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05-11-2011 12:30 AM  7 years agoPost 1
husafreak

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Livermore, NorCal

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Someone posted a long piece on how to set the gear mesh on a Rave 450, anybody have a link to that? I have about 1/8" of play at the end of the tail blade. I think my mesh is good but on the loose side of good. Only flew it once so far. Just a little high freq vibe in the tail.

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05-11-2011 01:07 AM  7 years agoPost 2
Jgatorman

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Birmingham, AL

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I belive it was skydancer

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05-11-2011 01:29 AM  7 years agoPost 3
mystar60

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Clifton, NJ

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re: Skydancer's method for setting the gear mesh
here is a copy of his post:

Here's how I like to set the Tail Rotor gear lash:

First, remove the tail boom from the model (leave the boom clamps tight on the tail boom).

Next, remove the front tail transition support on the front of the tail boom clamp.

Now, check to see if there is any end play on the tail rotor output shaft in the TR gearbox. If so, use shims to eliminate the end play.

Now, check to see how much clearance is in the bevel gears in the tail rotor gear box. If it seems like too much, first remove the 2X10mm allen screw that pins the TR gear box to the bottom of the tail boom (step 5-2) and then loosen the 2X6mm allen screw that clamps the tail rotor gear box to the tail boom. Now, just move the tail rotor gear box in a little on the tail boom to tighten up the gear lash then retighten the 2X6mm screw on the clamp.

Then, I like to spin the tail rotor using my finger on the front bevel gear on the torque tube. It should be very smooth without any binding and have a little gear lash (plastic gears don't wear in). When it's smooth reinstall the 2X10mm allen screw that pins the TR gearbox to the tail boom.

Now, reinstall the front tail transition assembly. Check the clearance between these bevel gears. If they seem too loose, loosen the front tail boom clamp screw (on the bottom) and slide the front tail boom clamp rearward. This is how you adjust the gear mesh on the front bevel gears.

Now, spin the TR assembly again using the 24T flat gear and all should be smooth (no irregular drag) and you will have a little gear lash.

Once the front bevel gears have been adjusted the clamping screw on the bottom of the front tail boom clamp should NOT be loosened again.

Now, reinstall the tail boom and tighten up all screws. Check to see if there is very much clearance between the 24T flat gear and the 100T tail drive gear. To set the mesh on the 100T/24T flat gears, loosen the 4 screws holding the "front" tail boom clamp to the side frames, and the single clamping screw on the bottom of the "rear" tail boom clamp. Now loosen the 2 horizontal fin screws (which holds the clamp for the tail boom supports to the tail boom and then pull the tail boom rearward to loosen the mesh between the 100T/24T flat gears. If for some reason this does not give you enough clearance (it does in my case) you might try enlarging the side frame holes for the "front" tail boom clamp (only) to allow the front tail boom clamp to slide rearward between the side frames in order to loosen the mesh between the flat gears.
The tail drive system should run smooth and the tip of my TR blades move back and forth about 8mm (accumulated play).

Just take it one step at a time, it will be easy....

Don C

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05-11-2011 08:02 AM  7 years agoPost 4
husafreak

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Livermore, NorCal

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Thanks! I'll print that out and follow it but it sounds like I'm pretty close.

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05-21-2011 02:16 AM  7 years agoPost 5
husafreak

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Livermore, NorCal

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Well I didn't get it right, on my fourth flight I was starting to push it a bit and the black 3D bevelled gears at the fornt of the torque tube stripped. I hit throttle hold and auto'd in hard but level onto asphalt, looks like minimal damage, skids and those gears. I thought I had too much play in the back and just right up front but the front failed, it did screech a bit before it let go but it was kind of a whine and I wasn't sure if that was normal or not.

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05-21-2011 04:03 AM  7 years agoPost 6
Sky Dancer

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Bryan, Texas

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Sorry to hear about your gears....

I also hear a gear noise but only when the tail is being put under a hard load (like flying fast sideways with the left side into the wind). That's normal and is nothing to worry about.

I'm wondering if in your case, it might have been the sound of your gear lash getting quite tight and that could cause overheating and result in damage to the gears.

Lets hear what you find out and include some photos.

