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A Main Hobbies . Boca Bearings . Modefo's RC Helicopters

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RJX Hobby Hurrican 50 - Xtreme 50 > Starter coupling problems
 
 
JohnDa
Senior Heliman
Location: England

Does anyone else have probles with the starter coupling, i'm on my second coupling, god know how meny grub screws i've gone through. i've loctie'd it evey time, it's positioned correct on the shaft, the last 4 out of 4 trips to the air field have been a complete waste of time, i've nearly had it with the extreme.
06-12-2008 08:18 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

I just measured a starter shaft and start coupler.

My spare shaft is 4.99mm and the Id of a new starter cone is 5.11mm I'm seeing very little play between them, certainly with only .12 its not something I consider excessive, the ones on my old Tiger 50 I couldn't keep tight and eventually replaced with a K&S.

I do however run a tap thru the grub screw hole to make sure the hole is clean and the grub screw will sit flush with the shaft and byte down into it, bit a blue 243 and I havn't had one come loose, this is the same start system that was on the Hurrican 50, I have two here and been flying them for 2.5 years

I replaced the original on Steven's X50 when I put the helical gear/pinion in so it's been about 6 months, I think the helical was available around January.

Try running a tap thru the starter cone and use a new grub to see if that solves the problem.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
06-12-2008 11:27 PM
HOMEPAGE  
 
 
Vteckz
Heliman
Location: Auckland, New Zealand

No No, it is a definite problem, and I think RJX seriously need to address it. It has happened to me just tonight, on my first start! It is such a pain to remove the bearing block and assembly as well.

Not to say that the rest of the machine isn't mind blowingly awesome!

"Beat On IT!"
06-13-2008 11:41 AM
HOMEPAGE  
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

If you remove the main gear, with a bit of finess you can remove the entire clutch bell assembly including the bearing block without loosening the engine, patience is a virtue and I've done it twice, once in New Orleans at a FF on the bench and once with our machine to regrease the starter one way in the clutch, after about 8 months we started to get a squeal and it was identified to the oneway and some grease took care of that.

I'm gonna have Rusty send me another starter shaft and starter cone and again check the tolerances.

Vteckz, can you please do us a favor and measure your start shaft OD and starter cone ID and report what you find, with this one set screw design and the "D" cut into the shaft the grub screw should be pulling the rear of the cone up tight around the circumfrence of the rear of the shaft and the grub byting down into the "D" cut of the shaft should be enough to secure it in place, unless the grub is not making flush contact with the shaft and it's not getting the full force to keep it in place.

Again if you don't have a 4mm tap to run thru the start cone hole you can always thread a 4mm bolt thru and make sure the threads are "clean" and verify the 4x4 grub screw is penetraiting the cone at a 90 degree angle and it's centered in the cone.

Let's try to figure out what exactly the problem is

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
06-13-2008 02:36 PM
HOMEPAGE  
 
 
JohnDa
Senior Heliman
Location: England

I'm off to my local RJX dealer tomorrow, I'm going to try a new starter shaft as well as a new coupling.
06-13-2008 08:02 PM
 
 
JohnDa
Senior Heliman
Location: England

Foxden,

Problem seems to have been solved, for now that is. I’ve installed a new shaft which I took a dremel to just square it off a bit better, I also used the dremel to take off a little bur on the end of the grub screw to make sure it gets full contact with the shaft.

On another note though, I told the guy in the shop about the problems I was having, he couldn't of given two f*%!s. I also enquired about the new decals apparently they're not out, strange as I am sure ive seen them on other helis and in the uk. The guy in the back gave him loads of info about new items coming out for the extreme he just couldn’t be bothered relaying it to the customer, very poor given they are the UK distributor.
06-15-2008 09:51 AM
 
 
helicrasher
Senior Heliman
Location: Belgium

Take a look there!

http://www.rcmarket.org/decals-for-...0-pr-21107.html

Mario
06-15-2008 10:47 AM
 
 
JohnDa
Senior Heliman
Location: England

They're the ones Mario, Can't believe they aren't available in the UK.
06-15-2008 12:00 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

Guys,

I'm pretty sure those were produced by the distributor and not RJX Hobby, I saw the same decals on an X50, I think it was Sebastian Z. and when I inquired he sent me a link to the RCmarket website.

RJX does have some new painted canopy's on the RJX Hobby web site but I haven't heard of any new decals that the owner/manufacturer of RJX Hobby has produced.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
06-15-2008 12:49 PM
HOMEPAGE  
 
 
Vteckz
Heliman
Location: Auckland, New Zealand

Ive checked over mine, and the grub screw seems to hold ok most of the time, However it seems if you have a really tight engine, or a hydrolock situation happen (like me) then the grub screw just simply does not hold on the face of the D, and spins around, striping the edges off. Perhaps and indent in the face of the D could provice better grip, or harder aluminium start shaft perhaps.....

"Beat On IT!"
06-16-2008 09:24 AM
HOMEPAGE  
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

you are turning your starter shaft in the hex adapter by hand to at least make sure the engine isnt hydolocked first aren't you? or are you just sticking the wand in and giving it a squeeze.

I'm running a 3S 6000ma pack on my starter and it will fire any gasser a or brand new YS91 with no effort at all so I need to make sure the engine turns over freely before applying the juice

trust me on this, I had a brand new YS91 in my P-Max and didn't shut the fuel off right away after a flight, I did depressurize thou and filled it back up and put the starter to it without trying to turn it over first, yes it hydrolocked and my starter snapped the hex adapter in half, the century hex adapter on the Predator had 2 "D" slots cut in it and 2 grub screws offset 90 degrees so the grubs are still pulling the adapter tight around the back side of the shaft and it snapped it like it was nothing I learned my lesson and now always make sure it turns free first.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
06-16-2008 01:16 PM
HOMEPAGE  
 
 
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RJX Hobby Hurrican 50 - Xtreme 50 > Starter coupling problems
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