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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: cooling for ground runs
Date: Thu, 22 Apr 2010 01:14:52 -0400
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From: shipchief@aol.com
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Bill;
Thanks for taking the time and effort to outline what progress and problem=
s have been encountered in the quest for a lighter Mazda based rotary engi=
ne.=20
Are you thinking about making a 'front' sideplate with mount points? =20
Then we could leave out the bedplate and a few feet of mount tube?
That wouldn't make the engine lighter, but the engine + mount would be eve=
n lighter yet, and open up more space for exhaust systems and coolers.
I'm just asking, because you must have already thought of this, and inquir=
eing minds....
Thanks;
Scott


-----Original Message-----
From: WRJJRS@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Apr 20, 2010 11:43 pm
Subject: [FlyRotary] Re: cooling for ground runs


In a message dated 4/20/2010 9:25:16 PM Pacific Daylight Time, shipchief@a=
ol.com writes:

I'm thinking an aluminum plate of 6061 could be cut, drilled, milled, then=
 the wear faces "Nikasil" equivalent electroplated.
Is that fairly straightforward if P Ported?=20


Chief,
Yes, that is a possible method. Do something for me. Look up the coefficie=
nt of linear expansion for aluminum. Then look up the coefficient of linea=
r expansion for chrome (or Nickasil). You will find that the aluminum is=
 about 10^-5 units per degree F. Chrome is about 10^-6 or 7 units per degr=
ee F. Every time the engine heats up the aluminum is trying to expand itse=
lf right past the coating. It work fairly well in a bore, and less well on=
 a flat surface. That is why Mazda paid so much money to do detonation gun=
 coatings on their all aluminum Le Mans engine. I checked on these coating=
s and they are just silly expensive. The raw coating was about 1000 dollar=
s per FACE and then you need to lap it. In a car used for road racing Nick=
asil might hold up, but think about putting that car on a track with a 200=
 mile long straight-away. That is what our aircraft use is like. I am not=
 one of the dumb car engines can take it guys, but there are differences=
 and some of those differences make it tough to just use coatings. Not imp=
ossible, but expensive. Now if you could make an intermediate housing that=
 was one pound heaver than aluminum but had none of the problems, while st=
ill being around 12-15 pounds lighter than the stocker, doesn't it sound=
 like a good idea?
Bill Jepson
=20


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Bill;</div>


<div>Thanks for taking the time and effort to outline what progress and pr=
oblems have been encountered in the quest for a lighter Mazda based rotary=
 engine. </div>


<div>Are you thinking about making a&nbsp;'front' sideplate with mount poi=
nts?&nbsp; </div>


<div style=3D"CLEAR: both">Then we could leave out the bedplate and a few=
 feet of mount tube?</div>


<div style=3D"CLEAR: both">That wouldn't make the engine lighter, but the=
 engine + mount would be even lighter yet, and open up more space for exha=
ust systems and coolers.</div>


<div style=3D"CLEAR: both">I'm just asking, because you must have already=
 thought of this, and inquireing minds....</div>


<div style=3D"CLEAR: both">Thanks;</div>


<div style=3D"CLEAR: both">Scott</div>


<div><br>
<br>
&nbsp;</div>


<div style=3D"FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt"=
>-----Original Message-----<br>
From: WRJJRS@aol.com<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Tue, Apr 20, 2010 11:43 pm<br>
Subject: [FlyRotary] Re: cooling for ground runs<br>
<br>


<div id=3DAOLMsgPart_2_0884db43-1e3c-4f16-8e88-36860f167719><FONT color=3D=
#000000 size=3D2 face=3DArial>

<div>

<div>In a message dated 4/20/2010 9:25:16 PM Pacific Daylight Time, <A hre=
f=3D"mailto:shipchief@aol.com">shipchief@aol.com</A> writes:</div>

<BLOCKQUOTE style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGI=
N-LEFT: 5px"><FONT style=3D"BACKGROUND-COLOR: transparent" color=3D#000000=
 size=3D2 face=3DArial><FONT color=3Dblack size=3D2 face=3Darial>

<div>I'm thinking an aluminum plate of 6061 could be cut, drilled, milled,=
 then the wear faces "Nikasil" equivalent electroplated.</div>


<div>Is that fairly straightforward if P Ported? </div>
</FONT></FONT></BLOCKQUOTE></div>


<div></div>


<div>Chief,</div>


<div>Yes, that is a possible method. Do something for me. Look up the coef=
ficient of linear expansion for aluminum. Then look up the coefficient of=
 linear expansion for chrome (or Nickasil). You will find that the aluminu=
m is about 10^-5 units per degree F. Chrome is about 10^-6 or 7 units per=
 degree F. Every time the engine heats up the aluminum is trying to expand=
 itself right past the coating. It work fairly well in a bore, and less we=
ll on a flat surface. That is why Mazda paid so much money to do detonatio=
n gun coatings on their all aluminum Le Mans engine. I checked on these co=
atings and they are just silly expensive. The raw coating was about 1000=
 dollars per FACE and then you need to lap it. In a car used for road raci=
ng Nickasil might hold up, but think about putting that car on a track wit=
h a 200 mile long straight-away. That is what our aircraft use is like. I=
 am not one of the dumb car engines can take it guys, but there are differ=
ences and some of those differences make it tough to just use coatings. No=
t impossible, but expensive. Now if you could make an intermediate housing=
 that was one pound heaver than aluminum but had none of the problems, whi=
le still being around 12-15 pounds lighter than the stocker, doesn't it so=
und like a good idea?</div>


<div>Bill Jepson</div>


<div>&nbsp;</div>
</FONT></div>
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</font>

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