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Date: Thu, 30 Aug 2012 13:17:49 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Nutating-Disk-Engine
In-Reply-To: <listdigest-5735733@logan.com>
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Another interesting idea, but I'm afraid this one is doomed like all the ot=
hers in the past.=A0 As air machines go, the I.C. engine has to operate at =
a relatively high pressure to have good efficiency.=A0 Therefore, sealing t=
he pressure is a fundamental concern.=A0 The piston engine wins this game, =
as the total length of seal per displacement is about as short as you can g=
et.=A0 And the geometry of the seal is simple (circle).=A0 And one side of =
the seal can be cool and lubricated.=A0 The outer seal of the nutating engi=
ne reminds me of the apex seal in a rotary, with no lube on either side.=A0=
 It does have an advantage in that the contact surface stays at the same re=
lative angle, and the surface velocity is relatively low.=A0 But the other =
sealing surfaces are pretty complex, as are the corners.=A0 The combustion =
chamber (shape of the chamber with the vane at "top dead center" is far fro=
m optimal and there is a geometric limit to the maximum attainable
 compression ratio.=A0 Bottom line is that the efficiency will be low, and =
in thevideo they even admit to a BSFC of between .5 and .6.=A0 You won't ha=
ve to be aloft very long before the weight of the fuel burned will offset t=
he weight savings of the engine.=A0 Overall, I'll give it a C as a nice try=
.=A0 Too bad - it would be nice to see some new technology surface.=0AGary=
=0A=A0=0AThere are so many new ideas for engines to replace the good ole pi=
ston engine, but almost none of them ever make it into production.  The anc=
ient piston rules.  Here is another one of those new engine ideas which see=
m to have several significant advantages over piston engines (No one usuall=
y lists the disadvantages).  This one can be compression ignition, 2 to 4 t=
imes the power to weight, multifuel including JP8, more efficient, far less=
 vibration, less complex, and can be self supercharged.  You are going to l=
ike this one.=0A=0A=0Ahttp://www.engineeringtv.com/video/Nutating-Disk-Engi=
ne-Delivers-
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Another intere=
sting idea, but I'm afraid this one is doomed like all the others in the pa=
st.&nbsp; As air machines go, the I.C. engine has to operate at a relativel=
y high pressure to have good efficiency.&nbsp; Therefore, sealing the press=
ure is a fundamental concern.&nbsp; The piston engine wins this game, as th=
e total length of seal per displacement is about as short as you can get.&n=
bsp; And the geometry of the seal is simple (circle).&nbsp; And one side of=
 the seal can be cool and lubricated.&nbsp; The outer seal of the nutating =
engine reminds me of the apex seal in a rotary, with no lube on either side=
.&nbsp; It does have an advantage in that the contact surface stays at the =
same relative angle, and the surface velocity is relatively low.&nbsp; But =
the other sealing surfaces are pretty complex, as are the
 corners.&nbsp; The combustion chamber (shape of the chamber with the vane =
at "top dead center" is far from optimal and there is a geometric limit to =
the maximum attainable compression ratio.&nbsp; Bottom line is that the eff=
iciency will be low, and in thevideo they even admit to a BSFC of between .=
5 and .6.&nbsp; You won't have to be aloft very long before the weight of t=
he fuel burned will offset the weight savings of the engine.&nbsp; Overall,=
 I'll give it a C as a nice try.&nbsp; Too bad - it would be nice to see so=
me new technology surface.</div><div>Gary</div><div>&nbsp;</div><div>There =
are so many new ideas for engines to replace the good ole piston engine, bu=
t almost none of them ever make it into production.  The ancient piston rul=
es.  Here is another one of those new engine ideas which seem to have sever=
al significant advantages over piston engines (No one usually lists the dis=
advantages).  This one can be compression ignition, 2 to 4 times the
 power to weight, multifuel including JP8, more efficient, far less vibrati=
on, less complex, and can be self supercharged.  You are going to like this=
 one.<br><br><br><a href=3D"http://www.engineeringtv.com/video/Nutating-Dis=
k-Engine-Delivers-H" target=3D"_blank"><font color=3D"#234786">http://www.e=
ngineeringtv.com/video/Nutating-Disk-Engine-Delivers-</font></a></div></div=
></body></html>
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