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Subject: Re: [FlyRotary] Re: Back to Phase 1 testing
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From: Tracy <rwstracy@gmail.com>
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Date: Sat, 30 Jul 2011 08:32:31 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Yeah, it was kind of a yawner.  Except for the burning smell.  Wasn't sure i=
f it was fiberglass or electrical for a minute there.   Haven't removed the d=
ead coils yet but I'm pretty sure they are the culprits.   Still haven't fou=
nd how the smell migrated to the cockpit though.

I think the rotor 3 went (actually rotor 1 but I labeled my EGTs front to ba=
ck) because they were at the end of the cooling plenum farthest from the bla=
st tube.  This was also the hottest day that I have done an extended climb a=
t high power.  I have a temperature probe near those two coils and I noticed=
 the ambient around them got as high as 170 F.  Need to do some testing to d=
etermine if that blast tube is furnishing enough air.  Oil and water temps s=
tayed below  200 the whole time.  They dropped into the 125F range during th=
e descent to landing.

Tracy


Sent from my iPad

On Jul 29, 2011, at 5:22 PM, "Ed Anderson" <eanderson@carolina.rr.com> wrote=
:

> Gee, two rotors to come home on doesn't provide much excitement, Tracy.
>=20
> Sort of reminds me way back in the old days of using the Rx-7 ignition coi=
ls and ballast resistors blowing on them.  For some reason seems like that o=
nly happened to you and me.
>=20
> We are all awaiting some performance numbers for that RV8-3R, so next time=
 take your bottle and give those Ls1 coils a real try out.
>=20
> Ed
>=20
> --------------------------------------------------
> From: "Tracy" <rwstracy@gmail.com>
> Sent: Friday, July 29, 2011 2:13 PM
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Back to Phase 1 testing
>=20
>> Was finally getting around to doing hot weather cooling and altitude perf=
ormance testing in the RV-8 yesterday.   Cooling was good during a high powe=
r climb to 14500 ft where I leveled out ( I had forgotten to put the Ox bott=
le in the plane).   Throttled up to WOT to see where the speed topped out at=
 but.   After less than a minute I felt some engine roughness and noticed ro=
tor 3 EGT went above alarm threshold so I throttled back to low power.   #3 E=
GT then went low off scale and I could tell that the engine was only running=
 on 2 rotors.   I then smelled a faint electrical burning smell that lasted a=
bout 2 minutes.   Engine was surprisingly smooth for having a dead rotor and=
 still had more than enough power for cruise flight but obviously it was tim=
e to get back on the ground and find out what went wrong.   did all the usua=
l diagnostics on the long glide down with no joy.
>>=20
>> Made normal landing, poped off the cowl and coil diagnostics test reveale=
d that both coils on rotor 3 were dead.   I had done the coil disable tests p=
rior to takeoff so I know they were both good then.  I'm using RX-8 coils an=
d there have been too many failures for me to feel good about them any longe=
r.   I ordered a set of LS-1s to replace them.
>>=20
>> Tracy
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.=
html
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List=
.html