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Robbe › Not enough tail power?
03-30-2005 12:27 AM  13 years agoPost 1
Heli431

rrNovice

Hertfordshire, UK

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I'm setting up a used Eolo and am having problems with (apparently) not enough power in the tail rotor to counteract the torque from the main rotor. Running a brushless moter (not very powerful, head speed around 1700 max) with wooden blades.

As the rotor spools up the tail can barely hold the nose straight and as the heli lightens up on the skids it starts to pirouette. I immediately suspected the gyro, but after double checking the direction of the tail slide (and thus the pitch of the tail rotors) is correct for both rudder stick movement and gyro rotation, so I believe the gyro sense is correct. Full right stick at lift off will almost hold it straight, otherwise it starts a rapid counterclockwise pirouette.

I'm probably missing something obvious, but I'm struggling here!

Learning is fun, but can be very frustrating!

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03-30-2005 02:42 PM  13 years agoPost 2
jeff1

rrApprentice

Ottawa, Ontario, Canada

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Sounds like the tail rotor servo isn't properly centered. If the gyro direction is correct, you need to trim the tail servo mechanically to hold the heli steady while hovering.

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03-30-2005 04:10 PM  13 years agoPost 3
sheva

rrNovice

West Harrison, N.Y.

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SPINNING
Do you have the manual for the helicopter?

If so, look at the linkage diagram for the helicopter, see if you have a carbon copy of the setup with regards to the tail setup.

And a brushless motor should be plenty of power to at least hover the helicopter, unless of course your batteries are insufficent, or the motor is total the wrong wattage for the heli.

Robbe recommends a twist 37 w/kontronik 40-16-8 controller. This is a proven combo, and should work sufficiently to fly the helicopter w/o ripping it apart. Li-po's are great but 2400's can be used, as well as other battery combos, but be wary of weight since too much will just kill your run time, and overheat your motor due to the weight load.

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03-30-2005 05:28 PM  13 years agoPost 4
wink

rrNovice

Utrecht, Holland

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Hi,

Question... which gyro, tail servo and radio are you using?

It could be a combination of revo mixing with a HH gyro.... or in the mechanical setup.... when your tail servo arm is centered your tail rotor pitch glider should be centered as well.....

More info might be usefull....

Regards, vincent

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04-07-2005 11:32 AM  13 years agoPost 5
Heli431

rrNovice

Hertfordshire, UK

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Problem Solved
Thanks to everyone for the input. Problem was solved (thanks to Trevor at Midland!). Not enough headspeed! Effectively I had got the main pitch set too high, which was preventing the motor really spinning up to speed (and the throttle curve wasn't helping), which meant the tail rotor never got enough speed to generate enough force to counteract the rotor torque.

Changed throttle and pitch curves and got everything working just fine!

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