Stripped gears in flight!

[t-rex pedro]

Put a Spartan on one of my 600's recently and its been great. However, tonight I was practicing 4 point piro's when kind of doing a wall (not sure if that has a name?!) with sharp stops. Heard a wierd clicking noise so brought it down and found I had stripped the front TT gears in flight!

Now, I know I'm not good enough to do this with my flying so my question is what parameter do I need to change on the settings to kinda soften the stops? I have the USB lead so i'll have a fiddle with it later.

As always, any help gratefully recieved.

[raptorheli2]

wow, i don't think your gyro stops done this. i think you maybe had a dodgy gear or something moved.

however if you want to adjust the stops then simply turn the stop gain numbers down about 10 and try again. you can also adjust the decel slider down slightly as this will have a similar effect. basically going between both will get what you need.

cheers

[trvo]

My bet is that you've caught them on the ground in an earlier flight (enough to weaken them) and they've finally gone. I did however go through a recent batch of 6 sets of gears where they stripped every 2 or 3 flights but when I put an old used set back in it was fine, could be either. I highly doubt the gyro stops are breaking them on their own.

You probably shouldn't worry about the gyro settings and take a look at some new gears.

Trev

[Ade_Law]

i know trev went through a period of killing tail gears in a few flights but has since stopped.

maybe a dodgy batch of gears?

Ade

[xygax]

Pete :
You need to plug the PC in to soften the stops... http://s297.photobucket.com/albums/m...t=100_0665.jpg
the deceleration in mode 2 tab is the one you need...

Steve

[t-rex pedro]

Definatly did not hit the tail on the ground. I'm extra careful with the TT gears. It definatly happened during flight as I inspect the heli before every session and this was the first flight this evening. Maybe a dodgy batch then? The stops are very sharp but I swapped the gears at the field and it didn't happen again, saying that I was being more careful to slow the piros down.

[Ade_Law]

i ran the spartan stock on the synergy with no issues but as steve says you can drop the deceleration down to half way then creep up from there until your happy.

Ade

[Aidi]

I was being more careful to slow the piros down.

Where you!! Bloody hell! Cant imagine what you were doing when you stripped them!!

Hopefully it was just a dodgy set, if you want to try a set of mine if it happens again, they are always in my flight box mate.

Rgds
Aidi

[barney]

As pointed out you can soften the gyro via the USB as above. Having run 2 x 600N's myself almost exclusively I do suspect the gear mesh is a contributary factor, or a bad set of gears.

The gears are quite soft and can easily be damaged by tail touching the tails in long grass for example. The get around for that isrunning the tail blades on the loose side.

OK on to the gears themselves.

Both the umbrella gear and flat gear can be easily adjusted to get minimium backlash

Robgt has done an article about replacing the gears and how to adjust the backlash here on the umbrella gear

http://www.50-tuning.com/articles/tr...rive-gears.asp

If the play is on the lower gear (flat one) all it may require is pushing the tail assembly forward when bolting it up, but if you feel its excessive you can elongate the mounting 12 holes in the frames and the locating slot by a small amount. A small round file is perfect for this and it only takes a few mins to do.

Hope thats of Help Brian

Team Spartan Pilot

[machasm]

Both the umbrella gear and flat gear can be easily adjusted to get minimium backlash

Robgt has done an article about replacing the gears and how to adjust the backlash here on the umbrella gear

http://www.50-tuning.com/articles/tr...rive-gears.asp

If the play is on the lower gear (flat one) all it may require is pushing the tail assembly forward when bolting it up, but if you feel its excessive you can elongate the mounting 12 holes in the frames and the locating slot by a small amount. A small round file is perfect for this and it only takes a few mins to do.

Hope thats of Help Brian

Team Spartan Pilot

I never realised you could make this adjustment and always pushed the umbrella gears home.
Might need to check them now!
Oh and SLOW DOWN PETE!
Adrian.

[moyesboy]

Robgt finished with:

Don't forget to clip the rudder pushrod back onto the bell crank!

I was so close the other day...wiggling thwe sticks as you spin up is such a good idea!

I always pulled the torque tube gear out cokplete with bearing and it is very tight in the bearing. It is really hard to get the bearing off and really hard to get it onto the new gear. I was considering getting a spare bearing to have a quick change assembly.
My gyro is on the top of the tail assembly and it is a pain to keep needing new stickies for it - but it won't fit on the front (720, plugs come out the top).

I never stripped the gears in the air, only by hitting the tail. But my gears were bought last spring and I just fitted the last set of the three.

I found these after market ones from www.centrury-rc.com that come in bright blue or red, slightly cheaper - who is going to risk their expensive heli to try them?



I also now want to set the gear mesh which on mine is just how it went together. Maybe ~i can get rid of a lot of the resonance noise my heli makes.

[Andy from Sandy]

wow, i don't think your gyro stops done this.

Why jump in with a defensive answer?

More likely the full power of the tail rotor system has been realised by the Spartan gyro, unfortunately other parts of the helicopter are not up to the job! lol.

[raptorheli2]

i'm sorry? the reason i "jumped in" like this was i don't think the gyro caused it.

it wasn't a defensive answer, it was an honest one. i'm sorry if you take offence with that and trex pedro i'm sorry for trying to help.


cheers

[Ade_Law]

because we have used stock settings on a synergy which isnt exactly known for its tail drive strength...

if the synergy copes with stock settings then the 600 should too.

Ade

[Andy from Sandy]

I think you missed the tone of my post. Maybe had I picked a different word to jump might have shown I was not being serious or taking any offence at anything you wrote. To the contrary it was an oppotunity to inject a little humour, or so I thought.

You have a good product, no doubt about that.