RE: E-flite J-3 Cub 25 ARF  
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RE: E-flite J-3 Cub 25 ARF - 7/31/2006 1:20:15 PM   
Greg Covey



Posts: 4381
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		The E-flite 25 motor attaches to the pre-mounted t-nuts in the firewall. Remember to use some thread locker on these screws as well as the screws holding the X-mount to the motor. I decided not to mount the ESC to the side wall with Velcro (hook and loop) as it is held in position quite well by the thick wires and battery pack. We'll see if this works out during actual use.

The cowl was held in place while I drilled pilot holes for the 4 mounting screws. Some folks like to use masking tape to temporarily hold the cowl in position while drilling.

The prop adapter is designed to fit the APC 12x6 e-prop perfectly without and bushing. The collet design simply presses in place and is then tightened. I use the largest size hex wrench that will fit through the hole in the spinner to tighten it.


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< Message edited by Greg Covey -- 7/31/2006 1:30:33 PM >

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RE: E-flite J-3 Cub 25 ARF - 7/31/2006 1:36:26 PM   
Greg Covey



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Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		I charged the ThunderPower 4200mAh pack with a Cellpro 4s Balancing Charger and ThunderPower to Cellpro Adapter from FMA Direct. All three products are available from Horizon Hobby.

Since this charger can safely recharge the pack in the plane, I mounted the battery with Velcro on the bottom and two Velcro straps. This combination holds the 10oz pack securely in place without any sliding. Note that the fuselage hatch is held in place by two strong magnets.

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< Message edited by Greg Covey -- 7/31/2006 1:41:11 PM >

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RE: E-flite J-3 Cub 25 ARF - 7/31/2006 3:02:08 PM   
Charley


 

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From: Kerrville, TX, USA
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quote:

ORIGINAL: Greg Covey

I charged the ThunderPower 4200mAh pack with a Cellpro 4s Balancing Charger and ThunderPower to Cellpro Adapter from FMA Direct. All three products are available from Horizon Hobby.

SNIP


Whoa! I thought you were going to try the NiMH pack first. Or was that too?

A friend of mine is putting a Cub together. He's using two 2100s in parallel to hold down the battery cost and be able to use them in other E-birds.

CR

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RE: E-flite J-3 Cub 25 ARF - 8/1/2006 2:20:22 PM   
Greg Covey



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Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		Hi Charley,

I haven't tried anything yet...it's only a picture of the mounting scheme and safe charging technique. Keep in mind that two 3-cell 2100mAh ThunderPower packs are no less expensive than a single 3s2p 4200mAh pack.

The struts simply screwed into place using the supplied hardware and pre-tapped holes.


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RE: E-flite J-3 Cub 25 ARF - 8/1/2006 5:33:32 PM   
Greg Covey



Posts: 4381
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		The finished E-flite J3 Cub 25 balanced perfectly with either pack installed and weighed 59oz (3.7lbs) Ready-To-Fly (RTF).

The power system measured 350 watts at 33amps for about 95w/lb which guarantees aerobatic performance.


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RE: E-flite J-3 Cub 25 ARF - 8/1/2006 9:20:55 PM   
Charley


 

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quote:

ORIGINAL: Greg Covey

Hi Charley,

Keep in mind that two 3-cell 2100mAh ThunderPower packs are no less expensive than a single 3s2p 4200mAh pack.




Not necessarily, Greg. Besides, we don't all use Thunder Power packs. I have Kokam & Common Sense packs, some others. Flexibility is also a consideration.

BTW, the two 2100s fit fine if stood on edge.

Looking forward to the flight testing.

Cheers,

CR

< Message edited by Charley -- 8/1/2006 9:22:29 PM >

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RE: E-flite J-3 Cub 25 ARF - 8/3/2006 6:12:22 PM   
donjiskra



Posts: 21
Joined: 8/30/2004
From: Darien, IL, USA
Status: offline 		Greg,
Your step-by-step photos and remarks are excellent.
As always, you are a true master, I learn much from you.

