Hello Jeff,
I have acquired a Velocity STD RG kit. The airframe is together
however the previous owner sold the Lycoming engine and mount. I see
that you offer for sale a mount plate for the Mazda 13b rotary. My
question is: will this mount plate adapt the 13b to the Lycoming engine
mount? If not with what mount does it work? With a bare fire wall and
the 5 mount points I wanted to send you an e-mail. I am very interested
in putting a 13b in my Velocity aircraft can you give me some more info
on your mounting plate?
Thank you,
Jerry Ames
Paul
this is your area of expertise....
jeff
Jerry, join the email list and I will do a free motor mount design for you.
Read the web site below.
http://www.rotaryeng.net/mm-instruct.html
Paul Lamar
Hello Paul,
I have seen these web pages before. Notice that with the cozy the
firewall appears
to be "L" shaped and with a Velocity the firewall is flat. I am curious
about the
front of the engine supporting member. I see that by your calculations
the
load is
minimal once the rear of the engine at the re-drive has been stabilized
however your
cadd model shows a member coming down to the center of the front of the
engine. How
/ where does this mount to the 13b motor and what interference issues if
any
are
there for the belt and pulleys that are on the front of the motor as well.
I agree
that the plate made by Jeff is of a superior design concept which is
exactly
why I
contacted him to begin with. I see that others have used an oil pan
adapter
type
mount for the Velocity... In my opinion a bad engineering idea to begin
with.
So here I am. Examples of Rotary powered Velocities do exist but do any
have the
adapter plate made by Jeff? If not what do we / I have to do to bring this
to life??
Your help is greatly appreciated.
Thank you,
Jerry Ames
My philosophy on brackets is; you over design them because they are small
and it does
not add significant weight.
That was the front motor mount in the case of a pusher. There are several
ways of
doing that. Here are a few. We have settled on welding the front mount to
an
oil pan
either steel or aluminum. If you make a custom pan you can add oil capacity
which
helps oil cooling on climb out. My 230 HP O-470 has 12 quarts. Most cars
have only 5.
A second way of doing it was invented years ago by Power Sport. That is a
horizontal
strut mounted to the top of the engine. If you are interested in that I
will
send
pictures and drawings. Both work equally well except for low cowls. There
is
a bit of
a clearance issue with the top strut under the wrap over intake manifolds.
As far as I know no pusher has Jeff's plate yet but it has only been
available for
about a year. Here is a crashed BD4 with an early version milled by
someone
else. It
survived rather well compared to the wrinkle in the fuse :) I have now
gone
up on
the diameter of the lower MM tubes to make it stronger for crashing :).
Paul Lamar
Jerry, the machine work, and engineering of Jeff's mount plate is first
rate. You
will not be disappointed.
Has anyone found a new supplier for the vibration damping rod ends?
McMaster-Carr no
longer carries them.
C. Smith
Insulated rod ends are available from midwestcontrol.com . I got mine
from
them as MC Master will not sell outside of the states. I must be a
terrorist or something and they are saving America. Paul what caused the
crash pictured as it is a rotary?? Neil.
It is the present U.S. Gov and our communist president destroying every
private
business they can using excessive Gov regulation. I am moving to China if
he gets
reelected :) It is ironic that previously communist China is whole
heartily embracing
capitalism. Shows just how far out of touch our current president is.
Over the hill Pilot error attempting a go around :) Also notice the motor
mount was
strong enough to clean the carbon fiber blades off the prop hub. That was
about at
least a 600 foot pound torsional load on the motor mount :) We found
parts of the
blades 200 feet away.
Paul Lamar
Paul,
When designing a mount for a pusher do you take into consideration the
need
to deflect the forward trajectory of the engine assembly from going into
the cabin
in then even of a crash?
roger Paxton
If you hit hard enough for the engine to get past the spar you are likely to get
killed by the impact.
Paul Lamar
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