CARF Joker build thread
05-19-2019, 09:15 PM
#653
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.
05-20-2019, 04:46 AM
#654
My Feedback: (53)
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.
05-20-2019, 07:40 AM
#655
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?
05-20-2019, 07:48 AM
#656
My Feedback: (21)
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
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
05-20-2019, 08:02 AM
#657
Thread Starter
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.
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.
05-28-2019, 02:46 AM
#658
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
06-17-2019, 02:09 AM
#661
Join Date: Dec 2010
Location: , SINGAPORE
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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.
06-17-2019, 04:14 AM
#662
Thread Starter
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
Dave
06-17-2019, 06:45 AM
#663
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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.
06-20-2019, 09:16 PM
#667
Thread Starter
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
There is a big balance shift and this is where a gyro helps.
Dave
not as fast as turbine version
06-23-2019, 04:42 PM
#674
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.
07-04-2019, 02:46 PM
#675
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)