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Joker › A Very Bad Day for the Joker, Any thoughts?
12-03-2005 03:43 AM  12 years agoPost 41
the19hole

rrApprentice

Lexington, KY

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I've not spooled up since getting her back together with the tail blades. I did spin up with out the blades and she's smooth from o-2000 rpms.

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12-05-2005 02:01 AM  12 years agoPost 42
Squirrlybird

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Suffolk, Va US

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Thanks, I have had some vibration that is normal for most helis but I dont know what is normal for this size electric. It is enough that I can see the vib while hovering. Of course i want to be as smooth as possible, I just wasn't sure if perfection can be achieved.

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12-05-2005 07:42 AM  12 years agoPost 43
JohnC

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East Yorkshire, England

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Squirrlybird,
When I hover close I can see my tail vibrating.
Don't worry - if you practise more, you won't be so nervous .


Sorry. I should be quiet.

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12-05-2005 08:44 PM  12 years agoPost 44
Bell Bloke

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UK

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Hi Squirrlybird, I fly a Wren turbine/Predator, it's a fraction bigger than the Joker, I had a tail vibe on that, which I got rid of. Basically high frequency vibes are very destructive and you need to get rid of them.
What I do is to tape on a 4inch 0.5mm sprung steel 'wobbler' this I use as a visual indicator for 'HF vibes.' Then I use thin strips of thick 'Duck Tape' and I tape them to the blade C of G until the tail runs totally smooth, then I lighten the heavy blade by a comparable amount and remove the tape and 'wobbler.'
Presto!!!
Individual blade balancing doesn't always work, it's better to dynamically balance on the model, same as you would balance a racing engine.
My tail blades were new by the way and they were out. If you think the tail spindle may be bent, try swapping the blades over, if you have to move the tape then it is, if you don't then the blades were out.
I hate to lecture, but if you fly with a tail vibe something WILL let go, it's just a matter of time.
Have fun, Bell Bloke.

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12-08-2005 01:23 AM  12 years agoPost 45
the19hole

rrApprentice

Lexington, KY

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It's back, back together that is. Spooled her up tonight in the basement. I balanced every part/blade and remeasured every link during assembly and she was smoother than the first flight. When I say NO vib I mean NO VIB. The tail before would have a very low amplitude buzzz to the vertical stabilizer. That's no more and was maybe the root of the problem, don't know!

We are expecting snow tomorrow so probably no flight. How about the first flight for some first of the year snow pics?

One question for you guys. I read over in the AP that DJ does not rebuild servos, he replaces them. I rebuilt all three of mine. I've done this for years on cars with no problems. Thoughts?

I have also started the second Maxi. Can't wait to get her done.

Allen

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12-08-2005 01:02 PM  12 years agoPost 46
Bell Bloke

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UK

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Hi the19hole, when I was learning to fly I used to strip servo gears all the time.
As long as it's just the gears you've stripped, then replacing them is absolutely fine. If there is an impact mark on the servo casing or the wires have been pulled, then I would bin the servo. A stripped gear is nothing really, as long as you are confident with your overhauling ability.
As a little safety/money saving point, when ever I have a new heli or have just repaired a heli or even made a significant mechanical change to one. I always do low level hover/flight testing (Below 4 feet) for at least 1 hours flying, this practice has saved me from crashing at least 3 times that I can think of.
Why? Because I've had 2 brand new speed controllers fail on me in the past, I've had a new servo, a new giro and a new BEC pack up on me too.
And guess what? They all failed within the first 45mins of use, this I believe is due to quality control issues when they are made. I do find though that once a component has survived for as least 2 hours it has never subsequently failed.
In short, regard all new components with total suspicion until they have proved themselves. It could save you a fortune!!
Regards, Bell Bloke.
PS. I have 22 big Li-po packs 4 of them are the old 5C type with over 100 cycles on them, none of them have ever failed!! How's That!

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12-09-2005 01:50 AM  12 years agoPost 47
Squirrlybird

rrVeteran

Suffolk, Va US

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I am glad to hear that you are all fixed. I rebalanced my tail as well and resolved my vibe issues to the best of my ability. I just used my vertical stabilizer as a visual indicator and was able to greatly reduce the issues that I had. It is still a slight buzz but it is visually alot better than it was. I did not use sanding as my method, instead I used a small amount of sticky back monokote, or whatever that stuff is, on the lighter blade. I will just have to remember to check it as part of my preflight and postflight inspections.

Thanks,
Shane

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01-09-2006 12:07 PM  11 years agoPost 48
Art-Tistic

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Somerset, NJ

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711 bushings?

Were the aluminium bushes 711 really mounted?
I'm looking at my tail (maxi v.1) and the instructions manual and I don't see these bushings. So, I could push the grips inward several mm's. I wasn't too concerned as I assumed that the centrifigal force would keep them out, however after reading this post I'm very concerned. Joe/Gerd are these bushings suppossed to be on all versions of Joker tails?

The weather is suppossed to reach 55 by the end of the week and I'm hoping to have a "successful" maiden flight ....please help.

Thanks!
Ant

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01-09-2006 01:18 PM  11 years agoPost 49
Notar

rrKey Veteran

Taxachussetts

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No, the new version with the metal grips.
Joe

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01-09-2006 01:43 PM  11 years agoPost 50
Art-Tistic

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Somerset, NJ

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Thanks Joe!
That's a relief.
Regards,
Ant

Anthony J Francese
Owner/Executive Producer
Artistic Expressions Video Productions

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04-02-2006 01:34 PM  11 years agoPost 51
cfranks

rrVeteran

Adelaide South Australia

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I'm sad to say I just lost 1 tail blade /holder on my Joker 2. Less than 1/2 hour total flight time. No chance of autoing and it even trashed the batteries. The cause was the 2.5 mm bolt holding the tail blade holder, the head sheared off. 130 tail blades and a head speed of ~ 1300 with OF 800 mains. Is that 2.5mm bolt large enough to hold or should I have had a high tension version?
I'll send a list of parts to Joe.

Charles

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09-26-2007 04:04 AM  10 years agoPost 52
T-rexn8

rrKey Veteran

CoLoRaDo

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Hello. I am thinking about getting a Maxi Joker and I was wondering if this is still a problem or concern with minicopter owners??

Thanks.

Nathan

Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano

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