RE: E-flite J-3 Cub 25 ARF  
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All Forums >> Electric Aircraft Universe >> Electric Aerobatic & Sport Planes >> RE: E-flite J-3 Cub 25 ARF
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RE: E-flite J-3 Cub 25 ARF - 10/23/2006 4:39:53 PM   
xrossbow


 

Posts: 31
Joined: 6/10/2006
From: Spokane, WA, USA
Status: offline 		Thanks Luc. I had been thinking about the Dremel, but kept having nightmares about it slipping and taking off down the wing. :-)

Had to go to town anyway, so picked up some heavier side cutters. Those worked fine and then I worked them down a little more with the Dremel.

I have a little bit of alignment problem on the horizontal between the wing and horizontal stablilizer right now, so trying to work out the best solution on it. The horizontal stab is slightly higher on one side and then the situation is aggravated a little more with the wing.

Finding enough time to stay with it is the big problem. Winter coming and trying ot get everything ready for it. Wonder why I didn't do all these things during the summer.

(in reply to lthibault)
       Post #: 226

RE: E-flite J-3 Cub 25 ARF - 10/31/2006 1:28:15 AM   
Tall Texan



Posts: 127
Joined: 5/14/2002
From: Republic, WA, USA
Status: offline 		Xrossbow,

I live right on Lake Curlew. We have a house on a point so that is where I fly. Otherwise, I fly at the Republic airport which is about 2 mi from me. Haven't been on this fourm much latley as I am now building the TopFlite Beech Staggerwing.

(in reply to lthibault)
       Post #: 227

RE: E-flite J-3 Cub 25 ARF - 11/2/2006 3:49:17 AM   
crazy_8


 

Posts: 3
Joined: 5/26/2004
From: Douglasville, GA, USA
Status: offline 		just a few questions please, I am ordering a 6 ch radio that is being sent with futaba 3110's. They say they are rated at 22 oz. Will this be enough for the cub? If not what would be good? One more thing, the thunder power lipo that is recommended with the kit is rated at much more than 40A. How is this not frying the esc. I will prob run 2 2200 lipos together just dont want to pay for the 40A if I need something bigger, gonna run the power 25. Not planning on the floats for right now but you never know....

(in reply to PaulG-RC)
       Post #: 228

RE: E-flite J-3 Cub 25 ARF - 11/2/2006 10:46:39 AM   
Glacier Girl



Posts: 7003
Joined: 7/9/2004
From: SomewhereIn, PA, USA
Status: offline 		The servos may be a little on the light side for the Cub. I run Hitec 81's in mine, 36 oz of power. As for the battery, 40 amps is it's max out put, the most it can put out with out damage to the pack. No concern with the esc, it will only pull what it's rated for, if the motor demands more the esc is going to shut down. The two 2200 paralleled should work out ok. The 2 packs paralleled even if they are only 10c rated is going to give you 44 amps of available power.

EDIT: Just thought of something, you didn't mention what size esc you are using. If it's rated higher then the packs capabilities then yes you could run into a situation where due to set up problem or motor problem you could over tax the pack.

< Message edited by Glacier Girl -- 11/2/2006 11:40:37 AM >

_____________________________

"The Missing Man Formation"
Looking heavenward you cannot help but shed a tear...mornful...lonesome...a hole that screams out almost as loudly as the roar of the engines that pass over head.

(in reply to crazy_8)
       Post #: 229

RE: E-flite J-3 Cub 25 ARF - 11/2/2006 11:47:36 AM   
Glacier Girl



Posts: 7003
Joined: 7/9/2004
From: SomewhereIn, PA, USA
Status: offline 		UPDATE: Something to look out for. Mine met the ground a lot harder then planned last night. Rear strut on the landing gear decided to let go. Post landing inspection showed it was just barely connected to the main strut, really poor solder/braze job. Results: Tire rotated backwards, broken wing strut, broken prop, boogered up cowling and spaghetti landing gear.
Might want to look at yours, I'm going to rebraze my new ones just to be sure.

_____________________________

"The Missing Man Formation"
Looking heavenward you cannot help but shed a tear...mornful...lonesome...a hole that screams out almost as loudly as the roar of the engines that pass over head.

(in reply to Glacier Girl)
       Post #: 230

RE: E-flite J-3 Cub 25 ARF - 11/2/2006 4:28:32 PM   
crazy_8


 

Posts: 3
Joined: 5/26/2004
From: Douglasville, GA, USA
Status: offline 		Thanks for the info, ordering the 81 metal gears now. I have ordered the power 25 and the e-flight 40a esc with the 12x6 prop. Gonna re solder the landing gear also now. Thanks for the tip as Im sure I will have some harder than wanted landings

(in reply to Glacier Girl)
       Post #: 231

RE: E-flite J-3 Cub 25 ARF - 11/3/2006 11:55:44 AM   
Glacier Girl



Posts: 7003
Joined: 7/9/2004
From: SomewhereIn, PA, USA
Status: offline 		Crazy 8,
Just remember the warnings on the esc!!!!!!!!!!!!!!!!! They don't like to get hot.

_____________________________

"The Missing Man Formation"
Looking heavenward you cannot help but shed a tear...mornful...lonesome...a hole that screams out almost as loudly as the roar of the engines that pass over head.

(in reply to crazy_8)
       Post #: 232

RE: E-flite J-3 Cub 25 ARF - 11/12/2006 3:45:13 AM   
xrossbow


 

Posts: 31
Joined: 6/10/2006
From: Spokane, WA, USA
Status: offline 		Ready for Maiden Flight

But awfully windy, so another day.

