From: "lehanover lehanover@aol.com" <flyrotary@lancaironline.net>
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Date: Mon, 19 Oct 2020 12:48:30 +0000 (UTC)
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To: flyrotary@lancaironline.net
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Subject: Re: [FlyRotary] Re: Tuning
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The racer idles at 2200 RPM. Because the flywheel is just the flex plate an=
d lightened rotors. The engine will shake violently below about 1600 RPM. I=
t will beat the gear box to death with actual reversals. With the steady dr=
ag of a prop, idle could be lower but don't let it shake at all. Very bad m=
ojo.....=C2=A0In olden times we ran just 20 degrees of advance. Very safe b=
ut a bit less power. Good up to 9,000 RPM.For higher RPM up to 10,000,=C2=
=A0 24 degrees of advance is fine. Pump gas 87 octane.=C2=A0 More advance n=
eeds more octane.Once hot, idle advance can be up to 35 degrees with very l=
ean mixture.=C2=A0=C2=A0Lynn E. Hanover=C2=A0In a message dated 10/19/2020 =
9:06:08 AM Atlantic Standard Time, flyrotary@lancaironline.net writes:=C2=
=A0
Hi Matt, when you write 600 or 700 rpm - do you mean engine rpm or prop rpm=
??My engine idles at 1700 rpm (engine), because that's where I set it: divi=
ded by 2.85 =3D 596 prop rpm=C2=A0 - my engine and the gearbox get rough ar=
ound 1550 ... so I keep it away from there.Don't know absolute AFR numbers =
but my engine usually idles richer than 14.7 (stoich) when cold but after i=
t warms up I find it idles better (post-flight taxi back to hangar) a bit o=
n the lean side.Timing - set as per Tracy's manual (25 deg? BTDC) and have =
never moved it, as EC2 advances timing with rpm ...Jeff=C2=A0What AFR and t=
iming are people running for idle, taxi, takeoff, climb, cruise, descent? =
=C2=A0idle =3D 11afr, 20 timingI seem to have to be around 11afr for it to =
stay alive. Still trying to get it to idle around 600rpm, maybe bump it up =
to 700rpm to be smoother without dieing and shaking apart. =C2=A0taxi / tak=
eoff / climb =3D 13.2afr, 28 timingcruise - not sure aft, 28 timingdecent -=
 not sure aft, 32 timingNot sure what the plane likes. I tried 14afr, but t=
he MAP really get's low and engine shakes. Guessing it should be more rich?=
=C2=A0I attached the timing table and split rotary table (second email). No=
t sure how to tune timing, I just want safe values for now.=C2=A0=C2=A0- Ma=
tt Boiteau=C2=A0=C2=A0--Homepage:=C2=A0 http://www.flyrotary.com/Archive an=
d UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrotary/List.html

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<div>
<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;">The racer idles at 2200 RPM. Because the flywheel is just the flex plate and lightened rotors. The engine will shake violently below about 1600 RPM. It will beat the gear box to death with actual reversals. With the steady drag of a prop, idle could be lower but don't let it shake at all. Very bad mojo.....</span></div>
<div>&nbsp;</div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">In olden times we ran just 20 degrees of advance. Very safe but a bit less power. Good up to 9,000 RPM.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">For higher RPM up to 10,000,&nbsp; 24 degrees of advance is fine. Pump gas 87 octane.&nbsp; More advance needs more octane.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Once hot, idle advance can be up to 35 degrees with very lean mixture.</span></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Lynn E. Hanover</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">&nbsp;</span></div>
</div>
In a message dated 10/19/2020 9:06:08 AM Atlantic Standard Time, flyrotary@lancaironline.net writes:
<div>&nbsp;</div>
<div class="quotedReply">
<blockquote style="padding-left: 5px; margin-left: 5px; border-left: blue 2px solid;">
<div dir="ltr">Hi Matt, when you write 600 or 700 rpm - do you mean engine rpm or prop rpm??</div>
<div dir="ltr">My engine idles at 1700 rpm (engine), because that's where I set it: divided by 2.85 = 596 prop rpm&nbsp; - my engine and the gearbox get rough around 1550 ... so I keep it away from there.</div>
<div dir="ltr">Don't know absolute AFR numbers but my engine usually idles richer than 14.7 (stoich) when cold but after it warms up I find it idles better (post-flight taxi back to hangar) a bit on the lean side.</div>
<div dir="ltr">Timing - set as per Tracy's manual (25 deg? BTDC) and have never moved it, as EC2 advances timing with rpm ...</div>
<div dir="ltr">Jeff</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">What AFR and timing are people running for idle, taxi, takeoff, climb, cruise, descent? </div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">idle = 11afr, 20 timing</div>
<div dir="ltr">I seem to have to be around 11afr for it to stay alive. Still trying to get it to idle around 600rpm, maybe bump it up to 700rpm to be smoother without dieing and shaking apart. </div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">taxi / takeoff / climb = 13.2afr, 28 timing</div>
<div dir="ltr">cruise - not sure aft, 28 timing</div>
<div dir="ltr">decent - not sure aft, 32 timing</div>
<div dir="ltr">Not sure what the plane likes. I tried 14afr, but the MAP really get's low and engine shakes. Guessing it should be more rich?</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">I attached the timing table and split rotary table (second email). Not sure how to tune timing, I just want safe values for now.</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">- Matt Boiteau</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">&nbsp;</div>
<div dir="ltr">--</div>
<div dir="ltr">Homepage:&nbsp; <a href="http://www.flyrotary.com/" target="_blank" rel="noopener">http://www.flyrotary.com/</a></div>
<div dir="ltr">Archive and UnSub:&nbsp; <a href="http://mail.lancaironline.net:81/lists/flyrotary/List.html" target="_blank" rel="noopener">http://mail.lancaironline.net:81/lists/flyrotary/List.html</a></div>
</blockquote>
</div>
</div>
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