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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityRJX › Extreme 50 head rod lengths
06-07-2009 10:24 AM  9 years agoPost 1
Heli kiwi

rrNovice

Brisbane Australia

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I've just built a Carbon Extreme 50 with the 09 head and tail rotor hub with all the upgrades available.
The build has been challenging at times with the numerous kit faults as described in previous forums here.
One problem I have experienced is the length of rods on the head, While assembling all the rods according to the drawings I have been unable to achieve zero pitch at level mixing levers etc while at mid stick and yes all rods have been measured centre to centre.
Does anybody know if there are different rod lengths for the 50? I have been using 2 manuals (because of my kit version) and the lengths are the same - I need to be able to shorten my pitch links at least 3-4mm and just about every link above the swashplate has bottomed out on the rods trying to make the numbers.
I decided to to go RJX because every man and his dog has a Trex and the RJX looks like it means buisness - Its a beautiful piece of machinery when assembled but it takes some fiddling and thinking to get it there when the kit doesn't cut it. I'm sure these things fly great too.
Any ideas here would be great guys.

Who ever said Kiwis can't fly................

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06-07-2009 11:06 AM  9 years agoPost 2
AllThumbs

rrVeteran

New Zealand

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Hey Heli Kiwi,

I bought an RJX earlier this year for the same reason.. so I can find my heli at fun fly's.. It's easy to spot an RJX amongst all the Rex's.. Actually, at Rotorua last weekend there were 3 RJX 50's flying around while most of the Rex's sat on the ground, but to be fair the weather was a little rough..
I built the Black carbon 08 version and the build was fun. A little difficult if it was you first heli, but if you have some experience it fairly straight forwards. Quality is great.
I followed the book for rods and like you came up a little off. So I re did the links once my servo's were up and runing. It was easier to get them correct once I knew where centre was.. I now have +/-14deg with levers level at 0..
But the instuctions were not far away.. I ended up at
Link A 32.5mm Link B 46.5 Link C 93mm.

It is an awesome heli & with the Redline53 flies like it's on steroids..

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06-08-2009 12:48 AM  9 years agoPost 3
Heli kiwi

rrNovice

Brisbane Australia

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Thanks, I've built many helis over the years and reckon this is the best of them all. I've picked up some Raptor ball links and used them on the long pitch rods - I now have the numbers required at zero mid range so hopefully I can get out and test fly when my head bolts arrive. The ones that came with the kit had been longer ones butchered to length so you cant get a nut onto them - the Raptor ones I brought are too short to get the nut on properly. Something so simple can stop you short just like that.

Who ever said Kiwis can't fly................

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06-08-2009 09:53 PM  9 years agoPost 4
alfred

rrVeteran

Australia, New South Wales, Mid North Coast

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LOL
Getting the links on the rods does take some serious effort, but then again they will never ever come off by themselves.
I know what you mean with getting some off parts as I had a long thread here, but to be Frank (pun intended ) RJX will make good on those parts and will do the up most to look after their Customers.
Mine had it's first hover moving around yesterday since RJX replaced the parts. The difference is night and day.
The thing runs like a swish watch now, despite the engine running so fat that the rubber deflector becomes a blur, but the heli and the fuel in the tank is as smooth as.

Back to the topic.
Mine is the pre-2009 version with the older 6mm spindle shaft, it's rod length given were spot on from the Swash plate up.
There was a 2 degree offset between top and bottom pitch, which just required 2 turns on the 3 rods below the Swash plate.
It's about as close as I have found with any other heli, including the top cost brands.

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