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HelicopterScale Model RC Helicopters › Fenestron troubles on dauphin
06-01-2004 04:04 AM  13 years agoPost 1
Airman98

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Southern Illinois

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I just finished painting my dauphin and have it back in the air but I am having a problem with the tail. For some reason as the rpm increases the tail will not get full deflection to the right. On the ground the center hub sticks out about 5/32 but at 1400 rpm it will only stick out about 1/8. I am using a 9252 on the tail with a 401.
Thanks for any help.
Tim

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06-01-2004 04:41 AM  13 years agoPost 2
Frequency47

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Port Ewen, NY

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Tail

I don't know Vario that well, but just incase I fell into $10,000 I have been reading up on the various models. One of the many problems with a fenestron tail rotor is speed. Call Vario and order the "speed-up" gear. I don't know the pinion count your looking for. I think the fenestrons have a smaller diameter and suface area, thus needing an increase in speed to create the same counter-tourqe thrust as a regular tail rotor.

CEO Sub-Terrainian Aircraft Development Corp.

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06-01-2004 07:19 AM  13 years agoPost 3
Moore

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California 93094-0940

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re: fenestron problems

READ THIS POST

http://wwww.runryder.com/helicopter/t69479p1

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06-01-2004 07:21 AM  13 years agoPost 4
Naomi

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Ontario, Canada

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Very informative..

Naomi

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06-01-2004 07:25 AM  13 years agoPost 5
Moore

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California 93094-0940

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thanks Naomi.

the link works now

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06-01-2004 01:51 PM  13 years agoPost 6
Airman98

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Southern Illinois

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What I dont understand is why at low rpm I get a lot of right deflection of the tail blades but at a higher rpm the blades will only deflect about half of what they do at low rpm.
Tim

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06-01-2004 07:35 PM  13 years agoPost 7
Dave Hollins

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UK

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You need a powerful servo on the Fenestron tail, you should be using something like a 9206...9Kg

The new carbon tail blades also make a lot of difference

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06-02-2004 01:50 AM  13 years agoPost 8
Airman98

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Southern Illinois

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Thanks for the input! Im going to try a really high torque servo and see what happens. I still think a 91 oz/in servo should be able to move the tail. It just seems like there is something that is binding as the rpm increases. I have held full right rudder from idle and as I increase the power you can see the pitch decreasing as the rpm increases.
Tim

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06-02-2004 03:04 AM  13 years agoPost 9
Frequency47

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Port Ewen, NY

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?

Did you double check your "Revo" mix?

CEO Sub-Terrainian Aircraft Development Corp.

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06-02-2004 10:48 AM  13 years agoPost 10
F.Pock

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Solingen west germany

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Hello

i have the new carbon blades on my EC135 with turbine. They worked better then the plastic blades. You becam more power on the fen. We fly the EC with 1280rpm on the rotorhead. We have still enough power on the tail. The servo is a Futaba 9206 and gyro is Futab GY240, no heading hold.

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06-02-2004 04:46 PM  13 years agoPost 11
Dave Hollins

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UK

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The carbon blades are much better, I flew the factory machines with these fitted...pretty good

I have not heard of any blades been thrown

The turbine EC is fixed at about 1280rpm by the turbine

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06-03-2004 11:22 AM  13 years agoPost 12
F.Pock

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Solingen west germany

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Hi Dave,

we fly with 1280rpm on haed, but you can change this with other gears or the rpm of the turbine, so it is not fix. But it is a good headspeed for scale flying.

Heli_Jack,

we fly with the plastic blades with the same rotor rpm, the EC was also fine to fly. But the carbon blades gives you a better feeling on the tail. I think this maschine costs more then 7500,-€, so the 65,-€ for carbon blades is not importent. When they worked only a little bit better, i will fly them.

greetings Frank

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06-06-2004 03:53 PM  13 years agoPost 13
Airman98

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Southern Illinois

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Just to let everyone know I installed a 9Kg servo and the tail is working fine. I can now turn the tail to the right, it is a relief to have it working. Thanks for all the help.
Tim

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