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Other › Front bevel gear stripped in flight resulted in a crash :(
09-04-2009 11:24 PM  8 years agoPost 21
merlin3

rrKey Veteran

dayton, ohio

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well just had them strip in the air for a second time, it was being flown relatively easy as well and gears were the best I could get them. There either needs to be better gears or more adjustability in the mesh. I can't even really fly the thing without worrying about the gears stripping.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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09-04-2009 11:46 PM  8 years agoPost 22
thenewguy

rrElite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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How are you setting the mesh? Do you land in grass?

I have found they do not like grass that will. Keep the tail high if you land in grass, it's a lot of stress on these little gears.

Chris

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09-05-2009 12:07 AM  8 years agoPost 23
merlin3

rrKey Veteran

dayton, ohio

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nope never touched the grass with the tail these are literally stripping in flight, that's two sets that have done it, I'll get maybe 10 flights on it then they strip.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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09-05-2009 12:14 AM  8 years agoPost 24
thenewguy

rrElite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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Interesting, can you give us details on how you set the mesh?

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09-05-2009 12:45 AM  8 years agoPost 25
AcidKindred

rrApprentice

Mobile, AL - USA

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I have not had any problems with mine but a friend of mine has. I know he set the mesh properly and has the upgraded transition block.

He flys much harder then I do but he has not had any problems like this before so I'm starting to think that there is an issue with these gears. They do look like they are smaller then the gears on the T-Rex 450 Pro and may be somewhat fragile. Hopefully we can get this sorted out.

It could be the stress on the gears is higher then the Pro for whatever reason...the gear ratio, the energy transmitted to the gears from the tail rotor drive system, or something else.

Regardless, other helis have issues as well and eventually get fixed and I'm sure this will be resolved as well.

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09-06-2009 10:04 PM  8 years agoPost 26
merlin3

rrKey Veteran

dayton, ohio

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flew it once today after repairing but didn't fly it too hard. I noticed when rebuilding that the front bevel gears don't mesh the greatest due to the vertical gear sitting a little too high. I don't know if it's a bad batch of gears or poor design but I decided to shave down the plastic where it meets the bearing and now they meet up perfect and better mesh so we'll see how it holds.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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09-28-2009 11:05 PM  8 years agoPost 27
T-rexn8

rrKey Veteran

CoLoRaDo

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Any updates?

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09-29-2009 04:00 AM  8 years agoPost 28
merlin3

rrKey Veteran

dayton, ohio

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so far mines holding up, still not flying at 100 percent throttle for safety but it's holding up and flying really well.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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10-01-2009 05:03 AM  8 years agoPost 29
tdsounds

rrApprentice

Metairie, LA

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I can't believe that I fallen into this front gear issue. I finally got my Rave flying sweet. Best 450 I ever flown, I was doing a lot of backwards flights aggressively and then decide to do a quick fff pass. The heli spun out of control and I hit throttle hold. The only thing I broke was a landing gear and one link. The front bevel gears were gone. Was fun while it lasted, a whopping 12 flights!

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10-01-2009 05:17 AM  8 years agoPost 30
TonyTypeS

rrElite Veteran

New Orleans, LA & El Monte, CA

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2 Raves down in one day Tom Man your was really rocking on 6s!
Now is a good excuse to go and get the new updated tail support case. Yours has the wide cut slot that goes all the way across. the newer one has a small slit.

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11-04-2009 04:05 AM  7 years agoPost 31
T-rexn8

rrKey Veteran

CoLoRaDo

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This Is A Real Issue

Well mine popped it's gear cherry today.

Piro-reversal's are asking for trouble on this machine if you ask me.

Today while doing what I call "windshield wiper" tic-tocs (where you are doing aileron tic-tocs and switching from nose to the left to nose to the right and switching piro direction too). A lot of collective and tail input at the same time. After about 4 of those the tail let go and my heli went down. Gear mesh was checked before each day out of flying. Even after looking at it after the crash you can see that there was full engagement.

I also found it very strange that there was white dust around the crown gears after the incident.

There is SIMPLY not enough surface area on those gears to be durable on this application. Just look at the 450 Pro design, there is about 3 times the surface area on the crown gears and they sloped the angle a long way to add to the surface are. Smart design and it can take all the reversal's and abuse you can throw at it.

I knew the tail gears where weak but this is depressing, especially after just finishing my flybarless.

