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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Bando PU tail belt questions. Weakened?
09-14-2009 11:23 AM  11 years ago
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LaurenceGough

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UK

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Bando PU tail belt questions. Weakened?
Hi everyone,

Just have a question that is on my mind... Yesterday I had a great flying day but on the last flight the tail belt snapped and exited the helicopter, I autoed it okay without damage but I wouldn't really want this to happen again...

Me and my friend took the belt and inspected it, no visible wear could be seen. He took the belt in his hands and was quite easily able to snap it by pulling on it. I have tested belts before and me and my dad couldn't snap them by hand....

The belt had about 80 flights on it and about every 30 flights had pure silicone spray (nothing else) applied to it lightly/evenly using a spray.

Belt was about medium/high tightness. Nothing is touching the belt and all pulleys are free spinning with smooth bearings. No strange noise, flight performance was great....

I have never had this happen before. Bando is a very big belt company so I don't understand...

I have attached some pictures of the same belt that snapped.

Can anyone help me out with what's happened to this particular belt?

Thanks,

Laurence
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09-18-2009 06:58 AM  11 years ago
LaurenceGough

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I've installed it without any silicone this time, I hope it's better. I'm going to pick up some graphite spray later and apply it to the belt (not sprayed directly).
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09-18-2009 12:43 PM  11 years ago
Swoop

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Newark, DE USA

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Yes, its been my experience that they are pretty tough. Is this a 450 belt? I've broken a couple of them when my boom slid in allowing the belt to wind around the rear pulley.

The full size one on the Raptor lasted a couple of years, but started losing teeth. Never broke, but still needed replacing.

I've heard that Silicone spray is safe, but maybe the stuff your using is not compatible with the belt. I would discontinue using the spray or switch to something different. I've never used spray of any type on my belts.
Chris
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09-18-2009 02:45 PM  11 years ago
jbiter

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Sebring, FL

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Belt was about medium/high tightness
Maybe too tight? Belt with cogs such as the belt in question do not need to be tight to work. A too tight belt will actually rob you of power through drive system drag.

I too have never used a silicone spray on any of my belt drive helis.

Jeff
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09-18-2009 04:00 PM  11 years ago
VooDooX

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San Francisco Bay Area CA, US (San Mateo)

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sounds like dry rot on the plasticVelocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001
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09-18-2009 05:06 PM  11 years ago
LaurenceGough

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UK

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Hi guys, first of all thank you for your replies.

Yes, this is a Bando 450 belt. The boom hasn't moved at all, it's very secularly clamped in with nuts and bolts.

It's just that my last Bando belt lasted a lot longer, even with Silicone.

This spray is pure silicon, doesn't mention anything else at all on the can, unless the propellent is causing harm?

If I had the belt any looser it would slip a little on hard (not silly speed) piro reversals/stops. It isn't too tight, the main rotor still spins very freely.

VooDooX, you mean the belt has dry rotted?
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09-18-2009 06:17 PM  11 years ago
bstock

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Easton, MD.

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I think you are going to find that we are not going to come up with a definative answer for you... but my guess is also that the belt is suffering from dry rot.

The way you describe it tearing apart so easily... that's all I can think of.

I use silicon also on my belts... and it has not seemed to affect them in all of these years. The head does spin more easily, and it helps dispurse static electricity... which I like both of those so I think it is well worth it..

I should say that the 450 belt is much more fragile than those on the 600n and the Hurricane... so with all of the crashing I haven't had one last on that heli for more than a year... so I can't say for sure if the silicon is degrading that one or not... but the other 2 seem fine.
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09-18-2009 07:48 PM  11 years ago
LaurenceGough

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UK

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Yeah, I do ask some silly questions sometimes, but I just felt the need to post this as it's just so unusual. I've had two Bando PU belts on there before with Silicone which have lasted much longer, under the same conditions, and when I did finally crash them I tried to snap the belt and I couldn't, no matter how hard I/we tried! I didn't want to try snapping a new belt as I don't have too many left.

I spun it up quickly in the living room but didn't get to fly, seems as smooth as before so I guess I can stop worrying so much about the silicone being needed .

Edit:

Do food grade Silicone sprays smell when you apply them (I read up and they're "oderless"? The one I'm using has quite a unique smell, doesn't mention food grade but doesn't mention anything other than Silicone spray either.
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