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500 Class Electric Helicopters 500 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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01-20-2008, 12:24 AM | #1 (permalink) |
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Join Date: Jul 2006
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3400G stripping in flight?
how many have stripped their 3400g cyclic servos on their 500 or have known, seen or heard about this?
while i am at it, for those changing to metal or have changed to metal, im wondering how you got the large metal gear that comes stock on a 3400g. i appreciate the help jason |
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01-20-2008, 01:07 AM | #2 (permalink) |
Join Date: Dec 2007
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Jason,
while in no way can I ever do what you can do.....I have the z3650's.... somehow there seems to be a variety of issues...with respect to the TR500..given that it is a little bigger than the TR450.... If one is stripping gear trains simply by performing hard 3D, then there is a problem.....if there is an issue that could be attributed to the lack of proper design of BEC's to provide the current necessary under load....because the manufacturers FAIL(and they have failed pathetically in this respect) to provide the proper specs on current under load....then how in HELL are we able to determine what BEC to use....heck the BEC manufacturer's can't even design properly...... The dang JR/Futaba/Hitec had get off their butts and provide proper specs.....so that when I call them.....on my own nickle...and I get some dumbass that has been given the company line(great planes service center) ...that get this....BEC's are only spec'd for voltage......upon asking questions, he explains the "he's not an electrician".....an electrician?????????? I can only assume, from an engineering point of view, that if you Jason are stripping gears...than the load imposed on such servos renders such servos as useless....and JR/Futaba...et all had better get their act together and at the very least provide load specs....and even test their own servos to such specs before throwing them out for public consumption.... Great Planes...the Futaba service center...claims that ALL their servos draw between 1 and 2 amps...if that is true, then the BEC's on the current market can't cut the mustard......because of this garbage, I will just design my own BEC |
01-20-2008, 08:31 AM | #3 (permalink) |
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Jason
For your 3D is the DS3421 to slow they are stronger but slower ,, I do not fly like you but they are working great for me
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01-20-2008, 08:43 AM | #4 (permalink) |
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Dang HeliBurn's you got a stronger opinion Talk about a rant.... Welcome to the world of "hotline support" these days. Also what has the BEC got to do with Jason's ask about gear stripping?
Jason there has been some reports of a 3400G stripping in flight. Usually on the elevator servo. Because of this some have questioned if it was because they had set for max throw and the elevator servo arm was hitting the anti-rotation bracket at high positive pitch and forward elevator input. There was a post a few pages back by Leon Luke about this and a mod he made to his servo arm. Personally a few reports of failures in flight is enough of a HINT to me to worry a little about it and get metal gears. Although the jury is not out (no real facts here)and the torque specs seem more than adequate, it doesn't make sense they would strip. Still piece of mind going metal certainly cant hurt! Bob
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01-20-2008, 08:53 AM | #5 (permalink) |
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I have striped 2 in flight. as far as changing the large metal gear you can leave it an just change the rest. If you must change it put a HD round horn on it an pull it straight off.
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01-20-2008, 08:55 AM | #6 (permalink) |
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SmokinJoe, which servo? Elevator? Have you checked that your elevator servo arm is not hitting? More data please... We want to understand which servo and why as best as possible.
Bob
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01-20-2008, 09:32 AM | #7 (permalink) |
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It was elevator once and pitch the other. My elevator will bind but only at full negative and full elevator. Witch never gets used like that in flight. The weird thing is these things seem pretty strong in a crash. When I had the lock out I broke links and servo cases but the gears were fine.
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01-20-2008, 09:37 AM | #8 (permalink) |
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Interesting.... Well your the 3rd person to have this happen that I am aware of. I am sure if this is a problem we will hear more about it. I wonder if maybe people moving the servos by hand e.g. folding up blades etc, may be weakening them? I am trying to find a reason as again the specs if accurate this should not be happening.
I mean if the 3400G is stripping seems like the 9257 with all nylon gears would too? Unless there is a design problem internally or something? Bob
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01-20-2008, 04:30 PM | #10 (permalink) |
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thanks for the info, bob, im definitely changing to metal gears when it is available and back in stock for me. leon luke said the same thing about stripping the elevator servo and perhaps the anti-rotation bracket contributed to it. either case, im changing it!
for pulling the gears out though, i noticed a difficult time removing the main metal gear one, this is kinda tricky part i need help with! thanks jason |
01-20-2008, 08:38 PM | #11 (permalink) |
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Jason sorry I have never done this on a 3400G... However like other servos, It is usually well pressed on the pot shaft. Your going to have to pry it off as carefully as possible.
Bob
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01-20-2008, 10:30 PM | #12 (permalink) |
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i was thinkin the same thing, the 9650 and the 9257, both have plastic gears also???
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01-20-2008, 10:33 PM | #13 (permalink) |
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Jason, I've change th 3400 before, the main gear is tight because it's almost a press fit on the top bearing. You just have to push a little harder (straight downward), it will come out. I've also heard that Alan S. stripped his 3400's in flight at the AMA show a last week.
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01-20-2008, 10:50 PM | #14 (permalink) |
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hey thanks kevin. btw, hows your 500s going, hehe.
jason |
01-20-2008, 10:53 PM | #15 (permalink) |
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i heard he taco his metal main grip from the last crash
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01-20-2008, 10:59 PM | #16 (permalink) |
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Old news.:wink: Repaired and fixed. Got my flybarless tune perfect! Got a lot of fights in on Sat. I'm going to move my Scorpion motor to the flybarless and I will have the perfect setup.
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Kevin Don't Taco My Pack, Bro! , Why crash when you can POUND it! |
01-21-2008, 12:42 PM | #17 (permalink) |
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I put my 500 in using the 9650's. It was during the upright stop of a big Rainbow. I was running a heavy pack (620g) and it just kept going on reversing the Pitch.
At the time I considered my blades had cavated due to the weight although I have never experienced it to such an extent. I even had enough time to shout I had a problem! Guess what the Pitch and Ail gears are stripped out..now whether this is from the ensuing crash I cannot confirm, but I was pretty damn sure it wasn't me at the time. The Radio was my speccie DX7/AR7000 which I have had 1500+ trouble free flight and continues to work faultlessly. So just maybe the gears blew out on me..anyone else experience this with the 9650's? cheers Brian |
01-21-2008, 12:58 PM | #18 (permalink) |
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Hmmm I dont know but considering the many people that have used 9650's on a Logo14, Trex600 with HFE frames, and not reporting stripping in flight, it's hard to think they would strip on a 500?
Bob
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01-21-2008, 02:33 PM | #19 (permalink) |
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Bob,..Thanks for the heads up on the servos being capable enough then
I just can't see the blades cavatating that much. the model must have travelled 15+ feet..I'm running a DC-UP so V was good to the Rx + it went to hold.. I'm stumped on this one. |
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