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Home✈️Aircraft🚁Helicoptere-SABGoblin 700 › Goblin 700 Tail stalling problem
03-12-2014 06:31 AM  6 years ago
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Heli Fanatix

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Fountain Valley, CA

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Goblin 700 Tail stalling problem
Hey guys,

I have a situation and seems to not be getting better. I've got a Goblin 700 (standard version with HPS head) with the following:

Xera 4030-560kv (I know it's a bit small but using it for the meantime)
18T motor pulley
26T tail pulley
Edge 693mm FBL
SAB 115mm tail blades
Torque 9180 x 3
Torque 9188
Kontronik Jive 120HV v9
12S Pulse 5000mah 45C

Tail belt tensioner is just above the side of frame
Tail shaft / pulley / hub / entire assembly is new & 12 flights old
Tail assembly is smooth and has fluid movement

Head Speed is as follows:
Throttle 55%: 1820
Throttle 60%: 1915
Throttle 63%: 1971
Throttle 67%: 2047
Throttle 70%: 2104
Throttle 73%: 2161
Throttle 76%: 2217
Throttle 80%: 2293

*I fly around 2100

My problem is whenever I do a:
Piro circle upright clockwise

My tail would stall or isn't smooth, Piroflip in either direction would be fine.

I'm using a HC3-SX. I have experience setting it up and my Logo 500SE has the same unit with no issues (tail holds solid on the Logo)on the exact same maneuver.

I was thinking, would these be the problem?
- is the motor too weak?
- should I switch to 27T tail pulley?

Any insight would greatly be appreciated.
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03-12-2014 06:49 AM  6 years ago
haha101

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jacksonville

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Do you have your travel maxed out on the slider? If i remember correctly, if you have it maxed out on the slider it will cause the blades to stall.Jeremy Strickland Evolution Helicopters, Optipower USA, Have a question? Send me a message!
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03-12-2014 06:34 PM  6 years ago
Heli Fanatix

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Fountain Valley, CA

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The tail pitch slider reaches its full travel on both sides.

So from what you are saying, I should give about 1-2mm on each side before it reaches it's maximum travel?
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03-12-2014 06:58 PM  6 years ago
504Rone

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New Orleans, LA.

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Back off 2mm towards the boom. The other side is ok to max out.NO FLYBARS
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03-13-2014 12:04 AM  6 years ago
Heli Fanatix

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Fountain Valley, CA

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just out of curiosity, why would it make the tail stall?
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03-13-2014 12:56 AM  6 years ago
Craigdieslemac

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Valdosta, Ga USA

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What size tail blades are you running? I have my tail setup to just barely max out on either side of the slider, I a have zero issues.Aut viam inveniam aut faciam
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03-13-2014 08:03 AM  6 years ago
Heli Fanatix

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Fountain Valley, CA

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Hey Craig!

I'm using the Stock CF SAB 115mm
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03-23-2014 03:39 AM  6 years ago
Heli Fanatix

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Fountain Valley, CA

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I installed a Quantum 4530-500kv with 20T motor pinion. I also closed the gap between the pitch slider & boom. Tail held nice with the 26T tail pulley with no issues throughout all the headspeed.

Guess the Xera 4030-560kv wasn't strong enough for high speed pirouetting CW maneuver but OK for slower pirouetting.

Thanks for the all the inputs guys. Your responses are much appreciated.
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