RunRyder RC
WATCH
 1 page 627 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Installing HK Muffler On Radikal
04-26-2013 07:58 PM  5 years agoPost 1
561Larry

rrNovice

Abbotsford B.C.

My Posts: All  Forum  Topic

I'm building a Radikal v2 and purchased a HK offshore muffler
only to find it would not fit has sold on the Radikal due to it hitting the frame,so I made an extension (one less part and
gasket) and a rear support due to the length of the muffler.
The modification gets rid of the heavy steel connector and one gasket and gives 1/8" clearance between the frame and muffler.

Cheers Larry

https://rc.runryder.com/rr/clipboar...64/PICT0108.jpg

PM  EMAIL  GALLERY  Attn:RR  Quote
04-26-2013 09:39 PM  5 years agoPost 2
Carey Shurley

rrElite Veteran

Orlando, FL - USA

My Posts: All  Forum  Topic

if you made the extension out of aluminum, just be careful with it for a while

the reason the extension on the RJX and Hatori mufflers is now made out of steel is because back when it was made out of aluminum, it wouldn't stay tight and the muffler would either get loose or fall off.

Proprietor - Gas Powered Helicopters

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2013 02:15 AM  5 years agoPost 3
C.A.P.

rrApprentice

custer park IL.

My Posts: All  Forum  Topic

"extension out of aluminum"
I see you already solve the aluminum spacer warning Carey has mention, before he mentioned it,
The reason the mufflers came lose was the design in the first place, more muffler in the back then the front, this cause the engine vibration to resonate more to the longer extension in the back, causing the screw to come lose, and cause the gasket to leak

Your fix of putting what looks to be a stable support at the tail of the muffler should indeed decease uneven resonation helping with the screw and a gasket leak.

This the same basic fix Zenoah incorporates in all their engine where they use an 'extension out of aluminum'

Great job,

Wally
(Affiliation) RC-Aftermarket (Engine Modifier & Engine Designer)

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2013 02:23 AM  5 years agoPost 4
561Larry

rrNovice

Abbotsford B.C.

My Posts: All  Forum  Topic

Set Screws On Each Screw
I also install set screws on each bolt/screw to ensure they don't back off.
Cheers Larry

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2013 04:49 AM  5 years agoPost 5
C.A.P.

rrApprentice

custer park IL.

My Posts: All  Forum  Topic

To be sure, Do Not Dismiss Carey's warning to be "Cautious",

Steel and aluminum do not expand at the same rate, even with set screw in place, you should re-torque the screws to the same in lb after a few flights as the engines screw holes and the screw are not a perfect fit, and the screw hole themselves can in
large with heat expansion & vibration, losing the bind between your extension and exhaust port,
I would re torque after a few fights, then check again after a few more flights,
keep us posted on your project

Well thought out,

Wally
(Affiliation) RC-Aftermarket (Engine Modifier & Engine Designer)

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 627 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Installing HK Muffler On Radikal
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Sunday, October 21 - 7:56 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online