Sick of this....

[jamiesawyer28041978]

Basicly ive trashed my trex again , 2 servos , feathering shaft , main shaft flybar, main gear and boom.Im going to get new servos and a new gyro and was thinking of this http://www.fast-lad.co.uk/store/hite...rvo-p-553.html to replace the servos . The gyro was the reason this time cos the tail let go in a flip and funnaly enough the helli landed in a treewhich killed the shafts . Then I had to clamber up the damb thing to retreve it but it fell and bent the boom . I ve got a 401 in the knight and would prefer not to buy another realy and was looking at the spartan but unsure of this and a tail servo. But this needs to be sorted so im open for sugestions guys.

[jamiem]

your blowing the tail out then? i had this problem with my 450 on a 401 with a 9257. i changed to a spartan ds760 which helped a lot, but ive also learnt to control the pitch changes better so as not to bog th ehead and blow the tail out.

if your going to replace the servos, get the mg's for the few ££ more, ive decked mine 5 times now, and never once damaged a servo

[jamiesawyer28041978]

Thanks jamie , think you better touch wood after that coment can you show me a link on fast lad to these servos so as I get it right please.Any other gyros that are good csm wise or other brand

[moyesboy]

started wih 65hb's and repeced the plastic gears with metal as I broke them over a period of 6 months (the back servo went on for 5 months of that...).

The 401 should be excellent if set up right. Only problem with it is the piro rate isn't as constant as a CSM720 or the like - it whips with the wind. My 450 holds well and only ever stepped the tail out in an accidental desperate sticks in corner full pitch miss the ground manoevre I did the other day which actually bogged the medusa 2500 momentarily!

401/9257 shoukldl be as good as mine with the FS61BB.

you could try the hitec badged logictek 2100T package with hitec servo that fast-lad is doing if you don't want another 401.
badged logictek 2100t with 5083 digital servo

hs65mg

[Smoothound]

Here you go HS65MG

[jimheli]

Here you go HS65MG

as Smoothound said i have crashed a few times now & no probs with them

[Tim Procter]

Here you go HS65MG

Or a pound each cheaper at Leeds Model Shop..

Nice servos Jamie, Got them in my 450SE v2 and work great.

[moonmanflyer]

Basicly ive trashed my trex again , 2 servos , feathering shaft , main shaft flybar, main gear and boom.Im going to get new servos and a new gyro and was thinking of this http://www.fast-lad.co.uk/store/hite...rvo-p-553.html to replace the servos . The gyro was the reason this time cos the tail let go in a flip and funnaly enough the helli landed in a treewhich killed the shafts . Then I had to clamber up the damb thing to retreve it but it fell and bent the boom . I ve got a 401 in the knight and would prefer not to buy another realy and was looking at the spartan but unsure of this and a tail servo. But this needs to be sorted so im open for sugestions guys.

I know how you feel Jamie, trashed my 500 sunday eve after bringing it back from charmouth in one piece, even managed to snap my frames in half, waiting on bits now to rebuild but all i have at the moment is a box of bits as i had to completely strip it down, it will be like a new kit build again.
As for gyro, i have the 401 and 9257 servo on my tail and it is fine, not had the tail let go yet, this is on both my 450 and 500, if you fit the bigger servos to the 450 they then seem to be rock solid so i don't fit the micros on the tail anymore due to myself having a similar problem, the tail wouldn't hold properly.

[svein]

Based on my limited up-to-date flying experience, and some basic engineering theory, it sounds like the "blowing out tail"-problems are rpm-related. Short version: Increase headspeed, decrease pitch. If you still blow it out, this means you're adding too much pitch (cyclic, collective, and even tail!), and eighter run out of torque (and momentum!), or add so much pitch that the blade (including the tailblades) stall. It's still the same thing: Less pitch! If you need more lift, increase velocity (rpm), or increase area (blade length). Those of you who fly planks can probably relate to the following phrase: "root stall". They are rare on fixed-wings (tip-stalls are far more common), but they give a lot more interesting results (see: snap-rolls). As with heli rotors, they are caused by too high angle of attack (see: Pitch), compared to the velocity (see: headspeed), the air stops following the airfoil above the wing, and you loose lift. In short, you will be giving spectators a short crash-course (pun intended) in creative use of language, even if you manage to save it before it hits the deck/vegetation/yourself/a spectator.

//Svein

[moonmanflyer]

Based on my limited up-to-date flying experience, and some basic engineering theory, it sounds like the "blowing out tail"-problems are rpm-related. Short version: Increase headspeed, decrease pitch. If you still blow it out, this means you're adding too much pitch (cyclic, collective, and even tail!), and eighter run out of torque (and momentum!), or add so much pitch that the blade (including the tailblades) stall. It's still the same thing: Less pitch! If you need more lift, increase velocity (rpm), or increase area (blade length). Those of you who fly planks can probably relate to the following phrase: "root stall". They are rare on fixed-wings (tip-stalls are far more common), but they give a lot more interesting results (see: snap-rolls). As with heli rotors, they are caused by too high angle of attack (see: Pitch), compared to the velocity (see: headspeed), the air stops following the airfoil above the wing, and you loose lift. In short, you will be giving spectators a short crash-course (pun intended) in creative use of language, even if you manage to save it before it hits the deck/vegetation/yourself/a spectator.

//Svein

Problem is svein in reality that is not nessasarily the case, sometimes servo/gyro combinations can't handle the most agressive flying styles, in the case of the 450, i have found that cheep micro servo's conected to even decent gyros cannot handle the tails properly if you are very aggressive with them, i have now changed both the 450's in our ownership to 9257 servos and the tail issues have gone away completely, for general sports flying they are fine but as soon as you try more a 3D style they struggle with the torque of the tail. All the people i know that fly very hard 3D use the bigger servos as the micros can't cope as they just don't have the torque of the bigger servos.

[svein]

That comes down to servo speed and precision (or lack of. A slow servo will always give you problems, same with an imprecise one, since both will make the gyro spend more time correcting its own corrections, than correcting for airflow)

//Svein

[chugga-bug]

jamiesawyer28041978

Sorry to hear of your crash man

Looks like you and me are in the same boat!


Frame, 3 HS65's, and the usual shafts. Oh and a 4s pack with 6 charges on it.

Haven't got round to checking the gyro & RX yet

[moonmanflyer]

That comes down to servo speed and precision (or lack of. A slow servo will always give you problems, same with an imprecise one, since both will make the gyro spend more time correcting its own corrections, than correcting for airflow)

//Svein

Agree with you to a point, but if was as simple as that you would have a micro servo on a 90 helicopter, the higher the head speed on even a 450 will create a lot more torque on the tail rotor, and though it is all connected to servo speed and precision it also needs the torque to allow for these figures to be acheived, and a bigger servo can be as fast and precise but have the power to move the tail blades more efficiently. I have 2 450, well one is my sons, both were running a cheep gyro and hitec micro, had tail hold probs, changed gyro on mine to a 401, not much better, put on bigger 9257 futaba, perfect, then as an experiment using the cheeper gyro on the other 450, put a 9257 on that, also perfect, a gyro is only as good as the servo it is connected to.

[jamiesawyer28041978]

if you fit the bigger servos to the 450 they then seem to be rock solid so i don't fit the micros on the tail anymore due to myself having a similar problem, the tail wouldn't hold properly.

Bigger servos as in the 9254 like i have on my 50 knight , wouldn't that make it tail heavy though and how would you mount it on the boom.