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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › rt640s on the metal 50 head
01-22-2010 09:24 PM  8 years agoPost 1
rotormonkey

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Ottawa, ON - Canada

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I think the feathering shaft on the LT head is a little beefier than the normal head isn't it? That being said, anybody foresee any problems running rt640s on the metal 50 head?

If it can't hover, it ain't worth flying.

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01-22-2010 11:15 PM  8 years agoPost 2
Frank Bostwick

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Cincinnati Ohio

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I wouldn't usually use this logic but anyway, They didn't make 640s to run on a 90 or even a 60/70 so by elimination they are made for a 50?
I say I wouldn't use logic like that because habit requires needing to KNOW, as in being stated or proven conclusively. I find in this hobby its cheaper that way

RIP ROMAN

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01-23-2010 01:29 AM  8 years agoPost 3
MAXHSHV

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I would say that depends on your flying style and headspeed.I don't think century planned on them being used with the LT head,however you stated you have a metal head, so the next question is what size of spindle do you have in your metal head?If it's the century 50 cnc upgrade head i beleive it's a 6mm spindle and i would say defenatley not.
On mine i built a hybred head useing the 50 nitro cnc center hub and the swift 620 se metal grips with it's 8mm spindle, and with this setup i think 640's will be fine. and as soon as they come back in stk I'll find out for sure

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01-23-2010 01:40 AM  8 years agoPost 4
rotormonkey

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Yeah, it's the Century metal upgrade head with the 6mm spindle. I do plan to crank the HS for 3ding. So that's a no then?

If it can't hover, it ain't worth flying.

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01-23-2010 02:20 AM  8 years agoPost 5
rccarguy

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Boston MA

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Yeah, it's the Century metal upgrade head with the 6mm spindle. I do plan to crank the HS for 3ding. So that's a no then?
The standard plastic LT head uses a 7mm spindle, I think you would be fine using the 640 MM blades on a 6 MM spindle, but if you want to be sure, do like MAXHSHV and build a hybrid with an 8 MM. Personally I don't see 1 MM making that big of a difference, but that's strictly my opinion and worth everything you paid for it

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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01-23-2010 02:43 AM  8 years agoPost 6
Gearhead

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well the 1mm wouldn't make a big difference, but it would be stronger, just enough stronger,,

do the mod !!

Jim
Buzz Buzz Buzz

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01-23-2010 02:51 AM  8 years agoPost 7
MAXHSHV

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I've bent 6mm spindles in flight on my ravens, and i'm not that good of a pilot, the 7mm looks huge compared to the 6mm and i believe would hold up fine to bigger blades but there's no metal head yet with that size , so my answer for now was the hybred 8mm metal head.I also wouldn't use the plastic grips with the 7mm setup for 640's , especailly if you're gonna rip on it.

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01-23-2010 03:40 AM  8 years agoPost 8
Gearhead

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a couple other things he could do,,

A) if he already has the 50 All Metal Head he could pop-out the 6mm Grip Bearings and pop-in the Radikal's 7mm Bearings and use the 7mm Radikal Spindle,,

B) just buy the 50 Metal Grips and change the Bearings/use the 7mm Radikal Spindle,,

C) buy the Swift All Metal Head with the 8mm Spindle,,

D) buy the Swift 8mm Spindle/Dampeners and buy 8x13mm Bearings,,

""I've bent 6mm spindles in flight on my ravens""

well Century was Outsourcing shafts at one time, hopefully that was the problem..

Jim
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01-23-2010 03:54 AM  8 years agoPost 9
MAXHSHV

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yeah i think it was weak shafts because i used some different 6mm shafts were fine, as for the 7mm spindle in the metal grips, i already investigated this a while back, it's a no go, the outer diameter of the bearings is different from plastic to metal grips.
However a set of swift 620 metal grips,along with it's 8mm spindle and dampers and spacers will have you my setup

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01-23-2010 04:51 AM  8 years agoPost 10
Gearhead

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MAXHSHV, thanks for clearing that up, I researched this once but it was a while ago,,

I just checked, so I see the Swift 620 Metal Grip Braring's OD are 14mm, I think the Glow 30/50 Metal Grips is 14mm also,, I have a set here but they are on the heli so it's hard to measure them..

Jim
Buzz Buzz Buzz

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01-23-2010 05:39 AM  8 years agoPost 11
MAXHSHV

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yes i beleive you are right on the od of both bearings.however you can't simpley switch the bearings because the 620 grips are shorter so the swift feather shaft will be to short for the nitro 50 grips.

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01-23-2010 06:10 AM  8 years agoPost 12
Gearhead

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""the 620 grips are shorter so the swift feather shaft will be to short for the nitro 50 grips""

I was wondering about that too back a while a go !!

