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CARF Joker build thread

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CARF Joker build thread

Old 01-30-2021, 04:39 AM
  #901  
Bob_B
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Originally Posted by kevin View Post
I balanced mine at about 180 with about 20% of fuel in the tank. After a few flights like that I even moved my 2100 ecu battery from inside the nosecone to the tray under the canopy. That is how I fly it to this day. In my link you can see mine landing pretty slowly even with a k100. I was surprised at how slow it could fly during my initial testing but it is no Havoc or Tomahawk Sabre

https://www.youtube.com/watch?v=40ZpSGwSxa0
Nice landing!
Old 01-31-2021, 02:44 PM
  #902  
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Well my Joker was test flown. The balance was spot on, the elevator did not feel too sensitive. However, my elevator compensation for flaps down was not enough. We had to add loads of down trim to get it set correctly. Ended up with 10mm down with full flaps and 4mm down with takeoff flaps.
Unfortunately, I had a really bad landing and damage the model. I'm too pissed off to fix it. I may pull it apart and use the parts for another model. I put it in the attic while I think about this.
Old 01-31-2021, 02:55 PM
  #903  
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Your elevator figure measured at the root or tip of the elevator?
Old 01-31-2021, 03:32 PM
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At the root, near the fuselage.
Old 01-31-2021, 03:58 PM
  #905  
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Sorry to hear that. Did you have flight modes set in your transmitter?



Originally Posted by jvaliensi View Post
Well my Joker was test flown. The balance was spot on, the elevator did not feel too sensitive. However, my elevator compensation for flaps down was not enough. We had to add loads of down trim to get it set correctly. Ended up with 10mm down with full flaps and 4mm down with takeoff flaps.
Unfortunately, I had a really bad landing and damage the model. I'm too pissed off to fix it. I may pull it apart and use the parts for another model. I put it in the attic while I think about this.
Old 01-31-2021, 04:31 PM
  #906  
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Hi,
I sure did have flight modes set up. I had expert help.
I came in too hot and should have done a run around for another pass. Just a case of bad judgement on my part.

The Joker was not hard to fly.
Old 01-31-2021, 06:35 PM
  #907  
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Sorry for that ...suck!!! , you can order replacement parts from Carf ..I think so.
should be a very hard landing , Carfs model are solids!!
Old 02-03-2021, 10:46 AM
  #908  
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Goodday fellow pilots
I ordered the green pnp joker.
What is the diameter of the wheels of the pnp version? I am planning to install the K85, is a 300ft grass field sufficient?
And last, the macgregor servo's doing the job well?

Thank you!

Last edited by Christiaan22; 02-03-2021 at 11:13 AM.
Old 02-03-2021, 11:17 AM
  #909  
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65mm are what came with mine.
Old 02-03-2021, 11:25 AM
  #910  
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Originally Posted by Christiaan22 View Post
Goodday fellow pilots
I ordered the green pnp joker.
What is the diameter of the wheels of the pnp version? I am planning to install the K85, is a 300ft grass field sufficient?
And last, the macgregor servo's doing the job well?

Thank you!
Not sure what the idle thrust is on a KT 85, but ours with JetCat P-100RX (just over 2 N idle thrust) flies in a 100m grass strip no problem.
All of our are using the MacGregor servos with a Powerbox, so 5.9v They seem happy with that or 6.6 Li-fe

Dave
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Old 02-03-2021, 11:33 AM
  #911  
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Thank You!
Old 02-06-2021, 05:15 AM
  #912  
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Does the pnp version uses the mac2607 or the newer mac2810 servo's? I have ordered the powerbox switch for 6volt operation.

With friendly regards!
Christiaan
Old 02-06-2021, 07:15 AM
  #913  
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It will depend when the kit left the factory. Probably the 2607 like mine which I run on 5.9v

Dave
Old 02-06-2021, 08:04 AM
  #914  
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Just ordered the last pnp in stock from the carf website. We will see, I run at 6volt anyway with the PB switch. Thank you for the reply Dave!
Old 04-05-2021, 04:30 AM
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Cheers!
Desert Fox 1
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Old 05-29-2021, 01:49 PM
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Cheers!
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Old 06-01-2021, 08:59 PM
  #917  
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Hey guys, I just sent my turbine in for its 25hr service, all done in the Joker. while the engine is away I am doing some maintenance stuff. Please feel free to suggest things I should be checking/inspecting during this time. The one thing I do want to ask about is the pipe. My inner pipe is moving around inside the outer pipe. has anyone come across this issue? I forgot to mention this is the stock CARF pipe for the Joker. There is a spring that is surrounding the inner pipe that when new was keeping the inner pipe dead center with no movement. I don't know what changed but the spring no longer holds the inner pipe center and the inner pipe bounces around freely. any suggestions/comments/ideas are welcomed.
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Old 06-01-2021, 11:41 PM
  #918  
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My one still has not many flights, not centered on the outer pipe but spring seems doing some job even if - as told - inner is more close to outer on one side. But this is from day 0 and still good.
Old 06-13-2021, 12:12 PM
  #919  
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Default Flap mixer

Hi, in the mean time, I did a dozen flights not and the K85 is the perfect match for my Joker.
Plane flies so good that Im starting to feel comfortable on this jet.
The only thing Im still having problems with is the elevator to flaps mixer there is so much down needed to prevent the pitch up.
What is the elevator movement that you are using to compensate for the flaps?



kind Regards,

Eric

Last edited by Speedrick; 06-13-2021 at 12:14 PM.
Old 06-13-2021, 12:29 PM
  #920  
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1-2 mm down
Old 06-13-2021, 12:38 PM
  #921  
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Originally Posted by Speedrick View Post
Hi, in the mean time, I did a dozen flights not and the K85 is the perfect match for my Joker.
Plane flies so good that Im starting to feel comfortable on this jet.
The only thing Im still having problems with is the elevator to flaps mixer there is so much down needed to prevent the pitch up.
What is the elevator movement that you are using to compensate for the flaps?



kind Regards,

Eric
Depending on the TX you have.....I always do those with the Flight Mode and I trim (one setting per flight mode) the plane for cruise, take off flaps and landing flaps.....never have to touch it again...
Old 06-14-2021, 05:40 AM
  #922  
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Originally Posted by jcterrettaz View Post
1-2 mm down
are you serious????
Old 06-14-2021, 05:43 AM
  #923  
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Originally Posted by Dansy View Post
Depending on the TX you have.....I always do those with the Flight Mode and I trim (one setting per flight mode) the plane for cruise, take off flaps and landing flaps.....never have to touch it again...
Okay, Im flying since 40 years on Futaba😋
Im interested to see how many down elevator is used at full flaps, and I heard that a lot is needed.
once spoke a Joker pilot, and he told me 8-10mm. 8mm is what Im using, but it still seems not enough🤔


kind Regards,

Eric
Old 06-14-2021, 06:06 AM
  #924  
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My joker needs 6 to 8mm down elevator with full flaps. But you have to watch your speed, too fast and it will still climb.
Old 06-14-2021, 07:19 AM
  #925  
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Originally Posted by Speedrick View Post
Okay, Im flying since 40 years on Futaba😋
Im interested to see how many down elevator is used at full flaps, and I heard that a lot is needed.
once spoke a Joker pilot, and he told me 8-10mm. 8mm is what Im using, but it still seems not enough🤔


kind Regards,

Eric
Do you use Conditions? Most powerful part of Futaba systems. Set 3 identical conditions where everything is the same except the elevator trim is independent and conditions change with flap switch. Take off, trim elevator, go to mid flap and trim elevator, go to landing flap and trim elevator. Don't have to guess on mix ever again.

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