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Other › stiffer head may be in the future!!!!!
10-12-2005 03:04 AM  12 years agoPost 1
ECOHELI

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Connecticut

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i think our floppy and loose head problems may be solved!!!! i just found at work some diffrent size o-rings.they are slieghtly oversized when compared to the t-rex stock o-rings. i have just installed them (2 on each side) and the head seems a lot more secure yet still is movable. i havent flew with them just yet, im still waiting on some other parts. i think these o-rings will work out better than the fuel tube mod!! is anyone intrested.maybe i can get the parts # for the o-ring and some other t-rex owners can try them out! just thought i had to share the good news!

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10-12-2005 03:46 AM  12 years agoPost 2
poletime

rrNovice

vic Australia

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I'm sure whoever designed the T-rex knows a bit more about things thatn me but I have to say WHATS WITH THE O-RINGS !! What a crap Idea surely if the spindle shaft had a bigass bearing on each end there would be no movement at all and it would spin freely. Hey why didn't they put o-rings in the tail ?? Without the o-rings in there have you seen how much slop there is, there's heaps. I'm really tired of these o-ring issues and If I find something that works I'll let everyone know that's for sure.

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10-12-2005 03:56 AM  12 years agoPost 3
ECOHELI

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Connecticut

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you need some sort of movment for dampening. all the small vibrations then would be transmitted through the feathering shaft right to the head to the entire heli. the o-rings also help with the stability. some movement is needed just not that much. the new o-rings i found seem to take up alot of that slop.

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10-12-2005 04:25 AM  12 years agoPost 4
AceHelis

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Georgetown, Texas

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Explain
Is this in the stock head you are talking about or one of the metal heads?

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10-12-2005 04:59 AM  12 years agoPost 5
bevoduz

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Normal, IL

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I found some red o rings for rc cars that worked well for me, not sure about sizes or part numbers or brands but I like em

Bevoduz

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10-12-2005 05:08 AM  12 years agoPost 6
Tmaster

rrKey Veteran

TX

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The Orings are good to have. The provide a nice buffer for some of the rotor system parts in a crash. The also keep the heli from bobbing or nodding back and fourth, when hovering. If it was totally solid, you would have problems for sure, not to mention the poor spinning headbocks.

I agree It could be a little tighter, just add a extra o-rings or washers to the feathering shaft. Done.

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10-12-2005 06:48 AM  12 years agoPost 7
GTMAXX

rrApprentice

Canada

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Here's a pic with all the info needed on the Red O-rings for stiffer head dampening on the T-REX.

Todd

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10-12-2005 07:14 AM  12 years agoPost 8
helisfreak

rrApprentice

Arizona, USA

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I don't know why the heck does people keep complaining when the T-rex is the best flying micro heli out there... find another one that fly the same.. tell me about it.

All you need to do is put another o ring, make it 3... then it will be stiff enough to do anything you want.. i fly my T-rex 4 inches away from me... never got a problem... Landed on top of my carrying... .and alway tip over and hit the ground.... pick it up..t racking still super perfect... nothing go wrong...

I really don't know any other helicopter will do this.

If i got $, I will run my T-rex on 10s lithium.

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10-12-2005 07:39 AM  12 years agoPost 9
poletime

rrNovice

vic Australia

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Here's one that flys the same, the Zoom. The rotor head and levers work very well not a proplem in the world, the links don't clash, they're smooth and well designed. The T-rex with CCPM mod and upgraded rotor assembly flies like a Zoom out of the box. Unfortunately that's where the good things about the zoom stop.

Here's the solution. Zoom rotor assembly with the rest T-rex. Problem solved.

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10-12-2005 09:34 AM  12 years agoPost 10
dankers

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Melbourne, Australia

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Head damping is needed in a semi-rigid teetering system - its a lot more complicated than "vibrations".

Because the blade moving forward (advancing towards the direction of flight) is going faster than the blad going backwards, the advancing blade makes more lift. Using a semi-rigid system on a two blade heli changes the angle of attack not by pitching the airfoil up or down, but by changing the direction of the wind relative to the blade, it is there to with compensate the dissymmetry of lift.

Retreating side: flap down - angle of attack becomes larger - lift increases.

Advancing side: flap up - angle of attack becomes smaller - lift decreases.

The Rex is designed for all round flying hence it's softer feel - It'll 3D like this but harder o-rings would be better - two o-rings with the siffness used are a good compromise.

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