> > > The 801 for Patrick Wrase. He is in line for an engine mount. Here
 > > > is some old stuff from around beginning of this month. Jerry
 > > >
 > > >
 > > > OK I assume he wants the 13B trust line moved down 56.94 mm down
 > > > from the Lycoming position based on the attached FW-DWG2.JPG dwg.
 > > > Is that correct? We will use the upper hard point for the rear mount
 > > > strut.
 > > >
 > > > Paul Lamar ...No rotor no motor.
 > >
 > >
 > > Hi Paul,
 > >
 > > As you mention, drawing FW-DWG2 is the correct layout for the 801. If
 > > the thrust is lowered by the 56.94mm this will allow for a bit of
 > > clearance, about 1", between the cowl and the modified water pump
 > > outlet. There should be sufficient ground clearance as the Zenith
 > > drawing BOTTOM-HALF.JPG describes 15.5" of ground clearance with the
 > > Sensenich S76EM8 with the O-360 thrust location. Although when I scale
 > > the distance from the stock thrust line to the ground on drawing
 > > COWL-DIMS.JPG I come up with 48.31" which would leave about 10" at the
 > > stock location and therefore slightly less than 8" if lowered by
 > > 56.94mm. What is your opinion on this modification? I would rather not
 > > have to bubble the cowl if possible.
 > >
 > > The top mount point attaches to the forward fuselage tubular frame at
 > > the 40mm x 100mm plate with two 3/8" bolts.
 > >
 > > Jerry, the engine is a 1988 13B, not the Renesis.
 > >
 > > Thanks
 > > Pat
 > >
 > > 13B not RX8/Renesis that changes things. Makes the alternator easier
 > > to mount on the side. You need to cut your water pump down Pat.
 > > I have a step by step to do that.
 > >
 > > -------------------------------------------------------------
 > >
 > > Pat, OK here is what it looks like with the thrust line lowered 59 mm.
 > >
 > > Too tight. I think we are better off with the stock Lycoming thrust
 > > line as that gives us more room behind the engine and more prop clearance
 > > for rough fields. All you must do is cut down the water pump.
 > >
 > > If you lower the thrust line the cowl will need major modifications.
 > >
 > > Another option, keeping the thrust line at the Lyc location, is extending
 > > the cowl 2.6 inches. The CG of the Mazda is about where the Schertz
 > > beam is. That is further aft than the Lycoming. The Lyc CG is 362 mm
 > behind
 > > the prop flange and the 13B CG is 430 mm behind the prop flange. That
 > means
 > > you can push the engine forward about 2.6 inches and keep the weight
 > > and balance the same. It is easy to extend the cowl as all you need is
 > > a 2.6" wide flat strip all around the back side of the cowl.
 > >
 > > This is what I recommend. Gives max room behind the engine for rear
 > > motor mount and accessories. Also provides more room for the cooling rad.
 > > --
 > > Paul Lamar ...No rotor no motor.
 >
 >
 > Paul,
 >
 > I am in agreement with your recommendation for keeping the lycoming
 > thrust line and extending the engine out 2.6". Thanks for the photos on
 > the water pump modification, I was unaware of this improvement. I will
 > plan to cut the water pump down to fit with the thrust line the same as
 > the Lycoming.
 >
 > Pat
 >
 > If you need some help with the water pump let me know.
 > I have a CC mill. I have done two so far.
 > Jerry could do the tig welding part.
 >
 > BTW we were ahead of our time with that water pump mod :)
 > Mazda incorporated one of its improvements in the RX8
 > water pump. Namely doing away with the outlet restriction which
 > never made sense to me. The pressure cap can be anywhere high.
 > A Corvette pressure tank on the firewall makes a lot of sense with
 > the 30 psi pressure cap on that.
 >
 > Here is what it will look like at the Lyc thrust line
 > location moved forward about 2.6 inches.
 > Plenty of room for a large rad.
 >
 > Paul Lamar ...No rotor no motor.

PATRICK WRASE wrote:

  Paul,

I really appreciate your preparig the 801 mount drawing, it looks
great.  I am glad that I will be able to keep the Lycoming thrust line.
I will need to take a better look at the pump housing to see if I can
get this done.  If not, I will contact you to inquire about your milling
services.

Thanks,
Pat

There is another advantage I did not mention before. The larger the
dia. of the prop the better the low speed thrust. Helps getting an STOL off in
a short distance and climb out at low speeds. Rotaries are great for
STOL as they have a lot more power for the same weight. With enough
power and a much bigger prop you have a helicopter :)

It will be done with the mount in a couple of days. Jerry and I are still working
on the Lancair mount.