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The height of the rotary is an issue in many aircraft
applications. Some height issues like the alternator
and waterpump outlet can be lowered some but it sounds
like the bare block is too high for your application.
The problem with lowering the thrust (center) line of
the engine effects many things, but especially the
length of the prop that you can use. For every inch
that you lower the engine you may be giving up two
inches of prop length.
This sounds to me like a good candidate for a plugs up
(turning the engine on its side) installation. You
should get in touch with Ed Anderson on this list as
he is running this way.
Jim Maher
--- Original Message ---
From: Scott <squiggles@yahoo.com>
To: "Rotary motors in aircraft"
<flyrotary@lancaironline.net>
Subject: [FlyRotary] Workable
>Good Afternoon...
>
>I would very much like to go with a rotary engine for
>my Zenith 801, however there is the problem of fitting
>it under the cowl using the Zenith's suggested
>thrustline(
>http://www.zenithair.com/stolch801/data/thrust.pdf ).
>I wanted to get your opinions on if a rotary
>installation will likely be successful without
>engineering/fabricating items.
>
>Defining a bare block 13b is just the block, no
>alternator, no water pump, oil filter, oil pan, etc.
>
>Using the following assumptions:
> - The aircraft thrust line is 200mm down from the
>top of the firewall.
> - The use of a redrive that is inline with the
>ecentric shaft, Real World Solutions, Ross. etc.
> - A bare block 13b is 345mm high.
> - The center of the eccentric shaft is 187mm from
>the top of the bare block 13b.
>
>Thus, if the engine was installed with the eccentric
>shaft 200mm from the top of the firewall I would have
>13mm or 1/2" to work with between the top of the
>engine and the top of the firewall/cowl. Most likely
>an unworkable number for the typical mortal.
>
>Zenith has okay'd lowering the thrust line 2"(50mm),
>which gives a grand total of about 2 1/2"(63mm) to
>work with above the engine block. There is the
>possibility of grabbing 1" (25mm) by increasing the
>cowl height in needed locations, but I would rather
>keep this as a last resort.
>
>Without going through significant engineering efforts
>is it likely a successful installation can be
>completed with only 2 1/2"(63.5mm) available above the
>engine block?
>
>The water pump with associated plumbing and intake
>runners are concerns which jump out at first blush.
>
>Any insight you can offer is greatly appreciated.
>
>Thank You.
>
>-Scott
>
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