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  • #1 by sh0wtime on 12 Sep 2017
  • Hi guys.
    as i already have 3 5 inch quads i';m really temped (mainly by the cuteness factor) to build a 3 or 4 inch quad.
    i';ve read in a couple of threads that they can be a tad heavy & unresponsive though due to using similar parts to a 5 inch buld but just smaller props with less thrust.  :shrug:

    i guess that would make sense though, basically the same but with shorter arms & less thrust  :hmm:

    i';d like something pretty lively tbh.

    any recomendations? i quite like the look of the Japalura & Leopards but if something without the alloy would be night & day different & happy to be steered in that direction  ~~
  • #2 by hoverfly on 12 Sep 2017
  • Hells bells i woulden';t chop 4 ins of mine for anything...... ::) (old ones are the best and someone had to do it) :rolleyes:
  • #3 by Saleem on 12 Sep 2017
  • I fly 150,diatone lizard,spadger,i have a lantian 130 and have just built a 145 geprc sparrow although i got to maiden it yet.all running 3" and different motors,racestar 1407,tornado 1407 and emax 1306,they all run realy fast on dinogy 800 4s.this latest build,geprc sparrow i have fitted tornado 1608,it will run dys 3030 tris!

    I build a geprc leopard,195,its got red bottom 2205 and can only run 4" but on some tarot its slow.i dont know if its judt the batteries are tired but i got to try different props or something,maybe batterys need replacing,lots of trouble shooting on that frame.

    So if you got any doubts with a small 150ish 3" dont!

    If you use a aio fc and good motors they are fast as hell! Take it from someone who runs small 3" set ups.
     :smiley:
  • #4 by Slobberdog57 on 12 Sep 2017
  • I';m running a 160mm 4" with 1407 brotherhobby 3600kv spedix 20a, BFf3 Runcam mini and vtx03 and tj4045x3 props

    and its rapid, has quicker climb out than my 5" builds and can do 4mins on an 850 4s,

    3" I run a 120mm frame with xrotor 1105b 6500kv motors, 6a bullet esc';s piko blx clone Runcam micro and vtx03 using gemfan 3025 t style props, powered by a 500mah 2s, and at just over 100g in weight its a great flyer, that you can chuck in the air anywhere and cover good ground quick.

    tech has moved on so much lately that light small builds are the way to go,

    even my 2" on 1103 can haul ass, and give me a big grin.
  • #5 by Hozza on 12 Sep 2017
  • Have a read of this post by Cheredanine http://www.multi-rotor.co.uk/index.php?topic=22014.0

    I';ve built almost a carbon copy and it';s fantastic, I also had a Japalura 3inch which was about 65g heavier but can';t give a real comparison as it only lasted 2 lipos :-/
  • #6 by sh0wtime on 12 Sep 2017
  • Have a read of this post by Cheredanine http://www.multi-rotor.co.uk/index.php?topic=22014.0

    I';ve built almost a carbon copy and it';s fantastic, I also had a Japalura 3inch which was about 65g heavier but can';t give a real comparison as it only lasted 2 lipos :-/

    wow 65g! thats quite a bit on something light.

    maybe i need to be looking at the all carbon frames  :azn
  • #7 by Cheredanine on 12 Sep 2017
  • As per Hozza, the second air ro build I did he linked to is outstanding.

    I usually take two quads to the field in case of problems, on two seperate occasions I have taken that quad and good 5 inch racer (for reference my scx200 redback and recent shrike build).
    On both occasions I preferred the air-ro,
    It is somewhere between the two on top end but it';s agility is massively better, it changes direction on a dime, when you switch back and forth between it and one of the 5 inch quads, the 5 inch feel like a bus in a corner.

    It is just hands down the best quad to fly I have.

    For more tame flying it takes 3s very well, in fact I happily fly acro on 3s quite often, honestly can';t recomend it enough
  • #8 by sh0wtime on 12 Sep 2017
  • Sounds like it';s a go then, definitely worth adding to my small but growing collection.

    i have an SCX to build (redback) here that i might put on hold for a littlun  :cool:
  • #9 by Bajadre on 12 Sep 2017
  • go for it matey  ~~ bought a 4" not long ago a lot faster and twitchy than my docile 5" 280mm.
    tried 4s on it bit too fast for me atm lol  :laugh:
  • #10 by sh0wtime on 13 Sep 2017
  • Have a read of this post by Cheredanine http://www.multi-rotor.co.uk/index.php?topic=22014.0

    I';ve built almost a carbon copy and it';s fantastic, I also had a Japalura 3inch which was about 65g heavier but can';t give a real comparison as it only lasted 2 lipos :-/

    looks like there might be another one of these being built very shortly  :whistling:
  • #11 by AJ564 on 31 Oct 2017
  • Would this be too small to fly LOS?
    If it would be ok, can anyone suggest alternative flight stack components to miss out the VTX?
    Sorry if it's a bit of a newbie question
  • #12 by Cheredanine on 31 Oct 2017
  • Would this be too small to fly LOS?
    If it would be ok, can anyone suggest alternative flight stack components to miss out the VTX?
    Sorry if it's a bit of a newbie question
    You can fly it los, I think hoverfly may have.
    If you wild acro you are gonna want to put a custom mix in to compensate for the stretched x layout.

    You can buy he stack without the vtx.
    I have one built using raceflight millivolt and spark. Equally as good
    It also has mounting holes for a full sized flight controller/esc stack, although that would add weight but if you are not using fpv kit then you will save weight there
  • #13 by hoverfly on 31 Oct 2017
  • I flew my  Air Rio Kinetic l.o.s.  for test flights, at about 30 MTR it gets hard to orientate, a tail /head light would help but really its a f.p.v. ship.
    I'm flying  on 3 cells at present because I'm a whimp, I did try 4 cell but it goes ballistic. :laugh:
    I'm not really a racer ,my main interest is aerial photography , however it has got under the skin.
    I built the Kinetic after following  Cheredanine's build, he hasn't been forgiven yet. :laugh: I need a bigger flying site to really get into it,my local is ploughed up at the moment,its OK for planks and wings but I don't fancy stomping around in the mud looking for a downed  racer. :laugh:
  • #14 by AJ564 on 31 Oct 2017
  • Seems LOS might be a bit of a stretch then.
    Never mind.....  back to the drawing board!
    Thanks for the info about the flight stack Cheredanine - most helpful
    Hoverfly - I notice from your sig that you use a Spektrum DX8. Which receivers do you use in these small quads?
    Thanks all.
    Andy
  • #15 by hoverfly on 01 Nov 2017
  • The dx8 was used with a knob conversion to use as a mode switch for A.P.M.  f/c.  I'm now using a dx9 as main  t/x as i fly gliders and need lots of extra channels for brakes /camera control/ and other gubbins. It also has a diversity antennas.
    For mini quads i  use Lemon satellite receivers, cheap and haven't had one fail yet..  :crossfingers:
    I have also used some spektrum dsm 2 sats  that have been removed from old retired planks.


    Don't give up the idea, if your eyesight is ok you can still fly, mine is ruined due to not listening to what my mother told me , and carried on doing it..
  • #16 by AJ564 on 01 Nov 2017
  • Thanks for the receiver info - much appreciated.
    Perhaps I'll still give this a go then and if it proves too small for LOS, a good excuse to venture into FPV.

    Oh and just goes to show, your mother's always right!!
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