RE: E-flite J-3 Cub 25 ARF

RE: E-flite J-3 Cub 25 ARF
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RE: E-flite J-3 Cub 25 ARF - 5/22/2007 3:39:02 AM

Posts: 57
Joined: 11/15/2006
From: Deerfield Beach, FL, USA
Status: offline

You can run the ESC with the 3s 11.1 volts but like the last response stated you may burn up the 40 amp esc from eflite. I went with a bigger esc 60 amp which is recommended for the power 32 motor. I would go for a 60 amp esc or run it as a BEC. I have had no heat issues with mine. I will try and get you some pics. Like I mentioned before most ESC will only allow 3s batteries, if you are going to run a 4s battery you need to use a BEC set up

(in reply to lthibault)

RE: E-flite J-3 Cub 25 ARF - 5/22/2007 8:42:39 AM

zzz12

Posts: 127
Joined: 1/10/2007
From: rugby, UNITED KINGDOM
Status: offline

Thanks for your help . Could you put some pics of the way you wired the battery motor and receiver, 40-amp speed control. into the plane. So i can see.

(in reply to lthibault)

RE: E-flite J-3 Cub 25 ARF - 5/24/2007 8:16:05 PM

Posts: 57
Joined: 1/15/2007
From: Toronto, ON, CANADA
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I am planning on maidening my J-3 on floats this weekend. I have never flown it. I have a lot of experience on a 3 channel HZ Super Cub so needless to say I am quite nervous about this first flight on a much bigger/more powerful plane. Any last minute advice from any of you flying it on floats. Thanks!

(in reply to zzz12)

RE: E-flite J-3 Cub 25 ARF - 5/25/2007 12:04:35 AM

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

It is much easier than pavement take-off! I'd recommend to follow the instruction manual, use a lot of up elevator at the beginning, slowly level it and it will take-off very graciously.

Just remember to modify the battery hatch; put some masking tape to cover the holes to prevent water from entering the ESC, I personnaly decided to put yellow cover on it. Your choice.

< Message edited by lthibault -- 5/25/2007 2:09:30 AM >

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Luc

(in reply to hobiecatlob)

RE: E-flite J-3 Cub 25 ARF - 5/25/2007 3:01:43 AM

Posts: 57
Joined: 11/15/2006
From: Deerfield Beach, FL, USA
Status: offline

I wanted to add to be careful about over banking, I crashed my first cub over banking it in a turn and it ended up cross control stalling and slaming into the lake. Yes a new cub was inorder. I luckly saved all of the electonics and dryed them out. So far no problems with my new cub about five flights on it. Also be carful about the amount of travel of each control surface. Set them up like the manual suggests. I had my high at full throw , this I found out later was too much. The guy at the hobby store said it would be OK at full travel, NOT!! The cub did the exact manuever they talk about in the back of the Maunual about overbanking and pulling back on the elevator. Other than that just the cub flies great. Just take it easy , unlike me, your first time out just box patterns at first. Good Luck.

(in reply to lthibault)

RE: E-flite J-3 Cub 25 ARF - 5/26/2007 9:35:05 AM

zzz12

Posts: 127
Joined: 1/10/2007
From: rugby, UNITED KINGDOM
Status: offline

Can you help how do you stop the BEC from working on the E-flite 40 Amp Brushless ESC. Which wire do you cut. So i can power the servo with one battery and have the Li-po power the motor. Thanks

(in reply to Falconjet50)

RE: E-flite J-3 Cub 25 ARF - 5/26/2007 3:05:55 PM

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

I use a Castle Creations 45. It's the red wire on it, center wire in this case.

But I don't cut it. Using a small screw driver, very gently lift the little plastic retaining finger in the connector that holds the red wire in and pull the wire and metal contact out. Insulate that wire with heat shrink or tape. This way you can re-use it for bec if you so choose.

Another choice might be to use a short servo extension cable and cut the wire in it. That way you haven't damaged the wire on your esc. But I use the first method.

(in reply to zzz12)

RE: E-flite J-3 Cub 25 ARF - 5/29/2007 3:35:09 PM

P-51B

Posts: 6176
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
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Well, I finally got to maiden my cubby with the 25 on it this weekend.

The take off was, shall we say hair raising! Once in the air it flew nicely, and could readily be put into a spin. I also learned that the CG range is large. I had a new pak in it...that I forgot to put velcro on the bottom of. Well, the velcro holding strap allowed the pack to slide all the way back to the servos putting the CG about an ince behind the back of the recommended range, but the plane still handled well (as I found this after landing). The 25 seemed to be good power for it. It would climb vertically for quite a while, and I could easily power out of trouble that I put it into to test this.

The second flight...still had a hair raising takeoff. The landings are beautiful, it really likes to come in on the mains!

I went home and put the floats on it last night. Weather permitting it will get is float maiden this Sunday at one of my clubs picnics. Oh, it will also be my first time flying off water!

