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HelicopterMain Discussion › Cold weather tail booms
10-22-2004 04:31 AM  13 years agoPost 1
c140flyer

rrNovice

Rockport,MA USA

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I started flying helis last summer and had a ball! As the weather got colder here in New England, I noticed that the aluminum tail boom in my heli would shrink and cause the drive belt for the tail rotor to go slack. If I let the heli sit in the cold for a while and adjust the belt tension accordingly, there would be no problem. I would just have to remember to loosen it again before bringing it home or the belt would be as tight as a drum and probably stretch.
My question is this,,,,,
If you replace the boom with a carbon fiber one (with a different co-efficient of expansion) will the problem go away?
Thanks for any advice.
Larry

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10-22-2004 04:41 AM  13 years agoPost 2
gwallace1

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Susanville, CA

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If it is a belt drive tail, the belt will still shrink and expand as well, so changing the boom may not cure the whole problem. I actually had the opposite prob....when it was cols the belt seemed to get tighter with the contraction from the cold, and slack as the helo warmed up. I learned to go fly for a minute or two, land and re-check.

Greg

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10-22-2004 05:08 AM  13 years agoPost 3
docloc

rrApprentice

WI, Osceola

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I don't see why there isn't a belt tensioner on the tail. It would be an easy fix for belt adjustments.

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10-22-2004 05:15 AM  13 years agoPost 4
rtrickyjr

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Drumore, PA (SW of​Quarryville)

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docloc ...

Hey, that's a pretty good idea, bet that'd cure the problem, too

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10-22-2004 01:24 PM  13 years agoPost 5
dariof

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Henderson, NV /​Laguna Niguel, CA

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A belt tensioner would probably work, but more to go wrong. I can hear it now....I lost T/R authority because the tensioner failed.

Why not just check the tension of the belt and pull the boom backwards when needed to keep the belt tight . That is how I do it on my Raptors. THe 90 has a torque tube..no need.

Best Regards, Dario

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10-22-2004 02:14 PM  13 years agoPost 6
Camp

rrApprentice

PA kinda. Mostly OTR​driving

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A tensioner can be as simple as a spring loaded pulley riding against one side. I built something like that for the motorcycle. Even if it fails the belt is no looser than the original setting, the tensioner just takes up any slack.

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10-22-2004 02:33 PM  13 years agoPost 7
greenboot

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Marblehead, OH

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The thermal expansion of aluminum is 12 x 10-6 in/in/degF. For a 30 inch boom, a 30 deg temperature change will shorten the boom by .01 inch. Probably not enough to worry about.

Tom

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10-22-2004 02:38 PM  13 years agoPost 8
z11355

rrMaster

New England

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I'd say the table doesn't jive w/ reality because
the boom shrinks by more than that.

for the winter, I just try to find a happy compromise
tension so that it's tight enough to fly and doesnt
over-tension when sitting in the house. And then
readjust in the springtime

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HelicopterMain Discussion › Cold weather tail booms
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