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Rave 3D 450 › Rave 450 - Confidence in the tail gears?
12-05-2011 01:40 AM  5 years agoPost 21
lazor 22

rrApprentice

Wendell, NC

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Well got it flying really good today, flew real smooth. Got my confidence up and on the 4th flight bam my back 2 tail gears strip out. Busted my brand new yellow canopy pretty bad. So I think I will try 1 more time time and if it strips again I guess I'll try to sell the airframe and maybe get a 450 pro or a mini protos.

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12-05-2011 02:10 AM  5 years agoPost 22
Sky Dancer

rrVeteran

Bryan, Texas

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Man, sorry to hear about your accident....

Two things I would consider:

1: Flying with a bad tail wag could weaken gears and could ultimately result a gear failure (especially when running high head speeds).

2: When changing TR gears after a crash, I always change "all" bevel TR gears because they may look good but can be weakened in a crash only to wind up giving up later on.

Don C

Keep up your rotor speed !

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12-05-2011 02:27 AM  5 years agoPost 23
lazor 22

rrApprentice

Wendell, NC

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I didn't have a bad tail wag today after adjusting gain. Also I can't get the back tail assembly off the boom to change the gears. I see the whole assembly for sell but only need the silver piece holding it onto the boom. Do they sell that by itself (hope so cause I don't have the money to get the whole assembly) and what's the part number?

BTW I was running 3100 headspeed.

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12-05-2011 02:32 AM  5 years agoPost 24
MarshallB

rrVeteran

Middle Arkansas

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Sorry to hear about that.

If you can't get the tail case off you have not removed the anchor screw that catches the boom notch.

I've never stripped the tail gears. Only the front gears. The mesh must have changed. Either by the tail case clamp screw or the anchor screw didn't hold. Also make sure you have the spacer washer on the tail shaft inside the case to control the rear gear mesh by keeping the tail shaft positioned to one side.


CurtisYoungblood.com
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Spyder Batteries

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12-05-2011 04:09 AM  5 years agoPost 25
lazor 22

rrApprentice

Wendell, NC

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I have all the screws removed the tail case wont move. It has the spacer on it.

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12-05-2011 03:28 PM  5 years agoPost 26
Sky Dancer

rrVeteran

Bryan, Texas

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Yep, sounds like the previous owner had super glued the tail case to the tailboom and you didn't have the ability to properly set the gear lash. Without the ability to properly adjust those gears, they may have been set too loose (or too tight) and the previous hunting you described could have damaged the gears (even though they may have looked fine) and in a later flight they failed. I've seen this happen.

The tail gears perform very well and I haven't had any problems, even when practicing autos. I simply make sure not to drag the tail in on autos and I avoid landing in tall grass.

Like Marshal, I too have never stripped any rear tail gears except in a crash.

Don C

Keep up your rotor speed !

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12-05-2011 06:08 PM  5 years agoPost 27
littleman

rrKey Veteran

Pasadena, Ca

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lazor:
pm sent
A.J.

Proud member of Teams Castle, MSH USA, Futaba, Scorpion, & Nick Maxwell Products

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12-06-2011 04:40 AM  5 years agoPost 28
husafreak

rrKey Veteran

Livermore, NorCal

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Yo lazor, give that heli another chance, you have a lot of time and money invested already right? I striped my front tail drive gears on my fourth flight and freaked because I had read the horror stories and thought maybe I made a mistake with this heli. I repaired it and somehow got the mesh right because now I have at least a hundred flights and it flies fantastic. I banged out four flights this morning and decided to reply to this thread to give it another chance before you throw in the towel, it is such a great heli when it's working right!

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12-07-2011 07:34 AM  5 years agoPost 29
lazor 22

rrApprentice

Wendell, NC

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I am going to give it another shot, hopefully it will be good. The front gears look to be fine but you think I should replace them?

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12-07-2011 02:55 PM  5 years agoPost 30
Ejeremy

rrKey Veteran

Bourbonnais,IL

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If it was me I would. You never know if the gears have been stressed in the crash and $10 is cheaper then another crash.

Jeremy

Team Futaba
Team Thunder Tiger
Team Radix
VP Powermaster Fuels

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12-07-2011 03:05 PM  5 years agoPost 31
husafreak

rrKey Veteran

Livermore, NorCal

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Good luck this time brother, I really hope you get it right, I checked again and have almost no play, but not tight, and I use plastic gear grease, follow Skydancer's setup tips.

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12-07-2011 03:14 PM  5 years agoPost 32
Sky Dancer

rrVeteran

Bryan, Texas

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The front gears look to be fine but you think I should replace them?
Yep.... Great insurance!

You really can't see stress on plastic gears until they fail.

Don C

Keep up your rotor speed !

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12-07-2011 11:10 PM  5 years agoPost 33
Jgatorman

rrVeteran

Birmingham, AL

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Skydancer don't you have a post on setting gear mesh on the rave if so and he has not seen it provide him a link. Also always check for dust coming off of the gears and on the gears this is always a good way to tell (if you are not greasing the gears) dust build up is bad and means that your mesh is incorrect.

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12-08-2011 12:16 AM  5 years agoPost 34
Wingman77

rrProfessor

Pulaski Tennessee

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all of the times I have had these gears fail I have noticed geardust built up several flights before due to improper mesh. keep an eye out for that and if you don't have any gear dust it is unlikely that they will fail.

Edit: LOL I did not see your post before I posted Jeff

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12-08-2011 12:54 AM  5 years agoPost 35
Jgatorman

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Birmingham, AL

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That is quite OK. I learned It from you.

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12-08-2011 02:00 AM  5 years agoPost 36
Sky Dancer

rrVeteran

Bryan, Texas

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This is the way 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

Keep up your rotor speed !

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12-18-2011 03:46 AM  5 years agoPost 37
lazor 22

rrApprentice

Wendell, NC

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Well I flew it 8 flights today no gear problem. Setting up my beastx still. Here is a video I got but it still was feeling pretty bad so I was taking it easy.

Watch at YouTube

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12-18-2011 06:32 AM  5 years agoPost 38
Scotty

rrNovice

Calgary, Canada

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Tail gears???

I crashed my rave 450 at least 3 times due to tail gear failure.
I have one of the original kits... long before the upgrades.
The tail gears would strip in flight and with 325 blades...It was all bad...
Now to today... All the stock upgrades. Black tail gears,carefully setting gear mesh,350 blades, Mini Vbar,3s, cc50 lite, and 285mgs...
this thing is just wrong.. Unbelievable...Only been flying helis for 20 years..
this thing just rocks...
Don't mess around.. Vbar,350 blades and the Rave fbl..
this is the stuff... it just works!
Regards
Scott

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12-18-2011 06:37 AM  5 years agoPost 39
husafreak

rrKey Veteran

Livermore, NorCal

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nice video, nice flying, glad it worked out!

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02-02-2012 04:11 AM  5 years agoPost 40
THX1138

rrElite Veteran

Camp Bondsteel, Kosovo

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So reading this thread has motivated me to get mine back in the air. Just finished the Mini-V set-up this evening...

Gonna try her out tomorrow if the weather holds...

Lou

Just give me five dudes and two flashbangs...

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