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----- Original Message -----
Sent: Friday, January 02, 2009 5:47 PM
Subject: Re: [FlyRotary] Re: engine progress
Yeah Steve, gotta' big Garrett hair blower
there. I will try again with the photos.
Greg
----- Original Message -----
Sent: Friday, January 02, 2009 5:15
PM
Subject: Re: [FlyRotary] Re: engine
progress
Greg,
The pictures came over real small but do I see a turbo hanging under
there? I am building a Renesis with a turbo for my 360.
Steve Veach
On Jan 2, 2009, at 4:09 PM, Greg Ward wrote:
O.K., let's try this.....they are all less than
40K
Greg
----- Original Message -----
Sent: Friday, January 02, 2009 1:26
PM
Subject: [FlyRotary] Re:
Activity......
Greg,
it could be the size of your jpegs attachments … reduce size to about 40k
or less 2-3 total photos.
JWW
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Greg
Ward
Sent: Friday,
January 02, 2009 4:25 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re:
Activity......
Anybody have any idea why I get bounced when I try
to attach and download some engine progress
pictures???
----- Original
Message -----
Sent: Friday, January 02, 2009 10:59
AM
Subject: [FlyRotary] Re:
Activity......
The
4 port Renesis does have the high speed barrel valve. Don't recall
the distance from memory but just a guess is considerably less than the
18" Dennis got. That must have been the distance to the low
speed chamber in the nylon portion of the
manifold.
Tracy
Dennis,
I'll
try and give you a more "detailed" review of you analysis and approach
in a short while (I have to dig up a drawing of the Renesis 4 port
intake to look at). However, I seem to recall that there is a
valve in the air passages of the intake that rotates open or closed
depending of some engine load variables. IF my memory is correct,
this value in effect halves (or doubles depending on which runner you
are using for reference) the distance the pulse has to travel from port
of one rotor to port of the second rotor. At the right rpm range
the value closes forcing the pulse to travel the shorter distance (or
else it opens at the lower RPM range to make the pulse travel a longer
circuit – or vice versa – I have to look and see if the Renesis even has
such a valve – the older N/A 13Bs did have the value in order to change
the effective length of the intake runners.
I
can not tell from my hasty look at your e mails whether you took that
factor (the valve changing the effective length of the runner)
into consideration or indeed, if the Renesis even has one.
?
Will
get back to you shortly
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Dennis
Haverlah
Sent: Thursday, January 01, 2009
11:59 AM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re:
Activity......
OK - I'll try to stirrup some reflective comment on
the list.
I'm in the middle of trying to design a new intake for
my RX-8 Renesis powered RV-7A
I've been reading the tuned intake
discussion posts from 2004 and 2005. FAW theory etc. I've
tried
to apply the
theories to the Mazda RX-8 4 port intake to see how it works and
make sure it
agreed
with the theories. No Luck!!?
My measurements of the
cast aluminum intake show primary runners are 12.5 in. long + 2.5 inch
to the center of the chamber
where the intake runners
from rotor 1 interact with rotor 2's intake runners. Add 3 inches
at the other end ( engine flange) for the distance from the
manifold flange to the
center of the intake at the rotor face and the total intake is 18.0
inches. The secondaries are 1/2 inch longer at 18.5
inches.
It
appears they are using the FAW wave created as Rotor #1 intake opens to
travel through the intake tubes to Rotor #2. Total distance
from rotor
#1 to rotor
#2 is 36 in. for primary runners and 37 in. for secondary
runners.
Ed's post of Aug. 26,04 indicated a "E" shaft rotation
of 93 deg. between Rotor #1 opening and Rotor #2 closing. I
measured the angle on an old engine and agree.
The pulse from rotor #1
needs some opening to exit and at rotor #2 you must have some opening to
enter the rotor. I'll guess this is a total of 10 deg. Hence
we have about 83 deg of "E" shaft rotation time for the pulse to
travel from rotor #1 to rotor #2.
I want to design my intake for
max. HP at 6750 rpm. 6750/60 = 112.5 rps; 1/112.5 =
0.008888rev/sec or for 360 deg rotation of the "E" shaft it takes
8.888ms.
The time for 83 deg of "E" shaft rotation would be
8.888ms*83deg/360deg = 2.05ms. (the time available for the pulse to
travel from rotor #1 to #2.)
speed of sound = 1100fps or 1.1f/ms*12 =
13.2 in/ms. So 13.2in/ms * 2.05 ms = 26.4 inch from rotor #1
to #2. My problem is this is already 5 in./ intake shorter than the RX-8 4 port
intake. If I assume their intake is designed for 8500 rpm the
calculation indicates a runner length of 21.3 inches is needed between rotor
31 and #2. I measured
the RX-8 cast al. intake to be 18 in * 2 = 36 in
.
To me it appears I do not understand how the RX-8 intake
really works!! Anyone have any ideas or find an error with the
logic?
Going FAW crazy!!
Dennis
H.
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