X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from an-out-0708.google.com ([209.85.132.240] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2952877 for flyrotary@lancaironline.net; Wed, 04 Jun 2008 09:24:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.132.240; envelope-from=rwstracy@gmail.com Received: by an-out-0708.google.com with SMTP id b38so17319ana.81 for ; Wed, 04 Jun 2008 06:23:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender :to:subject:in-reply-to:mime-version:content-type:references :x-google-sender-auth; bh=MRYAE1CmvLIWCtczskjMSpyILi3AZgGP26bbck4XpRs=; b=D8tge4RlqH1gzRrRYY9hquHCe3RpFrqebA7etq+z3atFX+RZX9yrxDTyUY3n0Lr+wn OrCS/IOfQZ9/3gCam6yvjK1b0mhcGMDUhpsvwjju+ULdOl2OIoMN3eGIqjbT+tGfRs6U RwKEuekQhSXLrAaJF7Ea5hMxpd5qkZz1GNBek= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:in-reply-to:mime-version :content-type:references:x-google-sender-auth; b=AFHgGU77G4Ubm1zmhnD64N3+v6e2JQrN1g7ol//SmB2+dIByimlxtaWIO/qvJ7yqPS dPxZxeYzwMTcs7oVFe9iT0tIVagmFoD9PUHDovQYP+WnuqFC5eediQwMpsXt3qb4mU75 BKfIujkcmYOuAC4lEfWOWSHvmZpvZzoSkrAAM= Received: by 10.100.93.19 with SMTP id q19mr20056194anb.139.1212585812607; Wed, 04 Jun 2008 06:23:32 -0700 (PDT) Received: by 10.100.167.19 with HTTP; Wed, 4 Jun 2008 06:23:31 -0700 (PDT) Message-ID: <1b4b137c0806040623v2d4c38dfn673f49d9da98ffb5@mail.gmail.com> Date: Wed, 4 Jun 2008 09:23:31 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] combined starter alternator In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_9355_9390317.1212585812597" References: X-Google-Sender-Auth: 71c62739957d4a5e ------=_Part_9355_9390317.1212585812597 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline My early 60s Suzuki 150 motorcycle had such a setup. All your points are valid but are probably beyond realization not due to technical reasons but financial. If you could spread the development costs over a million units it could happen. Factoid : during the last 55 years, 30,000 experimental aircraft (U.S.) have been registered. Perhaps 1 % of them had alternative engines. If you wanted to do it yourself, you have only one place to start looking - Hybrid car drivetrains. Tracy On Tue, Jun 3, 2008 at 6:28 PM, George Lendich wrote: > Directed to the electronic wiz types. > > This is not a development issue but an educational issue as I would like > to understand the issues associated with developing a starter alternator. > > Personally I believe a combined starter, alternator, flywheel, damper, > timing wheel and pick up would be a great advantage (we live to dream). > Some systems use the combined starter alternator attached to the gear box > shaft just, between the motor and the gearbox fluid damper. > > I believe from talking to Bill Jepson that getting sufficient power from > the current winding used is problematic but that there had been major > improvements in this field. Also reading a little on the Internet ( if I > understand it correctly) an alternator is AC ( alternating current) and a > generator is DC. As Batteries are DC and starters are DC, we would need to > use a DC generator winding in the starter generator (someone tell if I'm > wrong here). > > Of course nothing is as simple as this, so I'm keen to understand the > issues associated - from anyone out there in the electronics world!? > George (down under). > ------=_Part_9355_9390317.1212585812597 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
My early 60s Suzuki 150 motorcycle had such a setup.
 
All your points are valid but are probably beyond realization not due to technical reasons but financial.  If you could spread the development costs over a million units it could happen. 
 
 Factoid :  during the last 55 years, 30,000 experimental aircraft (U.S.)  have been registered.   Perhaps 1 % of them had alternative engines.
 
If you wanted to do it yourself, you have only one place to start looking - Hybrid car drivetrains.
 
Tracy


 
On Tue, Jun 3, 2008 at 6:28 PM, George Lendich <lendich@optusnet.com.au> wrote:
Directed to the electronic wiz types.
 
This is not a development issue but an educational issue as I would like to understand the issues associated with developing a starter alternator.
 
Personally I believe a combined starter, alternator, flywheel, damper, timing wheel and pick up would be a great advantage (we live to dream).
Some systems use the combined starter alternator attached to the gear box shaft just, between the motor and the gearbox fluid damper. 
 
I believe from talking to Bill Jepson that getting sufficient power from the current winding used is problematic but that there had been major improvements in this field. Also reading a little on the Internet ( if I understand it correctly) an alternator is AC ( alternating current) and a generator is DC. As Batteries are DC and starters are DC, we would need to use a DC generator winding in the starter generator (someone tell if I'm wrong here).
 
Of course nothing is as simple as this, so I'm keen to understand the issues associated - from anyone out there in the electronics world!?
George (down under).

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