Webra Bragging

[GW]

Great info Matt.  Thanks!

I have often thought about using a 1/8" firewall for weight saving purpose, but most kits call for a 1/4".
I say I am going to try it each time, but back out at the last minute. 
Might do the 1/8" on the next fiberglass kit with a homemade Hyde-like  mount I have made from the info on Bobs site as well.

I have always thought the pipes were  louder than mufflers, you seem to prove otherwise, at least according to Mike and Emory regarding the "Stealthness" of your plane.    Gotta love that word Stealth.  I plan on using either the Bolly 480 or ES140XL pipe.   I have not commited ,yet, to either one.
Later,
GW
Gerald Williams
Webpage :  www.gwair.com
Email: gw at gwair.com


  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Thursday, September 19, 2002 7:46 PM
  Subject: Re: Webra Bragging


  Gerald,

  My set-up is straight forward as follows:

  Webra 145R, black head, with the standard Macs header. Both purchased from Piedmont (Lee Davis)

  OS/Hatori tuned pipe for the OS 140 RX or EFI. 23 1/4" from the exhaust flange to the first baffle, straight line

  My own soft mount I described in the March K Factor. It is based on the HYDE mount, is all wood including the beams. Bob Pastorello has some of the drawings on his web site. I followed his drawings for the absorber portion. Mine differs in that the beams are glued to the front plate and a box is built around the case with balsa and lite-ply. A standard HYDE soft mount is a must if you don't make your own.

  I use a ply wood nose ring of my own design but any standard nose ring will do the job, as long as it fits

  Model is a ZN-Line kit, Alliance. Their construction technique includes foam sheeting on the Kevlar for stiffness and sound suppression. This simple technique is extremely effective. You will find that Lance VanNostrand's and Grey Fowler's (AeroSlave) offerings have a similar construction. Also, take a look at the new Temptation offered by Piedmont; Lee Davis describes a similar sandwich in the shell of their fuselages

  My firewall is 1/8: aircraft ply for the front face plus a 1/8" lite ply "U" shaped crutch behind the firewall, extending about 4" toward the canopy. It keeps the fuselage from drumming in this area just behind the engine.

  Fuel I use is a special blend of Cool Power heli and standard fuel, to 15% nitro and 19% thinner oil. I have the details on Ed Hartley's RCPattern page

  Props are: take your pick, the stealthiest is a 15.5x12 apc 4 blade. The model is practically inaudible and a little spooky to fly because it's too quiet. The rest are about the same 17x12, 16x14 std and N, 16.5x13 std, all apc's. The 16.5x13 was used nearly exclusively during early running. The engine turns anywhere from 7500 to 8000 r's depending on the prop. It will run faster but does not have to. Power to burn on the 45 deg up 1 1/2 snap or the figure 9 with 3/2 rolls.

  Should you decide on a similar set-up, please contribute your findings to Ed Hartley's page

  Matt Kebabjian




  In a message dated 9/19/2002 7:36:02 AM Eastern Daylight Time, emorydmd at earthlink.net writes:



    Subj:Re: Webra Bragging 
    Date:9/19/2002 7:36:02 AM Eastern Daylight Time
    From:emorydmd at earthlink.net
    Reply-to:discussion at nsrca.org
    To:discussion at nsrca.org
    Sent from the Internet 



    Gerald,

    Matt's set-up is probably the most quiet I have ever heard. It makes almost no noise when it's flying. I had a chance to fly his Alliance and the Webra is a very strong engine. If my Tigers ever fail me, I think that would be a good choice.

    Emory.


      ----- Original Message ----- 
      From: GW 
      To: discussion at nsrca.org 
      Sent: Wednesday, September 18, 2002 9:32 PM
      Subject: Re: Webra Bragging


      Mike,

      I have very little personal experience with big 2S engines, but I witnessed yours and Emory Schroters <sp> 2S equipped planes this weekend at Huntsville , and was truly impressed with the lack of "noise" these planes made. Truly amazing.

      I believe it is a combination of many things that it took to make these 2 planes this quiet, not just a good muffler, or just a soft mount, or any one thing. A combo of all is what seems to be the ticket. Hope to accomplish this myself with my new T2K soon as well.

      If Matt's is quieter than yours and Emory's, then it must truly be a extremely quiet setup. 









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