[NSRCA-discussion] Hyde mount question

Sat Nov 1 10:08:29 AKDT 2008

Yup Aquila. No need for a DZ in this one. :) With the 120 Ax it should be just about 9 lbs. So far it's going well - with any luck I'll maiden it tomorrow. As usual I made some changes so it took me a little longer to assemble than it should have. Hey it's not "O.C.D." it's "Attention to Detail"! I had to mod. the landing gear mount so that I could use Bolly gear but other than that it was a pretty straight-forward build. It's made in China but the alignment is pretty good as well as the fit / finish. It's covered in genuine Monokote too. That's a BIG plus. The covering is always one of the worst parts of a Chinese ARF.

OK I figured out the mount. Using an OS 160 as a reference the installed distance is in fact 6 3/8" from the firewall to the edge of the cowl. If you put the engine on the mount the spinner back plate will actually be about 6 7/16"" from the firewall so I gues the holes are placed to provide some clearance for the spinner -> cowl. Now, the OS 120 is just a little too short even if you use the front holes. Not a problem, I'll add a spacer behind the mount. Now I can easily change between 120 Ax, 140 Rx or 160 Fx. The only thing I have to do is install a spacer if I'm using the 120 Ax or remove it if I'm not. Neat. The AR 80 mount works the same way BTW.

John Pavlick
http://www.idseng.com
  ----- Original Message ----- 
  From: Mike Hester 
  To: General pattern discussion 
  Sent: Saturday, November 01, 2008 1:35 PM
  Subject: Re: [NSRCA-discussion] Hyde mount question

  I'm not positive, but my guess is if you want to install the 140 later, you'd just use the back holes and it SHOULD work. I think the only problem might come in if you got silly and put a DZ in there =)

  Aquilla I take it? Looks like a cool plane, care to share your impressions yet?

  -Mike

    ----- Original Message ----- 
    From: John Pavlick 
    To: General pattern discussion 
    Sent: Saturday, November 01, 2008 1:20 PM
    Subject: Re: [NSRCA-discussion] Hyde mount question

    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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