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HomeAircraftHelicopterAerial Photography and Video › Trade in my trex?
03-10-2008 02:21 AM  10 years agoPost 1
_architorture_

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Tampa, Florida

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I just got my helicommand sorted out and took out my trex 600 this afternoon to do some test flights with the new system. I flew a whole pack, mostly FFF and some hovering to check the effectiveness of the helicommand. Everything was working really well, I had just eliminated a vibe in my tail fin, and it was flying very well. I was planning on taking it up on another flight with the cam mount attached.

I brought her in about 10' above the ground and held a hover for about 30s to double check my trims when the machine pitched sharply to the right then spun end over end into the ground.

I am an experienced pilot, this was not pilot error. I had no idea what happened. Luckily, I was low to the ground and it was over some sugar sand at a construction site, so the damage was minimal. Blades, shafts, main gear, etc.

The worst part about crashing for me is if you cannot locate the cause, which I could not for awhile. After inspecting the heli, I noticed that I was missing both short linkages that attach the main blade grips to the mixers. I went over to the crash site and both were laying on the ground. Upon further inspection, one end of the linkage had a fairly deep cut that severed the link at the top. After thinking about it some more, I placed the linkages on the heli and it appears that the lower ball link came off the ball in flight, then the sudden change in pitch caused the top ball link to make contact with the head button, causing the deep impact mark. All of this is just background info to my real question.

Should I repair my trex, sell it, and buy a logo 600? I had just gone over the heli yesterday from head to toe, set the pitch, tracking, etc. This machine does not even have an hour of flight time on it. There is no evidence of slop on any other ball link. I would have noticed a faulty ball link. I really like the trex, but everyone commenting on the quality of the machine has really got me concerned. If I had my camera on the bird, this could have easily been a $1000 crash, just because a faulty ball link.

I know there are maintenance issues with any heli, but in your opinion, would I have better luck with a logo as far as reliability? I really would be devastated if this had happened on a job, not to mention if it had happened yesterday when I was checking my blade tracking, or doing test hops next to my truck in the driveway, etc.

If both machines are maintained to the same standard, will issues like this be not as common on a Logo?

FYI- Another reason I am thinking about bailing on the trex is that I have not invested too much money in 6s 5000 packs. I only have one and was just getting ready to buy 2 more, now that I am almost fully setup for AP, I could buy 10s packs instead for a logo. The idea of being able to stretch to a 700+ with the logo also gives me some room for growth.

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03-10-2008 02:46 AM  10 years agoPost 2
trackhead

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utah

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I've flown my all stock Trex for over a year with no problems, ever. Can't speak for Logo's. Never flown one.

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03-10-2008 02:57 AM  10 years agoPost 3
nooobs

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03-10-2008 03:27 AM  10 years agoPost 4
trackhead

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utah

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No problems... except when it fell today from a table tail first... DOH!
I 'crashed' mine earlier this winter when the blades were folded back and the heli on my back. Tumbling down a couloir with skis on doesn't do wonders for the heli. Worst crash yet.

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03-10-2008 03:36 AM  10 years agoPost 5
_architorture_

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Tampa, Florida

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well that is good to hear. I have never been the kind of person to spend money for the hell of it, but I just didn't know if this was something that may happen more frequently. I guess I'll just rebuild and go from there, I'll always just have it in the back of my mind that one of these ball links could let go at any moment....

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03-10-2008 03:44 AM  10 years agoPost 6
Brady Longmore

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Idaho Falls, ID

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It sounds like maybe you had one of those "one in a million" type occurances. I certainly haven't heard of this being a chronic problem with any helicopter. This probably could have happened just as easily with a logo as it did your Trex. If it happens again though...you might have some kind of issue going on.

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03-10-2008 03:45 AM  10 years agoPost 7
RockinRyan

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Yarmouth, Maine

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I own both a 10S Logo 600 3D and a pair of TR600's. I believe the quality of the Logo to be far better, but hard to say if that extends to the ball links! The Mikado parts easily cost twice as much, maybe three times that of most Align parts, but if you're not likely to be crashin' that's a non issue.

The reason for my post is to say that I believe 6S to be too small of a battery configuration to properly support a 600-sized bird. The amp draw is just too high and it seems to really beat the hell out of those little 22.2V packs. You can go to an 8S or 10S TR600 setup - there are a handful of decent motors that can fit in the stock frame...

If I were in your shoes I too would be questioning the logic in purchasing another pair of new 6S lipos - unless I were sticking them on something more like a Logo 500...

