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    we then added the servos. They give you very nice control horns and the slider rod holders for the servos. I used 2-56 rods for mine though they give you ones to use. The 2-56 is tighter. Then they give you a carbon tube to slide through behind the canopy and use rubber bands to secure. You aren't supposed to cut the whole canopy off (realized this later) so i just added a foam tongue under the front of the canopy to hold it down. Works fine. Run the servo wires and button up the top and bottom plates and you are done. This was a very simple and straight forward build. If you've built an RCP or FRC jet this will be simple.

    Couple of done pics...and i have a 800 RadJet i got last year..and this looked real close to that..so you can see the comparison.

    20181201_124217-1280x720.jpg 20181201_124209-1280x720.jpg 20181201_124229-1280x720.jpg 20181201_124459-1280x720.jpg
    and the RadJet for comparison.

    20181201_124253-1280x720.jpg
    I got busy today so i couldn't fly mine. FED50H did however have the chance and said it flew awesome! Just doesn't glide at all and drops out of the sky when you cut the power lol. So maybe not a 100% Novice plane....but he was impressed with the performance. I did a 2212-2200kv motor and a 6x4. He did a 2700kv and a 5 blade prop. His video will be up soon. Pretty decent kit. Worth $15 for sure!

    Dan
     
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  2. FED50H

    FED50H Administrator

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    Great build post. It's always fun to build with other pilots/builders. Everyone has a little different idea on how to achieve the same result...I ended having to trim my verticals, as I placed my servos differently...neither of us put them in the way plane was cut. I used plain blocks to support the motor mount and had to add a bottom fin to protect my prop, since it can't swing out of the way in landing. Today was a crap day to test fly, but I got out there anyway. In apologize in advance for the dreary window...but the plane flies well and is well worth the sale price. Mine does not glide...I cut throttle and it just stops...it didn't nose up or down....just falls...as with all pushers (motor behind the control surfaces) it requires speed to maintain control...

     
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  3. JettaManDan

    JettaManDan Administrator

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    glad u got a flight already on it....i still haven't flown my radjet...(6 months now lol)

    we will get them both flying at some point.
     
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  4. Grantman

    Grantman Top Gun

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    Dan, you and I have been living nearly parallel lives. I spent the summer moving my family 600 km away and the nine weeks thereafter fixing my old place and waiting for it to sell. Good part is I can see my new club field from my backyard and I have been able to fly there once so far :D
     
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  5. JettaManDan

    JettaManDan Administrator

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    Well...dont be mad...i moved about .5km away lol. Just 5 streets down hahaha. But heat of the summer move.

    Unfortunately im losing my flying field here shortly. Gotta find another go-to location.
     
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  6. Sterling101

    Sterling101 Top Gun

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    I bought one of these in the summer sale too - cracking buy for the money!

    Run mine on a 2700kv quad motor and 5x3x3 prop. Has plenty of punch on 3S and is stupid on 4S :D

    Also makes a great platform for a camera plane as it's surprisingly stable on 3S but like you say be careful when you lose air speed as it does tend to "drop" quite well once it slows down. Doesn't really stall, just falls out of the sky!

    I found I had to double up the wing plate on mine with some extra foam as I was getting wing flutter at high speeds but it was a simple fix. One sheet under each wing the same shape as the wing plate then shaped the leading edges to form a cleaner edge and haven't had a problem since :)
     
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  7. FED50H

    FED50H Administrator

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    I don't plan on going above the 3s but if I see wing flutter I will address it with your solution. It is odd that without speed it just falls....when I'm tired of it, I may start adding thin sheets to the top and bottom to create an "airfoil" and see if that helps...
     
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  8. JettaManDan

    JettaManDan Administrator

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    We need to fly my radjet to see the difference...essentially the same plane but with and airfoil wing....
     
    Sterling101, Wildthing and FED50H like this.
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