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HelicopterScale Model RC Helicopters › century helicopter 500e
10-25-2015 03:51 PM  26 months agoPost 1
kenb

rrNovice

cloquet, minnesota carlton

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Has anyone converted a century helicopter from fly bar to flybarless using the original head and a microbeast? I have a vibration problem.

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10-26-2015 01:22 AM  26 months agoPost 2
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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yes only I haven't used the microbeast. I put a rate gyro on fore and aft and hit the skies.
I have two machines that have a two bladed flybarless head and both are from a century predator. I 86'd all the flybar pieces, made a swash driver and it was good to go.
if the blades are balanced properly but you still have vibration, then check the feathering shaft and main shaft. also check to make sure the blade grips have the same amount of spacers between the head's center yolk and the grips.

drive a rotary, fly a rotorcraft

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10-26-2015 03:58 PM  26 months agoPost 3
kenb

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cloquet, minnesota carlton

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The main and other shafts are new and the gap is the same on the rotor head, Blades balanced on a kohl balancer. Even tried a different head and blades. The fuel is foaming in the tank. The higher the rpm the worse the vib. Maybe I need a different clunk in the tank. I kinda think it's caused from the engine vibration. Ever experience anything like this?

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10-26-2015 05:00 PM  26 months agoPost 4
Grimracer

rrVeteran

Eau Claire WI

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Check the gap on the tail blades too.. I have run into this before.

Grim

Michael J Zaborowski

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11-03-2015 01:52 PM  25 months agoPost 5
kenb

rrNovice

cloquet, minnesota carlton

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problem solved, lowered head speed to 1400 and installed bubbleless clunk from hobbyking for $1.38. vibration was coming from the engine causing fuel foaming making the engine change rpms by itself.

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11-04-2015 02:02 AM  25 months agoPost 6
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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a header tank is another way to help that, the bubbles and foam wont occur in the header so the engine sucks solid fuel. the real fix is to balance your fan and clutch assembly but that's a pain in the butt since all that stuff has to be removed amd the process is painstaking

drive a rotary, fly a rotorcraft

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11-04-2015 04:14 PM  25 months agoPost 7
kenb

rrNovice

cloquet, minnesota carlton

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I think that you are right. I did all that and had the same problem. Everything balanced out. Something different about this engine os 50sx. I set the stick and carb at 50%, just like my other century heli's and the engine is screaming at mid stick. Gear ratios are the same. I reajusted the throttle curve in the radio to much less than 50% and cured the problem. It now turns at about 1400, about 1700 before and I think maybe I can adjust it to about 1200 now. Flew it yesterday and it flew fine at 1400. I have a century hughs 300 with an os 46 which turns at about 1200
and it's easier to handle. Do you know what rotor rpm your scale heli's run at? Your flying like it's on rails impresses me. My flying isn't anywhere near as smooth and I'm trying to blame the helicoper, but I'm afraid it's me!

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11-05-2015 11:50 AM  25 months agoPost 8
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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Ok great. yeah some setups do crazy things at higher rpmand behave nicely when the rpm is lowered.
I don't really know for the most part what my headspeeds are, I set things up by ear. I never liked a screaming headspeed especially on a scale machine because most of the time it doesn't look right and it also scares the crap outta me
I usually set it as low as I can get away with
thanks for the comps, set up amd practice will get you a smooth flying machine most every time.
and btw, thanks for that thing in the mail

drive a rotary, fly a rotorcraft

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