I plan on getting this plane, as a replacement for my Hobby Lobby "Bonnie", which I recently demolished. The "Bonnie" is/was an incredible flyer, especially with floats.
I plan on using the AXI 2820/10 motor that was in the "Bonnie" and the 4200mah lipo, whioch provide 20 minute flights on a 10x7 APC-E prop.

Can't wait to read about your flight review and see te video.

BTW, the gentleman that asked about using skis.
I found that floats work much better, as my experience with skies, showed they tend to dig into light snow.

Thanks Greg, for taking the time to write and provide such great photos with awesome resolution.

Happy flying.
Don

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RE: E-flite J-3 Cub 25 ARF - 8/4/2006 8:37:59 PM   
Greg Covey



Posts: 4381
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		Hi Don,

Thanks. Sorry to hear that your Bonnie 20 met with demise. It is a similar size to the E-flite J3 Cub 25 so you should be a happy R/Cer once again. The .25-size planes have some advantages in that they are manageable by most as an all occasion flier. The quick change floats on the J3 Cub 25 enhances that property even further.

The 10-cell E-flite 1800mAh 4/5A NiMH pack mounts in the same manner as the optional LiPo pack. It adds another 3oz to the flying weight.

The Expert (EXRB100) 4-cell, 4.8v, 720mAh AAA NiMH receiver pack adds another 2oz and is best mounted across the CG as shown when using the LiPo pack. It can also be mounted below the servo tray on top of the framework for the gear mains. When using the 10-cell E-flite NiMH pack that weighs 12.8oz, move the Expert receiver pack aft by about 3" for proper balance.

The Expert receiver pack is used in conjunction with the Expert (EXRA050) Standard Switch with charging cord so you recharge it right in the plane. This eliminates the possibility of a BEC failure under extreme heat, humidity (thicker air), and servo drain conditions. I am not certain if it has been determined that this conditions happens often enough to justify the setup. It is a recommendation by Horizon Hobby for safety due to the specifications of the ESC's BEC output.

The 8% range of flying weight due to various setup is as follows:

  • 59oz (3.7lbs) with LiPo option and using BEC in ESC
  • 62oz (3.9lbs) with NiMH battery pack and using BEC in ESC
  • 64oz (4.0lbs) with NiMH battery pack and using Expert receiver pack



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< Message edited by Greg Covey -- 8/4/2006 8:40:50 PM >

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RE: E-flite J-3 Cub 25 ARF - 8/4/2006 11:34:42 PM   
matt7rc


 

Posts: 1
Joined: 8/4/2006
From: chetek, WI, USA
Status: offline 		i bought the e-flight j-3 cub for its size and looks but i cant get use to batteries so right out of the box i straped a o.s 25 la on her and let me tell you the thing is a blast to fly

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RE: E-flite J-3 Cub 25 ARF - 8/5/2006 3:19:45 AM   
Charley


 

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From: Kerrville, TX, USA
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quote:

ORIGINAL: matt7rc

i bought the e-flight j-3 cub for its size and looks but i cant get use to batteries so right out of the box i straped a o.s 25 la on her and let me tell you the thing is a blast to fly


The word is "strapped."

CR

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RE: E-flite J-3 Cub 25 ARF - 8/5/2006 3:44:00 PM   
Phoenex


 

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Joined: 6/26/2005
From: Champaign, IL, USA
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quote:

ORIGINAL: Charley

quote:

ORIGINAL: matt7rc

i bought the e-flight j-3 cub for its size and looks but i cant get use to batteries so right out of the box i straped a o.s 25 la on her and let me tell you the thing is a blast to fly


The word is "strapped."

CR


This is not an English class forum...get over it

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RE: E-flite J-3 Cub 25 ARF - 8/6/2006 2:56:14 PM   
Charley


 

Posts: 995
Joined: 12/5/2001
From: Kerrville, TX, USA
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quote:

ORIGINAL: phoenex



This is not an English class forum...get over it


You need help too; the word is "phoenix." ;^) Or is that some sort of play on the word?

On a more serious note; I wonder how long it will be before that OS 25 shakes the Cub's nose apart.

CR

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