Too Much Blade Clack *VIDEO*

Too Much Blade Clack *VIDEO*
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Too Much Blade Clack *VIDEO* - 11/27/2007 2:25:23 AM

xyster101

Posts: 829
Joined: 8/7/2007
From: Marysville, OH, USA
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So I think I might have reached a point on the heli where I need to go FP. I flew through 2 packs today and had blade clack 5 times and she fell or bounced across the floor each time. The canopy got pretty wrecked, but the heli is ok. The only thing I have not done is to trim the blades 1/2 inch.
I am flying in a large open caferia and I love to fly across the room full speed and then bank my turns, problem is when the heli gets about 45 degrees in a turn the blades hit. I guess I have reached the limit.

Some of the mods done:
Soloboss flybar
Xtreme grips + blades
5MM upper head extension
Xtreme motors

She flies great and I am good at flying over, under, and through the supports and lighting in there, but the blades smack on hard turns. Have I reached the limit or can the clack be reduced. I don't really want to cut down my nice Xtreme blades.

< Message edited by xyster101 -- 11/30/2007 3:30:21 AM >

Post #: 1

RE: Too Much Blade Clack - 11/27/2007 3:00:59 AM

soloboss

Posts: 1790
Joined: 9/17/2006
From: Fort Wayne, IN, USA
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I don't blame you for not wanting to cut the Xtreme blades. As stiff as they are, you are getting enough flex to clack blades? That's a lot of flex, but if you are pulling 2g turns, you're probably over the limit. So what else can be done to either limit flex or separate the blades more.
Wow. Are the grips tight on the upper and lower head? Might you get better performance if you tightened the grips on the blades? I just can't see the blades flexing that much. Are the grips flexing on the head? Since you are taking the blades out in the turns, you are not 'surprising' the flybar so the upper rotor is not inverting and clacking the lower blades. But if both the upper and lower rotor blades are in lift, why would the lower blades bend upward yet the upper blades don't bend as much?

I've wondered about a thin piece of aluminum, maybe .032 thick cut to about 4" long by 1/2" wide. It would be drilled to let the Xtreme grip blade mount screws, screw through the aluminum plate. It would also have a hole in it to allow the shafts to pass through. When mounted, the plate would sit directly on the tops of the lower blades and would be screwed down via the grip / blade mounting screws. The 4" long piece should stiffen the blades at the root to reduce the flex. Weight gain would be negligible. I'd only use one on the lower blades. It should stiffen the lowers enough to prevent clack. The weight is 2.6535g if you drill 2 holes for #2 screws and 1 hole at 1/4" - don't radius the corners - 2.6360g if you radius the corners 1/8". (Isn't cad wonderful?)

Just a thought - somebody clean up the idea and give it a try.

Soloboss

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Post #: 2

RE: Too Much Blade Clack - 11/27/2007 3:02:00 AM

eat2muchrice

Posts: 846
Joined: 11/8/2007
From: Novato, CA, USA
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what about extreme parts they claim to reduce blade crack up to 90%

longer inner and outer shafts?

heres a link http://www.bladecx2.com/upgrade_parts3.html

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Post #: 3

RE: Too Much Blade Clack - 11/27/2007 3:08:01 AM

evdreamer

Posts: 3060
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: offline

I had those parts and replaced them with the Xtreme parts. BladeCX2 parts are expensive and not worth it.

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Post #: 4

RE: Too Much Blade Clack - 11/27/2007 11:07:20 AM

xyster101

Posts: 829
Joined: 8/7/2007
From: Marysville, OH, USA
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Solo:
I have the grips loose so the blades will align properly, I found with them tight that they never aligned and would cause massive vibrations. I have the white Xtreme blades from boomtown and they have more flex then stock. I can see them bending as I go from a steep left banked turn to foward or right flight. The top blades are always fighting what I want to do and the lower blades bend tremendously up. I will try to do a video of it, but it is hard to film with my little digi camera.
I never thought of putting aluminum on the bottom. Might have to get some of that and give it a try.

eat2muchrice I am sure those parts would also work, just $65 price is a bit more then I want to spend. That is almost a FP heli! I do have the longer head, but lowering the bottom and extending the shafts would work also like that kit does. Wish I saw that about 2 months ago before I upgraded everything. Those parts are expensive and I can not get replacements at the LHS when I crash.

