Greetings Gentlemen, I am quiet concerned about the ending of Mazda
rotary production and would like to see the Mistrel type av engine
fitted with a compound turbo system as per Pauls' CAD drawings.
Nothing short of brilliant!
We have just finished price negotiations on a Seawind 3000 incomplete
amphibian kit which we expect to take delivery of next month. We will be
installing a 20b Mazda on it with a compound turbo system. Yet to be
engineered. Quality reference from anyone having the needed knowledge in
turbine sizing/design would be highly appreciated.
All the manifolding/mountings will be scratch made in house. We have
located blade producers to handle blade assemblies. I grew up in a
family run machine shop and have 25 years as a Plant Engineering
Technician. Efforts are now moving forward on obtaining ample funding
for an additive machining center to produce honey combed interior shaft
assemblies and end covers to further reduce weight and bring production
costs down. 100 pounds of Monel reduced to 27 pounds of shaft leaves a
lot of time and material on the floor!
We also have a huge existing residential market use for an affordable 45
hp rotary with a blow down turbo. Which we will not disclose for
engineering with out an NDA. $5,000 for an Axiro is more than a bit much!
Cheers Ya-All, Michael Nash
Michael, A word of warning on the seawind, they are a real dog to fly.
Having that engine up there on the tail is a bad idea, they suffer badly
from gyroscopic precession when rolling into the turn.
A good friend of mine here killed himself trying to take off from a
lake, he hit a boat wake (not a big one) and it porpoised and dove in
killing him. They can only handle a very small choppiness on the water.
I flew it a few times and boy did it need a lot of rudder input to
co-ordinate in a turn. Changing power settings on final for landing was
a disaster, the pitch changed dramatically with throttle change. Just my
2 cents worth here
Michael. Chris in NZ.
With the CG that high I can see how that might happen. Any significant
impact at water level will cause a pitch down.
Paul Lamar
Thank you for your informative words...they have in fact pounded 15 of
these into the ground. The slowed prop does in fact impede airflow over
the elevator and rudder control surfaces particularly on final.
We had seriously thought about moving the 20B down into the aft fuse and
using carbon fiber drive shafts and magnetic couplings for low friction
loss to solve the GG issue. The high speed wing lacking lift is the
other demon. A Retractable hydrofoil to keep the nose up and clean might
help. Thank you for the "Heads UP" You caring words did not fall on deaf
ears. I think we will take it to the company that is trying to sell a
certified version Seawind and let them work to save their bacon. I won't
mind helping them work it out especially if it saves lives down the
road. Respectfully, Michael Nash in Virginia
I would lengthen the hull. You need more buoyancy forward.
Paul Lamar
Question, quote "thought about moving the 20B down into the aft fuse and
using carbon fiber drive shafts and magnetic couplings for low friction
loss to solve the GG issue".
I would like to know if their is a manufactured Magnetic Coupling you
intend to use, perhaps a link to it if possible? I think it sounds
interesting to lower the Mazda 20B engine into the fuselage, and use of
any other linking devices you have in mind to accomplish that placement?
George F. Curtis Jr.
Here is what I would do to get the CG down with a rotary.
Do it like Ken Welter did it but use a longer belt.
Leave a long skinny radiator up there in front of the belt.
Paul Lamar
Hi Michael,
Your idea of moving the engine into the fuselage is good but it
will not solve the problem. The main problem is the prop is so far above
the wing, when you have this situation you have a potential disaster in
the making. So, 15 have spudded in so far, I believe one of those killed
was their chief test pilot, I think it went into reverse pitch and that
was that. My friends one had auto pilot, and he always flew with it on
as it was such a dog.
Chris. Hoskins
The Coot and
http://www.lakeamphib.com/lakeamphib.htmthe Lake's are not
that bad. The Lake has been around for 50 years.
Paul Lamar
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