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From: "George Lendich" <lendich@aanet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-4243777@logan.com>
Subject: Re: [FlyRotary] Re: Ejector cooling
Date: Sun, 2 May 2010 08:18:52 +1000
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Joe,
9" Dia seems big, be careful as to not create a +ve pressure in the cowl, I 
would isolate the Rads from the cowl area with appropriate ducting. Please 
keep us informed on how it works out for you.
George (down under)

> Hi,
>
> I have built my engine installation around an exhaust augmenter.  It is 
> 24"
> long and started it's live as a 9"dia stove pipe.  It runs the length of 
> the
> cowl and discharges aways from the prop ( pusher)  I will route the 
> headers
> forward then up near where the old oil injector pump used to be.  I plan 
> to
> us a Spin tech muffler and route that into the augmenter.  The augmenter 
> is
> built into the cowl and is removable.  Air comes in a F16 5' long scoop 
> and
> flows through the rad and oil cooler and dumps into the cowling.  The only
> way out is the augmenter tube.  I may have to build a plenum that  directs
> the air behind the rad and oil cooler directly into the augmenter.  This
> arangement  causes the alternator and water pump to be mounted on the left
> side of the motor and down  almost on top of the radiator.  Radiator is
> lying flat below and forward of the motor. The intake and injection stuff
> fills up the right side of the cowl and wing root area.  I really envy the
> RV side by side and Cozy MkIV guys, they have lots of room .
>
>
> Joe Berki
> Limo EZ
> ----- Original Message ----- 
> From: "Bill Bradburry" <bbradburry@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Saturday, May 01, 2010 9:49 AM
> Subject: [FlyRotary] Re: Ejector cooling
>
>
>> Marc,
>> Could you get some drawings and put them on the list?  I think a lot of
>> folks would like to see how it would look and might try it.
>>
>> Bill B
>>
>> -----Original Message-----
>> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
>> Behalf Of Marc de Piolenc
>> Sent: Saturday, May 01, 2010 7:24 AM
>> To: Rotary motors in aircraft
>> Subject: [FlyRotary] Ejector cooling
>>
>> Mike Wills wrote the quoted passages:
>>
>> "1) It adds measurable weight."
>>
>> Compared with what? What if a small addition of weight solves your
>> cooling problems and reduces cooling drag. Would you refuse to do it?
>>
>> "2) It adds complexity."
>>
>> How complex can a device with no moving parts be?
>>
>> "3) It adds noise (that alone in hindsight makes me glad I didn't do it
>> - god knows I don't need more noise)."
>>
>> No. Mixer-ejectors are used for noise REDUCTION. Successfully.
>>
>> "4) And finally, not a single person I spoke with noticed a measurable
>> improvement in either cooling performance or drag reduction after adding
>> an augmentor, or noticed a measurable reduction after eliminating the
>> augmentor."
>>
>> You seem to have consulted a very select group. In volume 2 of
>> Alternative Engines, page 139 et seq, Charles Airesman Jr. documents his
>> experiments with a very primitive ejector that generated 6 inches of
>> water pressure drop under shop runup conditions. That equates to a
>> considerable shaft power savings, more reliable ground cooling and a big
>> step forward. And this was Airesman's first attempt.
>>
>> There are other success stories if you choose to seek them out.
>>
>> Best regards,
>> Marc de Piolenc
>>
>> Those seem like good enough reasons to pass on an augmentor unless you
>> are one of those guys that just has to prove it to yourself.
>>
>> Mike Wills
>>
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