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HomeAircraftHelicopterHIROBOOther › EVO spindle keeps bending in flight
11-05-2004 11:03 PM  13 years agoPost 101
blakka_1

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London/Enfield

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some guys have bent the quick uk spindle as well. read back a couple posts I3DM and you'll see.

Its said that the quick uk spindles still bend but bend only slightly, they are said to be stronger than the stock spindles.

anyhow i do think the quick uk spindles are the way forward, until a spindle thats even harder & stronger comes out.

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11-06-2004 01:01 AM  13 years agoPost 102
NewHeli

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Pittsburgh, Pennsylvania, USA

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Anyone tried a Century yet? I HEARD (I'm not saying this myself) from an "amature machinist" that Century has higher quality machining than thunder tiger...Not all beat me down on this one, someone else said it...

NewHeli

Nathaniel Rice
Team YS Engines

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11-06-2004 06:31 AM  13 years agoPost 103
TMoore

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Cookeville, TN

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A feathering spindle doesn't really represent a quantum challenge in machining the way that the plastic tooling does or the way that full size parts on a real heli would. We aren't talking about multi axis machining to create parts here. It is just a matter of getting the right tensile strength and material spec.

TM

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11-06-2004 07:15 AM  13 years agoPost 104
Scotty

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Calgary, Canada

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Hi Guys ....My 2 cents
I have an evo 50 with the hyper50 and mp2 quite combo. I also installed the cx dampners and the heli had a continuous bobble at anything less than about 1850 on the head. What I found was the cx dampers extend beond the head block and preload the thrust bearings. What I did was shave the cx dampers flush with the head block. I did this by installing the dampers in the head block and then after I was sure the were fully seated I used a very sharp blade to trim the damper flush with the head block. After putting it back together, I flew it and the head bobbles are gone..Fantastic cyclic response. I also did the ccpm conversion with jr8311's , rotortech 600's and 2000 on the head speed and it is a wickedly smooth heli with wild 3d performance. I have yet to bend a spindle and I has survived some pretty wild screw-ups! and of course everthing I have been able to throw at it..... Hope this helps.
Regaurds
Scott

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11-06-2004 12:08 PM  13 years agoPost 105
blakka_1

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London/Enfield

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Anyone tried a Century yet? I HEARD (I'm not saying this myself) from an "amature machinist" that Century has higher quality machining than thunder tiger...Not all beat me down on this one, someone else said it...
whats thunder tiger machining got to do with this topic on evo spindles?

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11-06-2004 02:55 PM  13 years agoPost 106
NewHeli

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Pittsburgh, Pennsylvania, USA

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The person that was comparing Century to TT brought that up in a Century vs raptor question...assuming that TT is a good brand, and "Century is better", would that give a hint? I realize that a spindle is not very complex.

Did anyone else do what Scotty did? Sounds like a good fix

NewHeli

Nathaniel Rice
Team YS Engines

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11-08-2004 12:31 AM  13 years agoPost 107
Sceadu Abuser

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England, Leicestershire

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Did anyone else do what Scotty did? Sounds like a good fix
I have already put a post on this subject and I definately agree with scotty. I have used ccpm on sceadu's now for over two years with 3 X 8231, SAB 600 a 4mm flybar conversion, with a west 50 @ 2000 on the head (this is a very very agile combination).
I do use cx dampers but didnt have a problem with them fitting.
I have this set up on 2 machines and still trying very hard to bend feathering spindles. Another member at our club bought a sceadu a few months after mine and built it without ccpm. This machine soon developed the blade flutter. To cut a long story short after lots of trial and error trying to sort this machine out he ended up fitting ccpm. it seems that on the sceadu there is a problem with either the servo tray or control system flexing and/or both (if you have ever seen the swashpate when the blades are fluttering you will understand what i mean) The only reason I can think why I have never had a problem with bending feathering spindles (or blade flutter) is that I uses ccpm. There are also 2 other sceadu's at our club now. One has ccpm the other doesn't. Guess which one has the problems.

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11-08-2004 01:15 AM  13 years agoPost 108
NewHeli

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Pittsburgh, Pennsylvania, USA

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Wow, thats weird. Does that mean I'll have to buy the ccpm conversion kit when I get an EVO? How does a different control system to the swashplate, not in the head, affect if you bend spindles?

