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T-REX 450 › Trex 450 CF boom problem
12-28-2008 03:05 AM  8 years agoPost 1
Aaron1100us

rrApprentice

Cedar Rapids, Iowa

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I just got my CF tail boom off ebay today. The first thing I noticed was that it had no slot in the one end. I cut that out and it fit perfectly. Tightened it up and hmmm, its not tight. Took it out, roughed up the ends just a bit with sand paper and put it back in. Tightened it up and its still loose. No idea what to do now. The block that holds the tail boom won't come apart. I was going to sand the inside of the block but it won't come apart. Did I get a crappy boom or am I missing something? Any ideas on how to get it to work? Thanks

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12-28-2008 03:26 AM  8 years agoPost 2
bah7566

rrVeteran

Colorado

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You need to get the boom block apart and use 600 grit paper on a piece of glass to lightly sand the inside of each block so they go just a litter closer together when tightened up. They are probably held together with some stray loctite. Use a heat gun and heat them up a bit then try to pry them apart without damaging the blocks. They don't have to be smoking hot but fairly warm to loosen up any loctite that is on the aluminum tubes that hold them together.

I am a Heli addict!!!

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12-28-2008 03:30 AM  8 years agoPost 3
Aaron1100us

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Cedar Rapids, Iowa

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Ok, thanks, I'll give that a try.

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12-28-2008 03:37 AM  8 years agoPost 4
JFERA22

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MONTEREY,CA

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CF Tail Boom

Hay Aaron1100us I had a similar problem with an aftermarket boom,You have to take the boom block completly off get it apart you might have to heat it up just a little, because you more than likly the loctite seeped in around the 4 pins. Once apart get some 400 wetdry sand paper an a hard flat surface and sand the inside of both blocks JUST A LITTLE you might have to sand the ends of the pins too,but sometimes you can just get away with just sanding the blocks. If you need to sand the pins put all 4 of them into one half of the block and sand them on the even surface all at th same time so that there even.This works great just be carfule when you tighten up the screws you can realy put a lot of pressure on the boom and smash the carbon!! this works great and your belt will never get loose again because of the boom sliding forward good luck I hope this helps. Jfera22.

VOOOLAAAREEE~~~ way up in the sky!!

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12-28-2008 05:24 PM  8 years agoPost 5
Heli-on

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Southern Cali, CA -​USA

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I wouldn't use any type of aftermarket CF boom on a T-Rex. Didn't you guys hear about the horror stories of people crashing their 500's because they wanted to save $7 on the aftermarket vs. Align boom? Seems the Align boom for the 500 is metal with a CF sheath over it and one place was selling booms without the metal and the CF was already thinner to begin with. I know it doesn't apply to the 450 here, but lesson learned just the same. The integrity of your machine is only as strong as its weakest link.

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12-28-2008 05:49 PM  8 years agoPost 6
Andy_Johnstone

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Liverpool - England

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for a quick fix you could always wrap a bit of tape around the boom were it goes into the boom block worked for me.

Optifuel, NHP, Revolution Models, CSM Team pilot 2011

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12-28-2008 05:59 PM  8 years agoPost 7
Aaron1100us

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Cedar Rapids, Iowa

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Ok, now I'm kinda scared to use this boom. It sounds like an inferior product. I think I'm going to order the correct boom. I just can't have something that could break on me in flight. Buying cheap isn't always a good idea.

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12-28-2008 06:14 PM  8 years agoPost 8
Aaron1100us

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Cedar Rapids, Iowa

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Ordered the correct Align HZ018 CF boom. With this boom, will I still have to take apart the block and sand it?

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12-29-2008 06:56 AM  8 years agoPost 9
Aaron1100us

rrApprentice

Cedar Rapids, Iowa

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I measured both booms. The Align aluminum was 12.04 mm and the carbon fiber one was exactly 12mm. You would think that wouldn't make a difference. I did manage to get the block apart and sand it. Put it together just to see if it would work. It all seems tight and solid now. I still have the correct Align CF boom coming also. I think I'm going to use the Align boom when it gets here and have this for a back up just to be safe. Looks cool, matches the blades and frame now. New canpy and tr blades should be here soon, should look pretty sweet when its done.

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01-03-2009 05:10 PM  8 years agoPost 10
JFERA22

rrApprentice

MONTEREY,CA

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Tail Boom

.04mm is not very much sometimes they are not perfectly round and will have slightly different dia. in random spots. I don't know about the 500 but the after market tail boom's for the 450 work fine just make sure to get the ones that have the slot allready cut into them,because some do come without the slot but it's no big deal to cut one.you will know if it's tight enough after a few flights!! If you don't want to take the block apart you could always sand the end just a little use a little JB weld to build up the dia. and then sand it smooth to fit.good luck!

VOOOLAAAREEE~~~ way up in the sky!!

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T-REX 450 › Trex 450 CF boom problem
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