----- Original Message -----
Sent: Monday, February 09, 2009 9:30
AM
Subject: [FlyRotary] NEW failure mode for
13B
Well, I haven't heard of this happening before --
I was ground running my engine to tune it with the EM-2 and EC-2.
Ran for almost an hour, at various rpm's to change the manifold pressure and
tweak the settings. Cooling working well, I had the top cowling off to allow
good exit area since I was tied down. Coolant pressure about 14 psi as
reported on the EM-2.
Engine was running good, took it up to ~6000 rpm
swinging a 76x76 Catto prop, when suddenly there was steam and fluid on my
windshield. Shut it down by killing power to the EC-2. Coolant
everywhere.
Got out and looked to diagnose the problem -- NOT
my plumbing. A FREEZE PLUG in the iron housing had blown out. Rapid
coolant dump.
Secondary effect -- Since I shut down suddenly
from full tilt, either the proximity of the cowl to the exhaust, or possibly
some of the coolant on the exhaust started a small fire on my cowl. Put it out
with extinguisher, but corner is charred.
Bill Schertz
KIS Cruiser
#4045
N343BS
Now in repair mode.