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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2500637@logan.com>
Subject: Re: [FlyRotary] Re: Fw: [Bulk] 16x
Date: Fri, 23 Nov 2007 08:31:42 +1000
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Ed,
Very interesting chap Rolf, he has a lot of history and a lot of knowledge 
regarding the Rotary engine. I might suggest this forum for his interest - 
his contributions would be a benefit to any forum such as this one. I 
believe it was Jerry hey that put me in touch with him originally - BTW 
Jerry put up a number of photo's on the 16X, I though he may have put them 
up here as well - are you reading this Jerry?.
George (down under)

> Thanks, George, that in indeed interesting information.  Long throw should 
> mean more torque.  Be interesting to see how they have improved the 
> sealing. Two years more development then all the production (assuming they 
> go forward with it), so I should expect to see it for at least 5 years. 
> Well, hopefully the old 13B will hold out for that long.
>
> Ed
> ----- Original Message ----- 
> From: "George Lendich" <lendich@optusnet.com.au>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, November 22, 2007 1:51 AM
> Subject: [FlyRotary] Fw: [Bulk] 16x
>
>
>>
>>
>>> 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
>>>
>>
>>
>> --
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