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HelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Venture 30 and the cold?
12-01-2005 01:51 AM  12 years agoPost 1
hueyman

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Joliet, Il.

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I've got 1/2 gallon through my venture 30 and the tail has been flawless. i had it out today and the tail rotor control started fading when applying nose right. when i got it on the ground i could get full nose left pitch but the tail rotors would not go past nuetral pitch when applying full nose right. i killed the engine, shut down power and carried it to the bench. when i switched power back on and the tail started working again. i'm using a 6102tx, r700rx, g410t gyro and jr537 servos. only difference today was the air temperature @ 28deg. previously had it up in 40deg. plus weather. any suggestions as to what caused this failure?

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12-01-2005 02:04 AM  12 years agoPost 2
RobGiles(JR)

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Ocala, Florida USA

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Bad servo?

Sounds like ya got a rudder servo going....bad servos will be more noticable when you have a load on them...That may be why you did not notice the problem once you had it on the bench....send in the servo....JR will check it out for ya....you might want to run something with a little more torque and faster than a 537 though...Hope that helps...Regards,

Rob Giles
Team JR

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12-01-2005 02:28 AM  12 years agoPost 3
wolfdad

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Southern Maryland

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Check and see if your tail boom loosened up in the colder temps and slid in. Not only will this cause your TR drive belt to loosen, but it will take your tail rotor completely out of rig. If this is the case, the only good solution is to re-adjust your tail boom and, using one of the Vigor metal tail boom clamps, slide it down against your side frames and tighten it up. This will prevent your tail boom from loosening and sliding inward on cold days. This is a known problem with the Ventures, by the way.

wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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12-01-2005 11:45 PM  12 years agoPost 4
jgoodsell

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Sherbrooke, Qc, Canada

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Like Wolfdad Said,
I think the cold changed your Boom lenght so this can oviusly change de T/R linc lenght.

I'd also check your Gyro... I had a bad 490T it was an intermitent trouble and i couldn't turn the tail on one side in the air.. but on the table it was all fine !!

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12-02-2005 01:08 AM  12 years agoPost 5
hueyman

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Joliet, Il.

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Thanks to all for the input. The tail boom appears pretty secure as i left the heli outside (28deg) for about thirty minutes and tried to move the boom - no go. The tail servo is a JR DS537, digital i believe. Are there any known issues with this servo. I'm thinking it might have been condensation in the gyro as i had the heli in the very warm car and only had it in the ambient temp. for about 2-3 minutes before take off. I also suspect the battery more than anything. When i put it on charge it took 500mah. That was after a full charge, 12 hours of sitting (connected to nothing) then 5 minutes of flight time. It's a 1400mah battery and seems like it used too much capacity for one 5 minute flight. I'll also check for binding, etc... Sure wish it wasn't intermittent. Like i said, previous to this the tail was solid and response was right now. Let go of the stick and the tail locks right now.

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12-02-2005 01:54 PM  12 years agoPost 6
Dr.J

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Ontario, Canada

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Whenever you fly your machine in different temperatures, the first thing you need to check is tail belt tension. What happens is that the tail boom, aluminum or c/f, will shrink, as the temperatures fall and, as a result, the belt will become loose. As the temps increase, you have to check to make sure the belt doesn't become too tight.

I'm sure this added to your problems, but, as the fellow above points out, there could also be a servo issue. First thing's first, however, always check belt tension when flying in the cold.

Hope this helps,

John

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12-30-2005 02:02 AM  11 years agoPost 7
hueyman

rrApprentice

Joliet, Il.

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After replacing the tail servo with known good servo, replacing the rx battery, changing the gyro mounting tape, checking for mechanical binding and cleaning/securing all electrical connections, the gyro is still acting up. Also played with the gain from 30% to 80% - no change. Took the top case off and checked for signs of moisture, corrosion and loose connections and did not find any obvious problem. It seems to work fine when i switch the tail lock off. however, once turned on in tail lock mode the servo will slowly migrate to max. throw in one direction or the other with no stick input or heli movement. this takes about one minute from power on. if i wiggle the rudder stick the tail slider will center then start to creep to one side or the other again until it maxes out to one side. If the engine is running, it accelerates the servo creep where it takes only 10-15 seconds to max out left or right. It does not do this when tail lock is manually switched to off. Is it time for a new gyro?

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HelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Venture 30 and the cold?
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