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HelicopterAlignT-REX 700N › I got a screw loose!!
06-02-2010 02:20 AM  7 years agoPost 1
basmntdweller

rrKey Veteran

Indianapolis IN

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Out flying today, I took both my 700N and my 700LE 3G. Third flight on my LE 3G, the bolt holding the right side boom support to the boom clamp was missing upon landing. I guess I was lucky the support didn't rotate up into the blades. I didn't have any more screws with me so I had to park this one. This has happened once before on this heli. It has about 100 flights on it. It was snugged down good after the last time with plenty of blue loctite.
Fourth flight of my 700N I came down was was refueling and noticed the same bolt on this one was just about to fall out.
Anyone ever have this bolt come loose repeatedly? I am guessing I have a harmonic vibration somewhere that is just enough to affect this bolt but no others. FWIW, my 700N has never had this bolt come loose in over 250 flights. It is rather strange they both did it on the same day.
The only difference is I ran out of 30% last saturday and all I could get was some 20%. It seems to run fine after little tweaking of the needles with considerably better fuel mileage! The power is down a bit but nothing I couldn't live with, versus not flying!

Matt


Stupid people have no idea how stupid they are!!!

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06-02-2010 02:23 AM  7 years agoPost 2
george0079

rrElite Veteran

USA

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I had the same problem. I ended up using red locktite, and putting a bridge across the boom supports to dampen the vibs... Hasn't come out since

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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06-02-2010 02:27 AM  7 years agoPost 3
basmntdweller

rrKey Veteran

Indianapolis IN

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I considered a bridge as I have them on all my MA helis. That will likely be next, along with some red.

Matt


Stupid people have no idea how stupid they are!!!

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06-02-2010 02:43 AM  7 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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piece of old boom support or landing gear skid cut to proper length with a zip tie through it makes a great ( and free ) boom support bridge. It'll keep the boom supports out of the blades and keep you from pole vaulting the heli on a landing if/when they come loose.

This is about the only spot on my 700 that has red loctite, bolts on the boom supports. They are big enough for me to to be ok with red there.

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06-02-2010 04:03 AM  7 years agoPost 5
marc8090

rrElite Veteran

Long Island, N.Y.

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Common where I fly. We all use red loctite on the boom supports and tail hub.

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06-02-2010 05:58 PM  7 years agoPost 6
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

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So far I have lost a bolt from a tail support, a bolt from the head just above the Jesus bolt and had the set screw that holds the tail hub on come loose.

The model was inverted when the boom support bolt came out and took a chunk of main blade leading edge with it.

It was only that I read someone elses post about the hub set screw that I checked it. Earlier in the day I had been flying the model and the tail was kind of vague and not holding properly.

Others have come loose but I catch them as I now do a pre-flight every flight on all the bolts.

I am experimenting with Loctite 290 which is medium to high strength.

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06-05-2010 01:12 AM  7 years agoPost 7
brandov2

rrApprentice

az

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I tried red lock tite and mine was still coming loose.. I ended up using ca and has not moved since..If it comes loose again I will try the tywrap and old boom support method..

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06-05-2010 01:34 AM  7 years agoPost 8
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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I had the same problem. I ended up using red locktite, and putting a bridge across the boom supports to dampen the vibs... Hasn't come out since
ditto. Several times at first...

Clean the bolt really good with alcohol, and take a Q-tip, dip it in alcohol, and clean the female threads really good. Then use copious quantites of red loctite.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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06-05-2010 04:30 AM  7 years agoPost 9
knightofcarnage

rrElite Veteran

chicago

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Check your other tail screw happend to me. I fix the support boom but other screws go loose on the tail grip and them nice CRASH.

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06-05-2010 04:14 PM  7 years agoPost 10
BEEP BEEP

rrApprentice

Alexandria, La.

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I got a screw loose!!
Me to !!! Oh you were talking about your 700.

Man this heli is fassssst !!!!!!!!!

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06-05-2010 06:55 PM  7 years agoPost 11
knightofcarnage

rrElite Veteran

chicago

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my poor 700 5th tank =(

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06-06-2010 02:39 AM  7 years agoPost 12
ualdrivr

rrApprentice

Long Island, NY

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Well known problem with the 700. I use red LockTite and a tail support brace.

At the precipice, we change!
Team GrandRC

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06-06-2010 11:13 AM  7 years agoPost 13
RussJ

rrApprentice

lockport, new york usa

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My tailboom support brace bolt fell out on mine too during flight. I used red loctite on it as well and check it from time to time. The little set screw on my tail hub also came loose too once. Luckily I noticed it before I took it up. That would have been bad. Seems we are not alone with these common problems. I will try a bridge across the two support tubes.

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