Don C

Keep up your rotor speed !

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05-23-2011 07:43 PM  7 years agoPost 7
husafreak

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Livermore, NorCal

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The photos of tiny black gears are are hard to read but anyway I bent over about 3 to 4 teeth on each fwd bevel gear. To me the mesh was perfect, about 1/2mm of play. The real wake up call came when I tried to buy parts. Unfortunately it looks like Rave 450 parts are going to be a problem I think I got the last landing gear in the USA after an exhaustive internet search. Great flying heli but not one you want to risk crashing... Thanks to Complete--li!

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05-28-2011 08:19 PM  7 years agoPost 8
husafreak

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Livermore, NorCal

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OK I got some good photos today. Only the front tail shaft drive gear lost teeth, the front bevel gear that is turned by the main gear assembly is in good shape except for a couple teeth have a slight tilt. It is pictured from both sides. I redid the mesh using the technique described above but I admit it is pretty tight, there is very little play now, almost none at the straight cut gears, total play at the tail rotor is 5-6mm. Any way I plan to try it because it runs very smooth and quiet.
Do you think I should lower the stop gains in my Vbar? I just did the basic setup using Mikado recommendations. I have no experience with what would be the best settings. Thanks!

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05-28-2011 08:21 PM  7 years agoPost 9
husafreak

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Livermore, NorCal

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Here's the pix.

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05-28-2011 09:37 PM  7 years agoPost 10
MarshallB

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Middle Arkansas

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What do you mean it is pretty tight? You should be able to tilt the heli on its side and rotate the blades with no drag whatsoever. The blades should rotate and come to a stop on their own. It should be very smooth. You shouldn't feel any gear mesh through the boom. Should be minimal backlash though but smooth. This is how I confirm I have the mesh not too tight.


CurtisYoungblood.com
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05-28-2011 10:31 PM  7 years agoPost 11
husafreak

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Livermore, NorCal

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I just mean there is very little play in the gears as I have them adjusted now, just enough to know it's there but no more. The feel is very smooth though, no drag from the gears at all.

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06-12-2011 04:37 PM  7 years agoPost 12
husafreak

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Livermore, NorCal

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Well I have a bunch of flights on the new gears and all seems well. I think the culprit was too much play in the front bevel gears. I also put a tiny bit of molyb--- grease on the gears. The heli does have a little ring or whine to it but it runs well, it is a blast to fly.

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06-13-2011 05:13 AM  7 years agoPost 13
Dr.Don

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Cedar Park, TX -- USA

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A tip on tail gears for the little RAVE:

-- Move your tail rotor to zero pitch when you start the spoolup.

-- Do not have much negative collective pitch on the heli while spooling up. As the main rotor spools up the gyro will apply pitch to the tail rotor to counteract the torque. If you hold the heli "nailed to the ground" with a lot of negative pitch and simultaneously give it a tail correction it can strip the tail gears. I have done this and seen others do it multiple times.

Dr.Don

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06-13-2011 05:41 AM  7 years agoPost 14
husafreak

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Livermore, NorCal

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Good advice, never thought of that but since I've gone flybarless I've started zeroing out the collective and finding a good tail blade pitch and then switching out of throttle hold to let the gov soft start bring the rpm's up before takeoff.

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06-13-2011 11:41 AM  7 years agoPost 15
KennyS

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Marble Falls, Tx

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I also agree with Don for spool up. What I have most recently on a new setup for "Normal" mode is decrease the pitch to somewhere in the 4 to 5 degree range for negative. The model spools up with no load very nicely then.

Kenny

Only Fine Helis, Hobbywing

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06-13-2011 01:03 PM  7 years agoPost 16
MarshallB

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Middle Arkansas

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Another thing to watch for is too high of a gain. If you are flying and the tail starts a fast wag, land it and lower the gain. It will hammer the whole tail system and most likely will strip the gears very quickly. This is true for many models. This can happen if you raise the head speed or when doing a maiden flight. Always start with a lower gain and work your way up till the tail is solid but smooth.


CurtisYoungblood.com
Next-D
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06-27-2011 08:19 AM  7 years agoPost 17
husafreak

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Livermore, NorCal

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Got about 20 flights with the new gears, AOK.

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