X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "Charlie England ceengland7@gmail.com" Received: from mail-io1-f48.google.com ([209.85.166.48] verified) by logan.com (CommuniGate Pro SMTP 6.3.5) with ESMTPS id 208999 for flyrotary@lancaironline.net; Sun, 15 Aug 2021 12:32:03 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.166.48; envelope-from=ceengland7@gmail.com Received: by mail-io1-f48.google.com with SMTP id a15so1390536iot.2 for ; Sun, 15 Aug 2021 09:32:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=jLID1ii3PhT77pJoy41NEpt9tzOeXBpTN89N04NqjLc=; b=bts7UouBn3HzimX87hDK9QW8QaUQMSzDLFRxoQHnM3cDE2NJjjRz7fgi9oD4TXqHgD VQRC4QvfA5w1vlfG5dO0G82dwXkD2aS/9DtUYFFMak9bIx8VHBj40kBdBx8J47zile8o uHax6/D21b0zb/Os7M5v3L0CTmKGLwIEM1pApuGs2vPXZGE4sdmVswCId2/lWsIAnIRo VzA/Z2wy4YMLtZAY3XilEArEsQ06zEz4Xx2tCZodHBKfmRJ/NLjMZox5ii92x/qLtxty FWDPhX0baazQT2cFy6BI+IvMFOskgW0Z2Iypx1VTMXPRWAi+XiD+jJabRPDVj2//28WX MsOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=jLID1ii3PhT77pJoy41NEpt9tzOeXBpTN89N04NqjLc=; b=uRTEdqdB6SrmzrVOPMlx5LuqaR+dTVb1jrfgq0mxcDDQQ8IOvFAl5YbYOwLPpVs9FZ XKDD5zJ+dIrg24mWGzGAwIWiDDJayiNU6DM4xR4qTq9zdMq45L3JGM/TgJFIGHJw4EyB KpV5059MPXM3d2wo9gcxgOt9zlpvkHF17LWYs91FaYERoYJVlMgfLVH27OWr8nCCqhdH Hgg6/b0RJrp2qf+FZltOoZn7ZIndSaaUFdcadAfKkqrU3AdxJKMDG4/5/k+Z2zBtiB8I lo3mMyicFbL1yQBAlgzbWPf0Mq7nwQ6KfaY4jQHJuMmz+cLOU/uSGv0YUAmTFExTLaE5 nYaw== X-Gm-Message-State: AOAM5325CammbNWUAY7IC9p7S4ULlWqpuut0qAhaEUoQHNEuJnk/ynrK EF3fbuwh7l+b7Jd/9OyMmwuyICORMcs7lyB5EGeQXg/1MfY= X-Google-Smtp-Source: ABdhPJxI9mE46iGSD1+sFXNaKxRWTtOu/vtJPlDg3X7YmxdHgayYZjF4nkLKU6oFTY5TejFKoEJ2ZQrOwk9eblXbnX4= X-Received: by 2002:a5e:c00a:: with SMTP id u10mr6665789iol.60.1629045106697; Sun, 15 Aug 2021 09:31:46 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sun, 15 Aug 2021 11:26:10 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Interesting "Twin Pack" Rotary Demo Idea To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000e8665305c99b9e61" --000000000000e8665305c99b9e61 Content-Type: text/plain; charset="UTF-8" I read through the thread on VAF; his motivation is to have totally redundant propulsion, without any of the various issues arising from L/R or F/R props. I dismissed his idea as being way too heavy for a single engine a/c. I totally missed the idea of splitting the engine into a pair of single rotors.I'll bet Richard can confirm that a 1-rotor can't come anywhere near half the weight of a 2-rotor, even with aluminum end plates, and you haven't yet doubled the starter, alternator, controller, etc weights. Someone in South America did the concentric prop thing on an EZ about 15-20 years ago using small piston engines, and even flew it to OSH. So it obviously can be done, but I don't see a 1-rotor engine as being a viable path. Shame there aren't more of the smaller 2-rotor engines around to play with. Virus-free. www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Sun, Aug 15, 2021 at 11:16 AM RES res12@fairpoint.net < flyrotary@lancaironline.net> wrote: > Ernest, you pretty much said it all. > > Let me just add a few thing. > > Since you have pretty much everything double, so are possible failure > sources. > > Why counter rotating propellers? Is there a power density issue? > > Would have to spend millions and millions to getting that into the air. > > I have been there done that at a much simpler scale, with just one rotor, > all the way to safely fly it in my 700lb airplane. > > > > There is a lot more to it! > > > > > > Sent from Mail for > Windows > > > > *From: *RV9flyer 13B Rotary rv9flyer13b@gmail.com > > *Sent: *Sunday, August 15, 2021 8:10 AM > *To: *Rotary motors in aircraft > *Subject: *[FlyRotary] Interesting "Twin Pack" Rotary Demo Idea > > > > An aero-engineer on the VANS Alternative Engine list posted his dream > project on creating a Twin Pack single rotor to put in an RV-8. Some very > creative thinking to bring it along this far IMO! > > > > Doug > > > > > > https://www.youtube.com/watch?v=kMxJ7G-lRhk > > > > > > > --000000000000e8665305c99b9e61 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I r= ead through the=C2=A0thread on VAF; his motivation is to have totally redun= dant propulsion, without any of the various issues arising from L/R or F/R = props. I dismissed his idea as being way too heavy for a single engine a/c.= I totally missed the idea of splitting the engine into a pair of single ro= tors.I'll bet Richard can confirm that a 1-rotor can't come anywher= e near half the weight of a 2-rotor, even with aluminum end plates, and you= haven't yet doubled the starter, alternator, controller, etc weights.<= /div>

Someone in South America = did the concentric prop thing on an EZ about 15-20 years ago using small pi= ston engines, and even flew it to OSH. So it obviously can be done, but I d= on't see a 1-rotor engine as being a viable path. Shame there aren'= t more of the smaller 2-rotor engines around to play with.

3D"" Virus-free. www.avast.com

On Sun, Aug 15, 2021 at 11:16 AM RES res12@fairpoint.net <flyrotary@lancaironline.net> wrote:

Ernest, you pretty much said it all.

Let me just add a few thing.

Sinc= e you have pretty much everything double, so are possible failure sources. =

Why counter rotating propellers? Is there a powe= r density issue?

Would have to spend millions an= d millions to getting that into the air.

I have = been there done that at a much simpler scale, with just one rotor, all the = way to safely fly it in my 700lb airplane.

=C2=A0

There is a lot more to it!

=C2=A0

= =C2=A0

Sent from Mail for Windows<= /p>

=C2=A0

From: RV9flyer 13B Rotary rv9flyer13b@gmail.com
Sent: S= unday, August 15, 2021 8:10 AM
To: Rotary motors in aircraft
Subj= ect: [FlyRotary] Interesting "Twin Pack" Rotary Demo Idea

=

=C2=A0

An aero-engineer on the VANS Alternative Engine list posted his dream= project on creating a Twin Pack single rotor to put in an RV-8.=C2=A0 Some= very creative thinking to bring it along this far IMO! =C2=A0

=C2=A0

<= p class=3D"MsoNormal">Doug=C2=A0

=C2=A0

= =C2=A0

https://www.youtube.com/watc= h?v=3DkMxJ7G-lRhk

= =C2=A0

=C2=A0

=C2=A0

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