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Century Radikal E640 - Swift 16 NX
› Can't get my heli off the ground
05-01-2004 08:10 PM  13 years agoPost 1
R0dney21

rrNovice

Sacramento, CA

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I installed a set of Like90 blades, with the Johnson motor, at first I had a problem with the blades closing in on themselves, but I just tightened them down real well and they don't do that anymore, but now with a fully charged battery at full throttle the heli won't come off the ground. I just have the birdseed packs, are they going bad, do I need to go to LiPo, or is there something else I need to check?

Thanks.

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05-01-2004 09:08 PM  13 years agoPost 2
Bluesilver30

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USAF Academy, CO - USA

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you shouldn't tighten the blades all the way. it's good to leave some movement in them for drag on the blades. you may need a higher voltage battery. i suggest the etech 1200 3c lipo batteries.

also make sure the pinion isnt slipping off the motor and that the pinion teeth mesh correctly wiht the main gear teeth. the mesh shouldn't be completely tight, but it shouldnt be so lose that the pinion missed the gear sometimes. try to find the ideal spot.

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05-01-2004 10:22 PM  13 years agoPost 3
Yukonho

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Montreal, Quebec, Canada

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As bluesilver said.
I am surprised you cant get off the ground with that setup. Pinion mesh is very important. Also, what pinion are you using?
Is there any noticeable vibration? ar the blades tracking well? are your batteries fully charged?
This setup is well proven, so there must be something wrong somewhere. Also, add a drop of 3 in 1 oil to each bushing in the johnson motor.
Let me know how this goes.
colin

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05-02-2004 01:01 AM  13 years agoPost 4
R0dney21

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Sacramento, CA

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I am using the pinion that came on the motor with the Like90 upgrade kit, it is meshed well with the main gear. I don't know how to tell if it is too tightly meshed, but it definitely isn't loose. I really tightened the blades down, because when they were able to move, once I started getting the throttle higher I was getting a horrible squeaking sound, after slowing back down I could see the blades had rotated in on themselves. To add the oil to the motor bushings, do I have to take the case off? My batteries are fully charged and were working with the stock setup, I never really had good lift, but I could hover 8ft up or so. I think I may have to adjust my gyro too, because now when it starts to get light I am having to apply full left stick to keep the heli from rotating clockwise.

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05-02-2004 02:07 AM  13 years agoPost 5
Yukonho

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Montreal, Quebec, Canada

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The screeching sound is probably coming from the motor. There have been a few reports of this recently. A drop of 3 in 1 (do not use WD-40 it is not a lubricant) on each bushing will fix you right up.
Just put a drop on each bushing from the outside. Do not open the motor.
Do not run the blades super tight. Make them tight enough so that you can still move them with your hand. Tight enough so they wont move when you gently shake the heli, but no tighter than that. The blades will move to where they need to be.
The gear mesh should not be tight. There should be a small gap between the main and the pinion. Not enough to skip, but make sure there is some space there.
Take the time and read the manual and adjust the gyro and mixer. It is essential.
colin

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05-02-2004 04:20 AM  13 years agoPost 6
R0dney21

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Sacramento, CA

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I tried what was suggested, I loosened the blades back up a bit, added a couple of drops of oil to the bushings, and adjusted the motor position for better meshing. I did notice that after that it spun by hand easier. This seemed to take care of my screaching sound, but I still don't get off the ground. I left the johnson motor on it and put the stock blades back and it took off again then. I don't know the life expectancy of a birdseed pack, but maybe it's just not holding enough charge anymore.

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05-02-2004 10:16 PM  13 years agoPost 7
bobbdd

rrNovice

Gardner MA.

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Gyro set-up

Almost any change you make to the power set-up could cause you to need a gyro ajustment.Also I went to like90 blades, and they want to go fast,try an 11 tooth pinion. I don't have ant expeareance with the Birdseed,but it would not hurt to make your next beta a 1500 2cell LI-PO

bobbdd

My HB is $500.00 worth of aggrivation, I love it !

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05-02-2004 10:36 PM  13 years agoPost 8
Yukonho

rrApprentice

Montreal, Quebec, Canada

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We have done some testing on gear ratios. 10:1 seems to be the way to go with 2 cell LiPo's and the Johnson motor. That means using an 11 tooth pinion on the hummingbird and 9 or 10 tooth on the Aerohawk. Unfortunately 11 tooth pinions are very difficult to find. We are having a whole bunch custom made for us and will offer the choice of pinions (based on your heli) as soon as we get them in.
With the birdseed, an 11 tooth should be the ticket to get you flying. Many have flown like90 blades with birdseed and 10 tooth pinion on the Johnson with no problems, so I suspect your batteries may be on the way out.
co

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05-02-2004 11:58 PM  13 years agoPost 9
R0dney21

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Sacramento, CA

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Well LiPo is on the cards for as soon as I can spare some cash. I am expecting that is my problem, I already had one birdseed pack die out on me. Thanks for the help.

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Helicopter
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Century Radikal E640 - Swift 16 NX
› Can't get my heli off the ground
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