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Home✈️Aircraft🚁Helicoptere-Century Radikal E640 - Swift 16 NX › Alum. Head Block Question - SWIFT
07-20-2006 02:19 PM  14 years ago
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Stack

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Bethlehem, PA

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Alum. Head Block Question - SWIFT
Have a question for you all ...

Decided to try to install my alum head block last night. The standard feathering spindle will not work. The ball is too large to allow the spindle into the head block.

Is this the reason for the Reinforced Feathering spindle? CNE521A?

http://www.heli-world.com/detail.aspx?ID=8052

Also, what is the purpose of the ball on the stock feathering spindle and why is there no ball on the reinforced version if it is not specifially designed for the upgraded head?

Thanks in advance!
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07-20-2006 04:03 PM  14 years ago
Pistol Pete

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Seffner, FL

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To date it is still a mystery as to why the ball in the middle...but it sure was part of the problem for the vibs this heli had from its inception.

Insert spindle in a drill chuck and with a 120 grit sandpaper on other hand, sand away until it slides in smoothly..then sand one more time...then go fly!

Keep us posted...thanks.

Best of luck!
~~Enjoying the hobby one flight at a time~~
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07-20-2006 05:40 PM  14 years ago
stpeteheli

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St. Petersburg, FL

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Also, what is the purpose of the ball on the stock feathering spindle and why is there no ball on the reinforced version if it is not specifially designed for the upgraded head?
For what it's worth, From Century:

Symptom(s):
During spool up and spool down of the rotorhead, the helicopter exhibits a violent shake or vibration.

Reason(s):
During the manufacturing process, the tolerances of the plastic head block in comparison to the size of the machined ball on the feathering spindle were too closely matched. The size of the internal diameter in which the feathering spindle feeds through has decreased in diameter due to the natural absorbtion of moisture from freshly manufactured plastic parts. This "shrinking" of the internal diameter manifests itself during the first 30-60 days after a plastic injected part has come out of a mold. This results in tolerances too close to the size of the feathering shaft. The self centering floating feathering shaft system is defeated at lower head speeds, therefore causing a vibration during the spool up/down phase. When the head speed of the helicopter approaches higher head speeds, the optimum amount of centrifugal force allows the spindle to center itself allowing for smooth flight characteristics.

If the helicopter is placed on a hard surface (i.e. cement, tarmac), the tall and thin landing gear amplifies the shakes during the spool up/down phase.
Swift C550, Z30A-800 11T, CC45HV, 7s MaxAmp - 8s eMoli, DX7
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07-20-2006 06:03 PM  14 years ago
Stack

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Bethlehem, PA

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Thanks guys..

Pistol: It appears as if I will need to take a decent amount off of the ball to get it into the new head. I might give it a shot but I do have the reinforced spindle so will probably go that route.

StPete: Thanks a ton! I should have probably worded my Q differently. I was aware of the Century statement.. my question should have been: Since there is no ball on the reinforced version , and the alu head block was obviously not designed to fit the standard spindle, was the ball really necessary in the first place? Probably a rhetorical question! Guess it doesnt matter all that much.. I will go ahead and try the reinforced version and let you guys know how it goes.

Sticking with woodies on this attempt! Don't want to trash another set of rotortechs.
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07-20-2006 08:53 PM  14 years ago
stpeteheli

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St. Petersburg, FL

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Stack,

You asked the question right, I just thought Century explained the reason the the "ball" in their response about shakes. After re-reading their response I posted it is clear they really made no mention of the ball on the feathering shaft.

I think Pistol Pete had it right. Still a mystery about the ball and really nothing but problems with it

Niles
Swift C550, Z30A-800 11T, CC45HV, 7s MaxAmp - 8s eMoli, DX7
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07-20-2006 09:32 PM  14 years ago
Stack

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Bethlehem, PA

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I hear ya man... hopefully this reinforced ball-less shaft (that sounds odd) will work out well!

I'll keep you all posted.
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07-20-2006 10:59 PM  14 years ago
oldfart

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Vancouver, Canada

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The ball in the center of any such spindle is deigned so that the ball takes the straight vectored vertical collective loads and the dampers are left to only dampened the cyclic loads.

