FRCFOAMIES SU-37 MK1

Discussion in 'FRCFoamies Plans' started by Boxermad84, Sep 15, 2012.

  1. hb9801

    hb9801 Cadet

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    Thankx for the advice.... however the fishtailing was before the stabilizer. It WAS flying really smooth today..... until I flew out of the rx range! Guess what... crashed it and because I tried the kf4 profiles I had not enough up trim on the elevator. Well, my carbon rod was a really good idea... just need a new nosejob. However couldn't wait and flew with the broken nose!!!
     
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  2. hb9801

    hb9801 Cadet

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    Ok, thinking of it... I will try to make a different approach with the nose... solid nose from multiple layers of depron. Work last time on my little F-4 phantom
    [​IMG] already glued it together with .. tatatah.. uhupor

    [​IMG]

    Helge
     
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  3. F1wanabe

    F1wanabe Administrator

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    I used to always do that cf rod up to the nose and it really works!

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  4. hb9801

    hb9801 Cadet

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    Ok. Nose job done..Tomorrow testflight.com solid 16 layers of depron nose.[​IMG][​IMG]
    Added weight only 35 g

    Cheers Helge
     
  5. F1wanabe

    F1wanabe Administrator

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  6. hb9801

    hb9801 Cadet

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    Thanks. Thats true, your design looked really slick and scale. However repairing score and fold is difficult to repair when the internal structure is also squished. This gives me hopefully some additional protection when pilot error strikes again...
     
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  7. yup looks really good. nice job
     
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  8. hb9801

    hb9801 Cadet

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    Finally the weather was good enough to do some flights. I was curious to try out a 4s setup.. well it sucked! Some how my 60 amp esc does not like full throttle on a 4s with the ntm 2700kv motor. Does anyone has the specification of that motor to adjust my esc setting. Somehow it cuts out at slightly above half throttle. 3s is fine and actually good enough, but with the repaired solid nose it put on some weight. Well its a heavy fighter anyway.
     
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  9. F1wanabe

    F1wanabe Administrator

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    Hb9801,It must be drawing too many amps for your esc and the esc is cutting out. I'm using an exceed proton 60 amp just fine. A question :are you using 40c minimum batteries? For that motor on 4s, even 3s you need a higher discharge battery. The motor timing on the esc should not cause that. Also, on 4s you should be using a 4-5 inch prop to be safe with your amp draw. I used a 4.5x4.5 just fine.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  10. Airflow

    Airflow Top Gun

    What ESC are you using? I have 2 TGY 60A Plush running my big 4 motor Su-37
    For two of the motors, NTM 2700kv. Works great on 4s! Timing set to high, zippy 2000mAh 45c Flight Max. (6x4 APC prop, not good for these motors, but I have no other option right now)
     
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  11. Airflow

    Airflow Top Gun

    Yes! 6x4 is not good for the 2700kv ... with 4s batteries;-)
     
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  12. hb9801

    hb9801 Cadet

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    Ok, thanks for that information. Aktually it is a 70Amp ecs with external 5A BEC. Unfortunatly I do not have these small props. How much amps does this sucker draw on 4s.
    For calculation purposes I use www.ecalc.ch. unfortunatly there is no ntm 2700 kv motor. So I used an
    ElectriFly AMMO 28-35-2700 2700kv 550w 94gr as a reference. With a 7x4 prop it will output 55oz of thrust on 3s. With a 4.75x4.75 prop on 4s only 51oz thrust. 6x4 4s horrifying 69oz thrust with 45Amps draw,
    on 3s only 44 oz but the prop will stall in flight. Anybody can confirm these values?
     
  13. F1wanabe

    F1wanabe Administrator

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  14. hb9801

    hb9801 Cadet

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    Thanks, stupid me. I could have that look up myself. So anyhow what are the recommended esc settings?

    here is the manual for my esc

    Option 2. Throttle Setting ?— —
    •• — 2 Short + 1 Long Auto Throttle Range *
    •• — — 2 Short + 2 Long 1.1ms to 1.8ms
    •• — — — 2 Short + 3 Long Hard Acc*
    •• — — — — 2 Short + 4 Long Soft Acc
    Option 3. Brake Setting ?— — —
    ••• — 3 Short + 1 Long No Brake
    ••• — — 3 Short + 2 Long Soft Brake*
    ••• — — — 3 Short + 3 Long Medium Brake
    ••• — — — — 3 Short + 4 Long Hard Brake
    Option 4. Direction and Cutoff Type
    ?— — — —
    •••• — 4 Short + 1 Long Clockwise Rotation *
    •••• — — 4 Short + 2 Long Counterclockwise Rotation
    •••• — — — 4 Short + 3 Long Soft Cutoff
    •••• — — — — 4 Short + 4 Long Hard Cutoff *
    Option 5. Timing Mode Setting
    ?— — — — —
    ••••• — 5 Short + 1 Long 1º - For 2-4 Pole Inrunner Motors *
    ••••• — — 5 Short + 2 Long 7º - For 6-8 Pole Motors
    ••••• — — — 5 Short + 3 Long 15º- For 10-14 Pole Outrunner Motors
    ••••• — — — — 5 Short + 4 Long 30º - For 10-14 Pole High-RPM Outrunner

    Option 6.
    Pulse Width Modulation(PWM) Setting
    ?— — — — — —
    •••••• — 6 Short + 1 Long 8KHz – For low RPM and low pole count motors *
    •••••• — — 6 Short + 2 Long 16KHz – For most out runner motors
     
  15. F1wanabe

    F1wanabe Administrator

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    Np! The default should be fine. I left mine there and it did super! After dialing in the power system with proper battery and prop, you can start messing with the timing, but that's about it.
    This is the ntm on 4s with 5.25x6.25 prop.
    Delta Mig v3 4s Speed Test 1:

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  16. hb9801

    hb9801 Cadet

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    ok, thanks I will try the defaults and stick with 3s. I need a better camera to get some video footage.
     
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  17. F1wanabe

    F1wanabe Administrator

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    A good head cam is really nice if you don't have a camera person. I used the contour 1080 until last year when they went out of business. I then got the Sony AS15 action cam. Very nice! But I see contour is now back in business! Good luck!

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  18. hb9801

    hb9801 Cadet

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    Well, I have a old GoPro 1 but I do not like the fisheye view. And it is kind of to far away. So I keep on looking. Thanks Anyway for the big help
     
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  19. F1wanabe

    F1wanabe Administrator

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  20. fmt2bx

    fmt2bx Ace Pilot

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    Thanks, it is a HOT plane!!!

    When you say counter rotating, pusher is the same thing right?
     
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