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Lite Machines › Corona Problems - Not enough power?
05-06-2005 03:41 PM  12 years agoPost 1
StarBLaSt

rrNovice

Austin, Texas

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I'm a first time heli builder and I bought a kit from helihobby.com. It came with a brushed Magnet Mayhem kyosho motor instead of the stock one, because they said they didnt have the stock in stock.

Number one, that motor runs the wrong way, so I put the leads of the ESC on backwards so it will turn the right direction.

I'm using an 8cell Sanyo 2600mAH battery that's pretty heavy, with the JR landing gear.

And the damn thing wont lift off. On the site it recommends using a 12T pinion for 8 cells, and I'm using a 9T.

Could that be the problem?

And is it dangerous to run a motor with the leads reversed?

Thanks!

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05-06-2005 04:07 PM  12 years agoPost 2
RandyT

rrNovice

Los Angeles, CA

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It's not dangerous to run the motor in reverse. It needs to be that way with the Corona. It's odd that there is not enough lift..I thought the Mayhem had less turns then the Atomic Force so should be faster. The main rotor rotates in a counterclockwise direction. Are the endpoints for your throttle correct~? You might need the 12T pinion, but I'm not sure never using that motor. Sorry can't be more help. Good luck.

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05-06-2005 05:07 PM  12 years agoPost 3
StarBLaSt

rrNovice

Austin, Texas

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I maxed out the endpoints on the throttle, so I dont think thats it.

Any other ideas? Keep in mind that I might be overlooking something really simple, since this is seriously my first experience with R/C anything AND I'm doing it completely by myself.

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05-06-2005 08:45 PM  12 years agoPost 4
flyingmisher

rrNovice

Franklin, Wisconsin

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No power problem
I am also new with Heli's, and had the same problem with my brushless system.
I had to re-program the speed control to fixed pitch in the throttle setup. This solved my problem. Now all I need to do is learn how to fly it.

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05-06-2005 10:41 PM  12 years agoPost 5
RandyT

rrNovice

Los Angeles, CA

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Does the motor get warm when you spin it up~? Sometimes you have to check the brushes..they might get hung up or seated incorrectly. You might also want to break in the motor and properly seat the brushes. Good luck.

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05-07-2005 03:57 AM  12 years agoPost 6
KnimRod

rrApprentice

Central Michigan

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The Magnetic Mayhem is a 22 turn motor. That's a far cry from the stock 13 turn motor and IMHO, will probably not work too well with a 9 tooth pinion. Personally, I think you'll be much happier with a 14T-15T double wind motor.

Also, just hooking the motor power leads backwards may cause a timing problem. I think those motors come with some advance already adjusted in. This means that the timing will be retarded if you just hook up the power backwards. You may also need to adjust the timing.

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05-07-2005 02:51 PM  12 years agoPost 7
imsofaman

rrApprentice

Northern NJ

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I use the magnetic mayhem REVERSED timing in one of my Lazy Bees with a gear box. Not sure what rotation is needed for the Corona. The Magnet Mahem was created for the Monster trucks like the USA one and the Clod Buster. Awesome motors with good power...just not high RPMs.

You may want to remove your blades, check your rpms at full throttle. Switch your neg. and pos. lead to the motor and check rpms again. Which ever way has the higher rpms will determine if you need the reverse timing or the standard timing.

Another option is to purchase a brushed motor that offers timing adjustments on the can.

Hope this helps.....

Viva Juan De La Cierva!

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05-07-2005 03:05 PM  12 years agoPost 8
StarBLaSt

rrNovice

Austin, Texas

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Thanks for all the input, guys. I put a 14 tooth pinion on there and it started flying! Then I realized my ikari profi gyro was mounted in the wrong orientation. Then i realized that my TR gears were slipping so I was losing rpms at the tail rotor.

But i fixed all those problems and I took my first flight! HOLY CRAP!

This is the best hobby in the universe. All that awesome hard work in the simulator paid off. The corona handles better than I ever expected, especially since I built it myself.

I tipped over a couple of times, and at one point i had a pretty hard landing and the battery fell out a few seconds after I was back in the air.
Imagine me trying to do corrective movements while it fell through the sky with no battery.

After a few charges the worst damage i had was a dented tail boom and a missing half of a battery clip.

I also decided that most of the damage could have been avoided with some training gear. So I'm going to improvise some today.

Pictures to follow!

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05-07-2005 03:40 PM  12 years agoPost 9
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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Way to go mate! Assuming you are using a 7 cell pack, I'd look at going to a brushless mega 16/15/4 with your 14t pinion. You will get 30-50% longer runtimes. Also, you might want to use both 4 deg grips (4spots) to improve the tail response. Good luck and happy corona flying!

Cheers,

TomC

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