From: "Marc Wiese cardmarc@charter.net" <flyrotary@lancaironline.net>
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To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: The ultimate question...
Date: Wed, 4 Sep 2019 15:08:30 -0500
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That does not sound to me like a suitable aircraft configuration.=20
A single turbo would suffice, the controller/wastegate would dial in the =
boost needed to maintain SL pressure in the manifold at any condition, =
there isn't a reason to 'overboost' the engine. Too complicated and =
unnecessary-especially all the hot turbo piping could get very messy.
Is the engine builder using ceramic rotor tip seals? Good idea for =
boosted engines.
MW

-----Original Message-----
From: Rotary motors in aircraft=20
Sent: Wednesday, September 04, 2019 2:00 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: The ultimate question...

Was just talking to the engine builder and the answer to one question =
also answered another -

The reason that the engine will have two turbos is that they are set up =
sequentially - the first one operates as a turbo normaliser to 500 rpm =
above cruise rpm.  Once the throttle is opened past that point for =
takeoff/climbout the second turbo kicks in to more power.

That also explains the fuel efficiency at cruise - only a small turbo is =
operating to provide turbo normalisation.  Hope this makes sense!


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=20
> the design that gave a tangible benefit we suddenly found ourselves=20
> with room for an extra 40 gallons on top of what we already had - 90=20
> gallons should be enough for range to be governed by bladder size=20
> instead of fuel tank size.
>
> 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=20
>>> effective cooling, and resolves the torsional vibration and=20
>>> resonance issues (which will partly be resolved by having four=20
>>> rotors anyway), are there any other foreseeable likely or possible=20
>>> issues that may need to be overcome to successfully operate it with=20
>>> a good 500hp-rated PSRU like a Ballistic or similar?
>>>
>> Figuring out where to put the fuel, unless you're talking about a=20
>> time-to-climb record attempt or Reno racer. Any usable a/c at that=20
>> power level may require your own refinery.
>> Charlie
>>
>>
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