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CARF Joker build thread

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Old 09-22-2017, 07:58 AM
  #26
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Quote:
Originally Posted by erh7771 View Post
I read it on a translated forum but can't source the link, I'll defer to your first hand account of the speed but I was happy with it and would be cool to see similar installed static thrust and efflux in the smaller Joker with a JF 100 or 110
It flew great and was very impressive for it's size and this was three years ago. Regardless if it went 140 or 180 it flew very nicely.

You need to come to the Jet Jam next year in June. We have a great time and fly from Sun Up to Sun Down
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Old 09-22-2017, 09:05 AM
  #27
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Quote:
Originally Posted by Bob_B View Post
...You need to come to the Jet Jam next year in June. We have a great time and fly from Sun Up to Sun Down
Man I've been literally planning on coming to the jet jam for nearly 3 years but due to health issues I've not been able to make it.

Now officially building and flying model airplanes is part of my medical recovery plan after a brain injury accident. People don't realize how much this hobby can keep the noggin cells moving.

I am currently building a FEJ 1:5.5th scale F-16 EDF and going to use the VASA 145mm.

Perhaps the Joker can be on the list too

Keep fingers crossed
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Old 09-22-2017, 09:13 AM
  #28
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Quote:
Originally Posted by scaryxxl View Post
Dave if you have the joker ready to fly can you post some pics inside the model to check all and see more photos?
I stopped work on it and handed over to the customer. When he finishes we can take shots-if he does not make a complete mess ;-)

I'd love to have done one this week, we have a jet meeting this weekend, but other projects, work and family would not allow anyway

Dave
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Old 09-22-2017, 11:57 AM
  #29
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very nice guys
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Old 10-04-2017, 04:13 AM
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Dave,

I have one of these on the way but since there's no manual yet (at least on CARF's website) I wondered if you knew anything about how the retracts are powered. I'm assuming separate battery but what are the voltage specs? Can the brakes use the same voltage or do I need some sort of regulator to supply two separate voltages for brakes and gear?

Thanks,
Dave Churchill
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Old 10-04-2017, 04:18 AM
  #31
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Dave

The manufacturer says 6V max for both. CARF used a Powerbox Sensor switch to power the radio and the retracts are fed off that as the current is really low.

The 4 pins of the black unit go to the brakes. Polarity doesn’t matter.
The red gear controller has the 3 gear outputs marked. It doesn’t matter which is which, but I think the center one is meant to be nose gear.
Both controllers can be installed so that the connectors from the wing can be plugged directly into the units without an additional connector in between.

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Old 10-04-2017, 04:36 AM
  #32
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Quote:
Originally Posted by Dave Wilshere View Post
Dave

The manufacturer says 6V max for both. CARF used a Powerbox Sensor switch to power the radio and the retracts are fed off that as the current is really low.

The 4 pins of the black unit go to the brakes. Polarity doesn’t matter.
The red gear controller has the 3 gear outputs marked. It doesn’t matter which is which, but I think the center one is meant to be nose gear.
Both controllers can be installed so that the connectors from the wing can be plugged directly into the units without an additional connector in between.

Dave
Thank you sir, much appreciated.

Dave
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Old 10-04-2017, 04:38 AM
  #33
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I have the same gear set in another model. I do not think there is any issue powering the gear through the RX, but I decided to power the gear separately, so only the signal wire goes to the RX.
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Old 10-04-2017, 04:45 AM
  #34
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Thanks Bob, I'll likely do the same.

