Tail Blow Out- Killing Enjoyment !

[Ubi22]

Ok ladies & gents.... some will know that i have this tail blow out problem with my 450v2, mainly in fast backward flight and also doing funnels, the tail just blows out. Now this is my fun, try it first bird, don't care if it goes so much coz its not so expensive BUT it's becoming a big problem now i can fly better / harder and it killing my fun for flying and costing lots of money.

Setup is as follows :-

BeastX v2 tx mode 125 atv,10% expo
DS520 -ball 9mm out
Tail Blades 61mm
Gain has been tweaked both ways with no joy
setup in rate mode 1st

So i am thinking :-

1, Can any one shine some light on problem ????

2, Change model i.e. swap electrics to another 450 class Heli

3, Chuck the whole heli flying in as it costs to much !

[sacko]

You got another tail servo you can try? A 9257 perhaps...

[Ubi22]

9257 has similar torque to DS520 ! I do have a full size one, but surly that's over kill !!

This one HobbyKing Online R/C Hobby Store : BMS-661DMG+HS Super Fast Digital Servo (MG) 6.4kg / .08sec / 46.5g

[moyesboy]

chinezse weight mod, k&BDD tail blades, ber sure you have the absolute maximum tail pitch throw.
...outrage longer tail boom and belt.
Separate CSM720.
Revert to v1 tail gearing for more tail revs if you can find the parts.

The tail on a 450v2 is not the best and can blow out.

[Ubi22]

chinezse weight mod, k&BDD tail blades, ber sure you have the absolute maximum tail pitch throw.
...outrage longer tail boom and belt.
Separate CSM720.
Revert to v1 tail gearing for more tail revs if you can find the parts.

The tail on a 450v2 is not the best and can blow out.

WOW that seems a awful lot of work to do ! maybe just transplant of electrics into a better designed kit would be better option ? TT360 or Rave maybe

[acwman]

Running too much pitch and cyclic pitch can cause the tail to blow out in situations like this. cannot see any reason why a Beast will not hold in these manoeuvres. Also make sure your lipos are up to the job.

[Ubi22]

Ok will check pitch , if i remember right is set to 9 degrees and i have 40c batts not that old so don't think there the problem !

[trillian]

What headspeed is it running at approximately? I had issues with the tail on my 450SEV2 in a flybarred setup and most
of it seemed to be all about keeping the headspeed, and thus the tailrotor, at a high enough speed. Another thing
that helped is a super fast servo (MKS DS95) and KBDD blades.

Also, the 'sweet spot' for where the link is mounted on the servo arm seems to be 7mm.

[Ubi22]

What headspeed is it running at approximately? I had issues with the tail on my 450SEV2 in a flybarred setup and most
of it seemed to be all about keeping the headspeed, and thus the tailrotor, at a high enough speed. Another thing
that helped is a super fast servo (MKS DS95) and KBDD blades.

Also, the 'sweet spot' for where the link is mounted on the servo arm seems to be 7mm.

Cheers trillan

Hover RPM at beginning of flight: 3625
Hover RPM at middle of flight: 3339
Hover RPM at end of flight: 3223

These are my calculated speed for my setup i have KBDD 61mm tail blades already so i can give the closer ball a try !

[trillian]

Cheers trillan

Hover RPM at beginning of flight: 3625
Hover RPM at middle of flight: 3339
Hover RPM at end of flight: 3223

These are my calculated speed for my setup i have KBDD 61mm tail blades already so i can give the closer ball a try !

Yeah with those headspeeds the tailrotor will be capable of blowing plenty of air so the issue will be elsewhere.

[Eckchaz]

Paul.. It looks like its still affecting us.. I thought I had this issue sorted on the 500 but its back but I have not had the time to fly to sort it out Does yours fly fine all other time (including fast straight line backwards) but then during fast backwards turns it starts sounding like its wagging and then blows out with a roll?

Is there or have you tried longer tail blades? Also with the tail gains.. was it balanced between the head lock menu's and the gain settings?... i.e not head lock low and gain up 80% and what have you got it on now? I read over on HF (Vbar though) the gain is not high enough which causes the blow outs.. so maybe our headlock and gain is not in a balanced and high enough setting?..

[Ubi22]

Eddie the trouble is ive tried so many different combos its hard to remember what helped what, she flys fine apart from backward inverted straight or turns and funnels, there is no sign of wag just a quick as u like 180 piro or 90 with funnels, also when i try to go from inverted forward to inverted backward the tail will get half way and stop no matter how much rudder is applied . I am running KDBB 61mm blades and my current gain setting is 32 (DX8) , i have found like you say too high a gain makes blow out worse and too low cause blow out in any backward flight inverted or not but can't find any gain setting to eliminate all. Interestingly there is another chap at my field who has a 500 which does a very similar thing but it has alway done it ... i.e. with flybar GP780 csm 720 and fbl 3G Beastx..... could we be barking up the wrong tree ??

[Eckchaz]

Sorry Paul.. I did mean all whilst inverted.. mines fine in straight backwards inverted but once I start turning it happens

I'm going to check my pitch ranges as per Andy's suggestion.. I know I'm 12+/- but Pitch but cyclics must be around 13/14.. but what I dont get is, when its doing a level fast-ish backwards inverted circuit.. it still blows out when i'm nowhere near max cyclic/blade pitch? Anyways.. Like i posted before.. I aint had the time to sort this out and not been flying at all this year and just need to find the time to sort it

Have you tried the Beastx forum Paul.. see if Stefan (i think) has an answer for you

[p4ddy]

With a FB SEV2 KBDD tails, scorpion -8 v2, 9257 servo, any premium gyro (including a 401) the tail will hold good in backwards hurricanes, pie dishes etc & should not blow out. It maybe a bit whipy in piro moves with a 401 though but it wont blow out. Also having good lipo's is a big factor BUT only when doing very pitchy moves but foward, backwards etc the lipo shouldn';t affect it, the same way the pitch will only affect it in combination with poor power but only in high pitch manouvres like tic tocs or pitch pumps. It sounds like your end points are incorrect so it's not able to give enough tail pitch to counter act the torque

[Ubi22]

Have posted on BeastX Forum time to wait and see .... cheers p4ddy seems to point the finger @ the beastx as i am sure batteries are fine, 40C and don't seem to have lost any think since new !