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T-REX 700 › 3 blade tail on my 700x not happy !!
09-01-2018 05:49 PM  23 days agoPost 1
lightningrc

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UK

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Well I fitted the three blade tail on my 700X with the 105mm blades and I new I may have problems even though Align say it’s suitable .
Instantly on take off had the problem with an over powered tail where it fights to find the Center .
Went in on servo arm one hole and was going right direction as not as bad but still not good .
Went in another hole then could not quite reach max end points setting up in my Gpro .
Was better again but still there .
I’m running the slowest tail gear set up 23t front umbrella gear.
My butty has the 760 which has three blade tail and 23t front tail gear and is fine .
Conclusion because it’s running the 760 main blades it off sets the tails power .
Align once again are using us to experiment at our cost !!!!
Only thing I can think to reduce tail power and keep 3 blade tail is to fit the 90mm tail blades for the 550 .
Any one else using this 3 blade tail on a 700 which align recommends !!!?

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09-01-2018 07:17 PM  23 days agoPost 2
chopper37

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NJ and Long Island

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I had it on mine 700L. Had to lower the gain then it was ok, did not change the link holes

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09-01-2018 08:06 PM  23 days agoPost 3
lightningrc

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UK

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First thing I tried , I wound it right down and it made no difference .

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09-01-2018 08:17 PM  23 days agoPost 4
knightofcarnage

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chicago

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I have no issue using a 3 bladed tail. But I was using a vbar neo and now a cgy 760R. I think the issue might be gpro, have you tested it with another type of gyro? Also my buddy has with a speed canopy and running stock gear ratio with out issues (cgy 750) with 105 blades and stock main blades 700. Also It could be your tail servo can't handle the load. What tail servo are you using?

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09-01-2018 08:43 PM  23 days agoPost 5
chopper37

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NJ and Long Island

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That’s a good point with the servo, my 700 all stock except gyro was BD 3X

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09-01-2018 08:59 PM  23 days agoPost 6
lightningrc

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UK

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Using the latest HV align tail servo that came with it .
It’s not a load issue I’ve had the same problems on my trex470 when moving to bigger tail blades and my new goblin 570 sport both were fixed moving in on servo horns .

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09-01-2018 09:35 PM  23 days agoPost 7
chopper37

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NJ and Long Island

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Just to make sure grips are on correct side ?leading vs trailing

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09-02-2018 08:35 AM  23 days agoPost 8
lightningrc

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UK

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Lol yes been flying and building Heli’s over 20 years .
It def now to much power acting against the 690 main blades
Standard tail x 2 105mm blades=210
New 3 blade X3M 105mm Blades= 315mm
So extra 105mm of tail power .
My thinking is to try the smaller 90mm blades x 3 which will give me 270mm .
Then set the servo horn in as close to Center as possible but still reach end points .
Waiting to here off the shop as I’m not wasting money once again with Align using us as test pilots .
I’m already using the 23t front tail box gear which is the slowest tail speed gear they make .

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09-02-2018 01:39 PM  23 days agoPost 9
chopper37

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NJ and Long Island

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well at this point its worth a try keep us posted

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09-02-2018 01:46 PM  23 days agoPost 10
lightningrc

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UK

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Yes will do
Been advised by my shop it’s the Gpro and to use Beast X or VBar with which yes they may be some thing in the tail software to stop this but obviously in my eyes it’s shows tail has to much power now to main blades .
Which it was designed for a three blade head .
So it don’t take a brain surgeon to work out if you have one the same length missing then the tail is going to be overpowered .
And it’s sold with the 760 has the blades are not only longer but wider also .
My 700x was perfect and I thought let’s try this new tail !!! As recommended for my Heli in there advert .

