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Need a RTF with good lifting capability

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Need a RTF with good lifting capability

Old 11-29-2011, 06:17 PM
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Default Need a RTF with good lifting capability

Hello all! Thanks in advance for any help here!

I have zero RC helicopter experience, but I am a professional pilot with a bit of a nack for flying things (but I know that this will be way different!). I'm trying to decide on a good ready-to-fly helicopter for personal use. Here are the requirements I need to meet:
- **Good lifting ability with minimum modifications** (lifting is the most important aspect)
- Able to keep a hover in a light breeze
- No requirement for loops, flips, or any other 3D
- Range / endurance are "plusses"
- Not concerned with how it looks, as long as it gets the job done
- Prefer a machine that develops skills that will transfer to more dynamic helicopters
- Cost range: under $500, perferably under $200

Thanks!<br type="_moz" />
Old 11-30-2011, 08:26 AM
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Default RE: Need a RTF with good lifting capability

Your cost range would barely cover a stabilzation unit let alone the rest of the helicopter. How much weight?
Old 12-01-2011, 04:14 PM
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Default RE: Need a RTF with good lifting capability

Weight equal to, lets say, a six pack of your favorite beverage.

Also, why do RC Helicopters use a gear between the motor and the main rotor? Why not just attach the rotor directly to the motor?
Old 12-01-2011, 04:22 PM
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Default RE: Need a RTF with good lifting capability


ORIGINAL: 30mmRocksYourWorld

Weight equal to, lets say, a six pack of your favorite beverage.

Also, why do RC Helicopters use a gear between the motor and the main rotor? Why not just attach the rotor directly to the motor?
The same reason all real helicopters do.

Rotor speed has to be correct for the blades will be in a constant state of cavitation, high speed stall, etc...etc..
Old 12-01-2011, 05:17 PM
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Default RE: Need a RTF with good lifting capability


ORIGINAL: Desertlakesflying

The same reason all real helicopters do.

Rotor speed has to be correct for the blades will be in a constant state of cavitation, high speed stall, etc...etc..
Interesting, and a new concept for this fixed wing guy! How does one determine the correct, or more importantly, maximum rotor speed? Is it determined by the shape / size of the rotor blades?
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Old 12-01-2011, 08:31 PM
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Default RE: Need a RTF with good lifting capability

Here's a quick reality check, and I applogize in advance if it comes off as harsh.

You'd need to add a 0 to your budget to begin to think about lifting that much weight.

As for the gearing, most helicopters run between 1500 and 2500 rpm on the head or so.

A typical motor for a 3S battery powered Trex 450 is in the range of 4400kva (rpm per volt) so throw 12 volts at 4400rpm per volt and you get a motor rpm of.....??

52k ish. You need to gear that down to get your 2500 or so rpm.
Old 12-02-2011, 03:40 AM
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Default RE: Need a RTF with good lifting capability

Not harsh at all, I appreciate the candor and your willingness to provide me info!

I know that this is a sweeping generalization, but are quadcopters able to lift more? Let's assume an electric helicopter with the same disk size as the "wingspan" of the quadcopter, and the same brushless motor, and both were of average weight for their design requirements. Seems like 4 motors would be better than one.. or two, but I don't know if they truly produce more lift. Anyone know?
Old 12-02-2011, 09:53 AM
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Default RE: Need a RTF with good lifting capability

The quad can lift more and is definately more stable. The quad is also the best for video work.
Old 12-02-2011, 01:37 PM
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Default RE: Need a RTF with good lifting capability

i think the biggest issue we're (at least I am,) having answering your original question, is the the fact we're not quite sure what you're going to be using it for.  although you said it would be for "personal use," i don't think you specified why.  if its a rig which is gonna shoot video or pics, first, its gonna cost a [bleep!] load of money and 2, when you crash (everyone does, don't ask me how i know [8D]) there's gonna be a rather large bill to get it flying again.  for video, i would actually go for a slow flying motorized sailplane[is that an oxymoron or what?]. 
speaking on behalf of everyone, I think we would all be able to help you better if you could specify  what, where, when and why you want to be flying a heli with a 6-pack strapped to the bottom of it, so we might be able to better advise you. 
Old 12-02-2011, 05:42 PM
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Default RE: Need a RTF with good lifting capability

LarryV - Thanks!

As for my intentions for lifting stuff.. truly, I want to make a rig that will drop water balloons. I may build a camera rig sometime down the road though. Seems cool. <br type="_moz" />
Old 12-02-2011, 08:47 PM
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Default RE: Need a RTF with good lifting capability

30MM
Check out this video for Quad lifting. If you like the quad and are willing to build it yourself I think you could probably do it for 300.00 to 350.00, cheaper if you get your motors and ESCs from Hobby King
http://www.youtube.com/watch?v=EeQDA...eature=related
Old 12-03-2011, 07:59 AM
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Default RE: Need a RTF with good lifting capability

Thanks LarryV! I think I know which way I'm going to go. Quad-copter it is!

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