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CARF Joker build thread

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CARF Joker build thread

Old 05-19-2019, 12:38 PM
  #651  
Dave Wilshere
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Fun x2
Old 05-19-2019, 08:35 PM
  #652  
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Congratulations
Old 05-19-2019, 09:15 PM
  #653  
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Hey guys, glad to hear everyone is enjoying their Jokers. I am enjoying mine and had 3 flight today. Today's flight brought my total to 33 flights so far. Unfortunately after the last flight we discovered the bearings in the wheels of the main gear have gone bad. Yes, both wheels. My question is their anyone who has encountered this and if so, do you know the size of the bearings? Yes I am being lazy, I know I can measure but my second question is how do I remove the bearings from the wheels so I can measure them? I have not disassembled anything yet but I don't think those bearings are just going to slide out. Thanks in advance for your suggestions.
Old 05-20-2019, 04:46 AM
  #654  
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Originally Posted by pcskyhi View Post
Hey guys, glad to hear everyone is enjoying their Jokers. I am enjoying mine and had 3 flight today. Today's flight brought my total to 33 flights so far. Unfortunately after the last flight we discovered the bearings in the wheels of the main gear have gone bad. Yes, both wheels. My question is their anyone who has encountered this and if so, do you know the size of the bearings? Yes I am being lazy, I know I can measure but my second question is how do I remove the bearings from the wheels so I can measure them? I have not disassembled anything yet but I don't think those bearings are just going to slide out. Thanks in advance for your suggestions.
If you used the JP retract? Yes they will probably just slide out....the JP wheels that I have taken apart did....for the most part, no press needed LOL
Old 05-20-2019, 07:40 AM
  #655  
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Originally Posted by Dansy View Post
If you used the JP retract? Yes they will probably just slide out....the JP wheels that I have taken apart did....for the most part, no press needed LOL
Yeah, I should have mentioned that they are the JP hobby retracts. I assumed that was on all the Jokers since the retracts come with the kit and are already installed. I took a moment this morning and took one of the main wheels off and sure enough the front bearing came off with the axle. For future reference the bearing size is 5mmX8mmX2.5mm. Should I look at just replacing with the same old bearing or is there a certain type I should upgrade to? I also would like to add a tool to my tool box. It is called a inner bearing puller. There are many out there for auto work but does anyone know of one that would pull small bearings such as this one and other small bearings we come across in our hobby endeavors?
Old 05-20-2019, 07:48 AM
  #656  
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Originally Posted by Dave Wilshere View Post

Fun x2
Dave,

First congrats to Phil and the success of the maiden and the first six flights on his new Joker. I have a question concerning the pipe, since Phil and yourself are both using turbines at the 100N rating, have you both used the stock pipe? or a pipe from another manufacture? Also since you both are using 100n turbines are you setting the turbine exhaust cone at the recommended distance as per the turbine manufacture? or is it optimized to the airframe when looking at inlet duct size? I ask since one of these is going to be added the hanger in the not to distant future.

Robert
Old 05-20-2019, 08:02 AM
  #657  
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Wheels. I'm at 60+ flights and wheels are all still good. Ballraces don't take shocks well, so it does not surprise me they could break up. almost half my flights are on grass, which is much easier on the bearings.

Tail pipe is stock, most of the Jokers flying in the UK are with 100N turbines (even though CARF don't recommend it through fear of the throttle 'switch' pilots) our guys don't fly full power, just using the extra thrust on verticals and throttling for cruise. The stock tank easily gives 6 1/2 minute flying like that.
Tail cone gap is the same whatever the turbine you fit. In this class of model 25mm is about perfect.
Paul Baker has the P-60SE for now and really the tail pipe is too large for this turbine-he has not changed as sometime he will probably swap to a P-100Rx like most of us. Steve Haughty actually has a JM 90 in his red Joker, we will see how his goes this coming weekend.
Old 05-28-2019, 02:46 AM
  #658  
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There was three flying at a recent JMA meeting at Westonzoyland, Dave W, Steve H,and Paul B's a nice and easy to transport jet, good performance, and low maintenance, just fuel and fly.