Theoretically that leaves less work for the dampers to do as they no longer have to support the weight of the Heli statically in the hover, and the extra loads through G maneuvers. So the dampers would last a lot longer.

But like in everything with helis, for every benefit there is costs. In this case in susceptibility to air and ground resonances.

Phil Noel
LEISURE-TECH Products
Canada's exclusive distributor for Century Products
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07-21-2006 01:34 AM  14 years ago
stpeteheli

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St. Petersburg, FL

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Thanks for clearing that up Phil

The ball in the center of any such spindle is deigned so that the ball takes the straight vectored vertical collective loads and the dampers are left to only dampened the cyclic loads.

Theoretically that leaves less work for the dampers to do as they no longer have to support the weight of the Heli statically in the hover, and the extra loads through G maneuvers. So the dampers would last a lot longer.

But like in everything with helis, for every benefit there is costs. In this case in susceptibility to air and ground resonances.

Phil Noel
LEISURE-TECH Products
Canada's exclusive distributor for Century Products
Swift C550, Z30A-800 11T, CC45HV, 7s MaxAmp - 8s eMoli, DX7
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07-22-2006 07:05 AM  14 years ago
rcmarty

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Penticton , B.C. CANADA

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So do i need the balless spindle for the cnc headblock ? I hope not , i've got the headblock but not the spindle

That headblock will look 10x better on the heli then it will on the bench

Martin
What goes up will come down.... one way or another !
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07-22-2006 12:46 PM  14 years ago
AV8TOR

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Fort Worth, TX

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So can you use the new reinforced version with the stock head and will it improve anything?
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07-22-2006 02:45 PM  14 years ago
TomC

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Gold Coast, Queensland, Australia

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I'm not sure, but I think that the ball in the spindle helps stablise the heli during hard collective moves, like flips. The Swift is the most stable heli I have ever flipped.

I have just ordered a new cnc head block and a new reinforced spindle. I understand that I'll have to sand the ball of the v2 spindle down quite a bit to make it fit. I'll try both spindles and report back any differences.

It's interesting to note that my MA Ion-x has a small silicon rubber tube in the middle of the spindle (optional, but recommended). This might help dampen collectives a bit and may be one reason that MA heli's fly so well!

Cheers,

Tom C
Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx
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07-22-2006 04:08 PM  14 years ago
Stack

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Bethlehem, PA

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RCMarty, as Tom mentioned, you will need to sand the ball down a pretty decent amount in order to get it into the head block. Otherwise, it's not going to fit.

AV8TOR: I know it will definitely fit. I tried it on a stock head block (but did not fly it!). Was simply curious.

I wish Century would provide a write up on their website when they introduce new-and-improved parts. It ends up being a guessing game as to what the intent is and if it will work with stock configurations.
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07-22-2006 05:32 PM  14 years ago
AV8TOR

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Fort Worth, TX

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I wish Century would provide a write up on their website when they introduce new-and-improved parts.
Yes definitely I could not agree more.
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07-23-2006 05:32 AM  14 years ago
Bill Ludwig

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Tucson, AZ

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Does anyone know what is 'reinforced' on the reinforced spindle?
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07-23-2006 12:44 PM  14 years ago
HugeOne

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Quebec, Canada

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Does anyone know what is 'reinforced' on the reinforced spindle?
The new spindle look like it's made of steel rather than aluminium.
Raptor e620 w/V-bar, Tango 45-06, Phoenix 85HV, TrueRC 12S1P 4000mAh
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07-23-2006 08:04 PM  14 years ago
SRH990

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Birmingham, UK

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As long as its not made from old Swift main shaftsSteve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
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07-24-2006 04:03 AM  14 years ago
Pistol Pete

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Seffner, FL

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lol...good one~~Enjoying the hobby one flight at a time~~
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07-25-2006 05:41 PM  14 years ago
craigoku

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Mountain View, Ca

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Feathering spindles
Yes, the alum ball is too big for the alum head block. I turned mine down in a drill press using a file. They went to a hardend steal one now that will fit.
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