NewHeli

Nathaniel Rice
Team YS Engines

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11-08-2004 01:55 AM  13 years agoPost 109
Sceadu Abuser

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England, Leicestershire

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How does a different control system to the swashplate, not in the head, affect if you bend spindles?
Ok the members machine who had a blade fluter asked for help. We
started of by stripping the head down to check every thing was ok and refitted. This didnt sort the problem out. I flew the machine with the canopy off and made it flutter, the blades looked like they were out of track by about 2 inches and the swash plate was moving up and down in a blur. We tried many things inc reinforcing pitch servos swapping my head for his. The only thing that appeard to help was to flip the blade grips so that they were leading. His machine wasnt flown hard though at that time. I needed a second machine this year for the masters, at the time I couldnt get hold of a ccpm evo so I tried the machanical version. I flew it for about a month or so and bent a few feathering spindles. I pushed it too hard one day and it boomstruck destroying it. I later bought another and was then able to get a ccpm version. This is now exacty the same as my original and still flying on the same stock spindle. It seems the ccpm version has a lot stronger hold of the swash plate, not alowing it to flutter no matter how hard you push it, and so not bending spindles.

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11-08-2004 02:42 AM  13 years agoPost 110
TMoore

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Cookeville, TN

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SA,

This is a good point. I had a Rap 50 V1 that had a case of the woofs too. I cured it by going to a metal collective arm. I won't use anything else on the Raptors.

Slop in the collective will do it every time.

TM

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11-08-2004 10:09 AM  13 years agoPost 111
dtang

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Massachusetts

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Does anyone make a stiffer collective arm/lever for the evo?

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11-08-2004 01:25 PM  13 years agoPost 112
Garry-Boy

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Moscow, Russia

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The only reason I can think why I have never had a problem with bending feathering spindles (or blade flutter) is that I uses ccpm.
The funny thing is that I did bend the spindle exactly on CCPM machine(9252)...
I don't thing that it depends of the swashplate it is more about your flying style..

Garry.

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11-08-2004 01:40 PM  13 years agoPost 113
blakka_1

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London/Enfield

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I don't think that it depends on the swashplate it is more about your flying style..
so basically if you have an aggressive flying style your gonna have problems with the evo because you will end up bending spindles in mid-flight causing flutter, and maybe a mid air boomstrike. This is what I am gathering from this topic.

hmm... thats exaclty how my evo died. All was fine, then there was flutter, then a boomstrike, then it was falling to its death.

this problem is a real shame because the evo is a great machine, i hope someone finds a fix for this soon, or brings out a harder spindle as I want to complete rebuilding my evo, but i'm scared of running into these problems again.

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11-08-2004 03:43 PM  13 years agoPost 114
Detroit Steve

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Michigan

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I'm still trying to bend one, what type of "hard 3D" manuevers bend the spindle? I've been running sab 600's, 1900 head speed, stock dampeners, stock paddles with lead weights, standard mix, and I am using all 9252's. Are there any video's of spindle's bending in flight? I feel kinda left out I've got around 27 gallons on my evo and have only replaced the balls and links on the collective and tail rotor pushrod. I haven't tried the ccpm on the evo yet, but that does sound like an interesting experiment. I've been loving flying my evo, it really is a great little 50 and very easy to travel with too. TSA has dropped her a few times by now for sure, and it has come through each time. Time for some warm weather evo fun, mulberry this weekend

Thanks

Steve

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11-08-2004 03:54 PM  13 years agoPost 115
Brian Bennett

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Dugway/Tooele UT, USA

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Ah come on Steve, everyone know you are just not flying it "hard enough"

Brian

Team MRC-Hirobo and Model Avionics Rep

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11-08-2004 06:12 PM  13 years agoPost 116
mudbogger2

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Hoschton,Ga.

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I have seen a few bend at my field but every time it was caused by over speeeding the head. Both times were during some setups and no govenor being used. headspeed was well over 2000 no 3d other than loops was being done by the pilot. when he landed the spindle was bent.

That being said I have been doing very hard 3d with mine and have not beent a spindle due to 3d flying. I also run a govenor. Mabey this problem is related to headspeed?

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11-08-2004 06:14 PM  13 years agoPost 117
NewHeli

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Pittsburgh, Pennsylvania, USA

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Yah I guess it's your flying style

NewHeli

Nathaniel Rice
Team YS Engines

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11-08-2004 06:50 PM  13 years agoPost 118
Detroit Steve

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Michigan

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Yeah, I use a governor too. Overspeeding could certainly be a cause of this problem. Good idea, how many people that have bent spindles use some type of governor?

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11-08-2004 06:56 PM  13 years agoPost 119
Kinger

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Granville, OH

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Only 27 gallons on your Evo Steve? I'm a little disappointed Figured you'd be at around 50 by now.........

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11-08-2004 09:40 PM  13 years agoPost 120
Garry-Boy

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Moscow, Russia

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Steve,
I used the governor 1850rpm, I used S9252, and CX dampers.
I don't know why did I do, But I know for sure what I didn't.
I didn't touch anything with my blades, not a boom nor a grass, I was just practicing as I'm usually do and I wouldn't say that it was pretty hard.

I think that it could be after a bad auto...when you land the heli harder than you should be.

Garry.

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HomeAircraftHelicopterHIROBOOther › EVO spindle keeps bending in flight
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