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RE: E-Flight J-3 Cub - 7/12/2006 5:55 AM   
Skyluck


 

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From: Livingston, TX, USA
Status: offline 		Thanks John,
You guys are on a roll with the great new products. Keep it up! And we will see you at SEFF!

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RE: E-Flight J-3 Cub - 7/12/2006 7:22 AM   
COL J



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From: Republic, WA, USA
Status: offline 		I bought the Ultimate BEC from Hobby Lobby. You solder the two battery leads from the BEC to battery leads coming from the ESC and plug the BEC into the battery port on your rcvr. You do have to clip the red BEC wire from the ESC. It works great. Nothing to do but plug the battery into the ESC as before and go. Yes John, I am very very pleased witht he quality of this ARF. I haven't flown it yet though as I am still waiting for the float kit.

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RE: E-Flight J-3 Cub - 7/12/2006 11:24 PM   
bladebender


 

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Status: offline 		i see people are flying the plane let see some more video thanks Rich

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RE: E-Flight J-3 Cub - 7/16/2006 7:41 AM   
COL J



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Status: offline 		For those who built this plane, what are they referring to when they say make sure that the arrow on the struts are up and facing the front of the plane. What arrow are they talking about or have I just lost it? They don't match up to the screw holes on the wings very well.

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RE: E-Flight J-3 Cub - 7/16/2006 8:32 PM   
John Redman


 

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Status: online 		There should be a small arrow on the base of the wign struts. If there isn't (I will check some kits in stock and work that issue with the vendor) just rotate the strut until the holes line up. We have not had an issue with struts not lining up on any of the kits we built. You might have to pull the strut one way or another about 3/34" of an inch but the holes are correct.

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RE: E-Flight J-3 Cub - 7/17/2006 9:15 AM   
makiedog


 

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Status: offline 		I have tried flying this Cub on floats several times. I'm getting plenty of power but find the plane very unstable on the roll axis, especially when banking. Seems to want to snap roll and stall easily. What am I doing wrong? I had the CG located at about 2 5/8" from the leading edge. I was looking for something relaxing to fly on the lake behind the house, but find the Cub too twitchy. I suppose I should give exponential a try, I have never found a need to use it. Hope you guys can share some tips on flying.

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RE: E-Flight J-3 Cub - 7/17/2006 8:00 PM   
John Redman


 

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Status: online 		Are you sure the CG is set at 2 5/8" back from the leading edge? What you are experiencing is what we experienced when the CG was further aft. You could move the CG forward to 2 3/8" behind the leading edge adn see if you like it. Also if you refer to page 48 of the manual it give both high and low rates for control throws as well as exponetial rates. We have found using expo will always make your flying smoother. If you do not use expo I would cut hte rates down to the following and try it again.

Ailerons: 1/2" up and down for high rate and 3/8" up and down for low rate
Elevator: 1/2" up and down for high rate and 3/8" up and down for low rate
Leave the rudder as it states in the book.

If you horse themodel around it will oscillate a fair amount when rolling, this is due to the inertia generated with the large amount of mass under the aircraft. Try rolling the model slower than you normally due and see if this helps.

You never mentioned if the elevator was overly sensitive. If it is not, then my guess is you have too much roll rate or are rolling too fast and creating an inertia issue.

Hope this helps.

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RE: E-Flight J-3 Cub - 7/17/2006 8:13 PM   
COL J



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Status: offline 		I have tried all of the combinations with the struts, turning them over, swapping sides and one is just about 1/2" too long. To get it installed, it has a buckle in it. There is nothing I can do with the wing as it is fixed with the wing bolts and the tab in the front of the wing and I can't really shorten the strut. I guess the only other thing to do is attache it with new holes drilled in the wing and cover the others with Ultracoat.

Thanks

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RE: E-Flight J-3 Cub - 7/18/2006 7:17 AM   
makiedog


 

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Status: offline 		John,
I don't know if the CG can be moved forward much more since my 2X 3s2p 3600 mAh lipo (packaged end-to-end) is almost butting up against the back of the firewall.

Question about CG balancing: I use my finger underneath the wings where the distance from the LE is marked on a piece of tape. When the plane is lifted up, is the fuselage (longitudinal axis) or the wing tip suppose to be horizontally level?

Here's my setup:
eFlite 25 motor
CC Phoenix 45 ESC (using the BEC)
4 MN48 servos
2x 3s2p 3600 mAh 10c lipo from 3E Model

Any help is appreciated. Thanks.

