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CARF Joker build thread

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Old 09-20-2017, 02:54 AM
  #1
Dave Wilshere
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Default CARF Joker build thread

I collected two Joker kits at JP and although I don't really have time to build one atm I've started one a friend is having, doing the jobs he will make a mess of :-)

The canopy glass fit is easy, what you see here is the process and dry-No glue yet, fit in the frame.
The model has some nice detail, tank mount done for the round tank, removable radio/servo plate. Access is good.

Quality is great on this kit, amazing value
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Old 09-20-2017, 04:19 AM
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OK, I've built the tank too, so Mark is hopefully good to finish the rest, I have also test fitted the MacGregor 2607 servo we will use. 7kg 26g, metal geared, they are a perfect fit.
Tank. Dubro soldered barbs, M&R Hi Flow felt clunk, tygon tube clunk line. I put a few hundred ml of meths in the tank to flush out any dust. The felt clunk is assembled and a clean syringe is attached and rapidly drawn out to suck any loose debris inside the clunk from assembly. The tygon is retained at each end by a ring of tygon tube to clamp it down. The overflow pipe is extended with another piece of tygon, the top cut in a V so it can't seal on the top wall. Tubes on the tank bung are blasted clean inside with a shot of CA kicker (aerosol type)
Lastly the tank is pressurised with my mouth and sealed with a loop of tygon. This will be left overnight and the pipe pulled off to check there was still pressure. Done!
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Old 09-20-2017, 07:49 AM
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Great dave, mine arrived yesterday... what size turbine are you using?
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Old 09-20-2017, 07:55 AM
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Looks good, but when does the EDF build thread begin?
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Old 09-20-2017, 08:07 AM
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SM68. This one is for a customer, he will either use a P-60 or P-100Rx.

Bob...when everything else is done! Mephisto build needs finishing and I have a SM A-10 to build for a customer!!

Dave
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Old 09-20-2017, 09:35 AM
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Well you best get busy and off the net!
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Old 09-20-2017, 02:39 PM
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Quote:
Originally Posted by Dave Wilshere View Post
SM68. This one is for a customer, he will either use a P-60 or P-100Rx.

Bob...when everything else is done! Mephisto build needs finishing and I have a SM A-10 to build for a customer!!

Dave
Is there enough room you could fit an older P80 in there ?
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Old 09-20-2017, 09:07 PM
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No, old P-70 is the largest turbine that would fit. It was designed to stop people putting 120-140 turbines in it.
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Old 09-21-2017, 04:12 AM
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What's the capacity of the fuel tank please?

Thanks, Tassos
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Old 09-21-2017, 04:47 AM
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Just over 2ltrs.
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Old 09-21-2017, 07:56 AM
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Is there intake ducting or just holes up front?

Zb
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Old 09-21-2017, 07:59 AM
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Quote:
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Is there intake ducting or just holes up front?

Zb
Just the opening, but it would be easy to create ducting on a 3D printer to bring air back to the fan.
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Old 09-21-2017, 08:38 AM
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hi there guys!
here is my joker fresh from Jetpower.
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Old 09-22-2017, 02:49 AM
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I've already been asked these questions :-)

Balance I'd put at 180mm back with a small amount of fuel in the main tank Gear down.
Elevator 15mm up 16mm down. Ailerons 14mm up and 16mm down (expo on both 30%) Rudder max you can get which is 30-35mm I think.
Flaps 20mm take-off and as much as you can get landing. Down elevator needed 1mm take off and 3-4mm on landing.

Manual is coming
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Old 09-22-2017, 03:03 AM
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Scary is the green as vibrant and dark as your photos show online? If so I really like the looks of that color.
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Old 09-22-2017, 03:06 AM
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hi Bob
the green is the same one that appears in official site of carf, my photos are little dark because of light.
but is the real batman's joker clour
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Old 09-22-2017, 03:07 AM
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Quote:
Originally Posted by Dave Wilshere View Post
I've already been asked these questions :-)

Balance I'd put at 180mm back with a small amount of fuel in the main tank Gear down.
Elevator 15mm up 16mm down. Ailerons 14mm up and 16mm down (expo on both 30%) Rudder max you can get which is 30-35mm I think.
Flaps 20mm take-off and as much as you can get landing. Down elevator needed 1mm take off and 3-4mm on landing.

Manual is coming

Hi Dave this info is the official from carf? or your own setup?
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Old 09-22-2017, 05:05 AM
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...

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Old 09-22-2017, 05:23 AM
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Set up is my experience with this aeroplane.

Yes, the gear would normally be installed, but these first 7 kits the gear did not arrive in time before the container left...plus I would take out to check screws and coat wood in resin...so I'm glad!
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Old 09-22-2017, 06:15 AM
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Do you mind weighing the bare airframe?

Looks like a JF 100 will fit in there easy
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Old 09-22-2017, 06:21 AM
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Quote:
Originally Posted by erh7771 View Post
Do you mind weighing the bare airframe?

Looks like a JF 100 will fit in there easy
It will fly on the JF but I would not have the performance I would be happy with. This is a large model
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Old 09-22-2017, 06:55 AM
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Quote:
Originally Posted by Bob_B View Post
It will fly on the JF but I would not have the performance I would be happy with. This is a large model
Nice thing about Carf sport models is they don't need a lot of thrust energy to go fast, here's the larger model Carf flash that can fly close to 180 mph top speed with only 16 lbs of thrust installed from EDF ... starts around 4:50


JF 100 on 5000 14s is over 16lbs of thrust installed and efflux in the 240 mph with 780kv HET and this is a smaller plane

Great candidate for EDF for me

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Old 09-22-2017, 07:01 AM
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Not sure where you get the idea that the flash in the video was doing 180? Trust me on this, it flew very nice, but more in the 130-140 range which was quite fast!
I am the CD of this meet and had first hand experience watching it fly, with interest.
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Old 09-22-2017, 07:54 AM
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Quote:
Originally Posted by Bob_B View Post
Not sure where you get the idea that the flash in the video was doing 180? Trust me on this, it flew very nice, but more in the 130-140 range which was quite fast!
I am the CD of this meet and had first hand experience watching it fly, with interest.
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
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Old 09-22-2017, 07:55 AM
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Dave if you have the joker ready to fly can you post some pics inside the model to check all and see more photos?
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