Dave
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Old 10-04-2017, 05:07 AM
  #35
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Just put a Y lead on one of the Sensor switch outputs and supplied Rx and retracts. The PB switch is completely split so no cross issue

Dave
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Old 10-04-2017, 05:48 AM
  #36
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That begs another question: Both servo's mentioned on CARF's site (Savox 1260 and the Graupner 660) for this jet are HV servos, with fairly high torque ratings at 7.4volts (130-160 oz-in). So I was planning on running 2S LiPo (7.4v), unregulated for Rx/Servos and then a BEC/regulator for the gear/brakes. Is that much torque required for this plane? If not, I'll go with the Sensor switch and some Savox 1250's @ 6.0v (63 oz-in of torque).
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Old 10-04-2017, 07:24 AM
  #37
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CARF are using the servos at 5.9v. Depends on the turbine and flying style. CARF say max 80N

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Old 10-11-2017, 10:31 AM
  #38
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Hi Dave,
I understand you are working on the Joker manual. My Joker came in 2 days ago, is it possible if you can email what you have to drdquy@gmail.com. ?
Regards,
David Quy
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Old 10-11-2017, 10:56 AM
  #39
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David

No, not one of my jobs. I’ll find out where we are on having a manual ready.
If you have any questions I may be able to answer them. Our first one won’t be ready for another week, the owner has passed it on to someone else to finish as he didn’t have time.
only thing that springs to mind is the tailpipe install needs to be understood. You can’t install the bell mouth and then install the pipe. I didn’t see it, but it seems the carbon needs screwing in position with the pipe in the fuselage.
CARFs web page pictures give other clues like the undercarriage packers

Dave
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Old 10-11-2017, 11:38 AM
  #40
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I e-mailed CARF about the manual and Andreas sent this.
Attached Thumbnails
Draft Manual JOKER.pages.pdf  
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Old 10-12-2017, 12:30 AM
  #41
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What kind of speed do you guys expect out of this jet with a K85 installed - Full throttle straigh and level... Around 200Mph/350km/h?
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Old 10-12-2017, 12:33 AM
  #42
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Would be around that, but this is not a speed machine. Its been made without ducts to increase drag and reduce speed. Its an Xcalibur follow on.

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Old 10-12-2017, 12:36 AM
  #43
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Greetings Dave

Ok I see, Im looking at replacing my Jetlegend Viper and thought this might be the jet. Want a faster more precise machine. I guess would have to go for the Ultra Flash then hey.

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Old 10-12-2017, 12:46 AM
  #44
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I'd say it would be faster, certainly more precise. You don't have to fly fast to be smooth and accurate.

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Old 10-12-2017, 05:11 AM
  #45
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What about flight times with a 80N turbine and possibly a slightly larger Kevlar tank made to fit? Could this jet get upwards of 10min or more flights?
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Old 10-12-2017, 05:53 AM
  #46
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Very much doubt it. 7min is about the max on most sport jets.
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Old 10-12-2017, 04:27 PM
  #47
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Quote:
Originally Posted by Dave Wilshere View Post
Would be around that, but this is not a speed machine. Its been made without ducts to increase drag and reduce speed. Its an Xcalibur follow on.

Dave
How will the Joker perform with a P60?
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Old 10-12-2017, 09:22 PM
  #48
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David

P-60 would fly it fine. I have a friend who flys the original design with an early P-60

Dave
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Old 10-14-2017, 09:58 PM
  #49
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Hi Dave,
I am running Savox HV servos and Spektrum 7.4 v packs for my radio. Since the break/retract unit is rated from 7.4v to 8.4 v can I just "y" the battery to power the break unit?
"The elevator servos are held down with the servo hatch. Here, too, a little drop of silicone can act as easy to install spacer between servo and hatch. otherwise use a scrap balsa block to fill the space between servo and hatch". Does that mean I don't need to use the CF tabs to hold the servo down but to use the silicon instead. I wonder why... flutter may be?
"It has shown best for the thrust line to direct the thrust tube so that the top side of the thrust tube contacts the fuselage...." Does he mean to touch the fuse former because you just can't raise the tube up to touch the top of the fuselage with the former in place. I wish some one would post some built pictures!!!
Thanks Dave
David Quy
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Old 10-14-2017, 09:59 PM
  #50
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The JP break unit
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