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HelicopterMiniature Aircraft Whiplash & Fury 55 › Furry 55 Main Shaft Problems Or So I Think
04-06-2011 12:59 AM  6 years agoPost 1
godspeed128

rrApprentice

NC

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I have a Fury 55 and it has the Solid Main Shaft in it I thought I had bad bearings I noticed that there was alot of play if i push the main shaft side to side or front to back. I put a new 10mm Hollow Main Shaft MA128-43 in and all was very tight! just about zero play so now im concerned that the hollow main shaft is not as strong and as the solid one also why do I have play and why should I have to replace a main shaft

There is nothing in this world constant, but inconsistency.

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04-06-2011 01:39 AM  6 years agoPost 2
MinAirUSA

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Bavaria, Germany

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Please do not use the Hollow shafts, they were recalled last year due to being incorrectly manufactured.

The solid shafts were made slightly smaller because the fit was a little tight due to the production tolerances of not only the shafts, but the heim bearing as well..

The model will fly fine with the solid shaft, please discard the hollow one right away.

Miniature Aircraft

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04-06-2011 03:14 AM  6 years agoPost 3
dre4473

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Clarksburg WVa

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Main shaft

NOW THATS CUSTOMER SUPPORT!!!!

Donald R. Edwards JR Fly it like you stole it!!!

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04-06-2011 03:24 AM  6 years agoPost 4
godspeed128

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NC

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What to do

Well what am I to do will the 3 or 4 old shafts that I have that are new in the package ?

There is nothing in this world constant, but inconsistency.

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04-06-2011 03:50 AM  6 years agoPost 5
MinAirUSA

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Bavaria, Germany

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We will of course replace them. I'm a little concerned which retailer would still be selling the hollow shafts, as they were all recalled.

Miniature Aircraft

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04-06-2011 04:28 AM  6 years agoPost 6
godspeed128

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NC

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It's been some time ago I just found some more in my stash

There is nothing in this world constant, but inconsistency.

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04-06-2011 02:24 PM  6 years agoPost 7
3D Heli Ireland

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Ireland

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We will of course replace them.
You just can't ask for better than that ehh??!!

Skookum Robotics,Sav�x, Motors and Servos,Optipower,SwitchGlo,CML st

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04-06-2011 10:26 PM  6 years agoPost 8
airdodger

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Johnston USA

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Just so you know a hollow shaft is usually stronger.

Chris

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04-07-2011 02:01 AM  6 years agoPost 9
MinAirUSA

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Bavaria, Germany

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Just so you know a hollow shaft is usually stronger.
That's actually a common misconception. For a given weight, your statement would be true, but not comparing shaft to shaft.

Miniature Aircraft

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04-08-2011 01:53 AM  6 years agoPost 10
jadams

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East coast USA

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Not to go off topic but you guys gotta stop comparing shafts

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04-08-2011 02:09 AM  6 years agoPost 11
godspeed128

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NC

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shafts

This could get ugly

There is nothing in this world constant, but inconsistency.

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04-08-2011 02:27 AM  6 years agoPost 12
jphilli

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Atlanta, Ga.

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A shaft's ability to resist a bending moment comes from not only the material, but even more importantly the geometry. When you have an over sized (large diameter) hollow shaft that encounters a bending moment it acts to stretch and compress the shaft as you move radially outward from center. Say for example if you have a shaft of diameter D and you decide to hollow out the center of the shaft such that the hollowed out diameter is D/2, then you have 93% the ability to resist a given bending moment than the solid shaft. But the ratio of the surface areas of the hollow shaft to the solid shaft means that you're at 75% of the weight that you were at and we know how heavy solid shafts can be. However, you're also now at 75% of the ability to resist a given shear load but that's fine because you'll strip a main gear before you'll ever shear a hollowed out main shaft.

Same thing can be said for frames; if you space out the sides further apart then the CF is under much smaller bending moments but instead much higher compressive and tensile loads. This works out well because when one side of the frame is under compression, the other is under tension which is awesome because CF can resist quite a bit of tensile stress resulting in a much stiffer frame.

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04-08-2011 11:57 AM  6 years agoPost 13
airdodger

rrElite Veteran

Johnston USA

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I should have said for a given weight the hollow is stronger than the solid shaft. I would think that has exceptions also, like if it is used in a cantilevered, supported both ends, or torsional application, and possibly materials used.

Chris

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04-08-2011 12:44 PM  6 years agoPost 14
godspeed128

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NC

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Original concerns

Back to my original concern why wouldn't you want the shaft and bearings to have little or no play ? It just seems to me that the least amount of play would make a better flying helicopter. I'm sure there is some reasoning behind this. Now that being said Fury 55 Can fly way beyond my Abilities.

There is nothing in this world constant, but inconsistency.

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04-09-2011 12:53 PM  6 years agoPost 15
Thomas L Erb

rrKey Veteran

Alliance ohio

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Back to my original concern why wouldn't you want the shaft and bearings to have little or no play ?
0 lash has always been the goal of MinAir products.what Brian was saying was that the hollow shafts were to tight and required a lot of work to get them fitted and working well. Most every Min Air kit i have ever built needed some fitting of the main shaft but a lot of people i believe stopped when they got the shaft in the bearings and didnt pay attention to the swash fit as well. I believe this info to be correct.

This is just one of the reasons my Fury extreme has seen 6 seasons without a total teardown for bearing replacement. I do checks every winter but have yet to have needed to replace many parts as of yet. This heli is over 10 years old and still going strong

Tom

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04-09-2011 11:45 PM  6 years agoPost 16
kcordell

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O Fallon, MO

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As with any kit, and mostly since pretty much all I buid is MA stuff, first thing I do is clean the shaft, get the swashplate out and put it on the shaft. If it doens't fall the length of the shaft on its own, I chuck up the shaft and use some 600 grit paper with a little oil and go up and down the shaft. Reclean and try the swash again. Once it fits right, makes it much easier (and far less cussing) when putting the main shaft in with the bearings, auto hub, ect..

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

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04-11-2011 07:19 PM  6 years agoPost 17
godspeed128

rrApprentice

NC

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We will of course replace them.

We will of course replace them
Well I do have to say that Miniature Aircraft USA Support is the best I got the replacement shafts today ! Thanks MA !

There is nothing in this world constant, but inconsistency.

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06-30-2011 03:12 PM  6 years agoPost 18
TmMugen

rrKey Veteran

Tiny Little Red Dot aka Singapore

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Got to say MA is one of the best helicopter manufacturer that responds to our needs.

I am a noob flyer from Singapore! Team Nitro Magic

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08-22-2011 12:37 AM  6 years agoPost 19
VKGT

rrElite Veteran

Sanford, NC

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Please do not use the Hollow shafts, they were recalled last year due to being incorrectly manufactured.
That would explain why my main shaft bent today while flying! Glad I did a search to find this, I was extremely surprised when it happened.

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08-22-2011 01:29 AM  6 years agoPost 20
budz

rrApprentice

las vegas

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i was there and personally saw VKGT heli main shaft bend in the air. the heli was shaking like mad when they landed it.

team solo

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