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Goblin 280 SAB Heli Division - Goblin 280 Helicopters


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Old 01-17-2021, 06:18 PM   #1 (permalink)
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Default Highest head speed you run

I was having some fun with my Havok today and thought I'd experiment with higher head speeds. I've been flying around 4000-4100 rpm head speed while things were breaking in. I went to around 4300 and started getting more vibes. I then went past that and they calm down. I am thinking the air rushing past the canopy is causing it to vibrate. I added some super tiny foam dots on the boom where the canopy touches just to add a little damping. On my last flight of the day I also taped the top back of the body together which also helped.
At 81% on stunt 2 my max RPM was 5045. It was really screaming but still very smooth, No signs of any shaking or visible vibes when hovering. Tail gains did need to be turned down to 25% with my Brain2 to prevent shaking on right hand hard stops.

I will say I felt the need to stand just a little further back at these speeds, lol.
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Old 07-25-2021, 03:33 AM   #2 (permalink)
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Running 3800rpm for mild 3D and 3500rpm just for flying around. Perfecting my upright maneuvers…
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Old 07-25-2021, 08:19 AM   #3 (permalink)
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when i had one, i dont think i went past 3800.. it did everything i needed.. anything past that was waisting flight time.
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Old 07-25-2021, 09:06 PM   #4 (permalink)
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I'm still zipping around using ~ 4100 RPM. It is hard to not love the punch it has with the competition motor. At the same time I'd like to try the regular motor for my backyard flying which should give more run time. Maybe someone has a regular motor they want to sell as they switched to the competition.
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Old 07-26-2021, 08:59 AM   #5 (permalink)
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the stock motor isnt gonna give you much more flight time. lower head speed and bigger lipos will
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Old 07-26-2021, 09:46 AM   #6 (permalink)
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Yes a bigger LiPo and lower head speed will help but the competition motor and ESC are not running in the optimal power range at 3800 or 4100 RPM - that is only 60% of the max throttle or so. Running around 80-90% would be better, but with the comp motor the head speed would be insane.
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Old 07-26-2021, 09:57 AM   #7 (permalink)
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Quote:
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Yes a bigger LiPo and lower head speed will help but the competition motor and ESC are not running in the optimal power range at 3800 or 4100 RPM - that is only 60% of the max throttle or so. Running around 80-90% would be better, but with the comp motor the head speed would be insane.
So go 5S. 60% at 6S would be roughly 72% & 4S would be 90%. And go up to 1500mAh (1800mAh for 4S).

I think Tony had tried one or the other already and hopefully he’ll share his thoughts.
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Old 07-26-2021, 10:15 AM   #8 (permalink)
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That would work but buying all new batts isn't very optimal.
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Old 07-26-2021, 10:27 AM   #9 (permalink)
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this size heli has a bunch of limiting factors.. no gearing, very touchy tail.. it may wag, it may not. expensive for what it is.. once everybody gets it going, they wanna slow it down. its tail heavy no matter what.
i never had a problem running it at 60%. with 6s.. i did try 4s and that was a no-go.. never tried 5s, but i had a stock motor and never saw a need for the comp motor.
i had a lot of $ in mine and wasnt really impressed with it at all. so i sold it. i havent really flown my logo 200 much, but i like it better than this 280
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Old 07-26-2021, 11:06 AM   #10 (permalink)
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I got mine for a great deal, it is the Havok edition which has several improvements. I have no wag issues, but tail tuning is touchy. It is a blast to fly, I'm considering a second one if the opportunity arises.
It is tail heavy, especially with 1050 mAh LiPo's. Having fun in the backyard gives 3.5 minutes of flight time.
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Old 07-26-2021, 04:21 PM   #11 (permalink)
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get more lipos and enjoy the flying.
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Old 07-26-2021, 06:16 PM   #12 (permalink)
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Get some bigger LiPos. Most of mine are 1250-1300 mAh. Weights are ~210-230gm. Balance is pretty good….

If you’re buying new LiPos then there might be some Tattus R-Line Gen4 packs that are 1400mAh and about the same size / weight as the older ones…

https://www.genstattu.com/TA-RL4-130C-1400-6S1P
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Old 07-26-2021, 10:46 PM   #13 (permalink)
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Those Tattu 1400 mAh packs do look to be pretty much bang on to balance the heli. There might be some in my future.

I could also move the ESC to the top front but it sits so nicely on the bottom and I have my receiver out front.
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Old 07-27-2021, 02:47 PM   #14 (permalink)
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…. Just a thought:

5S-1550mAh (214 grams)

https://www.genstattu.com/ta-rl3-120c-1550-5s1p.html

(might have to get one just for fun)
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Old 07-27-2021, 07:05 PM   #15 (permalink)
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I think I'll try switching from the Hobbywing governor to the Ikon gov so it's easy to see the total power(throttle out) being used during my hard maneuvers. Might give an idea if 5S would be enough.
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Old 07-27-2021, 10:55 PM   #16 (permalink)
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Quote:
Originally Posted by TheSteve View Post
I think I'll try switching from the Hobbywing governor to the Ikon gov so it's easy to see the total power(throttle out) being used during my hard maneuvers. Might give an idea if 5S would be enough.
You can see the ESC output by logging: “ESC Power Output PWM”. No need to reconfigure the Governor
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Old 07-28-2021, 12:57 AM   #17 (permalink)
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Good to know. I wanted to give the Ikon gov a try anyway as I've never used it but will be with a goblin 570 shortly. Always nice to experiment on the small craft first.
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