[NSRCA-discussion] Hyde mount question

[John Pavlick]

Mike,
 Yeah I know it doesn't really matter but... I MAY want to use a 140 Rx in this airplane later. As it stands now if you put the OS 120 on the mount using the most forward mounting holes the distance from the firewall to the spinner back plate is only 6 1/8". I remember the "standard" disatance being 6 3/8", that's why I'm asking the question. I know I can make it all work just fine but what if I want to change the engine later? It would be nice to just bolt it in using the correct holes in the mount. If I knew exactly which holes to use for the OS 120 that would be fine assuming that there are also other sets of holes that would work for any of the compatible engines AND position them exactly the same distance from the firewall. That's my understanding of how a "universal" engine mount should work. So... if the proper holes in this mouint for the OS 120Ax are the forward ones I'll just line everything up accordingly.

John Pavlick
http://www.idseng.com
  ----- Original Message ----- 
  From: Mike Hester 
  To: General pattern discussion 
  Sent: Saturday, November 01, 2008 12:16 PM
  Subject: Re: [NSRCA-discussion] Hyde mount question


  John,

  I'm not positive about the 120 size, but the 2 meter size is set up for a standard 6 3/8" distance. This was just sort of the number we agreed upon a couple years back. It seems to be a compromise that works ok for just about everything including some of the more obscure stuff.

  The "real" answer is, it doesn't matter, whatever fits the plane =)

  -Mike
    ----- Original Message ----- 
    From: John Pavlick 
    To: NSRCA Discussion 
    Sent: Saturday, November 01, 2008 12:04 PM
    Subject: [NSRCA-discussion] Hyde mount question


    I'm setting up a new airplane with a Hyde "Firm Idle" Type 'C' mount. I'm using an OS 120 Ax for this particular installation. There are a few sets of mounting holes on the beams. The OS 120 lines up with 2 of the 3 sets. One is located more forward than the other. I'm wondering which set of holes I should use. From what I understand, this is a "universal" mount and depending on which engine you use and which holes you use, you should end up at the same installed length. That way, theoretically, you can install the mount and swap engines without changing the spinner -> firewall distance.
    Has anyone used this mount and if so, what is the "standard" installed length? 

    John Pavlick
    http://www.idseng.com


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