Alistair Powers
Old 05-28-2019, 03:25 AM
  #659  
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thanks for the infos, im planning to maiden my Joker this week , so far our spring is horrible with ton of rain... the grass is tick ..I can not miss our narrow runway!!!
Old 06-07-2019, 11:49 AM
  #660  
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Today I maiden my Joker , to much ailerons movement and the jet was very alive , but manage to calm down ...flap make the nose pitching to much , I landed after 7 minutes with out flaps, landing was very easy .
Next flight will be better...
Old 06-17-2019, 02:09 AM
  #661  
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Originally Posted by jcterrettaz View Post

Today I maiden my Joker , to much ailerons movement and the jet was very alive , but manage to calm down ...flap make the nose pitching to much , I landed after 7 minutes with out flaps, landing was very easy .
Next flight will be better...
Congratulations! Mine pitched up like crazy when flaps were deployed, forced me to attempt landing without flaps but were too hot to execute. In the end I use them and quickly trimmed my elevators. My runway was just 130m long with only 80m usable.
Old 06-17-2019, 04:14 AM
  #662  
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Its says on the instruction sheet that 5mm down will be required with full flap...thats the case and if you do not add it then it will pitch up!

Dave
Old 06-17-2019, 06:45 AM
  #663  
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Originally Posted by Dave Wilshere View Post
Its says on the instruction sheet that 5mm down will be required with full flap...thats the case and if you do not add it then it will pitch up!

Dave
absolutely correct. Thatís what happens if we donít read the manual thoroughly 😄
Old 06-17-2019, 10:41 AM
  #664  
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����
Old 06-17-2019, 05:16 PM
  #665  
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Thanks you
Second flights todays , was tail heavy first flight , flew like my Spark but much faster ...
great little jet

Last edited by jcterrettaz; 06-17-2019 at 05:17 PM. Reason: missing
Old 06-20-2019, 06:04 PM
  #666  
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Any thoughts on CG from those that have flown their Jokers? Mine balances at 180mm with the uat full. My only slight concern is I had to move my tank up a little to accommodate the k100 so will be landing a little nose heavy compared to the recommended turbine. If I add roughly 15-20% fuel to the tank to simulate landing, it needs about 2.75 ounces in the tail to balance at 180mm.
Old 06-20-2019, 09:16 PM
  #667  
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If you read through the thread you have nothing to worry about, people are flying the Joker between 170 and 185mm. These figures are a little varied as different people have differing amounts of fuel on board when they balance, but I say balance it with UAT full and tank with landing amount of fuel at 185mm. Because of the round tank you can land with just enough to cover the felt clunk and it’s fine, the tank will completely empty flying circuits, bone dry.
There is a big balance shift and this is where a gyro helps.

Dave

Old 06-21-2019, 12:05 PM
  #668  
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Default E Joker

Built and painted this Joker with a DS98 for power. Flying weight is 20.5 lbs
14S 8000ís

Old 06-21-2019, 12:40 PM
  #669  
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Nice sound for an EDF not as fast as turbine version
Very nice Bob you still love fast machine....
Old 06-21-2019, 03:02 PM
  #670  
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Oh you might be surprised!
Old 06-22-2019, 05:15 PM
  #671  
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3 flights today. Flies amazingly well. The k100 is enough power 😁
Old 06-22-2019, 06:25 PM
  #672  
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A few passes of the maiden caught by Bret B, Mr XB70... Fastest pass on maiden was about 75% throttle.

https://youtu.be/vq1lpgQpkvk
Old 06-23-2019, 03:56 AM
  #673  
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What a great day we had yesterday!
Old 06-23-2019, 04:42 PM
  #674  
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Yesterday the Joker and I had our waiver flight. As usual the Joker was calm and smooth without worry. I on the other hand was a nervous wreck but the Joker got me through it. Mother Nature also blessed me with mild wind during the flight. Right after my waiver flight mother nature turned the volume up on the wind up. As I said before the Joker is my first turbine and based on my experience I would tell anyone who is looking to get into turbines this is an excellent entry turbine model. I only had a couple of wing scrapes but it was because of mistakes I made on landing and had nothing to do with the characteristics of the Joker. Although I passed the flight test I know I have a lot more to learn and still need a lot more flight time. I look forward to getting many more flights on the Joker and continue my education in the turbine arena.
Old 07-04-2019, 02:46 PM
  #675  
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today I was flying my Joker and I see smoke coming off my wing ...oups landing
One of the flap servo completely burnt , for no reason ( I'm using 6.6 V Life battery forth RX)
Lucky was not an aileron servo ...anyone has the same problem?
I will use two Hitec servos on flaps instead and wait from the rep answer ( I ask him to contact Carf)

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