RJX 90 MOD ON TAIL

[The Professor]

HI chaps I have been informed that the RJX 90 tail slippage has not been a problem, but as you are aware!  Mr Mallet and myself found this not to be the case so I have taken a closer look at this problem and found that The side frames are pre-drilled to accommadate a 3rd tail boom clamp for the tail transmission end this probably gives you 50% more grip on the boom which I am sure will cure the boom from rotating in flight so all is needed is a clamp and two through bolts and nuts this is mod 1 .The alternative mod is two remove the rear clamp you will see two pre-drilled holes which house the through bolts and two holes in the boss which one is already drilled, drill the other carefully with a 2.5mm drill bit . Then using some plasticard drill & fit this to the frame secure with the kit bolts then using a 3mm drill bit, drill the new holes into the frames then remove and refit your tail boom into your helicopter adjust the tail and make sure everything is inline then carefully drill through the new bolt hole using a 2.5mm drill! and only drill to a depth of 8mm the tail drive shaft is only 12mm away so you must not go to deep or you will strike it   Then slacken the bolts and pull the boom out and re-drill it with a 3mm drill bit then re-fit the boom carefully aline the new bolt hole with the tail boom clamp and secure a 3mm*10mm bolt into the new clamp bolt hole this now locks your tail boom to the tail clamping device check its locked then secure your tail boom clamps bolts tight! job done mod 2. The RJX90 tail belt version is better done mod 1 way. My fly-bar-less wiring was in the way for me to do the, mod 1 way.Please let me make it clear this is an unofficial modifacation and is no way connected at present with KING COBRA or Rossendale models but I am sure they will be happy with mod 1 for tail belt or drive shaft system. below are the simple modifacations in picture form happy flying   F.S.

[TinTin]

That's great Steve. Very good of you to share your superb modifications. Let's hope that solves the problem, but Inferno informs me that Qal had the same problem with the boom slipping in the housing on his X90.

Not had to do any mods on my 700's by the way!!!!!

[The Mole]

That's great Steve. Very good of you to share your superb modifications. Let's hope that solves the problem, but Inferno informs me that Qal had the same problem with the boom slipping in the housing on his X90.

Not had to do any mods on my 700's by the way!!!!!

I guess all them KDE bits are just to add mass then?     

[TinTin]

That's great Steve. Very good of you to share your superb modifications. Let's hope that solves the problem, but Inferno informs me that Qal had the same problem with the boom slipping in the housing on his X90.

Not had to do any mods on my 700's by the way!!!!!

I guess all them KDE bits are just to add mass then?     

No. There's a big difference between bling and modifications!!!

[The Mole]

I sit corrected   

[The Professor]

Mr mole you bad boy be careful he will set snowy on you but you made me laugh

[Inferno]

Qal did have his boom rotate 90degs and unfortunatley could'nt save it "shame".
The thing is!
Over the years I've had a couple of booms ejected "and thats what usually happens when the clamps are slack",the boom gets chucked out the back, its not normal just to rotate 90.
Qal's boom clamp was still so tight we couldnt rotate it back.
Steve were you boom clamps still tight ?, I could be wrong but i think the problem could be in the torque drive.

[TrexMAD]

Seem to remember Ben having a tail gbox eject problem on his 700

[Inferno]

Thats what i said, If things arn't tight it gets chucked out the back.
 

[The Professor]

Hi Tin Tin yep I am confident the modification will cure the tail problem I should have called it the new blinging tail lock system but its a simple fix .
Hi inferno on my 2nd flight the tail had rotated off centre   so I reset the tail and nailed the clamps up even tighter and was a little concerned they might be overtight, its really a torque issue as you say In this case the boom position longitudinally had not changed the metal clamp and boom supports probably assisted in holding it there, but now its locked this shouldnt be a problem anymore and its a relitively quick fix and it certainly fly's beautifully   Its nice to see different models flying at clubs it gives manufactures the ability to compete in the race to build the best with some innovative and stylistic models, Align dominate the market which I find boring and is not good for us I would like to see an Avro helicopter fly at our club just because its a great design and its british.I am sure I will be building another 50 size helicopter and fitting a 90 motor in it with 660mm blades fly-bar-less thats my perfect model it will auto well because of the wing loading and quick as hell!! no bogging just pure power ive done it before, but the 660mm blades will make all the difference.

[The Shadow]

Tin Tin, the dictionary definition for modify is ' to change or alter'.

Therefore by definition all the lipstick you put on your pig, sorry bling you put on your 700 is in actual fact a modification.

[The Professor]

This is most interesting I stripped the tail assembly down and on doing so I found the tail torque tube drive was not running true so I have replaced it.Then I decided to fit a 3rd clamping device to ensure thats about all I can do, although mod 2 has proved most satisfactory. The fly-bar-less system did at about 1600rpm have a bad vibration at 1750 rpm it went away I tried to dial this out with the CSM settings but without any improvement thats why I decided to strip the tail assembly down In the first place  this is possibly the torque tube drive creating the vibe lower down but only around the 1600rpm speed it was annoying me so hopefully it has gone away who knows!! a test flight will soon see if ive been successful its also interesting to know that the RJX90 has two support bearings on the torque tube.

[The Professor]

Fantastic thank-you mr mole you have done a most satisfactory job top-man  

[Country and Western]

That is so funny mole a good likeness to Steve the professor fantastic..............................................hehehe

[Country and Western]

Hi Tin Tin yep I am confident the modification will cure the tail problem I should have called it the new blinging tail lock system but its a simple fix .
Hi inferno on my 2nd flight the tail had rotated off centre  so I reset the tail and nailed the clamps up even tighter and was a little concerned they might be overtight, its really a torque issue as you say In this case the boom position longitudinally had not changed the metal clamp and boom supports probably assisted in holding it there, but now its locked this shouldnt be a problem anymore and its a relitively quick fix and it certainly fly's beautifully  Its nice to see different models flying at clubs it gives manufactures the ability to compete in the race to build the best with some innovative and stylistic models, Align dominate the market which I find boring and is not good for us I would like to see an Avro helicopter fly at our club just because its a great design and its british.I am sure I will be building another 50 size helicopter and fitting a 90 motor in it with 660mm blades fly-bar-less thats my perfect model it will auto well because of the wing loading and quick as hell!! no bogging just pure power ive done it before, but the 660mm blades will make all the difference.

Steve what will you do when it gabs again and swings your heli into an uncontrollable sideways roll