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Home✈️Aircraft🚁HelicopterAerial Photography and Video › GSR260 tail boom supports
01-15-2006 03:54 AM  13 years ago
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aambrose

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Pana, IL

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GSR260 tail boom supports
Has anyone ever had this happen? The bolt holding the tail boom supports to the tail boom sheared. Any ideas what may have caused this? Haven't had any hard landings or banged it around on anything. Would the colder weather and vibrations be a factor?
Thanks!
Bolt:

Under side of tail boom where supports attach:

Tony
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01-15-2006 03:56 AM  13 years ago
uh60ce

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Atlanta Idaho USA

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overtightening it? that could cause that to hapen. was there any signs of it being loose before it broke? posibly just fatigue caused it to break since its under a bending load all the time the way the suports spread out.
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01-15-2006 04:00 AM  13 years ago
aambrose

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Pana, IL

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Honestly, I have not given that spot much notice lately. Just noticed a few minor tail kicks while flying this afternoon. I have been flying this heli since last March and the bolt has not been touched since the day it was built.

Upon removing the broken bolt, I didnt see any signs of dust or residue.

Thanks!

Tony
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01-15-2006 04:02 AM  13 years ago
uh60ce

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mabey it was just its time to go...at least it hapened on the ground...I hope! Ive had one rattle loose before and it wasn't pretty..no damage other then bending the suport though luckily.
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01-15-2006 05:16 AM  13 years ago
Dakine

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Vibration and stress point?
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01-21-2006 08:50 PM  13 years ago
aambrose

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Pana, IL

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I was out testing my tail drift problem and this stinkin' bolt broke again! I'm at a loss as to why. Colder temps? I don't see any unusual vibrations. Anyone else with GSRs having this problem?
Tony
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01-21-2006 09:30 PM  13 years ago
Brett Horton

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not had that problem, weird!!
must be some strange harmonic going on?
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01-21-2006 11:40 PM  13 years ago
AirFoil Aerial Systems

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Tony
Do you have a holder between the struts? When its cold they are going to become very rigid and could lead to what you are seeing. I have never seen that bolt break winter or summer so I'm at a loss if thats not it.

The really odd thing is the only thing it goes through is plastic? Doesn't make any sense unless you don't have a holder then maybe.
One other thing is the tail belt shrinks in the winter and if it was really tight it might cause major stress on that bolt?

Hope this is of some help.
John
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01-22-2006 03:38 PM  13 years ago
aambrose

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Pana, IL

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John,
I'm assuming you're talking about the 3 plastic/nylon spacers where the struts bolt to the tail. If so, I have since replaced each of the 3 spacers with rubber ones. If you're referring to the cross piece between the struts about midway, then yes, I have that in place.

One tank of gas with the rubber spacers and it's still holding. Between this and the tail drift, I'm pulling a few hairs out. I admit I havent flown the GSR for a while because family stuff has occupied a lot of my time lately, and this is the first time the GSR is seeing some colder temps. It has been extremely reliable so I guess when things like this and the tail drift creep up, I'm surprised.

Thanks!

Tony
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01-22-2006 04:59 PM  13 years ago
AirFoil Aerial Systems

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Since you replaced the gyro foam and have the strut brace and said you haven't flown the heli in the colder temps maybe its the carb not being set for winter. Check the plug and see if its black or brown. Open the low speed needle about a 1/16 along with the high speed until you see a dark brown. In the winter you always want a dark brown or black plug reading. I think you talked once about foam in the tank and this may also be why.

Just something to try.
John
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01-23-2006 05:49 PM  13 years ago
aambrose

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Pana, IL

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Thanks John. The last time I checked the plug was in October and it was tan (brown?). The exhaust port was blackened. I havent touched the carb settings since I picked the heli up from you last March. Is that not a good thing to do? Is there a general timeframe when you change the carb settings for fall/winter then back again for spring/summer?

The gas in the tank is always bubbling/foaming -- always has that I know of. The 90° fitting on the return is a MUST IMO. Havent had a leak since and flight times are much longer.

Thanks again!

Tony
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01-23-2006 06:00 PM  13 years ago
AirFoil Aerial Systems

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Tony
Check the plug and let me know the color now. We generally have to change settings about twice a year one above 50 degrees and one below 50 degrees if it hits 0 then I will generally richen it up even more.

John
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01-23-2006 06:40 PM  13 years ago
aambrose

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Pana, IL

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John,
I'll have to pull the plug tonight (heli isnt with me right now). I'll send you a pic.
We generally have to change settings about twice a year one above 50 degrees and one below 50 degrees if it hits 0 then I will generally richen it up even more.
So these changes are only 1/16th turns at a time? Do you adjust, fly, inspect the plug, and adjust more if necessary? I'm sure this is a "Gas Engine Tuning 101" issue, but I've never tinkered much with these engines before -- only glow (and Rotax ).

Thanks!

Tony
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01-23-2006 07:54 PM  13 years ago
aambrose

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Pana, IL

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Just thinking about this again. I had to slightly turn the tail brace clamp (where the boom supports attach to the boom) so that the screw holding the supports would not interfere with the TR pushrod tube. Anyone else with the GSRs dealing with this? I've noticed the bolt head has rubbed the pushrod tube and worn it a little over time.

Thanks!

Tony
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01-23-2006 08:10 PM  13 years ago
Brett Horton

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aambrose,
what mod are you doing to the tank again?
explain to a dummy!
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01-23-2006 08:41 PM  13 years ago
aambrose

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Pana, IL

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PM sent.
Tony
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01-23-2006 09:17 PM  13 years ago
AirFoil Aerial Systems

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When we start winter flying I generally end up about an 1/8 turn richer on the low and high needles. Its like sommer once their set you can fly all winter then when spring gets here and you are a little rich just take it in a 1/16 and see if it smooths out if not go another 1/16.

The GSR has way more power than needed so always stay on the rich side.

John
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01-23-2006 09:20 PM  13 years ago
aambrose

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Pana, IL

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Thanks John. I will try this next.
Tony
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