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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsRobird › pitch problem
01-12-2015 03:13 AM  3 years agoPost 21
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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do you have an extra RX to try or bybass robird and check the movement on the bench.

usually the binding only occurs when spooled up

spending time, paying attention

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01-12-2015 04:45 AM  3 years agoPost 22
eyefly3d

rrApprentice

magnolia tx

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Well I pulled the head apart and found both thrust bearings were seized. I used a grease that came with another kit on them when I built the heli and it somehow turned into glue, they were both stuck, almost like it was locktite. In the process of trying to free them I lost one of the balls and can't find it so I'm going to have to order new ones. The dampeners also don't seem like they are in the head all the way but I cant push them in any further. That is causing the grips to be too tight when the bolts are tightened into the feathering shaft against the shoulder. I'm going to have to figure this out because I can't just back the bolts off without fear of them coming out in flight. Any suggestions? This is not my first kit and I consider myself pretty good at building these things but I'm kinda at a loss with this swift.

Chris

I don't always fly helis, but when I do I prefer to fly scale.

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01-12-2015 05:04 AM  3 years agoPost 23
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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for the dampers I used a bolt and washers to get them seated and compressed. be sure to use a lot of lubricant on the spindle.
or put in vise between 2 blocks of wood to squish em in.
you can use Vaseline or triflow for the thrust bearings

common problem for Century Heads.

spending time, paying attention

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01-12-2015 05:08 AM  3 years agoPost 24
eyefly3d

rrApprentice

magnolia tx

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I'll give that a try. The last century I built was a Hawk .30 probably 10 years ago, my first heli. Flew that thing everyday for years before moving to .50's

Chris

I don't always fly helis, but when I do I prefer to fly scale.

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01-12-2015 05:11 AM  3 years agoPost 25
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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basically same as hawk pro and raven heads they were a Btch to get working smoothly.

have patience and work in the dampers

spending time, paying attention

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01-12-2015 05:25 AM  3 years agoPost 26
eyefly3d

rrApprentice

magnolia tx

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Will do, thanks for your help.

Chris

I don't always fly helis, but when I do I prefer to fly scale.

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01-12-2015 01:06 PM  3 years agoPost 27
goodhunting

rrVeteran

Slovenia ... somewhere in Europe

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well I'm not familiar with your FBL unit but you are using 3D setup to fly scale...

Usually in the 3D world you would set up your Pitch curves so that at mid stick you would have 0 deg and then you would have equal travel in both positive and negative. You need this for 3D maneouvers...

but for scale you set up your pitch differently...

at mid stick you set 5,5 degrees... as the helicopter hovers at this pitch range. Then at low stick you set -3 deg and at high stick set +12 deg...
this will enable you to hover at mid stick... descend when needed (the scale fuse will add weight to your helicopter and it will fall from the sky at this setup... and the positive will give you just enough pitch to get you out of trouble when and if you get to that point.

I don't know how to set up your FBL unit... I use the Sk720 and Vbar. They are both different in the ways you set it up but it the pitch ranges are the same in both. This works on my 500 size seahawk and on my 600 size mechanics set for Apache. I can't fly 3D so all my birds are set up this way from my 600's (bound for scale fuselages) to my Trex 700... awaiting proper project to emerge...

gh

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01-12-2015 03:35 PM  3 years agoPost 28
eyefly3d

rrApprentice

magnolia tx

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Thanks for your input GH. I do set my scale pitch curves the way you suggest but I set them up on the 3d curve to start with then adjust them once I'm confident in the heli. I know it seems odd but I like to fly the heli thru it's entire capabilities before I put the mechanics in the fuse just so I know what it's capable of. To me it was also easier to set the fbl unit up this way and is easy to adjust the curve in the radio for scale flight. I think the issue is the thrust bearings not the robird, just have to get another set here to try again.

Chris

I don't always fly helis, but when I do I prefer to fly scale.

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01-15-2015 01:38 AM  3 years agoPost 29
eyefly3d

rrApprentice

magnolia tx

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The head was the problem. New thrust bearings and some work on the dampeners and it flies perfect. Thanks all who helped.

Chris

I don't always fly helis, but when I do I prefer to fly scale.

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01-15-2015 03:30 AM  3 years agoPost 30
don s

rrElite Veteran

Chesapeake, VA

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Happy ending, very good.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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01-15-2015 05:13 AM  3 years agoPost 31
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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spending time, paying attention

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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsRobird › pitch problem
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