RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2358 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › RJX style muffler internals - Opened like tin can
10-22-2012 06:48 PM  5 years agoPost 1
c3pio

rrNovice

Rockville MD US - Athens GR

My Posts: All  Forum  Topic

Yesterday I was flying around with my Spectra baffled since I have a slight tail wagging I can't figure out what causes it, when I realized an engine sound change. Sound was higher pitch and because I couldn't see clearly due to distance I immediately thought that one of the muffler screws was loose. Brought the heli closer for s better look and my jaw dropped on the ground. I've seen a lot in this hobby but I tell you what, never could imagine to see a muffler opened like a tin can during normal operation. You can see from photos that there's probably a weak spot where the muffler cracked. My guess is that the crack is probably due to metal fatigue and/or poor workmanship.

Uploading the photos, a thought crossed my mind. Could this be the result of vibration?? Vibration in the pitch axis??

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 07:44 PM  5 years agoPost 2
hirobo fan

rrNovice

edgewood,md

My Posts: All  Forum  Topic

wow, thats something. is this a true rjx pipe? does it say rjx on the side of the pipe ??

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 07:51 PM  5 years agoPost 3
Azalin

rrApprentice

Ankara-Turkey

My Posts: All  Forum  Topic

err, yes its a real RJX pipe.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:00 PM  5 years agoPost 4
Carey Shurley

rrElite Veteran

Orlando, FL - USA

My Posts: All  Forum  Topic

as many have pointed out, "But they are much less expensive than some of their competitors". This is one of many similar reports I've heard. You can draw your own conclusions.

at least it didn't go through your rotorhead

Proprietor - Gas Powered Helicopters

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:02 PM  5 years agoPost 5
Azalin

rrApprentice

Ankara-Turkey

My Posts: All  Forum  Topic

BTW I have seen this before. A guy posted the same here on RR. It was the same RJX.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:28 PM  5 years agoPost 6
DEDO

rrApprentice

FREDERICA, DE.

My Posts: All  Forum  Topic

How old is this muffler?
I have about 70 Flts on one of these RJX pipes on a 29 motor.
No problems,or leaks with mine.

Peace Out BOBBY D.
"GOBLIN PRo GASSER"
ZeN G290,HC3SX,MKS,
Maidened 8/24/12 FL

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:35 PM  5 years agoPost 7
Carey Shurley

rrElite Veteran

Orlando, FL - USA

My Posts: All  Forum  Topic

my guess would be that the materials or the mfg process isn't consistent. If it works it works

might be interesting to know if this particular one was acquired from RJX or was it one of the $50 versions from HK

Proprietor - Gas Powered Helicopters

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:39 PM  5 years agoPost 8
fastflyer20

rrKey Veteran

N. Tonawanda, NY

My Posts: All  Forum  Topic

I had one from RJX (not HK) rip open just like this. Our TIG welder at work "fixed it", not pretty but it is functional.

I suspect that the production process is inducing stress in this area.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:40 PM  5 years agoPost 9
Doug Darby

rrVeteran

Dallas, Texas

My Posts: All  Forum  Topic

Would be interesting to see what the broken edges of the pipe look like. You should be able to see any possible impurities in the weld and where it might have started to weep or leak prior to letting go. But it sure did break...

This is one of those Free Helicopter incidents. You could have just as easily ended up with a basket of junk had it gone through the rotors...

Very lucky today...

doug

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 08:47 PM  5 years agoPost 10
c3pio

rrNovice

Rockville MD US - Athens GR

My Posts: All  Forum  Topic

@ hirobo fan
It's not a true RJX but my feeling is that the two of them (the original from copy) shouldn't be that different.

@Carey Shurley
as many have pointed out, "But they are much less expensive .... draw your own conclusions.
You can say that again!!

If it went through the rotor head we would have a "Houston we got a problem" situation....

@Azalin
Really?? Where's the thread??

@ DEDO
Don't know exact no of flights but judging from the cosmetic condition it's fairly new. I'd say less than 20 flts.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 10:59 PM  5 years agoPost 11
Azalin

rrApprentice

Ankara-Turkey

My Posts: All  Forum  Topic

Sorry I couldn't find that post but most will remember that cracked RJX. Maybe they can help me finding.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2012 11:01 PM  5 years agoPost 12
Azalin

rrApprentice

Ankara-Turkey

My Posts: All  Forum  Topic

[url=http://www.helifreak.com/showpost.php?p=4120306&postcount=21]

At least I could find this.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2012 01:00 AM  5 years agoPost 13
ldtauris

rrNovice

Utica N.Y.

