X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4367094 for flyrotary@lancaironline.net; Tue, 22 Jun 2010 17:36:05 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id 8583417352B for ; Wed, 23 Jun 2010 05:35:26 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 98D56BEC002 for ; Wed, 23 Jun 2010 05:35:25 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Peripheral Port 13B Rotary Engine Date: Wed, 23 Jun 2010 07:35:34 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01CB12A6.AA51F4C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 X-Antivirus: avast! (VPS 100622-1, 06/22/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0010_01CB12A6.AA51F4C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Richard, I didn't realize it was a slide carbie, however what = about the 38mm carbie. I'm trying to understand why you couldn't get the = full range with that carb and felt it may be a restriction like a = venturi. I can see why a larger carbie feeding a smaller ( 38mm) runner would be = the best mix for best velocity. George ( down under) ----- Original Message -----=20 From: Richard Sohn=20 To: Rotary motors in aircraft=20 Sent: Wednesday, June 23, 2010 3:42 AM Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine The Mikuni VM series, as most any slide throttle carbs do not have a = venture throat. The throat size changes with the slide setting. Mixture = is maintained with different components at different slide opening. = These are, idle jet-needle with jet-main jet. Also, the shape of the = slide opening is contributing to throttle response. See Mikuni web sites for details. Complicated function with simple mechanics. Richard Sohn N2071U ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Tuesday, June 22, 2010 4:00 AM Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine Thanks Richard, That's interesting! Did you have a choke or reduction in throat size = in the 38mm carbie, and does the Mikuni have a venturi throat George (down under) George, I had focused on the 38mm and was doing pretty good with it, until = I realized I could not maintain a good mixture over the whole operating = range. Obviously, that is why the specification says it is good for up = to 65hp.=20 Even so the carb is 44mm now, my intake runner is still 38mm = maintaining the intake tuning. Richard Sohn N2071U ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Monday, June 21, 2010 4:59 PM Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine Richard, Ah The magic 44mm. I know you are running a 12A but at what = rpm are you running out of breathing, provided you have had the single = that high. I would have to run the numbers but thought you would get = away with a 38/40mm carb and push up the velocity.=20 George (down under), this flywheel is my design, it is steel with the cut outs for = balancing. The steel section is 14mm thick, and the ring gear is 250mm = diameter, coming off a Metro Geo engine.=20 I calculated my hp from fuel flow using a BFSC of .5 . May be = a little optimistic. Mixture was slightly rich at the tests.=20 I am running now a Mikuni VM44 carb. Richard Sohn N2071U ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Monday, June 21, 2010 3:39 AM Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine Richard,=20 We seem to be singing from the same sheet of music in regard = to projected HP at RPM, at optimum performance. So what weight have you = got on that flywheel, it seems to be a cut down manual cast flywheel = from a past photo. I figured I might need a heavier flywheel than the = flexplate and was considering having one of those aftermarket steel ones = made and have mounting holes included to suite what ever damper I = incorporate. BTW this is single rotor specific if anyone was confused. George (down under) Is anyone flying with a Mazda 13B peripheral port engine? = If so, how is it working? Can you describe the advantages and = disadvantages? =20 Thanks, =20 Bob Rogers ------=_NextPart_000_0010_01CB12A6.AA51F4C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks Richard, I didn't realize it was = a slide=20 carbie, however what about the 38mm carbie. I'm trying to understand why = you=20 couldn't get the full range with that carb and felt it may be a = restriction like=20 a venturi.
I can see why a larger carbie feeding a = smaller (=20 38mm) runner would be the best mix for best velocity.
George ( down under)
----- Original Message -----
From:=20 Richard=20 Sohn
Sent: Wednesday, June 23, 2010 = 3:42=20 AM
Subject: [FlyRotary] Re: = Peripheral Port=20 13B Rotary Engine

The Mikuni VM series, as most any = slide=20 throttle carbs do not have a venture throat. The throat size = changes with=20 the slide setting. Mixture is maintained with different components at=20 different slide opening. These are, idle jet-needle with jet-main jet. = Also,=20 the shape of the slide opening is contributing to throttle=20 response.
See Mikuni web sites for = details.
 
Complicated function with simple=20 mechanics.
 
Richard Sohn
N2071U
 
----- Original Message -----
From:=20 George=20 Lendich
To: Rotary motors in = aircraft=20
Sent: Tuesday, June 22, 2010 = 4:00=20 AM
Subject: [FlyRotary] Re: = Peripheral=20 Port 13B Rotary Engine

 Thanks Richard,
That's interesting! Did you have a = choke or=20 reduction in throat size in the 38mm carbie, and does the = Mikuni have a=20 venturi throat
George (down = under)
George,
 
I had focused on the 38mm and was = doing=20 pretty good with it, until I realized I could not maintain a good = mixture=20 over the whole operating range. Obviously, that is why the = specification=20 says it is good for up to 65hp.
Even so the=20 carb is 44mm now, my intake runner is still 38mm maintaining the = intake=20 tuning.
 
Richard = Sohn
N2071U
----- Original Message ----- =
From:=20 George=20 Lendich
To: Rotary motors in = aircraft=20
Sent: Monday, June 21, = 2010 4:59=20 PM
Subject: [FlyRotary] Re: = Peripheral=20 Port 13B Rotary Engine

 
Richard,
Ah The magic 44mm. I know you = are=20 running a 12A but at what rpm are you running out of = breathing,=20 provided you have had the single that high. I would have = to run=20 the numbers but thought you would get away with a 38/40mm carb = and=20 push up the velocity. 
George (down = under),
 
this flywheel is my design, = it is steel=20 with the cut outs for balancing. The steel section is 14mm = thick, and=20 the ring gear is 250mm diameter, coming off a Metro Geo = engine.=20
I calculated my hp from fuel = flow using a=20 BFSC of .5 . May be a little optimistic. Mixture was slightly = rich at=20 the tests.
I am running now a Mikuni = VM44=20 carb.
 
Richard Sohn
N2071U
 
 
----- Original Message ----- =
From:=20 George Lendich =
To: Rotary motors in = aircraft
Sent: Monday, June = 21, 2010=20 3:39 AM
Subject: [FlyRotary] = Re:=20 Peripheral Port 13B Rotary Engine

 Richard, =
We seem to be singing from = the same=20 sheet of music in regard to projected HP at RPM, at optimum=20 performance. So what weight have you got on that flywheel, = it seems=20 to be a cut down manual cast flywheel from a past photo. I = figured I=20 might need a heavier flywheel than the flexplate and was = considering=20 having one of those aftermarket steel ones made and have = mounting=20 holes included to suite what ever damper I = incorporate.
BTW this is single rotor = specific if=20 anyone was confused.
George (down = under)
Is anyone=20 flying with a Mazda 13B peripheral port engine?  If so, how is it = working?  = Can you=20 describe the advantages and=20 disadvantages?

 

Thanks,

 

Bob=20 = Rogers

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