From: "Tracy Crook rwstracy@gmail.com" <flyrotary@lancaironline.net>
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Date: Wed, 4 Sep 2019 08:24:06 -0600
Subject: Re: [FlyRotary] Re: The ultimate question...
Message-Id: <6324C428-B16B-4381-BE24-69B847B17C9A@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

I found the BSFC 'sweet spot' to be at 5000 - 5200 rpm.  No surprise, all th=
e old Mazda technical papers showed the same thing.  Still, it looks like ma=
ybe .45 - .47 lb/hp/hr.   In the big picture it don=E2=80=99t really matter.=
  Fuel turns out to be the least expensive thing for most of us.  Time in th=
e air is more important : )


Still fixing the RV8 in CO. =20

Sent from my iPad

> On Sep 4, 2019, at 01:00, Kent Bedford kbedford@alphalink.com.au <flyrotar=
y@lancaironline.net> wrote:
>=20
> Was just talking to the engine builder and the answer to one question also=
 answered another -
>=20
> The reason that the engine will have two turbos is that they are set up se=
quentially - the first one operates as a turbo normaliser to 500 rpm above c=
ruise rpm.  Once the throttle is opened past that point for takeoff/climbout=
 the second turbo kicks in to more power.
>=20
> That also explains the fuel efficiency at cruise - only a small turbo is o=
perating to provide turbo normalisation.  Hope this makes sense!
>=20
>=20
>=20
>> On 4/09/2019 11:21 am, Kent Bedford kbedford@alphalink.com.au wrote:
>> Kind of strange how it worked out, but when we made a small change to the=
 design that gave a tangible benefit we suddenly found ourselves with room f=
or an extra 40 gallons on top of what we already had - 90 gallons should be e=
nough for range to be governed by bladder size instead of fuel tank size.
>>=20
>>> On 4/09/2019 6:08 am, Charlie England ceengland7@gmail.com wrote:
>>>> On 9/3/2019 2:31 AM, Kent Bedford kbedford@alphalink.com.au wrote:
>>>> ...if someone has an about 450hp four rotor + turbo engine with effecti=
ve cooling, and resolves the torsional vibration and resonance issues (which=
 will partly be resolved by having four rotors anyway), are there any other f=
oreseeable likely or possible issues that may need to be overcome to success=
fully operate it with a good 500hp-rated PSRU like a Ballistic or similar?
>>>>=20
>>> Figuring out where to put the fuel, unless you're talking about a time-t=
o-climb record attempt or Reno racer. Any usable a/c at that power level may=
 require your own refinery.
>>> Charlie
>>>=20
>>>=20
>>> ---
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>>>=20
>>>=20
>>> --=20
>>> Homepage:  http://www.flyrotary.com/
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>>=20
>>=20
>> --=20
>> Homepage:  http://www.flyrotary.com/
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html
>>=20
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>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
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