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RE: E-Flight J-3 Cub - 7/18/2006 7:54 AM   
John Redman


 

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Status: online 		You would want the fuselage horizontal axis to be level.

How big is this battery you are using? We have used teh Thunder Power 4200 3S2P and our E-flite 1800 NiMh battery, and both bring the CG right at the point without any issues. If your battery is longer than the 4200 this might be your problem. if your battery is end to end then I am guesing it is around 8 - 9 inches long. If this is the case, I am betting your plane is tailheavy.

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RE: E-Flight J-3 Cub - 7/19/2006 7:09 AM   
makiedog


 

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Status: offline 		Thanks John, I'll try to see if I can rearrange the lipo packs to see if it works better. Although I doubt they'll fit. Incidentally, I flew it without the floats today. It flies fine and had no bad tendencies that are noticeble, even at slow speed.

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RE: E-Flight J-3 Cub - 7/19/2006 7:01 PM   
John Redman


 

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Status: online 		You need to recheck the CG with the floats installed. The floats do have some weight added internally in the nose to maintain the balance, but with teh longer battery pack you might find it needing a little more nose weight. Prather stick on weightsd work greta for that on the bottom of the floats at the nose of the floats.

The CG is not as critical on the J-3 with the floats removed, it can be a little further back. I am guessing this is what you are experiencing.

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RE: E-Flight J-3 Cub - 7/25/2006 3:43 PM   
P-51B



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Status: offline 		So much for drop in ease of the motor. The firewall is set up with 6-32 blind nuts glued in, the recommended e-flite power 25 motor mount has 4-40 holes...something will need to be drilled out.

If I had known that it really wasn't "drop in" I would have probably gotten the power 32.


Why would they have 6-32 blind nuts installed when their own recommeded motor is set up for 4-40?

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RE: E-Flight J-3 Cub - 7/25/2006 9:05 PM   
COL J



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Status: offline 		The same thing with mine. I just drilled the Power 25 mount and installed 6-32's. Still waiting for floats.

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RE: E-Flight J-3 Cub - 7/26/2006 7:03 AM   
John Redman


 

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Status: online 		This was a mistake on my part with the manufacturer. I can assure you it has been taken care of on future Cubs. Just drill ou the mounting holes in the Power 25 X mount and you will be fine.

Believe me the last thing you want is the 32 in this bird, it doesn't need any more power than the 25.

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RE: E-Flight J-3 Cub - 8/7/2006 7:25 AM   
undertaker29


 

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Status: offline 		John, I have the ultra stick 25e on floats. flies great. it has more openings on the front and thus got lots of water in it. Couldnt get a 2nd flight. I have the 32 size motor and in the air, it would not climb very smartly. Plane flew excellently and I am still playing iieth prop and battery config.

It is a well built and very sharp looking plane. I think it will be an even bigger hit than the Cub. Thanks for a great kit.

Do you have any Ideas on waterproofing the electronics (while keep it all cool) ? I have the receiver in a baggie and it seems to be ik. But the batteries and the controller are all exposed...

Thnaks Sam

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RE: E-Flight J-3 Cub - 8/8/2006 6:05 AM   
John Redman


 

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Status: online 		We have not had a problem with any water getting into the front of the plane as you have mentioned. I will say you should not taxi unless you have high rate elevator set and hold full up elevator (values are in the instructions). The larger prop of the Power 32 will suck the water up and around the front of the fuselage if you don't do this. Taxi slow and easy with full up elevator and begin your takeoff run with full up elevator as well. As the model picks up speed begin to release the elevator slowly and she will come up on step very quickly and then you are off. Of course don't dunk the nose, that wouldn't be a good thing.

Try those tips and see how it works for you.

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RE: E-Flight J-3 Cub - 8/18/2006 5:33 AM   
bikerbill29


 

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From: Andrews, TX, USA
Status: offline 		For you guys on a buget out there, thought I would let you know my set up for this bird. I use a Tower Pro 2915-5 Motor, and TP40 Amp ESC, with 2 Apex 2100 3S Lipo's turning a Master Airscrew 10x6 Electric only prop. And I have to say, this has to be one of the best flying little planes I have ever flown. Where I fly is pretty tall grass, so I did put bigger wheels on her, but this thing flys like a dream, and the price is right, less then 200.00 for the power system I use.

