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Home✈️Aircraft🚁Helicoptere-CompassAtom 7HV › 7hv main gear stripped
03-27-2012 12:10 AM  7 years ago
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raptormandan

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springhill florida

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7hv main gear stripped
any ideas....4035-560 motor.... vbar...mesh is perfect... it happens when i do half piro.....pinion seems fine...2nd time if done this in 50 flights....same spot...just one tooth...running 2000 headspeed
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03-27-2012 10:01 AM  7 years ago
raynman

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Lyall Bay - Wgtn - N.Z

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The main gear is not slightly warped? This is easy to see by cranking up the motor and keeping an eye on the main gear spin - it should run perfect strait and level - any slight wobble of the main gear can cause this or defect and stress the material of the main gear causing a strip.
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03-27-2012 10:37 AM  7 years ago
raptormandan

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springhill florida

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gear
ok i will check new gear tonight
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03-27-2012 01:50 PM  7 years ago
Rob43

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Midland, MI USA

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I went through about 3 gears last summer. The assignable cause was found to be a misalignment condition. It happened rather easily due to some accumulated loctite in the frame slots. Juts make sure they are very clean. I used a small round file to clean mine out. I actually took my gears to my company's materials engineering lab and had them examined. I have pics of the wear pattern enhanced by precious metal coating over in my album on the 'Freak'. PM me if you need more information.Rob
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03-27-2012 11:23 PM  7 years ago
TheBum

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McKinney, TX

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Are you talking about the motor mount slots, Rob?Alan
Team Shannon (Only Fine Helis)
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03-27-2012 11:58 PM  7 years ago
daveketelhut

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canton michigan

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anytime i have ever seen a main gear lose 1 tooth its because the gear mesh is to tight in that spot. the main gear pushes against the pinion in that high spot and pushes the teeth apart resulting in 1 tooth popping off. when i install my main gear i check the mesh about ever 5 teeth. it might be perfect in 1 spot but not all in all spots.Team take it easy
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03-28-2012 12:59 AM  7 years ago
raptormandan

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springhill florida

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7hv
hey dave this is dan...i was parked next to you at the blowout with dave from elite.....u know, i never check all around the gear. i will now...thanks
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04-02-2012 04:08 AM  7 years ago
renwick56

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Tampa, Florida

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Main gear able to rock?????
Have any of you noticed a persistent issue with the main gear on the 7hv able to rock back an forth, if you were to hold the gear on opposite sides, and move it that way?

That is how mine is, and what issue can/will I experience because of this?

I am posing this question, as I may have an issue. I flew my 7hv on Saturday, and it was perfect. Steady and solid as a rock. Took it out today, and I noticed a high frequency vibe in my tail fin, and nowhere else. Then when stopping from a fff pass, as I brought the heli into a hover, I notice a sudden "kick" in the tail. Like the heli "skipped a beat".... I thought that it had skipped or broke a tooth in the belt. Have not seen one. Is this connected to the buzz in the fin? What should I check/inspect???

All help is appreciated..

R
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04-02-2012 06:59 AM  7 years ago
RAK402

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Alhambra, CA

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renwick56,

Is your tail boom grounded?

My 6HV did this until I grounded the tail boom to the motor mount.
Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep
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04-02-2012 12:21 PM  7 years ago
renwick56

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Tampa, Florida

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Yes
I grounded it, using the method and materials included in the kit.
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04-02-2012 01:32 PM  7 years ago
raptormandan

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springhill florida

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gear
after setting gear mesh on high spot.HELI was great no teeth missing after hard piros...thanks Dave kettllehut.....rmd
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04-06-2012 01:52 AM  7 years ago
Rob43

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Midland, MI USA

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Sorry I failed to respond, Alan.

I was referring to the (4) slots on both sides of the heli, to which the motor mount attaches. The slots permit fore/aft movement to adjust gear mesh clearance (backlash). I know Dave has more insight on this than I since he's seen many more of them, and, his suggestion makes perfect sense.

However, in my case, there was unmistakeable visible evidence of misalignment. Imagine that the motor shaft is for some reason not parallel to the main shaft. I concluded my motor mount was either deformed for some reason, or was crooked in the frame. Then, I found a bunch of loctite.

It's sure been great since cleaning out the slots!

What I need is a CMM for when I build
Rob
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04-06-2012 04:47 AM  7 years ago
Band1086

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Kennewick, Wa. USA

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You guy's that are stripping main gears, what size pinions are you running? It makes a difference.
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04-09-2012 10:26 PM  7 years ago
Alexm0324

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Atlanta, Georgia USA

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The newly released manual recommends a 14 Tooth pinion citing that it is to relieve stress on the gear. I wonder if the newer kits will start shipping with a 14 Tooth pinion. This would also change the stock gear ratio.
I have run 12 and the stock 13T and had gear strips and never really figured out why after thinking I worked it out. I'm going to try a 14 tooth revco pinion soon, but need to get a lower KV motor first.
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04-10-2012 12:21 AM  7 years ago
raptormandan

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springhill florida

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gear
i was hammering my heli this weekend hard half piros...after setting gear mesh on the high spot i have had no issue with tooth missing...rmd
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04-10-2012 05:55 AM  7 years ago
Band1086

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Kennewick, Wa. USA

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The amount of power your motor has and how hard you fly also make a big difference. For instance, running a Pyro 700 VS an Xera 4530 will make a vast difference if you fly hard. And of course the harder you load the disc, the harder it is on the gear train. That's where the bigger pinion becomes important.
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04-10-2012 06:09 AM  7 years ago
RappyTappy

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Encinitas, CA

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You definitely have to set the mesh on the high spot on any model. As the gear gets going it gets hots and expands. I always run just a hair of backlash on any gear, basically the point at which you can 'feel' the backlash but at 3-4 feet away can't physically see the gear move. I also use bicycle chain wax on the electrics which helps to lube the main gear like nitro helis automatically did but without attracting dirt. I used a temp gun on the gear with and without lube and the main gear for sure comes back cooler than without the lube.
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04-10-2012 10:40 AM  7 years ago
raptormandan

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springhill florida

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gear wax
im gonna try that wax....im using white lithium now..i like the idea of not attracting dirt...i was setting gear mesh in one spot...using paper method..now i do it on high spot and then all around gear... the things you learn ....rmd..
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