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brettskywalker48 · 10-23-2012, 04:00 PM

Finally having the chance for a test run with my neverflown new hk450pro tt fbl with my new zyx s went bad 30 seconds in, hovering at about 3ft high. I think the gain is too high somewhere, as the tail would pull 2 inches left & right, short quick wags nonstop. I was relieved i wasnt having any problems holding a steady hover, then disaster struck. 1 of the flipping tail rotor grips shot off, started to spin, set her down fast, main rotor chopped the boom & it shot out like a rocket. The boom flew about 7ft from the heli, with the rudder servo still attached breaking the case in multiple spots. Screwy thing is i checked the main feathering shaft & tail rotor grip to hub tightness RIGHT BEFORE I ATTEMPTED TO FLY. I think the hk clone grip was out of spec & the bearing wasnt seated correctly. All the bearings & the grip retaining bolt are still attached to the hub, like the grip just slid right off it. What should my gain setting be at or near in my TX??

NJflya · 10-23-2012, 05:05 PM

I have mine at 61 in normal mode and 57 in idle and 100 in the gyro.

Dr. M · 10-23-2012, 09:19 PM

Sorry to hear of your crash. I hate it when I read of maiden flights going bad...

Sounds like your tail blade grip was so poorly machined that it slipped right off the bearings. Either that or the top bearing was not seated properly during assembly.

Anyways, tail gain on a 450 using zyx and a spektrum radio should be around 60-68. When you tune it, go low (58) and increase 2-3 points at a time until you see wag in FFF. Then go down a notch. Do the tuning at the highest HS you intend to run.

Epoweredrc · 10-23-2012, 11:42 PM

Dude do you got that on video? Sorry to hear all helis but triple with clones you want to take apart check oil bearings install loc tit and re assemble

Sent from my ZTE-Z990G using Tapatalk 2

brettskywalker48 · 10-24-2012, 10:00 PM

Thanks for the info on the tx gain setting. I tried to get my buddy to record t on my phone but he left for food. This is the first time ive had any part of any of my helis fly off. Crazy the complete grip came off leaving the bearings still bolted to the tr hub. The hk kit came in pre assembled groups of parts, all of which i removed, blue loctited, & replaced the bolts/parts. Also oiled all the bearings. I looked at the inside of the tr grip & it looks more oval shaped than a perfect circle. I have half the parts i need to repair & the rest should be here thurs or fri. My tx gain is prob too high its at 81, when i was setting up the tarot i was getting a lot of servo noise & it decreased when i raised the gain. I m ready for a flight longer than 30seconds. If any more crazy flukes come flying out of this hk i ll probably move everything back onto my b400, & slowly replace all the hk parts with align or tarot

10-23-2012, 04:00 PM	#1 (permalink)
brettskywalker48 Registered Users Join Date: Feb 2012	1st FLIGHT TEST W/ ZYX S TURNED DISASTER. Finally having the chance for a test run with my neverflown new hk450pro tt fbl with my new zyx s went bad 30 seconds in, hovering at about 3ft high. I think the gain is too high somewhere, as the tail would pull 2 inches left & right, short quick wags nonstop. I was relieved i wasnt having any problems holding a steady hover, then disaster struck. 1 of the flipping tail rotor grips shot off, started to spin, set her down fast, main rotor chopped the boom & it shot out like a rocket. The boom flew about 7ft from the heli, with the rudder servo still attached breaking the case in multiple spots. Screwy thing is i checked the main feathering shaft & tail rotor grip to hub tightness RIGHT BEFORE I ATTEMPTED TO FLY. I think the hk clone grip was out of spec & the bearing wasnt seated correctly. All the bearings & the grip retaining bolt are still attached to the hub, like the grip just slid right off it. What should my gain setting be at or near in my TX??

10-23-2012, 09:19 PM	#3 (permalink)
Dr. M Registered Users My HF Map location Join Date: Jun 2011	Sorry to hear of your crash. I hate it when I read of maiden flights going bad... Sounds like your tail blade grip was so poorly machined that it slipped right off the bearings. Either that or the top bearing was not seated properly during assembly. Anyways, tail gain on a 450 using zyx and a spektrum radio should be around 60-68. When you tune it, go low (58) and increase 2-3 points at a time until you see wag in FFF. Then go down a notch. Do the tuning at the highest HS you intend to run. __________________ CopterX 450 Black Angel FBL "Night Rig" \| ZYX v4.0 PRÔTOS 500 FBL "Sky Whip" \| Robird G31 Audacity P6 FBL "Phoenix" \| MSH Brain \| 12s Goblin Speed \| iKon

10-23-2012, 11:42 PM	#4 (permalink)
Epoweredrc Registered Users Join Date: Aug 2007 Location: Georgia	Dude do you got that on video? Sorry to hear all helis but triple with clones you want to take apart check oil bearings install loc tit and re assemble Sent from my ZTE-Z990G using Tapatalk 2 __________________ RAW 580 ,lots of Planes Powered by IX14 AMA 36 yrs.

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10-23-2012, 05:05 PM	#2 (permalink)
NJflya Registered Users Join Date: Nov 2010	I have mine at 61 in normal mode and 57 in idle and 100 in the gyro.

10-24-2012, 10:00 PM	#5 (permalink)
brettskywalker48 Registered Users Thread Starter Join Date: Feb 2012	Thanks for the info on the tx gain setting. I tried to get my buddy to record t on my phone but he left for food. This is the first time ive had any part of any of my helis fly off. Crazy the complete grip came off leaving the bearings still bolted to the tr hub. The hk kit came in pre assembled groups of parts, all of which i removed, blue loctited, & replaced the bolts/parts. Also oiled all the bearings. I looked at the inside of the tr grip & it looks more oval shaped than a perfect circle. I have half the parts i need to repair & the rest should be here thurs or fri. My tx gain is prob too high its at 81, when i was setting up the tarot i was getting a lot of servo noise & it decreased when i raised the gain. I m ready for a flight longer than 30seconds. If any more crazy flukes come flying out of this hk i ll probably move everything back onto my b400, & slowly replace all the hk parts with align or tarot

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