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RE: E-Flight J-3 Cub - 8/20/2006 7:16 AM   
makiedog


 

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quote:

ORIGINAL: John Redman

You need to recheck the CG with the floats installed. The floats do have some weight added internally in the nose to maintain the balance, but with teh longer battery pack you might find it needing a little more nose weight. Prather stick on weightsd work greta for that on the bottom of the floats at the nose of the floats.

The CG is not as critical on the J-3 with the floats removed, it can be a little further back. I am guessing this is what you are experiencing.


Well John, you're right!

After having trouble flying with the floats (unstable and pitchy), I had many successful flights on grass. Having gained enough confidence, I decided to give the floats another try. But this time, I reconfigured my 2X 3S1p 1800mAh packs so that they are side by side instead of end-to-end. This shifts the CG farther forward.

I'm happy to report it works real well! The plane no longer exhibits any bad tendencies, it even banks tightly pretty well, a maneuver I've had trouble doing before.

When on floats, it needs to be flown at 3/4 throttle vs 1/2 throttle when on wheels. The 3600 mAh lipo gives me about 11 minutes of duration, burning 80% of it's capacity. Over the past week, I've done 8 flights and I was enjoying every minute of it!

BTW, I am using the CC Phoenix 45 ESC using the integrated BEC for the Rx and never experienced any problems, even in 90 degree weather.

< Message edited by makiedog -- 8/20/2006 7:21 AM >

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RE: E-Flight J-3 Cub - 8/20/2006 9:09 PM   
flyingace451


 

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Status: offline 		Too.........many............planes............must resist.........erge.........to buy.

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RE: E-Flight J-3 Cub - 8/23/2006 5:07 AM   
John Redman


 

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Status: online 		Glad to hear about your sucess. I was a little nervous, had flight tested this thing to the nth degree if you know what I mean, and we have not had a problem.

We have recently been using the Castle 45 amp ESC with great results in the hot weather.

Take care,

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RE: E-Flight J-3 Cub - 8/23/2006 6:04 AM   
rskiba


 

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Status: offline 		I finally finished this plane late last night and test flew it this evening. It flys wonderfully and the Eflite 25 is perfect. I am using 2 - 3s2100 TP packs in parallel. Got 2 flights of about 9 minutes each. By the end of the second flight you could tell the power was decreasing but it never went into throttle cut off. I am using a PHX-35 w/BEC and a Spektrum radio. This combination never missed a beat and it was almost 90 degrees! I am also using the MN-48 servos from JR and for the price they appear to be of great quality.

One thing that disappointed me since the rest of the ARF was nearly perfect - the struts did not really line up well on the pre-drilled holes. I tried flipping ever combinatio to see if there was a left and right, but no joy. I even searched for that little arrow the manual says is there but no - good. Could not find it. I do have the struts on and as I said it flys great, but I was just curious if anyone else might have had this problem?

Enjoy! Thanks John - another great plane by eFlite!

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RE: E-Flight J-3 Cub - 8/23/2006 7:05 PM   
P-51B



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Status: offline 		Mine had the same strut problem. I drilled a new hole in the fuse location on one of them.


I haven't flown mine yet, I have some sort of glitch in the electronics that I need to get worked out first.

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RE: E-Flight J-3 Cub - 8/24/2006 8:42 PM   
makiedog


 

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Status: offline 		I have to say, this is one tough little airplane!

After more than 12 successful flights on floats, I dunked it in the water. Against my better judgement, I flew it in fairly gusty condition, couldn't make up my mind during an aborted loop, resulting in a stall and spin from about 80ft. The nose pointed straight down vertically and spun toward the water. I didn't react quick enough to arrest the spin, it hit the water nose first and 1/3 of the cub (front) stayed submerged for more than 8 minutes till I retrieved it with a kayak.

Here's the only damage: 1 busted cowling and 1 busted float. All other parts are fine, including the wings, motor and prop. To my suprise, all electronics are unscathed when dried. The receiver was protected with a baloon and the CC45 ESC had been waterproofed by Castle Creations 2 weeks prior.

I am absolutely impressed by the tough built and have already ordered the replacement parts. Lesson learnt: the power system is marginal on floats, especially on windy days.

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RE: E-Flight J-3 Cub - 8/24/2006 9:01 PM   
P-51B



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Status: offline 		Waterproffed by Castle Creations? Tell me more about this please.

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