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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Fw: [Bulk] 16x
Date: Thu, 22 Nov 2007 16:51:03 +1000
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> Ed, Lynn and Bill +
>
> This was posted to me privately and may help to clarify the specifications 
> of the 16x. Some of the info are estimations by Rolf  Pfeiffer ex - NSU 
> engineer.
>
>> Hello George
>> Nice to hear from you. Here is my assessment:
>
> Also info supplied by Don Sherman as follows:-
>
> I interviewed Seiji Tashima, the engineering expert for Mazda's new
> rotary, at Tokyo on your behalf. Here are a few details he revealed:
> Rotor width reduced by 5mm saves weight, improves apex seal performance 
> trochoid is 25mm wider, 35mm taller for more displacement and torque 
> would not reveal increase in eccentricity. New displacement is 
> 800cc/rotor.
>
> Aluminum end plates have plasma-sprayed wear surface direct and indirect 
> fuel injection.
>
> Torque gains come from longer e-dimension, more displacement, and direct 
> injection.
>
> He would not confirm 300 hp power goal.
> All the gas seals are improved,  with smaller flame holes adjacent to 
> spark plugs.
> The 16x engine ran for the first time this year, full development will be 
> at least 2 more years.
>
> Engine weight is reduced from 125kg [275 pounds] to 100 kg [220 pounds].
>
> Assessment by Rolf Pfeiffer as follows:-
>
>> /Now, using above dimensions we get the following:
>>
>> 25 mm wider means the short axis goes from 180 to 205 mm.
>> 35 mm taller means the long axis goes from 240 to 275 mm.
>>
>> This results in E = 17.5 mm, and R = 120 mm.
>> The old dimensions were E = 15 mm and R = 105 (including the radius of 3 
>> mm for the apex seals).
>> The ratio R/E is 6.857, down from 7.0.
>>
>> The ratio of stroke to piston area becomes higher which is what they 
>> want, I suppose.
>> The RX7/8’s were 0.33 S/D, above numbers would be 0.3764, a substantial 
>> 14% improvement in ratio of stroke to equivalent piston diameter. A long 
>> stroke engine, so to speak.
>>
>> I also had stated that:
>> NSU also went that direction with their latest developments before 
>> folding.
>> We are lucky that Mazda has the financial means and does carry on.
>>
>> The last big NSU unit EA 871 was approximately like this: (Calculating 
>> back from its displacement and width. I had already left by then, so the 
>> info is calculated.)
>> E = 17.28, R = 120.5, width = 69 (given), displacement = 746.6 cc 
>> (given).
>> This is very close to what Mazda seems to be doing now, if above numbers 
>> are right.
>> NSU had great hopes in that engine. It was used in a German fan-liner. It 
>> was the high point of the Wankel development at NSU.
>> Then the money did run out. NSU was merged with AUDI, and VW the parent, 
>> killed it all. All further development was stopped.
>>
>> Fan Trainer: 
>> http://www.der-wankelmotor.de/Flugzeuge/RFB/rfb.html#Fanliner
>>
>> Regards
>> Rolf
>>
>>
>> George Lendich wrote:
>>> Rolf,
>>> Could you give me your assessment of the new 16X eccentric. If I 
>>> remember correctly you gave you assessment on Paul's site. There is 
>>> discussion on another site and I would like to pass it on to interested 
>>> parties.
>>> Also if my memory serves me right, you mentioned a manufacturer was 
>>> working on a similar size ( change in eccentric) and what company that 
>>> was.
>>> Am I wrong to believe it was the company you were working with at the 
>>> time?
>>> George Lendich
>