Hi Vladimir,
Think of starting with existing material
Don't reinvent the wheel.
Take a licence on what you can use from others or purchase for the
moment. There are rotaries out there already you know.
Keep the cost low. If you have 50 million, make a budget of 20 million,
perhaps you'll succeed.
Randolph
thank you randolph for your encouragement and advice.
unfortunately it is lack of any real reinvention of the rotary that has
limited the success of the many other companies that have tried to
solve its basic problems, namely sealing ability and maybe even its
tendency to grenade when detonation occurs. its a beautiful yet fragile
motor, but seal tightness being the main concern across the board, no
matter
the application.
han nguyen
You are completely wrong about the Wankel engine being fragile.
Wankel engines do not hand grenade.
You obviously have a lot more to learn about it.
Paul Lamar
Hi Han Nguyen,
Gas seal problems for the **production** Mazda rotary never existed
except for the APEX SEAL, and that was solved over 20 years ago. As
for the rotary's fragility, do the world a favor before you start making
ridiculous statements as you have above and go to the junk yard and buy
a Mazda rotary engine and ANY small block six or eight cylinder engine.
Dismantle both and specifically note the parts count. The more parts you
have the more that are available to break! Place the crankshaft from the
small block beside the rotary's e-shaft. Picture each one supported only
at the ends and a small car dangling from a cable fastened around the
middle.
Now if your life depended on it, as it does in aviation, which structure
would you prefer to have holding that car over your head. Go read
Mr Yamamoto's book, if you have already read it, then read it again
until you understand it. You do indeed still have a lot to learn. Dave M
im not here to start a fight, i apologise for my rash statements and i wish
to retract them. thank you.
han nguyen
Perhaps you did not understand the meaning of the word "grenade". The term was
invented to describe the catastrophic failure of a piston engine. The typical
"grenade" scenario of a piston engine is when the connecting rod breaks
and the block is "windowed". Sometimes the crankshaft breaks with a similar
result. In an aircraft piston engine sometimes the cylinder head is blown off
and comes through the side of the cowl. In some cases the entire cylinder
separates from the crank case. The more wide spread failure is a cracked
head or block. Crankshafts can be a mass of crack at the mandatory overhaul
time requiring replacement. It happened on my Cont. O-470. You can count on
replacing exhaust valves on a regular basis.
That never happens in a Wankel engine. The E-shaft never breaks or cracks
nor does the rotor ever come out of the block. The Mazda Wankel engine will
generate over a 1000 hp burning alcohol and NOS with a engine block that
weighs less than 200 pounds. You will not find that power to weight ratio
in any piston engine. I would hardly call the Mazda Wankel engine fragile.
What does happen in turbo charged Wankel engines is detonation sometimes
causes the cast iron apex seals to fracture scoring the rotor housings.
Particularly the 3rd gen turbo RX7's. They had a 3 piece apex seal
which has now been replaced by a much more durable 2 piece apex seal.
Read
http://www.rotaryeng.net/history.html for a history of
the apex seal.
There is an answer to this and that is use thicker 3 mm steel seals instead
of 2 mm iron seals. The down side is more wear on the rotor housings.
Detonation is not something that happens in normally aspirated Wankel
engines. Seal life can be as much as 400,000 miles. I have owned
six rotary powered cars starting in 1973 two of which have had over
300,000 miles. The engines were still running fine when I sold them.
The rest of the car will turn into a rusted hulk long before the engine
dies. However one must not let the engine over heat
or run out of lubricating oil both for the apex seals and the
bearings. You must also keep the air filter in good shape and not
allow objects to enter the engine intake system.
Well over 2 million 200 thousand Mazda rotary engines have been sold.
200,000 of that in RX8's alone.
Paul Lamar
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