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Other › Logo 500SE tail rotor and boom problem
01-02-2011 11:06 AM  6 years agoPost 1
jedwards

rrNovice

Phoenix, AZ

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I recently completed building a Logo 500SE and it flys fantastic !

I'm having issues with the boom and carbon t/r case. On my first flight the t/r case rotated on the boom. I tightened it up and on the 8th flight the last 2 inches of the boom broke off leaving the t/r system hanging by the belt ! Fortunately, I was able to auto rotate to a safe landing. I was extremely lucky that the belt was somehow able to continue moving while in the hanging state. I thought that I might have over-tightened the clamps holding the case to the boom and weakened the boom. So, I replaced the boom and made sure that I didn't over-tighten it this time. Within a couple of minutes of some light 3D flying the t/r case rotated. I'm afraid to tighten it up any more for fear of having the boom break again. Has anybody out there had this happen to them? Unless I had a faulty boom I don't see that I have any other choice but to drill a small hole in one of the boom clamps for a holding screw.

Jamie

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01-02-2011 11:13 AM  6 years agoPost 2
Anthony.L

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Seattle, WA

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Subscribed, eager to hear any comments as a new 500 SE owner...

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01-02-2011 11:22 AM  6 years agoPost 3
Smacka

rrApprentice

PA

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We had the same issue with our Logo 600...a small self tapping screw through the boom (through one side of the tube)where the boom meets the main frame took care of the problem, as we found that the entire boom was actually rotating, and not just the tail feathers. The tail feathers being off drew our attention to the rotating boom.

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01-02-2011 11:24 AM  6 years agoPost 4
Anthony.L

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Seattle, WA

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Ok, so he might think the boom is twisting at the tail box when it's really twisting at the frame? I have yet to see anyone pin the tail box to the boom.

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01-02-2011 11:26 AM  6 years agoPost 5
Smacka

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PA

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Yes, I am saying the entire boom is rotating BUT since the tail feathers are off, it makes it seem that the tail is loose

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01-02-2011 01:32 PM  6 years agoPost 6
jedwards

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Phoenix, AZ

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I'm 100% certain that it's the t/r case rotating and not the entire boom. I went ahead and secured both ends of the boom with small screws. I'm going to fly it this morning and will let you know if I have any more issues with it.

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01-02-2011 02:37 PM  6 years agoPost 7
azheli

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Scottsdale, AZ

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See the 500 SE manual - page 5 step 8 on how to secure tail.

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01-04-2011 02:25 AM  6 years agoPost 8
Whatsaflybar

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PA

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I have seen tail booms rotate in the main frames a few time on the Logo 500 and 600. The main cause is one of two things, to high of head speed or something causing vibration.

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01-04-2011 02:44 AM  6 years agoPost 9
jedwards

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Phoenix, AZ

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Regarding vibrations rotating the tail, that may be what it is in my case. My idle-up 2 setting sometimes causes my boom supports to visibly vibrate. My idle-up 2 headspeed is 2050 RPM. Is that too high ?

Thanks,

Jamie

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01-04-2011 03:21 AM  6 years agoPost 10
Anthony.L

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Seattle, WA

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Yeah in that case pinning the boom is nothing more than a "band-aid". You should find the source of the vibrations. bet if you ran the Spectrum Analysis on the Vbar it would be high as well.

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01-04-2011 04:10 AM  6 years agoPost 11
jedwards

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Phoenix, AZ

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Is 2050 RPM too high ?

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01-04-2011 04:13 AM  6 years agoPost 12
OICU812

rrMaster

Edson, Alberta, Canada

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No it is not, 500 can run 2300-2400 with 560mm mains on no issue and no vibes.

500SE can and should be able to run 2300 with 600mm mains and no vibes, same as the 6003D in this respect. You need to source out your vibes as said for sure.

If you feel honestly the vibes are not bad, or non existent, then it is is no issue to pin boom persay with small screw as you mention, but only ensure there are no vibes.

...Once upon a time there were Nitros, flybars and frequency pins...

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01-04-2011 05:38 AM  6 years agoPost 13
Justin Pucci

rrNovice

Bothell, WA - USA

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Another thing to think about is that if you're flying in cold weather (below 40F in my experience), the plastic clam-shell halves on the tail case and the horizontal stabilizer will shrink to the point where the bolt preload has been sufficiently reduced so as to allow the assembly to rotate on the boom.

I've been flying my 5003D and 600SE in 25-35F weather the entire winter and I find that the plastic bits need to be tightened further once the heli is at the field and acclimated with the ambient temperature. The ones you need to be mindful of are your main and tail rotor grip bolts and the horizontal fin and tail case clam-shell bolts. You couldn't budge my horizontal fin assembly at room temperature, but at ~30F it'll rotate with one hand and a bit of muscle.

Also, a word of warning...loosen them again before you put the heli back into your warm car or house or else the plastic will expand and crack...

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01-05-2011 02:47 PM  6 years agoPost 14
Gav Lan

rrNovice

Brighton England

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hi all,i had the same tail problem with my 500se on my very first 3d flight,i too thought i must have not tightend the tail clamp bolts fully so i nipped them up tight,this then put side pressure on the tailbox bearings and caused them to get hot after a 5min flight.i ended up drilling a very small hole in one clamp and put a small self tapper in,i also loosen the bolts slightly to release the bearings,the front of the boom i had pinned in as per the manual.i have now done about 50 very good flights like this with no problems at all.

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