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HelicopterAlignOther › 600N Frame Flex
08-10-2007 02:12 PM  10 years agoPost 1
hootowl

rrProfessor

Garnet Valley, Pa.

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The top portion of the frameset where the top bearing block is, is very flimsy. If there is any out of balance condition in the head it will flex the frames and cause the entire heli to shake.

Even a balanced system has inherent vibration during different flight conditions.

I'm saying I don't like a flimsy frame. Is it bad? I think it is. I have seen a few 600ns flying and they all seem to shake the landing gear in the same frequency as the head.

Any thoughts?

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 02:27 PM  10 years agoPost 2
DS 8717

rrProfessor

Here wishing i was​somewhere else

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Something must be loose with yours,there are 4 600's at our field and none of them exhibit that issue. The compass knight 3D has the same flex as the 600.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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08-10-2007 02:33 PM  10 years agoPost 3
hootowl

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Garnet Valley, Pa.

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I'll double check but I'm sure all is tight.

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 03:01 PM  10 years agoPost 4
SC Raptorman

rrVeteran

South Carolina

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Mine shook too till I took the GForce fan off and replaced it with the stock unit.

Oh what a feeling 3D Flying can be
Magnum Fuels

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08-10-2007 03:05 PM  10 years agoPost 5
tauscnc

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Joliet IL

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Just fly it, it flies great. Not everything on the heli has to be rock solid with 0 flex..something has to give a bit. Check to make sure everything is seated and tight.

taus

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08-10-2007 03:14 PM  10 years agoPost 6
creightoncarr

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Missouri City, Texas​- USA

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FWIW, the frames on my 600N bolt together solidly and there is not a whole lot of flex at the top bearing block or anywhere else. I certainly would not call it flimsy by any means. I have put any extra support spacer between the frames at the canopy standoffs, but it wasn't flimsy prior to that either.

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08-10-2007 03:17 PM  10 years agoPost 7
hootowl

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Garnet Valley, Pa.

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I agree with the "just fly it". As long as she holds together.

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 04:17 PM  10 years agoPost 8
dannyh5

rrApprentice

England

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I have a small amount of flex in the top half of the frames. Not a problem, best heli I have owned.

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08-10-2007 06:37 PM  10 years agoPost 9
MJWS

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Airdrie, AB - Canada

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I really don't get this complaint at all. My gear flexes more than the frame does there. The bearing blocks are a couple inches apart there it is pretty much solid carbon. We have the control shaft going through there, as well as servos acting as stressed members. The tail case is HUGE and locks the frames together well at many points.

You have to really reef on this thing to make if flex any more than any other bird. Just grab the mainshaft hold it in the air and lets see you flex that frame. That is the only place force comes from and it is distributed evenly among all three bearing blocks along the entire height of the frame. Tell me how that mainshaft can possibly twist this thing like you guys do on the bench? You are holding one point solid and twisting it unnaturally. AIR CAN'T DO THAT. The G's can't even come close.

Most of this reminds me of those guys that add 5 pounds of extra plywood to their planes becauses 'it wasn't strong enough' then they wonder why it doesn't fly well.

Mike

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08-10-2007 06:47 PM  10 years agoPost 10
hootowl

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Garnet Valley, Pa.

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The control shaft is a slip fit through bearings so there is almost zero benefit from it.

Servos are mounted on rubber grommets... again..no real structural benefit.

What I am surprised is how much it flexes locally, around the top bearing block. Those who have the sport model take a squeeze at portions of the frame. Then hold the central part of the frame tightly and grab the head. Move it side to side. It's not just a little, it's a lot.

I'm not adding anything. We'll see how this effects the heli as time goes by. Will the frames develop stress cracks where the most bending is occurring during flight?

These are just questions.. I'm not saying it's a real problem. When I see this amount of flex in a mechanical assy it just brings up questions about integrity of the design.

I only had one other heli that I noticed this amount of movement. It was a MA Gasser 1005. The upper frame moved enough to cause gear stripping issues on hard landings. It manipulated the alignment of the pinion to the main gear. I don't see this as an issue here but it does bother me with respect to vibes and frame cracking.

Maybe I should just shut up and fly.

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 07:13 PM  10 years agoPost 11
casper7

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UK southeast

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You should see the flex I have on my EVO 50, don't worry just fly

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08-10-2007 07:13 PM  10 years agoPost 12
jaxrotor

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Jacksonville FL

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ever seen the wing on a airliner flex? wonder why it does that....

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08-10-2007 07:28 PM  10 years agoPost 13
hootowl

rrProfessor

Garnet Valley, Pa.

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Helicopter airframes in real life don't flex like airplane wings. You guys are beggin

I have 10 years in Boeing. Some things have to flex, some don't.

I agree it will probably be fine but helis like to shake and flexible airframes like to shake.. bad for electronics and can cause fatigue cracking.

Also could effect flight performance.

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 07:37 PM  10 years agoPost 14
MJHiscott92504

rrVeteran

James Hiscott ,​Germany for past 11​months

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Hootowl

This is where 3 billet machined main shaft blocks would really benefit the 600N, I am keeping an eye out for some one to manufacture these pieces from billet aluminum, think ill give 3DX a call....Jim

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08-10-2007 07:43 PM  10 years agoPost 15
DS 8717

rrProfessor

Here wishing i was​somewhere else

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Just fly the damn things,you all worry about too much sh!t.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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08-10-2007 07:43 PM  10 years agoPost 16
hootowl

rrProfessor

Garnet Valley, Pa.

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I don't think billet blocks would do much. If you look at the top block when you flex the frame you can see that making it aluminum won't do much.

Now if the made the ends of the blocks where they contact the frames taller or added some type of flange to them so they had a larger footprint than that would help a lot.

Vario uses billet "X" frame spacers as do some other brands to add rigidity.

MR10X,

Hey one simple mod could make a huge difference.

Wolves don't lose sleep over the opinions of sheep

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08-10-2007 08:00 PM  10 years agoPost 17
jaxrotor

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Jacksonville FL

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metal bearing blocks are already available. two different sources that I know of...

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08-10-2007 08:01 PM  10 years agoPost 18
jaxrotor

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Jacksonville FL

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Been in Aviation for 23 years.. real machines flex...

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08-10-2007 08:06 PM  10 years agoPost 19
MJHiscott92504

rrVeteran

James Hiscott ,​Germany for past 11​months

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jaxrotor

Who has them?

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08-10-2007 08:08 PM  10 years agoPost 20
kingair

rrKey Veteran

Utah - USA

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Hey one simple mod could make a huge difference.
So are you saying that the difference would be in "huge" flight improvement? I doubt that!!! Where wound the "huge difference" come to play and what would the benefit be? Are you speculating that the huge difference would be in longer frame life due to reduced occurrences of stress cracks? I'm just not seeing how making it any stiffer would help anything. I agree with one of the other posters that said the main shaft is keeping the thing from flexing in the air.

There is a very fine line between "hobby" and "mental illness."

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HelicopterAlignOther › 600N Frame Flex
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