Finally got the J3 ready. Added some of the mods discussed in the thread.

Paul and Luc, I added the bungee struts, but slightly different in securing the strut wires under the fuse. Shaped some plastic pieces to the same size as the landing gear nylon straps, left a slot between them for the bungee strut wires.

Customized the front of the cowl area for cooling. Raided the wife’s sewing room for some small pins to add around the center air hole to sim bolts.

A little pin striping for door area.

Props……………… currently have the recommended 12x6. Any reason to drop down to a 11x7 or 10x6. Current draw seems to be in ok range during a bench test with the 12x6.


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(in reply to Glacier Girl)
       Post #: 233

RE: E-flite J-3 Cub 25 ARF - 11/12/2006 3:51:49 AM   
xrossbow


 

Posts: 31
Joined: 6/10/2006
From: Spokane, WA, USA
Status: offline 		Tall Texan

That's a pretty area up there. I go that route once in while on my way to Okanogan to visit folks.

What do you have for hobby stores up that way? Many fliers in the area?

(in reply to xrossbow)
       Post #: 234

RE: E-flite J-3 Cub 25 ARF - 11/14/2006 3:42:37 AM   
lthibault



Posts: 358
Joined: 1/9/2005
From: Gatineau, QC, CANADA
Status: offline 		Hi,

Update: Had to order a new cowling and front windshield, broke a couple of props. Reinforced the wing area where the screws meet the blindnuts. Structure is very fragile and will brake if one of the wing tips hit the ground.

I must say: I own quite a few airplanes, both electric and gas, many warbirds. This one is a real challenge for take-off.

As I had a day off today I went to the club and used a single 4200 MHA Lipo to practice take-off. It is an asphalt runway.

Finally got the plane airborned after about 7-8 trials. With the second Lipo, I tried a more agressive approach, i.e. adding power while I was slowly releasing the elevator...looked like it was ok but suddenly snapped to the right and went nose down in the mud.

I'm beginning to be suspicious about the fact that you can't find any ground take-off video of this product .

Or should I put on the floats and use it mainly on water?

- An RC pilot who's starting to become frustrated with this J3-Cub lesson...

_____________________________

Luc

(in reply to xrossbow)
       Post #: 235

RE: E-flite J-3 Cub 25 ARF - 11/16/2006 1:58:16 PM   
makiedog


 

Posts: 13
Joined: 10/27/2003
From: Mpls, MN, USA
Status: offline 		Having flown this thing both on land and water, I agree, its much more tricky to take off on land, probably due to the short tail. It is much more managable if power is applied very gradually, as well as holding some right rudder (using exponential helps). Otherwise, it will snap to the left. On water, it is much easier, since the floats keeps it fairly straight. I find no difference in flight characteristics when the plane is flown with the extra vertical tail fin, therefore I leave it off- helps keep the CG forward.

I do have an issue with the covering, which seems to wrinkle up every so often, requiring me to use a heat gun to keep it taut. Anyone has this problem?

(in reply to lthibault)
       Post #: 236

RE: E-flite J-3 Cub 25 ARF - 11/16/2006 6:24:26 PM   
lthibault



Posts: 358
Joined: 1/9/2005
From: Gatineau, QC, CANADA
Status: offline 		Makiedog,

thanks for the info, you're confirming my assumptions. I'm also suspecting that the short tail is a major factor for those habits.

I don't really mind because the first reason to choose this product was to add a seaplane to my collection. So far my plan was to practice as much as possible on ground before moving on but I find it useless to persevere and run the risk of other snaps and crashes. Will then put on the floats and use it mainly at the lake.

Concerning covering, I didn't really notice that but I'm used to fixing up covering on my planes with the heat gun / iron.



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Luc

(in reply to makiedog)
       Post #: 237

RE: E-flite J-3 Cub 25 ARF - 11/17/2006 6:29:33 AM   
jcflysrc



Posts: 1118
Joined: 11/9/2002
From: Houston, TX, USA
Status: offline 		Relax the elevator as soon as the tail begins to fly, slowly, smoothly building speed until you reach flying speed. Stay on the rudder. Cubs fly much better when you use the rudder. Especially when taking off. Cubs require good tail dragger skills.

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It's all fun & games...till sombody gets hurt!

(in reply to lthibault)
       Post #: 238

RE: E-flite J-3 Cub 25 ARF - 11/18/2006 5:05:35 AM   
lthibault



Posts: 358
Joined: 1/9/2005
From: Gatineau, QC, CANADA
Status: offline 		Gents,

My cub has now ended his land-based activities and is beeing permanently converted to a seaplane.

Some of you folks starting to build this kit or having to replace the cowling may appreciate this technique. By simply drilling two holes at the location shown on the photos, adding blind nuts with a tiny bit of epoxy to fix them good, I was able to use only two screws to hold the cowling and it is very strong and solid.

Also decide to use yellow tissue to protect ESC and electronics from water. Still allows some air to flow.





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< Message edited by lthibault -- 11/19/2006 11:20:01 AM >

_____________________________

Luc

(in reply to jcflysrc)
       Post #: 239

RE: E-flite J-3 Cub 25 ARF - 11/23/2006 7:23:34 AM   
lthibault



Posts: 358
Joined: 1/9/2005
From: Gatineau, QC, CANADA
Status: offline 		Finally choose another way to isolate the battery compartment. Used covering on the hatch, added a