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T-REX 500 › belt loosening
01-15-2009 11:50 PM  9 years agoPost 1
FlaG8r

rrElite Veteran

Florida

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I believe my tail belt is getting slightly looser after a few flights...I've heard of this issue before. I'm running it pretty tight right now and I feel that I've cranked the bolts into the nylon nuts pretty good.

What are the options to fix this besides TT?

Life is tough, it's tougher if you're stupid

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01-16-2009 12:01 AM  9 years agoPost 2
Gravitysucks

rrApprentice

San Diego, CA

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Edited: This is for metal tail rotor housing

The only thing that should determine the belt tightness is the tail rotor housing. The front of the boom should slid into the tail block until is stops. Then tighten the tail block bolts up snug. Adjust the tail rotor housing to the correct belt tightness (not too tight) and tight up the adjustment bolt. It should hold just fine.

Sometimes I like to put a little of the green bearing glue (R48 Anearobic Retainer) that comes with the kit onto the boom under the rotor housing to provide a little friction to keep the rotor housing from sliding at all.

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01-16-2009 12:02 AM  9 years agoPost 3
tacoturbo

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Kauai, Hawaii

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I have the same problem with mine. Several suugestions that came my way when I posted the same is either to pin the tailboom with a very small selftapping screw (non-adjustable)or use the upgrade alloy tailservo clamps and snug it up to the boom mounting block so the boom cannot slide any further in. All you need to do then is readjust the linkage some. I pinned mine but just got my alluminum clamps and will do those. I evem roughed up the boom surface but it still slipped.

TT

I don't do 3D....no wait. Oh thats right, I can't do 3D!

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01-16-2009 12:06 AM  9 years agoPost 4
tacoturbo

rrApprentice

Kauai, Hawaii

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The only thing that should determine the belt tightness is the tail rotor housing. The front of the boom should slid into the tail block until is stops. Then tighten the tail block bolts up snug. Adjust the tail rotor housing to the correct belt tightness (not too tight) and tight up the adjustment bolt. It should hold just fine

How do you adjust the belt from the tailrotor housing when it has molded in pins that indexes with the hole in the tailboom? From what I see all belt adjustments are done at the frame mounting blocks.

TT

I don't do 3D....no wait. Oh thats right, I can't do 3D!

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01-16-2009 12:10 AM  9 years agoPost 5
Gravitysucks

rrApprentice

San Diego, CA

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It's the bolt immediately across from the tail fine. You can slid the housing fore and aft until you tighten that bolt. This is the correct adjustment point, not the tail block.

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01-16-2009 12:20 AM  9 years agoPost 6
ckoelliker

rrElite Veteran

St. Simons, GA

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It's the bolt immediately across from the tail fine. You can slid the housing fore and aft until you tighten that bolt. This is the correct adjustment point, not the tail block.
You obviously have never used the plastic tail case on the 500. It is not adjustable on the tail boom. It has a molded plastic pin that fits into the round hole that is on that side of the boom. Now granted the metal tail does not have this and you can adjust the belt tension with the tail case but then you need to readjust your tail linkage to your tail servo.

I put a small piece of clear packing tape around the boom where it fits into the tail block. It does not move any more. Also be careful you can break the boom block if you try to over tighten. I cracked mine around the "holders" for the nuts. It is fine and usable, but I tried to just crank it down tight, before I used the tape.

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01-16-2009 12:27 AM  9 years agoPost 7
Gravitysucks

rrApprentice

San Diego, CA

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My apologies, you're correct I was talking about the metal housing not the plastic.

The tape around the boom sounds like an excellent solution--very simple and still retains adustability.

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01-16-2009 12:30 AM  9 years agoPost 8
FlaG8r

rrElite Veteran

Florida

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Is clear packing the prefered tape? How far down the boom do you apply it? I assume it goes right on the end...how far down does the tape go? Just enough so it covers the end of the boom that goes into the heli?

Life is tough, it's tougher if you're stupid

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01-16-2009 12:37 AM  9 years agoPost 9
ckoelliker

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St. Simons, GA

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That is all I did.

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01-16-2009 12:54 AM  9 years agoPost 10
blade slayer

rrApprentice

Maryland

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the best thing you all can do to fix that problem is get a TT .I had the same problem and I got the TT and the problem is gone !!!

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01-16-2009 02:19 AM  9 years agoPost 11
tacoturbo

rrApprentice

Kauai, Hawaii

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Not everyone can or wants to spend the extra scratch on the TT. I personally prefer the belt as its way more forgiving if you have the occasional blade scrape. Yes the belt can be a pain but once you get it sorted it works just fine.

TT

I don't do 3D....no wait. Oh thats right, I can't do 3D!

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