I haven't mounted the extra vertical stabilizer (under the fuze) yet, is it really needed on the cub with floats?

_____________________________

In order to think "outside the box", one must first accept there IS a box.

(in reply to xrossbow)

RE: E-flite J-3 Cub 25 ARF - 5/29/2007 10:53:44 PM

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Joined: 1/15/2007
From: Toronto, ON, CANADA
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I maidened mine last weekend and it was great. I had to make a fairly large CG adjustmust as during my first flight it was hard to keep level but after that it was great. Be careful of tight banks, I lost it once doing that - some damage but I've already repaired it. One thing as well I found is that it is good to apply the power quickly from a standstill on the water to get it quickly up on the step, it is far more controllable like that.

Have fun with your maiden on water, I sure had a blast with it!!!

(in reply to P-51B)

RE: E-flite J-3 Cub 25 ARF - 5/30/2007 9:52:48 AM

zzz12

Posts: 127
Joined: 1/10/2007
From: rugby, UNITED KINGDOM
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Thanks for the help xrossbow will do that

(in reply to hobiecatlob)

RE: E-flite J-3 Cub 25 ARF - 5/30/2007 2:26:10 PM

Posts: 57
Joined: 11/15/2006
From: Deerfield Beach, FL, USA
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When flying off floats let the cub accellerate a little faster than you would on wheel. Slowly pull back on the elevator. The important things is that you let it accellerate in ground effect ,about one wing span length above the surface, until the cub starts to fly. If you pull it into the air and try to climb before proper airspeed has been acheived , you may stall spin the cub. I have found that even with the Power 32 ungraded motor I put in it is still a little squirrely on take off, once in the air at a safe altitude it flies great. Just be very patinet on take off. Try not to turn the cub once in the air let it fly straingt ahead. IF you start a turn you will lose some horizontal componate of lift that could aggrevate a stall condition. On Landings, Learn to fly the Cub in slow flight. On landing in the water you do not want to come screeming in. It will hit the water and porpose throuhgtout the landing and can flip over. Once on the water make sure you use rudder to control and not too much aileron and you can catch a wing tip . I live on a lake which has a Cessna 182 on floats and I watch him on take off and his procedure is the same as the one required for our model flying. The floats are not light, it takes a significant more lift to get the J-3 airborn and the very last thing is to remeber to breath and have fun!!

(in reply to zzz12)

RE: E-flite J-3 Cub 25 ARF - 5/31/2007 11:30:32 PM

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Joined: 5/7/2006
From: , AUSTRALIA
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Geez, I was going to maiden mine today, might have to give it a miss, seeing as I tought myself to fly again using low/mid wing aerobats (extras etc) its been 16 years since I have flown a high wing....

(in reply to Falconjet50)

RE: E-flite J-3 Cub 25 ARF - 6/2/2007 8:26:15 PM

Posts: 57
Joined: 1/15/2007
From: Toronto, ON, CANADA
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Hi all,

I think this question has been asked on this thread before but I can't find it. Do you think the wing struts are critical to the structural integrity of the wings or are they just to look scale? I would prefer not to use them but I don't want to do that if it is risky.

This is my second weekend using the J3 on floats. I absolutley love it. I am still tweaking the CG, trims, control throws etc.

On my last flight I really noticed the snap stall they refer to in the back of the manual. I think it was because I was flying using 50% power to lengthen my flight time. I will cruise at about 65% on my next flights and see how it does. With good throttle mgmt I am getting about 16-17 minute flights with a 11.1V 4000 mAh.

(in reply to isamike)

RE: E-flite J-3 Cub 25 ARF - 6/4/2007 3:22:13 PM

P-51B

Posts: 6176
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
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quote:

ORIGINAL: hobiecatlob

Hi all,

I think this question has been asked on this thread before but I can't find it. Do you think the wing struts are critical to the structural integrity of the wings or are they just to look scale? I would prefer not to use them but I don't want to do that if it is risky.

The wing struts are decorative on this plane. I flew mine the first few times without them. I put them on after verifying the flight performance, since I can leave it assembeled for transport.

_____________________________

In order to think "outside the box", one must first accept there IS a box.

(in reply to hobiecatlob)

RE: E-flite J-3 Cub 25 ARF - 6/4/2007 6:28:56 PM

P-51B

Posts: 6176
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
Status: offline

Well,

The weather was rainy and got windy, but I managed to get in the maiden float flight on Sunday. It was pretty uneventful and I got it back down without dunking it!

It was doing something rather strange in flight, if anyone has some input. When the power was reduced, the plane tried to dive, not a little nose down, but a hard vertical dive. It would also exhibit this tendancy with the slightest touch of down elevator. The plane, with floats, balances right at the aft end of the CG range, and did require some up trim for level flight.

Without floats, it flew fine and did not exhibit this tendancy (even when the cg was shifted an inch behind the range).

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_____________________________

In order to think "outside the box", one must first accept there IS a box.

(in reply to P-51B)