TEST- now motor mount Poll

[Ed Miller]

Center and "snubber bolt" size is 10-32 stainless steel with aluminum nylon lock nuts and aluminum washers. The engine hold down bolts are 6-32 steel with steel washers. The Rotomount in my EMC complete with all hardware, snubber block, lightly coated with epoxy and painted black was 2.6 ounces. My clayton foster nose ring with 2 4-40  aluminum bolts and blind nuts and lite ply mounting ring with lightening holes was just under an ounce. So the total engine mounting assembly including everything except firewall was 3.5 ounces. Firewall is 1/8" lite ply. The mount is constructed of maple beams tapered and pared down to hold the engine and the beams are glued to a 3/8'' plywood disc that has been lightened. The snubber and center bolts are surrounded by silicone tubing of 2 different outside diameters.
When I was building my EMC I was looking at every piece that went into it to ensure I would make the 11lb weight limit, plane ready to fly came out at 4861 grams or 10 lbs 11 oz. As a side note, I saved 24 grams in hardware but using either aluminum or stainless steel throughout the plane. One good thing about the rotomount is you don't get the slight side to side movement at the back of the engine that you do with the Hyde mount. Yeah, it takes some work and we seem to be in an era of buy and fly but with a little time and creativity, it can be done. Bob Pastorello has an excellent soft mount also.  
 
  ----- Original Message ----- 
  From: george kennie 
  To: discussion at nsrca.org 
  Sent: Friday, January 02, 2004 8:04 PM
  Subject: Re: TEST- now motor mount Poll


  Ed, 
  I'm curious as to what size center bolt you employ in your roto-mounts? I tried making one and the weight came out at a little over 5 ounces. I abandoned the idea in favor of a simplified version of a Hyde that I can make at 3&1/2 oz. With the exception of the Sig rails mine costs about 25 cents. 
  Georgie 
  Ed Miller wrote: 

    Hanson Rotomount and Clayton Foster nose ring get my vote. The Rotomount can be made very light and it's adjustable for firmness and thrust angle. I've had 5 planes with it without any problems. Works on the same principle as the Hyde mount in that it allows the engine to rotate along the crankshaft centerline. A side benefit is it costs less than 10 bucks to make.Ed M. 
      ----- Original Message -----
      From: Nat Penton
      To: discussion at nsrca.org
      Sent: Friday, January 02, 2004 5:02 PM
      Subject: Re: TEST
       Bill I believe if we could get people to convey their likes and dislikes on engine mounts we could all benefit. (At least we would'nt have to bring up the downwind turn).       Nat----- Original Message ----- 
        From: William C. Harden
        To: discussion at nsrca.org
        Sent: Friday, January 02, 2004 3:16 PM
        Subject: RE: TEST
          
        Quite on the list today, isn't it?

        Bill 


        -----Original Message----- 
        From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Dwayne & Nancy Brown 
        Sent: Friday, January 02, 2004 12:34 PM 
        To: Society of Antieque Modelers; Slow Flight RC; Senior Pattern Association; Pattern List; Pattern; GSAL 
        Subject: TEST 


        TEST
        Dwayne
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