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Message-ID: <z2m5cf132c1004051131jbaa10a98lef9f1eeee695078@mail.gmail.com>
Subject: Re: [FlyRotary] youtube strobe
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=000e0cd0ea86913fa804838188ee

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Kevin,

How about a little more info on your MSD hybrid ignition system design?  Ho=
w
is the MSD triggered?

Mark S.

On Sun, Apr 4, 2010 at 10:13 PM, kevin lane <n3773@comcast.net> wrote:

>  I questioned my tach accuracy in my video.  it was shot at 30 fps, or
> 1800 f/min.  I saw the engine start and indicate about 300rpm, and 6 prop
> blade blurs show.  I sped it up until it started to die at 1500 rpm
> indicated.[prop blur shows reverse rotation].   at what I'd guess was
> indicating 1000rpm the prop shows as a steady, 2-bladed non-rotating blur=
.
> assuming that the camera is catching the same prop blade twice, 180=B0 ap=
art,
> that would be at half the 1800 rpm on the camera, right?  so, 900rpm isn'=
t
> far from my guess of 1000rpm [from memory based on how the engine sounded=
 in
> the video].   same for 300rpm/6 blade blur - 1800/6 =3D 300 rpm.   still =
seems
> like a lot of wind for 300rpm, considering my Lycoming idles at twice tha=
t
> speed, but then, I'm typically inside the cockpit, and the test prop
> 68x66(?) [from a 150hp rv-4].
>
> I intend to run it without the prop in a week so I can check my timing
> without endangering my life.  the msd ignition box has 3000/6000/9000rpm
> limiter pills which can assist in keeping limits, altho the trailing
> ignitions have none.  I can attempt to run the ignitions separately, no i=
dea
> if it will run that way at this point.  another option would be to tow it
> over to pineapple racing and hear what rob golden has to say.  they are j=
ust
> on the other side of the airport.
>
>
> KevinLane Carpentry
> www.KevinLaneCarpentry.com <http://www.kevinlanecarpentry.com/>
>

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<div>Kevin, </div>
<div>=A0</div>
<div>How about a little more info on your MSD hybrid ignition system design=
?=A0 How is the MSD triggered?=A0 </div>
<div>=A0</div>
<div>Mark S.=A0 <br><br></div>
<div class=3D"gmail_quote">On Sun, Apr 4, 2010 at 10:13 PM, kevin lane <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:n3773@comcast.net">n3773@comcast.net</a=
>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div bgcolor=3D"#ffffff">
<div><font face=3D"Comic Sans MS">I questioned my tach accuracy in my video=
.=A0 it was shot at 30 fps, or 1800 f/min.=A0 I saw the engine start and in=
dicate about 300rpm, and 6 prop blade blurs show.=A0 I sped it up until it =
started to die at 1500 rpm indicated.[prop blur shows reverse rotation]. =
=A0 at what I&#39;d guess was indicating 1000rpm the prop shows as a steady=
, 2-bladed non-rotating=A0blur.=A0 assuming that the camera is catching the=
 same prop blade twice, 180=B0 apart, that would be at half the 1800 rpm on=
 the camera, right?=A0 so, 900rpm isn&#39;t far from my guess of 1000rpm [f=
rom memory based on=A0how the engine sounded in the video].=A0=A0 same for =
300rpm/6 blade blur - 1800/6 =3D 300 rpm.=A0=A0 still seems like a lot of w=
ind for 300rpm, considering my Lycoming idles at twice that speed, but then=
, I&#39;m typically inside the cockpit, and the test prop=A0 68x66(?) [from=
 a 150hp rv-4].</font></div>

<div><font face=3D"Comic Sans MS"></font>=A0</div>
<div><font face=3D"Comic Sans MS">I intend to run it without the prop in a =
week so I can check my timing without endangering my life.=A0 the msd ignit=
ion box has=A03000/6000/9000rpm limiter pills which can assist in keeping l=
imits, altho the trailing ignitions have none.=A0 I can attempt to run the =
ignitions separately, no idea if it will run that way at this point.=A0 ano=
ther option would be to tow it over to pineapple racing and hear what rob g=
olden has to say.=A0 they are=A0just on the other side of=A0the airport.</f=
ont></div>

<div><font face=3D"Comic Sans MS"></font>=A0</div>
<div>=A0</div>
<div><font face=3D"Comic Sans MS">KevinLane Carpentry<br><a href=3D"http://=
www.kevinlanecarpentry.com/" target=3D"_blank">www.KevinLaneCarpentry.com</=
a></font></div></div></blockquote></div><br>

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