Go Back  RCU Forums > RC Boats > Speed - RC Gas Boats
Reload this Page >

Exhaust Help

Notices
Speed - RC Gas Boats Discuss gas RC boats right here!

Exhaust Help

Old 05-16-2012, 05:21 AM
  #1  
F1madness
Thread Starter
 
F1madness's Avatar
 
Join Date: Sep 2010
Location: Staffs, UNITED KINGDOM
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default Exhaust Help

Hi guys
im hoping to join club and race my F1 but need to change the exhaust to comply with rules
My engine is RCMK K30RZ on standard evo bottom end so 28.5cc and prop is 7015/3 if this helps at all
so after a shorter pipe that will be 80DB at 10mtrs away,needs to be shorter as if i add a stinger on the 1 i got its doesnt comply cos of being too long without cover
im looking at a couple but not unsure how the band works
2" band vs 0 band
heres the couple im looking at
and the CS28 from prestwichmodels
needs to order 1 as soon as possible so i can get it ready for 2 weeks time
thanks guys
Old 05-16-2012, 05:34 AM
  #2  
martno1fan
Senior Member
 
martno1fan's Avatar
 
Join Date: Jan 2005
Location: blackpool, UNITED KINGDOM
Posts: 11,390
Likes: 0
Received 1 Like on 1 Post
Default RE: Exhaust Help

Daz non of the American pipes will work as theyre too loud,the last one linked might be ok,it is quiet but i have no clue if its legal or not.I get mine here.

http://www.ebay.co.uk/itm/Stainless-...item20b4740768
Old 05-16-2012, 05:43 AM
  #3  
F1madness
Thread Starter
 
F1madness's Avatar
 
Join Date: Sep 2010
Location: Staffs, UNITED KINGDOM
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Cheers mart
this is the problem no states DB levels so makes it harder to try and find the right 1 to comply
i can always add a silencer aswell but need to stay with in the 2.5" exposed
Old 05-16-2012, 08:43 AM
  #4  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,676
Likes: 0
Received 16 Likes on 14 Posts
Default RE: Exhaust Help

The one that Mart linked to I don't know if it's quiet enough to be legal in the UK. If it's the same one that I saw at the Toledo show, the pipe is really heavy and could throw your CG off. Yes, it's that bad! It's a knock-off of the Jerotune pipe that was made famous in Germany. The original should be legal for you as I own a copy but it might be too loud yet for you. The quietest one that I own is an older Cooper Quiet pipe, no longer made.

This picture may be small but it's a comparison between the Quiet pipe and the Cooper Cobra which is very close in size to your Zippkit's pipe.

The problem with dB rules is the location of the site. Your pipe may be fine in one place but too loud in another as the sound can reflect depending on the environment. There was an IMPBA Internat's race here in the states that had this problem.
Attached Thumbnails Click image for larger version

Name:	Ay75724.jpg
Views:	36
Size:	21.6 KB
ID:	1763167  
Old 05-16-2012, 09:00 AM
  #5  
F1madness
Thread Starter
 
F1madness's Avatar
 
Join Date: Sep 2010
Location: Staffs, UNITED KINGDOM
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Thanks ron
the prolem i got is they state 80db at 10mtrs away and can only have 2.5" of exhaust uncovered if i run the fake OB cowl thats not a problem BUT its too loud as it is but cant add the silencer or it would be too much uncovered
so a shorter quieter pipe is the only way forward its just finding the right 1
if that 1 is heavy i can move the fuel bag forward to compensate but its not ideal really but once i know how it performs under race conditions and if anything needs changing i will do a new build with the nessary changes to the rules
I never planned on racing it but it will help prove my F1 design or help with moving forward with the design
Old 05-16-2012, 09:09 AM
  #6  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,676
Likes: 0
Received 16 Likes on 14 Posts
Default RE: Exhaust Help

This will give you an idea of how quiet the Cooper Quiet pipe is. I had it laying around and decided to try it out when I first built the Blast Cat. It since has been replaced with the Cooper Cobra.
[youtube]http://www.youtube.com/watch?v=ShgxO2Owrig&noredirect=1[/youtube]
I've probably got a video of my Drag Cat with the Jerotune clone on it.
Old 05-16-2012, 09:42 AM
  #7  
F1madness
Thread Starter
 
F1madness's Avatar
 
Join Date: Sep 2010
Location: Staffs, UNITED KINGDOM
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Thanks ron
its alot quieter than mine hehe
[youtube]http://www.youtube.com/watch?v=ef1X4oHGLBc[/youtube]
Old 05-16-2012, 03:07 PM
  #8  
HendricX
Senior Member
 
HendricX's Avatar
 
Join Date: Jan 2009
Location: Rotterdam - NL
Posts: 686
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Mart's link is OK .. as it's a copy of my design (original ones @ RCImport.nl)

They will meet the Naviga ruling .

