[SPAM] Re: OS 1.4 RX Header and Pipe installation in Focus II

[Bob Harden]

Ok, I agree the 23% nitro is not necessary; been running YS engines for a long time.  I'll look into the MACs headers and other prop sizes.

Bob
  ----- Original Message ----- 
  From: Chris Moon 
  To: Robert Harden ; discussion at nsrca.org 
  Sent: Tuesday, September 13, 2005 3:29 PM
  Subject: [SPAM] Re: OS 1.4 RX Header and Pipe installation in Focus II


  Bob:
      I know that Macs has header with different rises than the OS.  I have a 2 1/4" rise header that I got from them that I run in my Eclipse (s).  Just my opinion, but I think the 23% nitro is not necessary at all.  I would not expect anything as far as better performance over 15%.  Also, the 17-13 might be more load than it likes, especially when it is new and you are trying break in the motor.  I thought the 17-12 was the best 2 blade prop, or a 15 3/4 - 10 or 11 3 blade APC "Lockhart" for an awesome combination.

  Also - check out Ed Hartley's web site for lots of other OS pipe - prop etc combos

  http://www.rcpattern.com/2cycle.htm

  Chris


  Robert Harden wrote:

    I would like some advise for installing a header and pipe in a Focus II.  I have the OS 1.4 RX engine, the OS 72102100  Header and the OS T-6010 Tuned Silencer.  My problem is that the header has interference with the firewall. I don't really want to remove material from the firewall to gain clearance.  Is there another header that I could use?  My other question is if the OS Tuned Silencer is the best choice?  I also would like to know what the length should be if the tuned silencer is used.  I am planning to use an APC 17 X 13 prop and Magnum # 1  2 cycle fuel (approx 23% nitro).  All suggestions are welcome.

    Bob Harden
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