My Posts: All  Forum  Topic

RJX muffler
Here is my RJX muffler on my Trex 700 Helibug. Heard a pop during flight landed and found this.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2012 01:30 AM  5 years agoPost 14
rbort

rrProfessor

Franklin, MA - USA

My Posts: All  Forum  Topic

This happens all the time with this muffler
I saw it personally myself also on someone else's heli and read about it on the forums as well.

Dedo's muffler is holding up but he runs very slow headspeed, 1280 to 1580 or so - tached his whiplash yesterday. Lower frequency vibrations are not as damaging as high frequency vibes.

Try the century torpedo v2 pipe, NOT the v5 they plug up in short order, and use the tip on the end to save your hearing. They give good power and are light. Best choice in my opinion short of the tuned pipe stuff people are trying (no experience with that yet).

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3300 flts
Whiplash V1-2 Hanson 300, 1590 flts
Whiplash V2 Hanson 300, 437 flts

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-23-2012 09:00 AM  5 years agoPost 15
c3pio

rrNovice

Rockville MD US - Athens GR

My Posts: All  Forum  Topic

@ fastflyer20
Cosmetics vs functionality , the latter wins for me. I have a good welder around and probably give it to him to fix it. As a mater of fact it was the first thing I thought about when I saw what happened.

@ Doug Darby
Visually and through the lens (X3) can't see anything. I've always wanted to one of these super duper usb microscopes - hd cameras to have another look around but never made it....
.... Very lucky today...
It was time for some luck after so much jinx

@ rbort
I started considering a tuned pipe but the $250 that costs is in a galaxy far far away at this time. Priority is to make the Spectra FBL since I got a SK540 waiting but no head yet. I'll probably weld the muffler and after FBL I'll follow your advice and get the v2.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2012 03:06 PM  5 years agoPost 16
rbort

rrProfessor

Franklin, MA - USA

My Posts: All  Forum  Topic

About the Spectra
Priority is to make the Spectra FBL since I got a SK540 waiting but no head yet.
Which head do you have on it now?

I have the tempest head on mine and it was as simple as taking out parts (flybar cage) and putting the long balls thru the arms on top.

Also take the standard black hub, cut off the sleeve on one side, flip it and drill 2 holes for long setscrews to fix it on the shaft. The mixing arms can be trimmed and rounded off with a dremel tool and fine sandpaper afterwards to clean up.

You can do that conversion and the head works really nice flybarless. Just a thought for you.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3300 flts
Whiplash V1-2 Hanson 300, 1590 flts
Whiplash V2 Hanson 300, 437 flts

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-23-2012 05:04 PM  5 years agoPost 17
c3pio

rrNovice

Rockville MD US - Athens GR

My Posts: All  Forum  Topic

@ Raja

Thanks for the info. I've seen a thread (can't remember if it was here or HF) where you described the procedure. However, I don't have the tempest head. I have an older model (my guess) with plastic grips and arms. So the geometry just doesn't work. shawmcky has a spare tempest head, have pm'ed him but seems he's busy...so I'm considering a rjx head.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-25-2012 06:55 PM  5 years agoPost 18
geomecc

rrKey Veteran

Long Island ,NY

My Posts: All  Forum  Topic

i have seen where if you take the bell crank off the plastic blade grip remove one of the ball use a long screw through the grip and screw the bell crank onto the grip so that it's perpendicular to the grip. it's ugly but it works

R I P Roman Jr. Team SKOOKUM SRW EFC

PM  EMAIL  GALLERY  Attn:RR  Quote
10-27-2012 09:39 AM  5 years agoPost 19
RJX HOBBY

rrNovice

China

My Posts: All  Forum  Topic

Hello @ all,

the RJX gasser muffler was longer time ago already updated to avoid this issue.
Please contact our head office for replacement in case your muffler is broken.

Best Regards
Frank

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
10-27-2012 01:40 PM  5 years agoPost 20
wingtip

rrApprentice

Indiana

My Posts: All  Forum  Topic

i agree with carey, these days its just companies using thinner materials and cheaper materials to save a buck....

vibrations shouldnt have caused that and if they had it wouldve been very very obvious vibes to the point it wouldve been your own fault for flying it ... lol

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2358 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › RJX style muffler internals - Opened like tin can
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Friday, August 17 - 8:17 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online