Paul,

  Years ago there were two brothers from Venezuela with a Cozy powered by
 two
  Suzuki Swift engines that were Siamesed together.  They didn't share the
  same prop, but instead used two counter-rotating props.  The prop shafts
  shared the same centerline.  In cruise, they could shut down one engine
 and
  greatly reduce the fuel burn.  I don't see why this idea couldn't be
  applied to the rotary using two 13b engines.  It would require the use of
  belt drives.  I believe Wankel GMBH developed one along these lines they
  called the Wankel Twin-pack.  (discussed in your YouTube video)  I always
  thought that would make a great package for a larger plane if someone
  wanted to spend the time and money to work out all the details.

  Mark


 I've been tossing this idea around in my head, and I really like it.
 (This is why I was asking about reverse rotation and 3d models a few
 days ago).  It seems so neat to be able to have an almost completely
 independent twin setup in a single engine sized package.  The only
 interlink really is the sharing of the engine mount and perhaps some
 bearings in the prop shafts.  Both of those can be designed to a very
 low failure rate.

 I've roughly sketched out a few things, and it seems to me that the
 best way to go about it would be to face one engine forward, and the
 other backwards.  The backwards engine would drive a countershaft off
 the similar to some supercharger setups except off the flywheel side,
 and the forward facing engine could drive the external co-axial shaft.
  I think Mark was right that a belt drive setup would be best.  This
 setup has a couple of benefits over facing both engines the same way.
 First is that you can have the plugs all facing inwards and the
 exhaust and intake facing outwards.  This will make mounting of coil
 packs a bit easier, and will prevent exhaust from one engine heating
 the other up.  The intakes could possibly share a common filter and/or
 plenum depending on how you set them up.  Depending on the mounting
 setup, you may be able to keep the engines a little closer together.
 The countershaft could also provide a great moment arm to resist the
 bending moment from the props

 If one did want to keep both engines pointing the same direction, a
 gearbox type setup with a reverse idler would certainly work.  I think
 it would be more expensive to do that way, and possibly a little
 heavier as well.  You'd have to worry with oiling too.

 Anyone have any thoughts?


 Josh


Are you talking about twin engines driving a single prop, or a twin setup
with independent engines, props, etc?

Kevin Alderman



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