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HelicopterMain Discussion › Warning!! Raptor Pilot’s…
10-06-2005 08:00 PM  12 years agoPost 1
3Dx

rrElite Veteran

Monterrey NL

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A nice afternoon flight almost ends in a tragedy!!
I was flying my Raptor 50 v2 yesterday, I was flipping 10 meters away from my
1 meter of the ground and in a second I lost the tail control, I didn’t have in of time to handle the situation and the heli went directly to some people, the only ting a cud do is to put the throttle hold to try to control the heli,
It crash no more than 20 centimeters from a friend!!!!!

After 10 minutes sitting and taking about the lucky we was, I starting looking for the reason of the tail failure…..
- Batteries OK. 7.20 volts with 1 amp load.
- Mechanics OK everything was in plaice.
- Gyro 401 looks good.

And finally find the problem; the tail pulley teeth worn down, in odder words no more traction for the tail blades.

So I rely recommend to open the tail cease and have a look to the tail pulley wornness’

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10-06-2005 08:17 PM  12 years agoPost 2
DaOne

rrApprentice

Prineville, OR - USA

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I would lean more to your 401 freaking out. Mine did. Do a search for "401 hard over". Mine failed in flight and resulted in a crash as well. Wont notice it if you reset the power because it will work fine again.

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10-06-2005 08:19 PM  12 years agoPost 3
Yug

rrMaster

UK. Herts

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You should inspect this regularly, then it would not have happened !
I think you should be checking EVERYTHING on a regular basis otherwise wou will get caught out and somebody may be seriously injured.

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10-06-2005 08:32 PM  12 years agoPost 4
3Dx

rrElite Veteran

Monterrey NL

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A forgot to sed the real intention of my Post, the intention is to let know the fast the pulley worn down, no more than a month from now a had new pulley in my Raptor.
I do have preflight inspection every flight and pos inspections,
The ting is the ridicules time this pulley worn down!!

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10-06-2005 08:38 PM  12 years agoPost 5
RaptorPraetor

rrApprentice

Carlsbad, New Mexico

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If you are running a 401 w/9254 or 9253 and a 6volt pack that is a disaster waiting to happen. If you read the gyro instructions and the servo instructions they tell you only to use 4.8 volt packs. It has been a problem for a long time and the servo goes hard over.

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10-06-2005 08:40 PM  12 years agoPost 6
DaOne

rrApprentice

Prineville, OR - USA

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The belt being too tight or loose can cause the abnormal wear. But still a month is crazy. However on this note I have seen one amoust rounded off being flown doing some crazy 3D and it never gave out. Just kicked a bit sometimes. I really dont think something like this would fail without some warning first. Tail starts kicking.... check it.

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10-06-2005 08:41 PM  12 years agoPost 7
DaOne

rrApprentice

Prineville, OR - USA

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RaptorPraetor, my 401/9254 did it on a 5volt duralite regulated system.

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10-06-2005 09:23 PM  12 years agoPost 8
Russ Delaney

rrApprentice

Ashbocking, Suffolk,​UK

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Upgrades

There is a good reason to upgrade parts like the pulley etc with metal ones if you intend to do 3D

Russ

Team Quick UK Pilot 20

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10-06-2005 09:31 PM  12 years agoPost 9
Snapy

rrNovice

Fort Walton Beach​Florida

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I like the upgrades dont have to open the tailcase to look for wear

Don

Build / Fly / Crash / Cry / Rebuild

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10-06-2005 10:26 PM  12 years agoPost 10
drdot

rrElite Veteran

So. California,​Orange County.

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fwiw..

Look for the cause...I've got pulleys on their third airframe...Wear has never been an issue if the belt is clean and not too tight...I even lube mine with silicone spray...Many of the Raptors I see have belts that are way too tight.

John.

