From: "Charlie England" <flyrotary@lancaironline.net>
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Date: Sat, 23 Jul 2016 08:06:44 -0500
Message-ID: <CAHxyc51rXg6XrUpwUbVyFVkx+Jt8E40-ynMMfVdnnbAcB=3qXQ@mail.gmail.com>
Subject: Re: [FlyRotary] Re: rebuild
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On Sat, Jul 23, 2016 at 6:11 AM, Andrew Martin <flyrotary@lancaironline.net>
wrote:

> Ok, an update.
>
> Turns out I rebuilt an engine for no reason other than for the experience.
> seems no damage from my problems on first flight. decided to replace all
> the soft parts but as I live just a bit West of most on this forum, it
> makes it a bit hard to get parts, even Mazda could not deliver orings
> without 3 week delay so I just bought some viton cord for the coolant rings
> and made my own. they seem to be holding up Ok for now.
>
> When I reinstalled the engine, filled it up with coolant and pressure
> tested, it leaked like a bastard past a hose clamp on the rear iron.  The
> fitting is usually used for cabin heat in the car but I got it blocked off
> and didn't touch it during the rebuild, so now I'm pretty sure this is
> where the coolant leaked from on that first flight.
>
> Have now installed a fence in the ducting to separate oil and coolant
> radiators and opened up the air intake about 50% bigger to try and get more
> air in. Its the dead of winter here, so daily temps are about 20c , doesn't
> get much colder only hotter as summer approaches so I need to get this
> thing flying soon to be able to take advantage of the cool temps.
>
> Took it out onto the main rwy for a fast taxi run, its a long long taxi to
> get to the threshold so temps rise and hopes drop, but on the rwy temps are
> 140 coolant 180 oil at 70kts. so confidant I can probably stabilize the
> temps in flight now.
>
> But I tell yer, if I ever catch that bloody Murphy bloke, I'll make him
> squeal.  for some reason now everytime I transmit on the radio the engine
> runs crook, let go of the ptt and all good again, and the fast run down the
> paddock done something to one of my wheels as there was a horrible noise
> from down there on the taxi back to the shed. so I got things to sort out
> first tomorrow.
>
> Andrew
>
> Radio transmission driving other electronics crazy is often a ground path
issue. (That's assuming the antenna wiring run was done correctly, with the
coax shield properly terminated at the radio and to the ground plane at the
antenna.)

Did you bring all your power supply ground returns to a central point near
the battery? If not, the radio may be finding a ground return path through
the engine controller's ground path, which can make the controller see
significant voltage swings, and the 'noise' from the radio.

Careful on the high speed ground work; that's an unnatural act in an
airplane. Kinda like, it's relatively easy to dribble a basketball (or a
soccer ball), but hard to stand on either one.

Charlie

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Sat, Jul 23, 2016 at 6:11 AM, Andrew Martin <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank">flyrotary@la=
ncaironline.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v dir=3D"ltr"><div><div><div><div><div><div>Ok, an update.<br><br></div>Tur=
ns out I rebuilt an engine for no reason other than for the experience. see=
ms no damage from my problems on first flight. decided to replace all the s=
oft parts but as I live just a bit West of most on this forum, it makes it =
a bit hard to get parts, even Mazda could not deliver orings without 3 week=
 delay so I just bought some viton cord for the coolant rings and made my o=
wn. they seem to be holding up Ok for now.<br><br></div>When I reinstalled =
the engine, filled it up with coolant and pressure tested, it leaked like a=
 bastard past a hose clamp on the rear iron.=C2=A0 The fitting is usually u=
sed for cabin heat in the car but I got it blocked off and didn&#39;t touch=
 it during the rebuild, so now I&#39;m pretty sure this is where the coolan=
t leaked from on that first flight.<br><br></div>Have now installed a fence=
 in the ducting to separate oil and coolant radiators and opened up the air=
 intake about 50% bigger to try and get more air in. Its the dead of winter=
 here, so daily temps are about 20c , doesn&#39;t get much colder only hott=
er as summer approaches so I need to get this thing flying soon to be able =
to take advantage of the cool temps. <br><br></div>Took it out onto the mai=
n rwy for a fast taxi run, its a long long taxi to get to the threshold so =
temps rise and hopes drop, but on the rwy temps are 140 coolant 180 oil at =
70kts. so confidant I can probably stabilize the temps in flight now.<br><b=
r></div>But I tell yer, if I ever catch that bloody Murphy bloke, I&#39;ll =
make him squeal.=C2=A0 for some reason now everytime I transmit on the radi=
o the engine runs crook, let go of the ptt and all good again, and the fast=
 run down the paddock done something to one of my wheels as there was a hor=
rible noise from down there on the taxi back to the shed. so I got things t=
o sort out first tomorrow.<span class=3D"HOEnZb"><font color=3D"#888888"><b=
r><br></font></span></div><span class=3D"HOEnZb"><font color=3D"#888888">An=
drew<br><br></font></span></div>
</blockquote></div>Radio transmission driving other electronics crazy is of=
ten a ground path issue. (That&#39;s assuming the antenna wiring run was do=
ne correctly, with the coax shield properly terminated at the radio and to =
the ground plane at the antenna.)</div><div class=3D"gmail_extra"><br></div=
><div class=3D"gmail_extra">Did you bring all your power supply ground retu=
rns to a central point near the battery? If not, the radio may be finding a=
 ground return path through the engine controller&#39;s ground path, which =
can make the controller see significant voltage swings, and the &#39;noise&=
#39; from the radio.</div><div class=3D"gmail_extra"><br></div><div class=
=3D"gmail_extra">Careful on the high speed ground work; that&#39;s an unnat=
ural act in an airplane. Kinda like, it&#39;s relatively easy to dribble a =
basketball (or a soccer ball), but hard to stand on either one.</div><div c=
lass=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Charlie</div></di=
v>

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