From: "lehanover lehanover@aol.com" <flyrotary@lancaironline.net>
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Date: Mon, 15 Mar 2021 23:00:59 +0000 (UTC)
Reply-To: lehanover <lehanover@aol.com>
To: flyrotary@lancaironline.net
Message-ID: <1928380853.891293.1615849259998@mail.yahoo.com>
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Subject: Re: [FlyRotary] MISTRAL
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I did not. I was asked to travel about inspecting installations prior to fi=
rst flight, or to assist with installations. But=C2=A0=C2=A0if asked I woul=
d have suggested Ceramic=C2=A0 seals.=C2=A0=C2=A0 We raced with Carbon seal=
s and later, Ceramic seals. Carbons wear too fast for aircraft use but are =
soft and leave the housing chrome looking better than new as the years go b=
y. No detectable wear at all. Near perfect sealing.=C2=A0 No skipping, no n=
eed for an extra spring.Same for Ceramics. Light weight. No wear. Very expe=
nsive. But if you can use the same housings for 4 or 5 years, then not so b=
ad.=C2=A0 The duty cycle of an aircraft engine is much tougher than that of=
 a racer or street engine.=C2=A0=C2=A0All early engines Had the wide carbon=
 seals. We machined them down to fit the later rotors. So early housings wo=
uld often run well over 100,000 miles.=C2=A0 The iron seals with a chrome f=
ace have you running a chrome face against a chrome housing. Bad Mojo. With=
 Premixing and or oil injection not so bad. Hard starting suggests=C2=A0wor=
n apex seals.=C2=A0 Both ceramic and carbon seals need to be sized to the h=
ousing width.Any question, any time.=C2=A0Lynn E. Hanover=C2=A0=C2=A0=C2=A0=
message dated 3/14/2021 11:29:17 PM Eastern Standard Time, flyrotary@lancai=
ronline.net writes:=C2=A0
Lee Hanover,=C2=A0 =C2=A0 I seem to remember that you had some interaction =
back in the day with "MISTRAL" when they were developing theirRotary engine=
s .........If so did you ever hear what tip seals they used in their engine=
s ? (Iron , Ceramic , Etc)...........=C2=A0Thanks,
--=20
Kelly Troyer


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<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">I did not. I was asked to travel about inspecting installations prior to first flight, or to assist with installations. </span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">But&nbsp;</span><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">&nbsp;if asked I would have suggested Ceramic&nbsp; seals.&nbsp;</span></div>
<div>&nbsp;</div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"> We raced with Carbon seals and later, Ceramic seals. Carbons wear too fast for aircraft use but are soft and leave the housing chrome looking better than new as the years go by. No detectable wear at all. Near perfect sealing.&nbsp; No skipping, no need for an extra spring.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Same for Ceramics. Light weight. No wear. Very expensive. But if you can use the same housings for 4 or 5 years, then not so bad.&nbsp; The duty cycle of an aircraft engine is much tougher than that of a racer or street engine.&nbsp;&nbsp;</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">All early engines Had the wide carbon seals. We machined them down to fit the later rotors. So early housings would often run well over 100,000 miles.&nbsp; The iron seals with a chrome face have you running a chrome face against a chrome housing. Bad Mojo. With Premixing and or oil injection not so bad. Hard starting suggests&nbsp;</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">worn apex seals.&nbsp; Both ceramic and carbon seals need to be sized to the housing width.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Any question, any time.&nbsp;</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Lynn E. Hanover&nbsp;</span></div>
<div>&nbsp;</div>
<div><span style="font-family: 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', EmojiSymbols, sans-serif; font-size: 10pt;">&nbsp;message dated 3/14/2021 11:29:17 PM Eastern Standard Time, flyrotary@lancaironline.net writes:</span></div>
</div>
<div>&nbsp;</div>
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<blockquote style="padding-left: 5px; margin-left: 5px; border-left: blue 2px solid;">
<div id="yiv5794938818">
<div dir="ltr">Lee Hanover,
<div>&nbsp; &nbsp; I seem to remember that you had some interaction back in the day with "MISTRAL" when they were developing their</div>
<div>Rotary engines .........If so did you ever hear what tip seals they used in their engines ? (Iron , Ceramic , Etc)...........</div>
<div>&nbsp;</div>
<div>Thanks,<br>-- <br>
<div class="yiv5794938818gmail_signature" dir="ltr">Kelly Troyer<br><br><br></div>
</div>
</div>
</div>
</blockquote>
</div>
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