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HelicopterFuel-Helicopters New or Limited ActivityAvant › I2RC Avant Aurora Metal Tail Grips
01-24-2012 08:16 PM  6 years agoPost 1
GraZer

rrApprentice

Cape Town, South Africa

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I see I2RC have begun producing metal tail grips for the Aurora .
Works on the stock tail hub, but seems to use a different bearing stack. Same geometry as the stock Avant grips and are thus a direct replacement.

http://www.rc-tek.com/us_store/-ava...Cbr%3E-c73.html

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01-24-2012 08:29 PM  6 years agoPost 2
Justin Stuart (RIP)

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Plano, Texas

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Hi Grazer,

I have a set of those I2RC aftermarket tail grips in my posession. The I2 grips use a different bearing stack than the stock Avant grips and also use a little metal spacer at the root of the hub in order to give them the correct spacing (which you can see in the computer drawing in your link), but they do use the stock Avant tail hub and have the exact same geometry as the stock grips. You can see what they actually look like when fully assembled here:

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-25-2012 06:37 AM  6 years agoPost 3
GraZer

rrApprentice

Cape Town, South Africa

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Awesome! Thanks for the info Justin.
I mailed I2RC and they confirmed that the bearing stack is arranged radial/thrust/radial as opposed to the stock bearing stack of radial/radial/thrust.

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01-25-2012 06:47 AM  6 years agoPost 4
Dood

rrProfessor

Wescanson

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Why would they stack the bearings like that?
By not having the thrust bearing at the end, it defeats the purpose of having a thrust bearing at all! stupid.

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01-25-2012 10:42 AM  6 years agoPost 5
GraZer

rrApprentice

Cape Town, South Africa

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Actually it is far from stupid. It does not matter that the thrust bearing is in the middle as the force on it will be the same. Having the radial bearings further apart results in the grips being able to better cope with higher loads from the tail rotor disc.

This design has been the standard for Hirobo and JR helis for some years.

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01-25-2012 01:12 PM  6 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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These grips have essentially zero side-to-side play when mounted on the stock tail hub. The pitch arms line up perfectly with the stock pitch slider when mounted on the helicopter. However the bearings in these aftermarket grips are a little bit smaller than stock. As a result, it is impossible for me to know how durable they are or how long they will last for.

But they do look nice. No disputing that.

Guys, I must make this warning: If you're going to buy these I2 aftermarket metal tail grips for your Aurora, you're going to have to do so at your own risk. While they certainly look nice, and while I know that I2 makes a lot of quality aftermarket parts for other brands of helicopters, I do not personally have access to the specialized equipment necessary to thoroughly test them in order to find out how well they perform under load. Consequently I cannot personally "recommend" them to you as a "100% safe" and "thoroughly tested" alternative to the stock Avant tail grips.

In the past, we saw some people having problems trying to do their own DIY flybarless head conversions. As a result, Avant officially recommends AGAINST doing such DIY FBL head conversions because the stock Avant RigidCore FBL head has been thoroughly tested and is known to perform well. The same must be said for these aftermarket tail grips. Avant officially recommends AGAINST using anything other than their stock tail grips which have been thoroughly tested. So if anything bad happens to you as a result of your choice to use these aftermarket tail grips, you have been warned.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-25-2012 10:17 PM  6 years agoPost 7
Dood

rrProfessor

Wescanson

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Actually it is far from stupid. It does not matter that the thrust bearing is in the middle as the force on it will be the same. Having the radial bearings further apart results in the grips being able to better cope with higher loads from the tail rotor disc.

This design has been the standard for Hirobo and JR helis for some years.
Please think about what I'm saying.
By having a radial bearing at the end, it is being side-loaded and cannot do its job and perform as a radial bearing should. That radial bearing takes the full brunt of the load -- and at that point why even bother putting a thrust bearing in there at all?
By having the thrust bearing in the middle it benefits only the inner radial bearing.
Just because JR and Hirobo has a bastard way of doing something doesn't mean it makes sense.