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10-07-2005 12:05 AM  12 years agoPost 11
Yug

rrMaster

UK. Herts

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Snapy
The metal tail box looks great and I agree it's good for inspection, BUT its very heavy so you'll need to add loads of extra weight to maintain correct balance.

drdot, likewise, never had a problem with wear.

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10-07-2005 12:11 AM  12 years agoPost 12
greg

rrKey Veteran

Yorkville, IL

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I have the metal tail gear box because I like it not because it is needed and you don't need a lot of extra weight to counter balance it (it is relatively light). It all depends on the battery you are running up front. And where your tail servo is. Also something is definitely wrong if you wore the stock plastic gear down. You must have had a ton of slipping going on back there.

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10-07-2005 02:04 AM  12 years agoPost 13
Yug

rrMaster

UK. Herts

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greg
I like it too. That's why I bought one, but when I weighed it it was about 20g heavier so I never used it.. I would like one for the R90 as there is deffinately an issue with being able to inspect the gears and the dreaded pin.

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10-07-2005 03:00 AM  12 years agoPost 14
Snapy

rrNovice

Fort Walton Beach​Florida

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Guy
your R50 hyper isnt going know that 20 grams is even there
i think if you try it youll agree with me.
i got mine from cforcht right here on RR

Don

Build / Fly / Crash / Cry / Rebuild

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10-07-2005 03:34 AM  12 years agoPost 15
DaOne

rrApprentice

Prineville, OR - USA

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The more I think about this I am starting to wonder if it has something to do with the regulator as I see you run a lithium pack (7.2 under load). You run a duralite setup as well?

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10-07-2005 03:39 AM  12 years agoPost 16
Stet

rrElite Veteran

Key Largo FL

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Over 300 flights on my raptor V1 and no wear on the tail pulley. I never understood the value of a metal pulley, but now reading this maybe for the guys that run the machine at 150% all the time, it would make sense. I tend to think though that something was amiss, belt too tight or too loose or something.

keepin' it real

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10-07-2005 03:46 AM  12 years agoPost 17
DaOne

rrApprentice

Prineville, OR - USA

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I just dont see how that part being worn could cause a violent pirouet that results in a crash. Maybe if the belt snapped or something bound up like a servo arm over traveling and causeing a bind. The nature of a belt drive system would still turn the tail enough to have the ability to control it. It wouldent just all of a sudden let go like this. It would more less cause the tail to kick as the belt skips.

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10-07-2005 05:02 AM  12 years agoPost 18
Jason WAI

rrVeteran

Hong Kong

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I've just had the tail pulleys replaced. it worn but had not caused a problem in tail's control.

it sounds that it might be caused by other issues.

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10-07-2005 05:33 AM  12 years agoPost 19
3Dx

rrElite Veteran

Monterrey NL

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Yes DaOne, Am using Duralite Battery and regulator, And my flight is lots of hard and pouching limits 3D, and that happened when a was flipping no more than 1 meter from the grown, and yes I had a warning but honestly I tot the problem was low RPM 1800 Because the filing with the problem was ending the tail rotor power with the torque of main blades, and that’s normal for 401 in hard 3D and fast inverted reverse flight.
Am more use to the 601 and 611.

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10-07-2005 05:36 AM  12 years agoPost 20
rstacy

rrElite Veteran

Rochester, NY

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DaOne

I just dont see how that part being worn could cause a violent pirouet that results in a crash. The nature of a belt drive system would still turn the tail enough to have the ability to control it. It wouldent just all of a sudden let go like this. It would more less cause the tail to kick as the belt skips.
When the pulley decides to go, it goes quickly.
Below is a picture of the rear pulley off of our Raptor 50 that caused a crash during a night flight. Earlier in the day there was one tail kick during a flight. It could have easily been missed but we saw it and didn't think much of it. We thought it must have been a glitch. In the right maneuver you wouldn't have even noticed it. 2 more flights without a problem and then the night flight when it just let go and started pirouetting. The tail rotor system has enough drag that a pulley without teeth will pirouette as fast as a pegged left tail rotor stick.

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