Dear Mr Lamar,
My name is Pierre Terblanche and I am a product / automotive designer.
First can I say that the Chaparral cars were some of the objects of
wonder of my youth.
I am working on a Wankel engined project in my spare time (A hobby...)
as I have always been a fan of the rotary engine. When I was in college
in South Africa in the early 70s my
roommate raced a Mazda RX2 in production racing.These cars were
extremely fast and bulletproof.
I had forgotten about the Wankel until I saw a small go-kart engine at
the Birmingham race car show. After years of working with four stroke
engined bikes the motor appealed to me as it is lightweight, compact,
vibrationless. ( 52ps x 16kg.)
It is clear to me that there are issues with the engine as far as
emissions and noise
is concerned but for a track day bike this will not be an issue.
I found an article on the Internet about a conceptual exhaust system for
Wankel engines which you have designed.This was the one with the
cylindrical drum main body. Based on Russian research..?
Would it be possible for you to let me have some more information as to
the potential advantages of such a system. ( Compact light weight
etc....? )
Yours Truly,
Pierre Terblanche.
I purchased your book "How to Cool Your Wankel" when I was in the USA
recently.There are some very interesting practical ideas in there. Thank
you very much.
---------------------------------------------------------
Thanks you for your interest and complements.
I think this is the muffler you are speaking of.
Weight is going to depend on what you make it out of and how long
you want it to last and or the duty cycle.
For a continuous duty aircraft engine some parts of it will have to be
made
from
.035" thick Inconel to keep the weight down. The rotary exhaust runs
up to 1800 F on all peripheral exhaust port engines. The RX8 engine
has side exhaust ports and they are about 200 F cooler.
--
Paul Lamar ...No rotor no motor.
Paul,
Does that thing work? It would fit well on a helicopter, especially on
a
vertical installation. Does it work better than a turbocharger?
Steve Brazil
In theory it does but so far as I know nobody has built one yet.
It is cheaper and easier in a plane to just use two pipes 32 inches
long and a collector. Probably would pay off in a pusher configuration.
--
Paul Lamar ...No rotor no motor.
How much to build one? Who is competant to build it? I have a project
coming up (pusher) with a single rotor that will need an effective
compact
exhaust system. If I don't have to sell a kid, I might be willing to
fund
a
prototype.
best,
George W.
The muffler on my one rotor in the picture is very effective and simple.
Header is 1.5" going tangentially into the 4" expander and the aoutlet is
1". I will probabely go to 5" with the expander in the flying version, it
is
now 4" because it was available. The whole system is empty.
The two factors making this exhaust work are, the expansion with the
assosiated adiabatic cooling, and matching of the tail pipe size.
Standing next to the engine as in the picture, without any ear mufflers is
no problem, even for a prolonged period of time.
If anyone has a standardized measuring method, I would be interested to
take
db measurements.
Richard Sohn
N2071U
Lets talk, Richard. What does your exhaust system weigh?
George W
Paul,
What does the inside of that muffler look like? Is it packed with
something? Would it work with the 20B? I'm thinking about the 13B right
now and that muffler looks like it would package very well for me.
Steve
Can't put anything in there. Every time we do it pukes it out the
exhaust pipe in little pieces.
BTW I was in Valdez Alaska running my
C182 O-470 up on the ramp and a pax was standing near by. He freaked
out when some muffler guts were spewed out on the ramp. I then got the
impression he was a bit frightened to fly with me. I told him not
to worry. The engine did not really need those parts :)
Paul Lamar ...No rotor no motor.
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