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01-25-2012 11:21 PM  6 years agoPost 8
fatboyrob

rrNovice

nottingham uk

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avant would say that. they promise the earth and deliver very little how long should we have to wait for them to get their version out.bloody years probably. we need real info on these tail grips so lets get them fitted tested and post our thoughts on here

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01-26-2012 04:33 AM  6 years agoPost 9
GraZer

rrApprentice

Cape Town, South Africa

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Having a radial bearing at the end does not mean that it is being subjected to lateral load. This would be true if the load was being transmitted via the outer race, however in designs where the thrust bearing is in the middle the load from the thrust bearing is transmitted to the outer bearing via its inner race. Think of it this way, as the grip is exposed to centrifugal force the grip body transmits that load to the thrust bearing via the inner race of the thrust bearing. The thrust bearing in turn transmits that load to the outer radial bearing via the inner race of the radial bearing which finally transmits the load to the bolt at the end of the tail hub, still via the inner race. The opposite is true for radial/radial/thrust arrangements where the outer most radial bearing makes contact with the thrust bearing via its outer race.

I can assure you that there is no fault with the radial/thrust/radial arrangement and it employs perfectly sound logic

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02-02-2012 05:54 AM  6 years agoPost 10
blade3d

rrElite Veteran

New Jersey USA

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Check it out I bought a set absolutely no slop,, nice grips.

Blade3d

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02-02-2012 10:26 AM  6 years agoPost 11
GraZer

rrApprentice

Cape Town, South Africa

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Nice! Have you had a chance to give them a go?
Could you tell me what the OD of the bearings is?

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02-02-2012 01:56 PM  6 years agoPost 12
Justin Stuart (RIP)

rrMaster

Plano, Texas

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For the I2 grips, there are radial bearings of two sizes in use. The radial bearing which is furthest from the hub measures 10mm OD (which is the same size as stock), but the radial bearing which is closest to the hub measures only 9mm OD (smaller than stock). I assume that this was done in order to increase the amount of metal which is at the root of the grip in order to prevent the grip from tearing off the hub. Whether or not the use of this smaller bearing at the root of the grip will cause excessive wobble or play over time is difficult to determine. However when the grips are brand new, they do not have any noticable side-to-side play (wobble) when mounted on the stock tail hub.

For reference, the stock Avant tail uses 10mm OD radial bearings on both the inside and outside of the grip. The stock Avant tail also uses 10mm thrust bearings on the farthest part of the grip.

I do not definitively know if the I2 tail grips use any thrust bearings on the inside of grips between the two visible radial bearings. I have not completely disassembled the set of grips that I have in my possession. The outer radial bearing does not easily "fall out" if you tap the grip sideways on the table, so some heat may be required to remove the outer radial bearing in order to look inside.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-18-2012 03:40 AM  6 years agoPost 13
FLYERCLD

rrVeteran

Proctor, Arkansas

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So, have anyone put the grips to the test? I just ordered some and once I give them a go I'll give a report.

MA Whiplash Nitro
Avant Aurora X2
OS 91 HZ
YS120
VBAR BlueLine
DX18
AMA L504443

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03-18-2012 04:04 AM  6 years agoPost 14
Blax1

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Sydney Australia

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I just ordered some and once I give them a go I'll give a report.
Looking forward to that!!

I like them, they look great, very interested in anyone's actual flying experience with these...

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03-18-2012 04:46 AM  6 years agoPost 15
blade3d

rrElite Veteran

New Jersey USA

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Ah I have not tested mine yet,,should they fly any different I don't think so

Blade3d

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03-28-2012 10:12 AM  6 years agoPost 16
maj

rrVeteran

united Kingdom

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Have these on mine fit fine fly fine :-)

MJ

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03-28-2012 11:46 AM  6 years agoPost 17
FLYERCLD

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Proctor, Arkansas

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ok I put two flights with the blades grips and they fly just great. Mild 3D no problem, I'm not doing hardcore 3D yet but still the grips are ok.

MA Whiplash Nitro
Avant Aurora X2
OS 91 HZ
YS120
VBAR BlueLine
DX18
AMA L504443

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04-23-2012 06:31 PM  6 years agoPost 18
FLYERCLD

rrVeteran

Proctor, Arkansas

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Update, I put 5 to 6 more flights with the metal tail grips and still no problems.

MA Whiplash Nitro
Avant Aurora X2
OS 91 HZ
YS120
VBAR BlueLine
DX18
AMA L504443

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