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04-27-2004 10:35 PM  13 years agoPost 1
sworrixrrNovice - columbus ohio.... - My Posts: All  Forum  Topic
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04-27-2004 10:36 PM  13 years agoPost 2
chopperscott

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oak ridge, tn

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Yes!

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04-27-2004 10:37 PM  13 years agoPost 3
ReadyHeli

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Jupiter, FL

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are people actually having good luck with these motors?

Staff @ Readyheli

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04-28-2004 03:49 AM  13 years agoPost 4
RickyT

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San Jose, California

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My 1st J250 motor has ~60hrs flight time and it's still going strong. 2nd motor has ~10hrs flight time so far.
Regards

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04-28-2004 06:06 AM  13 years agoPost 5
zoom

rrElite Veteran

Galveston, Texas

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can that johnson handle 3s 11.1v 1200 lipos?

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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04-28-2004 06:24 AM  13 years agoPost 6
chopperscott

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oak ridge, tn

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OK, here's a question. With my card Cobra canopy, I can't get over a foot off the ground with the Johnson motor. I'm running etec 1200 2s lipo's & the Mia G10 frame. Should the motor be able to handle this or am I expecting too much? Haven't weighed the fuse but it's really light, though I guess it could be a problem. Would a 3-cell lipo help any? Come on guys, I need help!

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04-28-2004 05:11 PM  13 years agoPost 7
zoom

rrElite Veteran

Galveston, Texas

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Man, that looks like one heavy bird

I have had success with my 400 motor and 2s 700 mah e-tec, but when I added that extra 11 grams from the EDP 50 tail motor, that 2s 700 lipo was only able to lift my heli 1-2ft off of the ground. You be surprised just how much a few extra grams can affect your micro heli. Hummer's canopy alone weighs: 7grams. And surely that body on your heli weighs alot more. What feels light in your hands is a totally different story when it comes to your heli's ability to lift it. But that's the fun thing about electrics, you get to experiment a lot more, and everything seems to be trial and error. But when you experience success, oh it is so sweet.

Check the vids in my gallery. I got footage of my 280 stock motor struggling then burning out, only to replace it with a speed 400, which looks at everything as if it is a breeze. I bet that groupner speed 400 motor will lift it. It was only $10 at the local Hobby store. I only caution you that it shaft is 2.3mm and it was hell drilling a larger hole into the pinion that came with a standard 2.0mm hole. My bird's flying weight is 316 grams, and there is still some reserve judging from its climbout ability. Another thing you can do is go with a slightly lighter 3s lipo, but be sure that the current capacity can handle you current setup.

Towerhobbies.com is selling a new line of Electricfly lipos that are supposedly rated at a slghtly higher current rating than the e-tec's, and they also include charge-protection chips on them. I don't how good they will be. We all will have to wait to see how well they work. If this is true, you likely be able to go with a lighter battery with a decent current capacity. This will likely solve your problem. Unfortunately, these lipos are not available until late June, that is why I am going to try my luck with 3s 830s from Thunder power.

Another good tool to have is a decent digital scale that will do up to 4-5lbs and can switch to tell you grams, especially when dealing with this electric arena because everything is so weight-dependent. I don't know your financial status, but I was able to find one in Bed Bath and Beyond store for $30. Also try to locate a voltmeter. Radioshack has them for $15.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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04-28-2004 05:37 PM  13 years agoPost 8
clovis

rrNovice

Montreal

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Chopperscott, this is a very nice fuselage. May I ask you were you get it from. It really look very good.

Thanks,
Clovis

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04-28-2004 05:59 PM  13 years agoPost 9
JohnM

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Providence, RI - USA

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Yes, please tell. Did it come pre-painted or did you paint yourself. It looks fantastic.

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04-29-2004 01:12 PM  13 years agoPost 10
chopperscott

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oak ridge, tn

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It's the "card" Cobra canopy from here http://www.modeltek.com/
It's not painted, it's printed out on a color printer. I've actually considered selling them already made but I've no idea about the issues of selling them since I had to pay for the files from modeltek, & don't want to step on any toes. We'll see...............................

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04-29-2004 05:16 PM  13 years agoPost 11
JohnM

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Providence, RI - USA

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I checked out the site but it looks like the file will just print out an all grey body. Did you modify the files by adding the colors before you printed them out?

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04-30-2004 01:06 AM  13 years agoPost 12
chopperscott

rrApprentice

oak ridge, tn

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These colors come on the pages of the PDF file. Some adjustment of the color properties of the printer were necessary, although it still came out pretty dark. I've read of others modifying the colors with Adobe photoshop or similar programs.

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04-30-2004 06:07 PM  13 years agoPost 13
JohnM

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Providence, RI - USA

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Great, I just sent them a paypal payment. Please email me at jgmarsh@attglobal.net if you are interested in selling a pre-built one.


Getting back on topic, I don't think the motor will last too long on a 3S pack. I read somewhere that an 11 tooth pinion with a 2S pack is a good combo.

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04-30-2004 06:57 PM  13 years agoPost 14
zoom

rrElite Veteran

Galveston, Texas

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The motors are cheap enough to keep replacing until you get the brushless setup. Generally, if you go up on pinion size, you increase the amount of workload on an engine much like the way that you shift to the larger crank size on a bicycle. It has the potential to produce more speed if there is sufficient amount of torque (person's abilility to peddle harder in this bicycle example) available to do the job.

Unfortunately, in the case of electric motors, the torque curve is flat and adding an increased workload may result in sub-optimal overall performance, not mention, more heat produced at the battery and motor the due to the new demand for torque when increasing the pinion size. Also there may be less run times and possibility of killing your motor, so proceed with caution, and be sure to monitor temps whenever you start changing gear ratios.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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