Kevin;
Curious, isn’t
it? We all start our vehicles every day with no load, and never think a
thing about. The first start of my 20B on the dyno was with no load, and
the first start on the plane was without a prop. It idled fine at about
1200, and I could crack the throttle a bit and control the speed without a
problem. So it depends.
Thing is; it’s bad to
take risks if you don’t fully appreciate the risk you’re taking. If you
don’t have an oversize throttle plate, and have positive control on throttle
position, know your carb (or FI system), etc; go for it. Just recognize
that with even small throttle opening there is potential for the engine to rev
up very quickly.
As far as cooling; it
might be just about as easy to rig a radiator and blower for cooling as the
questionable setup of a 50 ga drum. With no load and low rpm it will
generate very little heat; a household fan blowing on the radiator would likely
be sufficient. And when you do get a load on it, go to your friendly
furnace repair service a get a centrifugal blower for nothing. Of course
you’ll also have to cool the oil. And for sure don’t run without proper
instrumentation.
All that said – is
there some reason to be in a big hurry to get this thing
running?
FWIW;
Al
G
-----Original
Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Tuesday, January
05, 2010 8:52
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: first start check
list
Kevin,
I
certainly would not start the engine without a load on it. Things don’t
always go as planned and more than one person has scattered parts or burnt
bearings by having the engine rev to destruction without a prop (or some kind of
load). Make sure you have oil to the bearings. I would take off the
oil line going back into the engine and crank engine until I see oil coming out
before I would even think of starting it. Folks have reversed the Goes
inna and Comes Outta connections on a remote oil filter – and no oil
flows.
With
an idle setting of 1600 rpm – if I take my prop off, the engine “idles” at 5000
+ rpm. Crack the throttle plate just a bit more and you easily may have
8000 rpm (or much more)
Just
not worth it in my opinion.
Yes,
if all goes as planned you may have not problem – but, just bump the throttle
cable or find the rev limiter not set up properly and you could ruin your
engine.
Good
Luck
Ed
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of kevin lane
Sent: Monday, January
04, 2010 11:59
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] first start check
list
I am just about ready to
try my first attempt at starting my renesis. for my first phase, at least,
I've chosen to use a side draft Weber carb and DIS ignition system, which
Lynn designed using
an MSD ign box for the primaries and 2 Chrysler elec ign's for the trailing
plugs. I thought I'd ask before introducing gasoline to my "creation" of
any steps or checks I need to do first. the engine and mount are bolted to
a mockup plywood firewall held up with steel legs. the psru is installed,
as well as the radiators [oil & water]. exhaust is just headers for
now [pointing down]. when I crank it over all the plugs are firing
[especially the MSD powered ones, which fire multiple times below
1000rpm]. the carb is brand new, with whatever jets they come with.
haven't designed a leaning capability yet.
1. I need to add a oil
pressure gauge right away. I'll need water temp after it gets running for
any length of time. put mineral oil in for initial break-in [turrentine engine,
never run]
2. oh yeah, get it out of
the basement! guess airport best for making lots of
noise
4. got the 6k rpm limiter
plugged in to the MSD
6. fabricate some remote
throttle cable? or do you just stand there and manipulate it by
hand?
guess I fine tune timing
after it is running with a strobe light? I've marked the firing points on
the flexwheel. the pick-ups can be adjusted some if
needed.
I assume I don't need a
prop or club at this point, right?
thought a
small gravity fed fuel tank would work at first.
should I buy new
plugs? the used ones that came with the engine seem to spark
OK.
could I run this early on
with the water pump attached to say a 50 gallon tank of cold water rather than
trying to get it radiator cooled?
kevin [it won't be
loud, will it? ☺]
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