(in reply to evdreamer)

Post #: 5

RE: Too Much Blade Clack - 11/27/2007 1:43:46 PM

cx2cp+

Posts: 702
Joined: 9/26/2007
From: , AL, USA
Status: offline

go for the fp! - you will still enjoy your cx as it is stable and fun and a great quick fix when you think you are about to quit helis forever cause you can't break hover on the fp without crashing !!!

with the fp (and mucho experience) you can whip it up to a froth and never get blade clack cause the other rotor is on the tail and unless you go insane and chop the throttle in a high banked turn and get a boom strike, the blades can never clack

after you master the fp (i wish eflite made one) then there's the blade cp and inverted and bell mixing and all that jazz (way way way beyond me as yet)

be sure to make whatever fp you get crashproof by following the simple steps presented by the folks here

edge

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Post #: 6

RE: Too Much Blade Clack - 11/27/2007 6:26:39 PM

xyster101

Posts: 829
Joined: 8/7/2007
From: Marysville, OH, USA
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Thanks edge. Due to your PM a while ago I put the Walkera #4 on my Xmas list. Hope to get it, otherwise I will buy it myself. Yesterday I clipped a light about 20 feet up, even though she fell sideways, I was able to recover and not crash.

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Post #: 7

RE: Too Much Blade Clack - 11/30/2007 3:30:01 AM

xyster101

Posts: 829
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From: Marysville, OH, USA
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Flew and made a video, we all love videos. At the end I had to bail off camera, was going too fast. Here you can see towards the end how fast the little CX can get going. Problem is usually it tips too far and the blades will hit.

http://www.youtube.com/watch?v=GCQ8TC5LPHY

(in reply to xyster101)

Post #: 8

RE: Too Much Blade Clack *VIDEO* - 11/30/2007 3:32:11 PM

cx2cp+

Posts: 702
Joined: 9/26/2007
From: , AL, USA
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now, use the cx to hang garland or something from the beams - use light fishing line tied to the cx,fly it through the beams with the cx, then tie some garland to the end and pull it through the beams - instant christmas decorations thanks to your cx - also you could rescue whatever that is up there by attaching a hook to it with the cx

edge

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Post #: 9

RE: Too Much Blade Clack *VIDEO* - 11/30/2007 8:01:09 PM

xyster101

Posts: 829
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From: Marysville, OH, USA
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Haha, I never thought of that . There is a ton of dust up there! It would be neat to run fish line, but I could also just tie it to a stick and throw it over the beams.

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Post #: 10

RE: Too Much Blade Clack - 11/30/2007 10:33:50 PM

gnd2

Posts: 401
Joined: 5/23/2007
From: San Diego, CA, USA
Status: offline

quote:

ORIGINAL: xyster101

Flew and made a video, we all love videos. At the end I had to bail off camera, was going too fast. Here you can see towards the end how fast the little CX can get going. Problem is usually it tips too far and the blades will hit.

http://www.youtube.com/watch?v=GCQ8TC5LPHY

I love the musical selections

(in reply to xyster101)

Post #: 11

RE: Too Much Blade Clack *VIDEO* - 12/1/2007 2:22:37 AM

xyster101

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From: Marysville, OH, USA
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Thanks. I figured that they worked well with that flight section. Old TV themes

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Post #: 12

RE: Too Much Blade Clack - 12/1/2007 3:27:50 AM

soloboss

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From: Fort Wayne, IN, USA
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This is going to be a tough one to resolve. Maybe you are correct that the heli does have a maximum performance envelope - and you found it!.
As far as the grips running loose, I'm a scale flier and I run my grips really loose.
And the blade flex - I have thought that the Xtreme blades are a bit stiffer than the Eflight blades. Maybe I'm wrong on that one. If you are flying fast enough that a turn puts the heli at 45° you have to be hitting 2 g's in the turn - right? So why to the blades clack???? Have you tried running a lot less weight on the flybar? Less weight means less stability at hover, but it looks like hover is down around the bottom of your priority list.
You might try moving the weights inward a little at a time. That flybar may be causing the upper rotor to be inverting in the hard corner.
Maybe a better idea is to restrict the amount of travel available to the flybar. An O-ring round the head just above the flybar will limit the travel and reduce the extreme limit while leaving the hover unmolested.

Looking at my Xtreme setup, I found the answer to a peculiar vexation that I have been dealing with. I use the stock lower hub with aluminum drive pins (the big ones). My lower rotor assembly was really loose. My pins are too short and worked nearly out of the lower head. I need to put in longer pins and all will be well again. Thank you!

Your heli is looking really good in action. And of course its pilot is making it look good! Niece work

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Post #: 13

RE: Too Much Blade Clack *VIDEO* - 12/1/2007 3:45:49 AM

xyster101

Posts: 829
Joined: 8/7/2007
From: Marysville, OH, USA
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Thanks for the input Solo. I have your fly bar mod on there currently with one small wheel collar per side. I tried to move them in a little, but she gets the shakes pretty quick. It seems the top blades look ok, but the bottom ones bend way up in hard turns. An O ring might help, but to be honest your aluminum suggestion seems the best. I feel I am ready to move to a FP. With all the space at work the CX gets moving really fast, probably the same as a good run, and to recover from that speed leaves one of three results: One she levels out with some opposite input, Two she smacks into a wall because it will not react fast enough to the opposite inputs, Third the blades clack from too much input trying to avoid the wall.

(in reply to soloboss)