Jim
Buzz Buzz Buzz

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01-23-2010 06:13 AM  8 years agoPost 13
Gearhead

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I guess I got to come-up with more money so I can have a Swift 620, NX 50 and the Radikal 20G so I know all the differences LOL

Jim
Buzz Buzz Buzz

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01-23-2010 06:17 AM  8 years agoPost 14
MAXHSHV

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thats right, thats how i know.one night i sat down took them all apart and just started swapping and trying.now i have a gripless 620, but i will have a set of new grips for it befor long, i may do up another setup like this for my nx 50 witch is getting my new rossi 57 this weekend.

Century heli rep. To much power is never enough.

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01-24-2010 12:36 AM  8 years agoPost 15
rotormonkey

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Ottawa, ON - Canada

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Well the deal is this:

I just bought Crash 'n' burn's Radikal. He was running the upgraded 50 metal head from Century. I too have one on my Raven now, and spare parts, so I'd like to just keep it if possible. He was running 620s though.

Now I have a set of rt610s, and a set of rt640s that I got with the deal. He kept the 620s for another heli.

That being said, I'd like to use the 640s if possible. I imagine they'll work better than 610s on this heli?

Not sure I follow why the bearings from the 620 won't work in the 50 grips. If the ID, and OD are right for the 7mm spindle, can't I just stuff em in? Yeah the grips are longer fine, but won't the bearings just be further inset then, and still work ok?

If it can't hover, it ain't worth flying.

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01-27-2010 10:01 PM  8 years agoPost 16
rotormonkey

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Sooo.. Any ideas on why the stock grips won't work, or whether this heli will fly well on 610s?

If it can't hover, it ain't worth flying.

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01-27-2010 10:19 PM  8 years agoPost 17
James Kovach

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canton, oh - US

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If you can fill the spindle up with bearings, spacers and head block, there is no reason you cannot do it. You are asking people to speculate on something they do not have laying on a bench infront of them.

Will it fly on 610s. Sure. How well, hard to tell. Depends on the blades and how well they load up the engine.

One thing about this hobby is that it is a "trail and error" kind of thing. You will never know until you try it. And if you assume anything, you will most likely be wrong. I'll put it this way, as long as it is done in a safe manner you can try anything you want :P.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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01-27-2010 10:37 PM  8 years agoPost 18
rotormonkey

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You are asking people to speculate on something they do not have laying on a bench infront of them
No I'm not. Maxhshv said he's tried it. I suppose on that point I was just hoping he'd elaborate a little on what stops it from working.

As for the 610s I imagine there's somebody out there who's tried flying the Radikal on 610s. The manual says it's designed for 600mm - 680mm as I recall.

If it can't hover, it ain't worth flying.

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01-27-2010 11:20 PM  8 years agoPost 19
oldfart

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Vancouver, Canada

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Rotormonkey.

Another Canuck.

I do not think you have much to lose by trying the metal CN2515 head you have for your Radikal with the 640mm blades. Even if you did bend the spindle, it would not be catastrophic.

But, for your information, there is a full metal head that uses a hefty 8mm spindle and also includes a 4mm flybar system, that will also fit the Radikal, and it is even made by Century.

It is my favorite rotor head for this size heli.

It is the one from their Carbon 620SE electric! You can buy it separately as the CN2516 (kit form) or the CN2516A (already built). If it can take the abuse of a 10S power system on the 620E, it will hardly be breathing hard on a Radikal with 640mm blades.

I have tested it on the Raven and on the NX50 where it proved to do very well.

Sometimes us Canadians must come to the rescue.

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01-28-2010 01:44 AM  8 years agoPost 20
MAXHSHV

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rotor monkey if i undersatnd your question correctley, you are asking why can't you take the stk 7mm spindle and it's bearings and simpley slide them into the metal grips that you have.if this is indeed the question you are asking .well i did some further research and for certain the swift 620 se grips use 8mm /14mm bearings, the radical uses 7mm/13 bearings,unable to get a bearing part number for the metal upgrade grips,I was told that it uses 14mm OD bearings, but from the clues in this listing http://www.heli-world.com/detail.aspx?ID=8753
it looks like it might use 13mm od bearings despite what i was told.
Since you have one of these heads why don't you pull one of the radial bearings out and give us the measurement so we will all know for sure.

as for the 610's they fly fine, it's just a matter of how much pop it has.for std sport flying they will be fine.I should ask what gear ratoi your running, because this will make adifference on your headspeed and what you can and can't get away with.If running 6.0 or 6.4 gears so you can spool it in the neiborhood of 2000 headspeed the 610's will do fine,On the other hand if you do run the 640's i would consider the 6.9 gearing at a must.

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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › rt640s on the metal 50 head
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