One last comment. Anytime I go a while without being able to fly it - each time I fly that Logo 600 3D - I say to myself "what a nice flyin' heli that is..." It definitely is a much more refined heli over the rexy. I'd just hate to get in a place where I were crashing it a lot! Death by parts cost for sure. The Align is what I would try new tricks with - at least at my fairly novice skill level. Two main shafts for $11 vs one hollow SS Logo shaft for more than $30! ouch! But I'm happy to fly it within my comfort zone and do notice and appreciate the increase in quality and precision.

For what that's worth... good luck with your next step.
Ryan

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03-10-2008 04:16 AM  10 years agoPost 8
dhotamis

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Los Angeles, Ca, United States

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I had the same ballink problem and crashed my T600 I changed the parts and it works rock solid, I do nor think Logo will make a lot of difference in your purposes. How ever if you want to learn more about the Logos PM Jag72, he is a friend of mine who owns 4-5 logos in many sizes and just made a 700 Logo so he will be helpful.

Best
Deniz

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03-10-2008 05:20 AM  10 years agoPost 9
_architorture_

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Tampa, Florida

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I was also starting to think that this is a once in a million type thing that happened. I decided to put the trex back together and fly it for the time being. I will definitely be looking into a logo eventually though.

I just started getting into AP, but I've been flying for a few years now, so I don't have many crashes, this is my first in almost a year.

Ryan- you made some good points about the logo, I've been looking at them and from what I hear they are really nice birds. A 600 or maybe stretched 700 is definitely on my wish list.

Deniz- It's reassuring to hear that your experience with the ball links only happened once. I'm not too concerned if it's just a freak thing, I know crashes happen, but if it's something that I can avoid with a higher quality machine, I'd rather do that then be rebuilding my Trex from a crash again.

I'll give the trex some more time, I've really liked it up until this point.

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03-10-2008 07:05 AM  10 years agoPost 10
nooobs

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03-10-2008 08:27 AM  10 years agoPost 11
sean911sc

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San Diego

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True. Align is supplied by most LHS. If you plan ahead spare parts aren't an issue (fxaeromodels.com). IMO go with the Logo. It will almost always come down to personal preference and budget. I personally sold my Align helis in favor of the durability of Mikado. I almost went with the Maxi Jokers.

Your tail vibration comes to mind. My T600 vibration became evident after mounting a AskMan. My T600 was basically a sport flyer with no crashes – that’s what the T450 was for. So I opt for L600 3D, which from the start didn’t exhibit the same vibration issue. The main/tail blades, servos, and gyro are from my old T600, while the motor and ESC are from my L103D. The newer Logo is more rigid with fewer parts.

Question – are you running belt or torque tube?

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03-10-2008 09:05 AM  10 years agoPost 12
nooobs

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03-10-2008 10:08 AM  10 years agoPost 13
sean911sc

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San Diego

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nooobs - my mistake. The question (belt or torque tube) was intended for architorture_.

Well the AskMan isn't vibrating on the L600. So something was off on the T600. I didn't reinstalled the belt drive to see if the torque tube was at fault. I simply put the T600 tuning time I've would of spent into a fresh L600 build.

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03-10-2008 01:36 PM  10 years agoPost 14
_architorture_

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Tampa, Florida

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I had a belt, but I switched over to the tube. I never did find out what caused the vibration, just kind of went away as I tried different things, but never narrowed it down.

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03-10-2008 01:57 PM  10 years agoPost 15
Torsten

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Germany

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just for your info, i fly a logo 600 with 650 m blades and 6s.

so no need to change your packs if you stay around a auw of 11 to 12 lbs.

t

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03-10-2008 03:00 PM  10 years agoPost 16
_architorture_

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Tampa, Florida

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What is the performance like on 6s? Are you using 5000 packs?

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03-10-2008 03:13 PM  10 years agoPost 17
Torsten

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Germany

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flies like a pregnant humpback whale.

i use xcell 4300 packs and use 1800 mah during a 5 minute flight.

i use a 13 tooth pinion and a kontronik tango 45-08. about 1550 rpm.

works well for me.

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03-10-2008 03:48 PM  10 years agoPost 18
Louisiana Helicam

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West Monroe, LA

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I've used a TRex 600 for my aerial business for well over a year now with no issues that pertained to the kit itself. I fly at least 2-5 jobs per week and fly 3D every Sunday at my local flying club field. It's a fine machine. I do believe you experienced one of those rare occurrences.

www.louisianahelicam.com

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03-10-2008 07:12 PM  10 years agoPost 19
_architorture_

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Tampa, Florida

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Torsten- did you use A123 packs at one point? Would they be a good fit for the logo 600? Also, I'd love to see some pics of your logo setup with camera gear, I was following your thread awhile back, but I never saw the finished pics.

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03-10-2008 11:34 PM  10 years agoPost 20
Torsten

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Germany

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nope, i did fly the logo 20 with 8s2p konion 1600 and that worked well. no fepo´s so far.

there are no pics of my work helis online anywere

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