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09-02-2018 02:28 PM  23 days agoPost 11
chopper37

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NJ and Long Island

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yes they do go together, also had 3 blade head on my 700 using BD 3X

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09-05-2018 05:38 PM  19 days agoPost 12
lightningrc

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UK

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Update !
Fitted the 90mm three tail blades .
Straight away was 75% better but just a tiny bit back and for in Center showing still slightly Over powered .
So I went into Gpro settings and took the I gain down from std 60 to 45 and it went away but then was not locked in Center .
I then turned up the cyclic to tail setting and wacked my main gain up .
I also increased the speed of both stops .
I fully tested it doing fast backwards flight and huge backwards loops and what ever you do to it , tail does not move .
If any one else has my issue then I can recommend what I have done .
But in all honesty I think the three blade tail using 700 tail blades is only really suited for the three blade head or the 760/800 size main blades to off set the torque .
Any way at a cost to my self once again and more profit for Align !!

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09-05-2018 05:48 PM  19 days agoPost 13
chopper37

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NJ and Long Island

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Thanks for letting us know, glad you got it working

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09-07-2018 11:29 AM  18 days agoPost 14
Richardmid1

rrProfessor

Leeds, England

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Your issue had nothing to do with 'too much tail power' or the main blade length. It was simply a gain issue.

So now you have much lower gain, shorter tail blades and a slower tail gear ratio so my question is, what was wrong with the standard two blade tail with longer blades, higher gain and a faster tail??

60% of the time, it works every time!

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09-07-2018 11:32 AM  18 days agoPost 15
Richardmid1

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Leeds, England

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edit

60% of the time, it works every time!

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09-07-2018 01:12 PM  18 days agoPost 16
ICUR1-2

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Ottawa, Ontario

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What FBL unit ?
The gains are adjustable on most.

I would like to blame the kit manufacturer too. All to often it is the end user that's at fault.

Why put a 3 blade tail on a non scale 2 blade frame ?

I have been in the the hobby 12 years and I haven't seen everything when it comes to trouble shooting and I'm sure there's still more to come.

Just because you have been around 20+ years doesn't make a difference. You may have seen more but not all.

spending time, paying attention

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09-07-2018 01:43 PM  18 days agoPost 17
Richardmid1

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Leeds, England

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GPro.

60% of the time, it works every time!

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09-07-2018 02:29 PM  18 days agoPost 18
lightningrc

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UK

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Of course it was too much tail power ??
The three blade tail was designed to counteract a 3 blade head or longer main blades .
Yes I don’t Deney a better fbl system I could have adjusted it and prob taken it out but this is masking the problem .
Reason I changed is because my two blade tail grips was the old design and no one had in stock the newer two blade tail grips in the U.K. so means Align recommended it I thought wtf let’s splash out .
The reply of the bell end saying it’s user error is just a stupid response I would expect from a kid .
I run gpros on all my Heli and obviously it’s shown it weakness here , when they last updated the firmware for the Gpro there was not a three blade Heli out .
My point is it should have been plug and play as recommended by Align .
Normally when you can’t get rid of the tail fighting for Center you can just come in on servo horn which I did which made it much better but was not quite reaching the end points so wernt happy .
Tail is spot on now .
But if I could go back in time I would have waited until the new type tail grips came in stock .

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09-07-2018 02:33 PM  18 days agoPost 19
lightningrc

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UK

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Also to the boy asking stupid question like why would I put a 3 blade tail on a older 700x two blade !!
Is because Align Recomends them !!
Like you said if you not know definitely don’t knock other people who do .

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09-07-2018 03:00 PM  17 days agoPost 20
Richardmid1

rrProfessor

Leeds, England

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lightningrc
Also to the boy asking stupid question like why would I put a 3 blade tail on a older 700x two blade !!
Is because Align Recomends them !!
Where have you read that?! Of course they are going to recommend that you buy more of their products! haha.

What I meant was, after lowering the gain, using shorter tail blades and a slower tail ratio, you have probably ended up with a tail with no more authority than the standard two blade tail setup!

60% of the time, it works every time!

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T-REX 700 › 3 blade tail on my 700x not happy !!
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