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Beginners - Helis A forum where beginners can get help on the fundamentals for experts who know their stuff!

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Old 12-26-2011, 11:39 PM   #1
Mikee
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Default Crab Walking

Hi All,

I'm new to your site and appreciate all your help.

Just received a Blade 450 3D RTF and have been trying to just hover it in my basement. My problem is that it always "Crab Walks" to the left before I actually get it of the ground. Is this normal? I've tried to pitch it to the opposite direction but I'm afraid that I'll drive the main blades into the ground on lift off.

Thanks for your help
Mike
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Old 12-27-2011, 12:22 AM   #2
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Welcome to Wattflyer Mikee. Someone more heli experinced should check in here, too, but I'll throw in my 2 cents. I have limited RC heli experience (a couple of cx rotors and an MSR) but lots of sim time and book-smarts. It sounds like the normal effect of the tailrotor. It's not only counteracting the torque from the main rotor, but it is a propeller pushing to the left. So it's another one of the multitudes of forces acting on a heli.

I read somewhere it's actually acommon term among full scale heli pilots, when asked 'how ya' doin?', to respond 'left skid low', meaning all's normal, since their tail rotor is pushing them to the right, so they need a little left cyclic to counteract it in hover, and hence the left skid low attitude.

I even experience this with my little MSR.

Happy flying! (And be carefull in that basement. Any heli bigger than the micros make me nervous!)
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Old 12-31-2011, 03:45 PM   #3
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Most helis will kick left on takeoff as said above. If this is your first 3d heli I strongly advise you to get it checked out by someone experienced. That way you will know it has been set up correctly and any funny flying is probably something your'e doing. You will need to set up your swash so it is level at neutral, set your blade pitch so you have the required pitch to suit your flying (I personally like to hover at mid stick but we're all different) set up your throttle and pitch curves in both normal and idle up configuration, set your giro to head lock and adjust the gain till it's right, set up your swash type and mix on your radio etc If the heli is not set up right an experienced flyer will have trouble and an inexperienced flyer will crash.

3d helis are generally very powerful and thus very dangerous in the wrong hands. If you are new to 3d helis and have an experienced friend, seek their help. It will save you a fortune, maybe an injury and help you to learn quicker.
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