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HelicopterAudacity Models P6 Pantera - Tiger 50 › Pantera 50 head vibration-SOLVED
11-27-2007 09:34 PM  9 years agoPost 1
tracvision

rrApprentice

Tampa, Florida

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I'm having issues with my Pantera 50 that has me at a loss. Yesterday, I found the blade grips worn to the point that the bearings would fall out of them, when held in your hand. I replaced the grips , retracked the blades on the bench and went for a test flight.

The blades tracked but there was still vibration in the body. I removed the entire head and ran the heli to visually inspect the main shaft. It was bent. This has not even been landed hard.

I removed and replaced the main shaft and rechecked my tracking. All seemed well. I did a few circuits and then landed for a visual. All looked well.

I then took it aloft and went through a few rapid flips and rolls. After 3 or 4 minutes, I came back in and noticed the canopy shaking again. It was another bent mainshaft. I have never bent a mainshaft in flight.

The blades are 600mm Gohbee CF and are balanced perfect and the blade cg is also perfect. This whole thing has me at a loss. Any ideas?

[B]

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11-27-2007 09:43 PM  9 years agoPost 2
mlucia

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Essex Jct., Vermont

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Are you sure you didn't have a bumpy auto or rough landing?
Sometimes it does not take much to bend the spindle or main shaft if you slam it just so. To be on the safe side I would replace the main shaft and spindle.

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11-27-2007 09:48 PM  9 years agoPost 3
tracvision

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Tampa, Florida

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no bumpy landing

madcowvt,

No bumpy landings. You'll see in the post that the shaft and grips were new. The spindle was also replaced. The test flight is where the vibration was caused and there was only one landing prior to the vibration and I assure you it was silky. Thanks for the info.

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11-28-2007 04:37 PM  9 years agoPost 4
tracvision

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Tampa, Florida

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SOLVED

As you may remember, I pulled the entire head and ran the heli to see if the main shaft was bent. It wobbled so I assumed it was. It wasnt!! It was the main upper bearing that was bad. I pulled the shaft and bearing to inspect closer. I put the bearng on the shaft and it was tight with no slop. I rotated it a few times and then got some play. I assume the inside of the bearing tightens and loosens as it is rotated. I learned a good lesson here in the importance of good bearings and regular replacement. Thanks much for all of the advice. DudeII and others sent me down the right road.[B]

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11-28-2007 04:51 PM  9 years agoPost 5
Futura57

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UK

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I'm having a similar problem. No more than 10 flights on my Pantera 50 and absolutely no bumps. I have the canopy wobble indicative of a head imbalance. I also noticed the tracking was off on my last flight yesterday after stationary rolls and flips being the worst I threw at it. I guess a strip down to check it all over (inc bearings) isn't a bad idea

Hardware eventually fails - Software eventually works!

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11-28-2007 09:50 PM  9 years agoPost 6
tracvision

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Tampa, Florida

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Canopy shake

Futura,

Read the post from DudeII about securing the bearings in the tail section. This seems to be an issue with mine also. Also check the top main bearing or just swap it out.

Harold

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