I am seriously going to probably retire my Rave's and move on to something else. I.E. my 3 T-450 Pro's.

Too bad cause the heli flies pretty damn good when it's working.

I am going to contact Brian and let me say that he has been very helpful and friendly in the past.

Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano

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11-05-2009 12:59 AM  7 years agoPost 32
JayL

rrVeteran

Leesburg GA

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I dont fly my rave as hard as my pro because im scared of the tail gears. I keep hoping they will come out with stronger gears maybe someone will figure out how to put pro gears into the rave any takers.

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11-05-2009 01:42 AM  7 years agoPost 33
David Aldridge

rrNovice

Austin, TX - USA

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Yup, these things are a real weak link.

I just finished repairing my Rave today (due to bevel gear stripping during spool up after an auto, causing a boom strike and $100 in parts), hovered to check the blade tracking and set it back down to adjust. Tail blades brushed against the grass, and crunch -- the front bevel stripped again.

*sigh* Good thing shipping to Austin, TX is quick...

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11-05-2009 02:37 AM  7 years agoPost 34
ke6d

rrApprentice

San Jose, CA

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I repaired mine after the strip bevel gear in flight a while back and gingerly flying it for the last few weeks. Last Sunday, I had the misfortune to do a low altitude big rain bow on normal mode As soon as the Rave went past 11 o'clock position, I knew the motor was dying so I proceeded to flip it right side up and much as I could. The Rave landed a bit rough on the skid (the main and tail blades did not even hit the grass) but the front bevel gear lost a couple teeth due the hard landing.

It was the only damage. I guess I got away with it cheap this time

My Fleet: T-Rex 700e VBar, T-Rex 600e VBar, Logo 500 VBar, T-Rex 500 VBar, T-Rex 450Pro VBar

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11-05-2009 02:43 AM  7 years agoPost 35
TonyTypeS

rrElite Veteran

New Orleans, LA & El Monte, CA

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Mines stripped out again right before I moved 2 weeks ago. Tried to get a few more flights in before I headed out and the darn front gear stripped out on me. since my last crash I was able to get about 10 flights before it went in.

I was doing piro stops left and right and the tail just stopped working on me. It started spinning really quick so I hit throttle hold and luckily it hit my car so the damage wasnt too bad. Trashed the tail but atleast the frame survived this time. The gears could have broke in the crash but who knows. Right now its in a box. Not sure if I want to rebuild it again. I have been flying my 4s one and so far no problems with the gears but im too afraid to push it too hard.

Wish I would have kept my pro

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11-05-2009 03:13 AM  7 years agoPost 36
JayL

rrVeteran

Leesburg GA

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I really hope they fix the gears because the rave is an excellent flying heli I want to make it flybarless but im not going to put the money in it if it want hold up.

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11-05-2009 04:58 AM  7 years agoPost 37
tdsounds

rrApprentice

Metairie, LA

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Man that sucks,its a shame its such a nice flying machine. Hopefully the issue will get fixed; otherwise I'll give my Rave quits and get a bigger electric as I refuse to fly any other 450 machine even though I know the trex 450 pro has been solid.

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12-22-2009 06:57 PM  7 years agoPost 38
clayboy

rrApprentice

phuket thailand

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i landed a bit careless today and a dsit sound when the tail hit the packed snow. looked ok and took it up did several piros with hard stops , though no problem to auto when in upright, seams to work ok . did a funnel then i lost the tail and came down knife edge , i wounder how many claim the gears broke in flight and had damaged the gears in a bad landing? i know for sure now if it happens again its just to take it apart and inspect them no matter what

i started with nothing and still got most of it left

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12-22-2009 07:23 PM  7 years agoPost 39
Buzzin Brian

rrProfessor

College Station, Texas

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Curtis just got back into town today, and he brought samples of the new gears with him. We should see them after the first of the year. However as several people have pointed out there is no material that will keep the gears from breaking if the tail is struck on the ground hard. If the tail stops abruptly from a strike something has to give. But in flight they are much stronger.

Brian

Build it, fly it, crash it. Repeat as often as needed.

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12-22-2009 09:58 PM  7 years agoPost 40
T-rexn8

rrKey Veteran

CoLoRaDo

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In flight they are "ok"

Like myself and others have stated. If you do any type of tail reversals, especially abrupt left to right they will let go.

Give it a try if you dare

Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano

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