From: "James R. Osborn" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.192.174; envelope-from=rxcited@gmail.com
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1990.1\))
Subject: Re: [FlyRotary] Rotary Design Change
In-Reply-To: <list-7260626@logan.com>
Date: Fri, 7 Nov 2014 15:11:05 -0800
Content-Transfer-Encoding: quoted-printable
Message-Id: <3BD081F5-E450-4D6D-AB68-3C94615D269D@gmail.com>
References: <list-7260626@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


I think the consensus has been that this is pure malarky.

#1 - his explanation suggests that the intake chamber is at higher =
pressure than the exhaust chamber.  Obviously the opposite is true, so =
air fuel mixture is never going to cross over the spark plug hole into =
the exhaust chamber.  Exhaust gases crossing over into the intake =
chamber probably isn=E2=80=99t helpful, but restricting the size the =
spark plug hole would be more detrimental to proper ignition, so his =
linear plug hole doesn=E2=80=99t solve anything.

#2 - there is no torque being generated at top dead center so the =
pressure across the rotor face argument is misguided.  Changing position =
of the compression pocket would not have the effect he is describing.  =
Mazda tested offset compression pockets and it did not help anything.

Its actually a lot more exciting to read the SAE papers about the =
Renesis improvements which actually were quite helpful in reducing =
emissions and improving efficiency.  They virtually eliminated cross =
talk between exhaust and intake ports.

Or talk about the 16X engine - the version they are still playing around =
with in Japan.  It has higher displacement (1.6 liter versus 1.3 liter =
13B) with a narrower rotor width, larger rotor diameter and larger =
eccentric offset.  These changes cause an improvement in thermal =
efficiency (better surface to volume ratio than the 13B) and better low =
end torque properties.  They have had great success with this engine in =
their direct injection hydrogen testing - air is drawn into the intake =
chamber and after the apex closes off the chamber, the required fuel is =
squirted directly into the chamber.

I am disappointed in the news over the last year or so that the rumored =
new Rx-7 has been shelved for now.  If they came out with a 16X Rx-7 =
right now, I would buy one immediately.

> On Nov 7, 2014, at 12:22 PM, Luciano, Luis I CIV PEOSUB, PMS404P =
<flyrotary@lancaironline.net> wrote:
>=20
> Friends,
>=20
> I may be late to the discussion but I recently saw an interview in =
YouTube which spoke of design improvements to the rotary engine.  I =
wanted to ask the collective  opinion on the feasibility of making this =
modification.  It talks about preventing some compression loss (and =
wasted fuel) from the apex going over the spark plug hole as well as =
offsetting the ignition chamber on the rotor (see link below).
>=20
> http://www.youtube.com/watch?v=3Dm3pCLjHZmhM
>=20
> Regards,
>=20
> Luis Luciano
> Velocity XL-5 "Dulcinea"