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
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