And for Ron ... sorry to disappoint you .. but Jeroen-tune/elSpeedy is also a copy ... ha ha

Original design is a concept by Paul Swaelen (PPB) and me (HX-silencers) .. made by Jaap den Hartog (JdH-exhausts)

And we are no Germans .. we are Dutch .... :-)

For Daz ... see image .... > website [link=http://www.edelstahl-reso.de.tl/Home.htm]L I N K [/link]



This is the 27cc version ... there is a 400mm 30cc version too.

Edit .. did some photoshopping :



Prototype testrun : [link=http://www.youtube.com/watch?v=tV9i3edp5to&feature=youtu.be]L I N K[/link]

Old 05-16-2012, 10:41 PM
  #9  
martno1fan
Senior Member
 
martno1fan's Avatar
 
Join Date: Jan 2005
Location: blackpool, UNITED KINGDOM
Posts: 11,390
Likes: 0
Received 1 Like on 1 Post
Default RE: Exhaust Help

Hi Henk i allready recomended you to Daz i knew you designed that pipe,not even sure if it will work for him as i dont know the dimensions of his hull etc but im sure someone with the skills could custom make a pipe for his f1 tunnels if need be.
Mart
ps Daz those pipes ar obviously heavier than the ali pipes but i havent found them too bad but Ron does have a valid point,might not be too much of an isue seeing as yours is r exh and as you say move the fuel bag forward to compensate.
pps love this coment lol
And we are no Germans .. we are Dutch .... :-)
Old 05-16-2012, 11:17 PM
  #10  
F1madness
Thread Starter
 
F1madness's Avatar
 
Join Date: Sep 2010
Location: Staffs, UNITED KINGDOM
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Cheers guys
1 of those pipes hendricx will fit no probs i will email you later today when i get back for prices


Old 05-17-2012, 12:12 PM
  #11  
madmorgan
Senior Member
My Feedback: (2)
 
Join Date: Apr 2011
Location: elmira, NY
Posts: 775
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

where can one get  a reading of how much noise your pipe is letting out? or should i say can i take a rig somewhere and start it up and have the noise checked?
Old 05-17-2012, 01:05 PM
  #12  
HendricX
Senior Member
 
HendricX's Avatar
 
Join Date: Jan 2009
Location: Rotterdam - NL
Posts: 686
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

ORIGINAL: martno1fan
pps love this coment lol
And we are no Germans .. we are Dutch .... :-)
Just to be sure that "they" in the USA , do not think the good stuff only comes from Germany. :-)

And I can reveal .. that some goodies are made in Germany .. but designed/prototyped elsewhere. ;-)



ORIGINAL: madmorgan

where can one get a reading of how much noise your pipe is letting out?
Or should i say can i take a rig somewhere and start it up and have the noise checked?
Overhere the clubs have dB meters , cause they have to ... because race-rules forbit over 82dB.
Sometimes you can ask the police .. as they should have them.
Old 05-17-2012, 10:11 PM
  #13  
DaveMarles
Senior Member
 
Join Date: Mar 2005
Location: Sunny Cheshire UK, UNITED KINGDOM
Posts: 289
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help


ORIGINAL: HendricX


And I can reveal .. that some goodies are made in Germany .. but designed/prototyped elsewhere. ;-)


You got that one right :-)
Old 05-18-2012, 05:12 AM
  #14  
madmorgan
Senior Member
My Feedback: (2)
 
Join Date: Apr 2011
Location: elmira, NY
Posts: 775
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

figures ofcourse i guess if they have to ensure the law is being kept they would have to have em. thanks
Old 05-20-2012, 05:10 PM
  #15  
HendricX
Senior Member
 
HendricX's Avatar
 
Join Date: Jan 2009
Location: Rotterdam - NL
Posts: 686
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

Talking about quiet .....

QD / QDhotpipe with my HX-silencer.

[youtube]http://www.youtube.com/watch?v=khML2B6fmg0[/youtube]
Old 05-20-2012, 07:36 PM
  #16  
rangerfredbob
Senior Member
My Feedback: (13)
 
Join Date: Jul 2005
Location: Salem, OR
Posts: 1,686
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Exhaust Help

you can get Db meters online for fairly cheap, and if you have an I phone there's apparently an app for that... $.99 for the one I saw

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.