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Thread: Dynafocal mount ring

  1. #1

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    Dynafocal mount ring

    I have an engine mount ring here from a Beech Skipper that carried an O-235. This utilized 2½" mounts to carry the engine.
    All the larger engines commonly mount with 2¾" Lord mounts.
    I know engine swaps have been done putting O-320 on with the smaller rubber mounts but what are some thoughts of mounting an O-360 with the smaller cushions?
    My gut feeling is to not use this mount ring.

    What experience and opinions are out there about this?

  2. #2
    skysigns's Avatar
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    if needed i have 2 mounts for 0360 1 came off a cub crafters exp with oil cooler mounted to it and the other i think is a wag aero

  3. #3

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    Quote Originally Posted by skysigns View Post
    if needed i have 2 mounts for 0360 1 came off a cub crafters exp with oil cooler mounted to it and the other i think is a wag aero
    That may in time become of interest to me.

  4. #4
    Cub junkie's Avatar
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    Dyna focal 001.jpgDyna focal 005.jpgI build my own rings but have used the aircraft spruce ring for customers. I like to use the Lord aerobatic cup since its smaller and much more rigid.
    Thanks mike mcs repair thanked for this post

  5. #5

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    Is that Aerobatic cup in the 2½ size? if it is that would be the answer for the BE77 donor ring I have been sitting on for decades. I need to check locally if there is a case I can borrow to jig the mount as you are doing since i would like to position the case on my build table to tack everything together.

  6. #6
    Cub junkie's Avatar
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    Dyna focal 007.jpgNot in the shop right now or I would measure. 2 1/2 sounds bigger than what I use. Check out spruce part #08-03600. They are "homebuilders special" mounts. The cups in the picture I make off the Pitts print and put my own twist on them. They are easy lathe work from tubing and flat stock. The steel bushing in the pic is what I use for jigging, they simulate a compressed rubber mount. If you have a ring you find acceptable for your application I would go with it. The ring and ring kit spruce sells is asian sourced. The steel has that look under the hood when welding. Plenty good for non high G airplane. I don't have any fancy equipment so I still build mounts on the airframe. I get the best accuracy that way. I keep telling myself this is my last one but dam if I didn't also build a conical for this same airframe recently.

  7. #7

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    Spruce is stating 2" on that aerobatic mount, seems small but may well allow for use of the BE77 ring I have.

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