Tail Movement

[Aidi]

Howdie Folks,

I have just flown my T-Rex 500 for the first time, and i have to admit i am pretty impressed with it.

One thing i did notice was that the Gyro (GY 401 with 9527) was not acting quite as it should. Where as its not quite a "wag" there is some noticable ocsilation when in the hover. The prominent movement is when in a quick climb. The tail will kick to the right.

I have tried lowering and raising the gain between 74 and 84 and settled at 81 which gives the best results.

I have read a number of posts on the subject, but can't put my finger on the cause of what mine is doing.

Any reccomendations would be appreciated.

Rgds
Aidi

[robgt]

I recommend replacing the plastic hexagonal bolts in the tail boom housing with these aluminium upgrade ones.

I hope that helps
Cheers,
Rob

[chugga-bug]

Could it be headspeed related?
What battery/pinion are you using?

[chugga-bug]

I recommend replacing the plastic hexagonal bolts in the tail boom housing with these aluminium upgrade ones.

I hope that helps
Cheers,
Rob

How will that affect it Rob?

[Aidi]

at the moment i am flying a Maxpoly 5S 4000mAh on the stock 13T pinion. I am waiting on a 15T to arrive.

Would this combination cause the effect i am seeing? And what affect will the tailboom bolts have?

[robgt]

They stiffen up the tail rotor housing and allow (force) you to use proper M3 bolts to fix to the heli rather than poxy screws with glue into plastic

The tail area is IMO too flexible, and a lot of strain is put on this area when flying. If it flexes, the gyro can't do it's job properly.

I don't know if this will resolve your issue, but it should certainly help if you haven't already fitted these - which I'm guessing not if the question was asked
Cheers,
Rob

[chugga-bug]

at the moment i am flying a Maxpoly 5S 4000mAh on the stock 13T pinion. I am waiting on a 15T to arrive.

I reckon that will be giving you a HS of around 2100rpm.
I don't know how low you can go on this heli most seem to be running 2500+.

I'm running a 401/9257 at 2500 ish and my tail is holding fine.

[Aidi]

I have just ordered the Hex bolts along with the 15T pinion. Once they arrrive ill get them fitted. In the mean time ill go over Finless Bobs Gyro setup on the 500 again just to make sure i didnt inadvertantly miss something simple!!

Thanks chaps
Aidi

[chugga-bug]

Just a thought....Have you got the gyro switched to digital servo?

[Aidi]

It is now! It is a hard switch to see. I should have put my glasses on before i checked it. I have now made sure that it is in the ON position. I think it was before, but i cant be 100% Ill try it tomrrow and see if it makes any difference.

Rgds
Aidi

[Aidi]

Just put a battery through the 500, and having insured that the switch was in the digital mode, it still reacts the same. The 15T pinion and tail rods should be here tomrrow, so ill fit them and see what happens.

Rgds
Aidi

[J3DI]

Can't remember if there are spare bolts of correct length in the kit to go with the metal hex spacers you ordered. What you can do is upgrade to the metal bearing blocks then transfer the hex spacers and bolts from the plastic bearing blocks to the tail. There is a marked improvement with metal spacers in the tail.

[robgt]

There is a marked improvement with metal spacers in the tail.

Absolutely!
Bolts don't come with the kit though... I keep plenty M3 bolts in stock for just such occasions though
Cheers,
Rob

[Aidi]

Rightho, I think ill leave the upgrade of the bearing blocks until next month... As for the M3 Bolts... thats a real bummer the fact they dont come with the spacers. Would the likes of Halfords or B&Q stock them? I dont fancy having to order yet more parts and pay another load of P&P... Not that i am a tight@$$... but if i can get them local i can get the upgrade done tomrrow evening.

Rgds
Aidi

[robgt]

Dunno if Halfords etc do them?
I always buy mine from Ian at ModelFixings.
Cheers,
Rob