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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › tail drive belt tension:V1 raptor 30 ???
11-09-2005 12:13 AM  14 years ago
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toejab

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Buffalo ,New York area

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tail drive belt tension:V1 raptor 30 ???
i had a light? tail boom strike today. it flattened thetop of the boom to about 1/2 of its original thickness.no other apparent damage. ( will find out when i fire it up)... that boom replacement was pretty straight forward(never built the rappy ), but the manual says to pull back on the boom so that no more that 5mm of slack is in the belt. where do you check this slack?? also...i turned the belt 90 degrees as told in the book...i twisted it counter -clockwise (to the left)as i stood to the helis left rear side, nose pointed away from me...was this the correct direction to twist the belt. thanks larry
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11-09-2005 12:18 AM  14 years ago
PaulJC

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Hertfordshire UK

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To check for the correct rotation spin the main rotor C/W from above and the tail rotor should turn CCW while looking at the side of the tail rotor (as opposed to the fin).

The belt tension should be checked between the main gear and tail guide pulleys .
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11-09-2005 12:22 AM  14 years ago
toejab

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thanks for the quick response! i will go finish the job now. is the tension that important as far as the 5 mm, or is a light tug on the boom good enough?
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11-09-2005 12:25 AM  14 years ago
PaulJC

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I normally just pull the boom till it will move no further, you have to try VERY hard to pull the belt tight, you get a feel for it after you've done it a few hundred times lol.

Also if your indoors, once out in the cold it would need reajusting anyway.
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11-09-2005 12:29 AM  14 years ago
toejab

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are you saying that bringing the heli out into the cold would make it tighter due to contraction? larry
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11-09-2005 12:30 AM  14 years ago
PaulJC

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Just for reference, i was thinking 50 with a driven tail and the 30 is different.

On a 30 just perform the test in the reverse direction as the tail rotor will not move with the rotor being turned C/W
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11-09-2005 12:33 AM  14 years ago
PaulJC

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are you saying that bringing the heli out into the cold would make it tighter due to contraction? larry
No, it makes it looser as the boom contracts, once you've adjusted it out in the cold remember to loosen the boom when you go inside, the boom rarely expands enough to make it too tight for storage but its generally too tight to be run.
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11-09-2005 02:56 AM  14 years ago
toejab

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Buffalo ,New York area

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job completed correctly thanks to PAULJC....thanks , larry
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