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CARF Joker build thread

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Old 07-04-2019, 03:29 PM
  #676  
kevin
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I was told the production run of the pnp servos changed at some point at the factory and should be run at no more than 6v. I swapped all of my pnp servos out for mks.

Go back and start at post 440. I think there were some issues noted before that as well.

Last edited by kevin; 07-04-2019 at 03:35 PM.
Old 07-04-2019, 03:34 PM
  #677  
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Originally Posted by kevin
I was told the production run of the pnp servos changed at some point at the factory and should be run at no more than 6v. I swapped all of my pnp servos out for mks.
MKS - never go wrong! I’m using MKS 747
Old 07-04-2019, 09:15 PM
  #678  
Dave Wilshere
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That’s correct, the original MacGregor servos although labelled HV were strict 6v only. The instruction sheet says 5.9v Sensor switch, which is what I use and my customers, at the regulated 5.9v the servos work faultlessly. The servo has been replaced by a true HV servo now, but there are a lot of PNP kits made with the original servos.

i guess in your case the Flap servo works the hardest and it’s overheated

Dave
Old 07-04-2019, 09:19 PM
  #679  
Dave Wilshere
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Originally Posted by kekelala


MKS - never go wrong! I’m using MKS 747
Unfortunately any can, a friend crashed his SU-27 because one MKS rudder servo went hard over and stayed there. It’s a dead servo.
Old 07-05-2019, 01:37 AM
  #680  
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Originally Posted by Dave Wilshere

Unfortunately any can, a friend crashed his SU-27 because one MKS rudder servo went hard over and stayed there. It’s a dead servo.
Awww that is true.
Old 07-05-2019, 04:01 AM
  #681  
Dansy
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Originally Posted by Dave Wilshere

Unfortunately any can, a friend crashed his SU-27 because one MKS rudder servo went hard over and stayed there. It’s a dead servo.
True....but a lot less chance with a MKS then a PNP mystery servo set......
Old 07-05-2019, 05:25 AM
  #682  
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I replaced the servos with Hitec I had to rework the mount ( wide) but I want to fly today!
I never use 7.2 receiver pack only Life 6.6.
Old 07-05-2019, 08:15 AM
  #683  
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Ok I order a Voltage regulator ...thanks Dan
Until then not risking the Joker!!
Old 07-05-2019, 01:00 PM
  #684  
Dave Wilshere
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Originally Posted by Dansy


True....but a lot less chance with a MKS then a PNP mystery servo set......
We have over 100 flights on the PNP servos without an issue, but at 5.9v. CARF were not very happy the HV servos turned out to be not HV! You can only do so much testing and putting MKS type/price servos in a PNP kit does not work.
We started testing the new MAC 2810HV servo a few months ago, but there is a lot of caution now before committing

Old 07-06-2019, 03:53 AM
  #685  
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Originally Posted by jcterrettaz
Ok I order a Voltage regulator ...thanks Dan
Until then not risking the Joker!!
JC, Your most welcome, anytime I can help.

Last edited by Dansy; 07-06-2019 at 04:10 AM.
Old 07-09-2019, 12:34 PM
  #686  
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Default Elevator cable protection

Hello,

i’m finalizing my Joker, and was wondering how to guard the elevator connectors at the stabilizer location, in such a way that they cannot touch the thrust tube. Just doet wanna toast the wiring there....



Rgds,
Eric
Old 07-09-2019, 03:12 PM
  #687  
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Originally Posted by Speedrick
Hello,

i’m finalizing my Joker, and was wondering how to guard the elevator connectors at the stabilizer location, in such a way that they cannot touch the thrust tube. Just doet wanna toast the wiring there....



Rgds,
Eric
after installing the horizontal stab to the tail, I pull the servo wires from the stab’s servo tray openings and zip tie the wires. In this way the wires will not be touching the thrust pipe.

Kekelala
Old 07-09-2019, 09:32 PM
  #688  
Dave Wilshere
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Put a loop of Velcro strapping around the lead, have a length of hook Velcro on the fuselage side, just above the tail seat either side. Plug the lead in and attach the loop to the fuselage side.
Old 07-21-2019, 12:39 PM
  #689  
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Default Joker’s CG

Hello,

Today, i spoke some happy JOKER pilots. They told me about the CARF CG that is way to far fwd.
Since this was also mentioned in this thread some months ago, is there any update on the best location?




Kind Regards,

Eric
Old 07-21-2019, 12:39 PM
  #690  
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Default Joker’s CG

Hello,

Today, i spoke some happy JOKER pilots. They told me about the CARF CG that is way to far fwd.
Since this was also mentioned in this thread some months ago, is there any update on the best location?




Kind Regards,

Eric
Old 07-21-2019, 12:51 PM
  #691  
Dave Wilshere
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Depends when you balance it. With no fuel in the main tank it would be way noseheavy at factory setting. Add 30mm fuel to the main tank and put it at 185mm
Old 07-21-2019, 01:03 PM
  #692  
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Ok, thanks for this Dave.
I have a 100ml hopper, located between the fwd part of the wing and the nose wheel well
Presume this one is to be full when balancing?
Old 07-21-2019, 09:03 PM
  #693  
Dave Wilshere
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Always! You don’t want to be landing with no fuel in that...
Old 07-29-2019, 03:04 PM
  #694  
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Hello guys,

Just got the Joker and before buying the turbine, is the Jets Munt new VT80BL relight more than enough? I do not want to break the sound barrier (yet) but want good performance without increasing the weight too much.

Regards
Old 07-29-2019, 09:02 PM
  #695  
Dave Wilshere
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We fly with anything from a JetCat P-60.

Dave
Old 07-30-2019, 03:08 PM
  #696  
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Originally Posted by apereira
Hello guys,

Just got the Joker and before buying the turbine, is the Jets Munt new VT80BL relight more than enough? I do not want to break the sound barrier (yet) but want good performance without increasing the weight too much.

Regards
I currently fly a Joker with the VT80BL and I can tell you the Joker flies great. No you wont break the sound barrier but it will get you your blood flowing. I have seen speeds in the 170s (mph) level flight. I am sure you could get into the 180's if you dove into it but I am not a speed demon either especially since I am new to turbines and just obtained my waiver so I still fly conservatively. The VT80BL has been flawless on Diesel with 5% Kingtech oil. I fly in Houston where it is hot and muggy and the engine has not missed a beat thus far. The Joker has been a great first turbine airframe and the Jets Munt engine has complimented the airframe well. A match made in Heaven.
Old 09-01-2019, 11:50 PM
  #697  
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Old 09-09-2019, 11:30 PM
  #698  
Dave Wilshere
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Bit of a Joker day with three out at a Jettogether.




Old 09-11-2019, 11:27 AM
  #699  
Tom ling
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Is the Red and black scheme from carf or custom? It looks really smart.
Old 09-11-2019, 12:03 PM
  #700  
Dave Wilshere
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Mmm it’s Orange! But yes, it’s an Infinity scheme, but the owner had me remove the silver trim from the wing and tail.


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