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Mark,
I use a Racing Beat main pulley which underdrives all belt driven
accessories by 20%, then my alternator has also has a Racing Beat twin
Sheave pulley which causes the alternator to be undriven by another 20%. So
supposedly my alternator is underdriven to the vicinity of 40%. Still
provides plenty of power to drive to landing lights, strobes, radios, pumps,
injectors and ignition, etc and keep the battery charged.
Mazdatrix.com at least used to sell both pulleys which are twin belt
pulleys. I got mine back in 1994 so don't know if they still sell them
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Mark Steitle" <msteitle@mail.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, May 05, 2004 3:06 PM
Subject: [FlyRotary] Re: Coolant Pressure Gauge
> Well, that's interesting. This reminds me of a nagging question I have
> had, but haven't asked.
>
> I was curious about the need to go to a smaller crank pulley to slow down
> the water pump and alternators.
> From memory, the crank pulley is about 5-1/2", the alternator pulleys are
> about 2-1/2", and the water pump
> pulley is about 4" diameter.
>
> So, running an RD-2C (2.85 ratio), the alternators will be turning about
> 20k during climb-out and the wp will be turning
> about 10K rpm. That seems too fast to me. I could probably find larger
> pulleys for the alternators, but
> then there's the water pump pulley. Your unplanned experiment would
> suggest that we can run the wp slower
> and still cool adequately.
>
> This brings me to a second option. I think a simpler approach would be to
> reduce the size of the crank pulley.
> The problem is that I haven't found a multi-V reducing pulley at any of
the
> after-market suppliers. I really don't
> want to change over all the multi-V pulleys to single V pulleys, but that
> is one option.
>
> Another solution might be to find a smaller pulley from another vehicle
and
> adapt it to fit the rotary. If that doesn't
> work, I could have one made.
>
> So, am I worrying about nothing, or is this a real problem?
>
> Mark
>
>
> At 02:26 PM 5/5/2004 -0400, you wrote:
> >Actually, Mark, I did not notice any variance in the cooling system from
> >the normal. I just checked my flight log for that trip and at cruise my
oil
> >and coolant ranged from 160-170F which is normal. I too would have
thought
> >that as loose as the belts were (I could easily turn the water pump
against
> >the belt friction by hand) that the water pump would have slowed down
> >sufficiently to have elevated the coolant temp. But, it apparently did
not.
> >
> >Perhaps another way of looking at it is in regards to the power needed to
> >drive sufficient coolant, apparently not very much which corresponds well
> >with the 1/3 - 1/2 HP of the EWPs.
> >
> >Ed
> >.
> >Ed Anderson
> >RV-6A N494BW Rotary Powered
> >Matthews, NC
> >----- Original Message -----
> >From: "Mark Steitle" <msteitle@mail.utexas.edu>
> >To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> >Sent: Wednesday, May 05, 2004 8:57 AM
> >Subject: [FlyRotary] Re: Coolant Pressure Gauge
> >
> >
> > > Ed,
> > > You reported a loose alternator/water pump belt(s) while on your way
back
> > > from SNF causing the alternator field breaker to trip. Did you notice
any
> > > changes in water pressure that could be associated with the loose
> > > alternator belts?
> > >
> > > Mark S.
> > >
> > >
> > > At 08:09 AM 5/5/2004 -0400, you wrote:
> > > >Steve,
> > > >
> > > > I use a 0-30 psi fuel pressure sensor and gauge for my coolant
> >pressure
> > > >sensor and its still working fine after close to 300 hours. At one
time
> > > >(and they may still do) UMA offered a coolant (or water) pressure
gauge
> >so
> > > >marked - they actually silk screened a new placard and placed it in
the
> >fuel
> > > >gauge I purchased from them. So my fuel gauge actually says "Water
> > > >Pressure"
> > > >
> > > > The coolant gauge gives you pressure information that you soon
begin
> >to
> > > >correlate with your coolant temperature as well as OAT. You soon
begin
> >to
> > > >notice when anything departs from the norm. Its simple another bit
of
> > > >information about your system which does nothing for you most of the
time
> > > >but provide that comfort level that things are nominal - but, can
alert
> >you
> > > >to departures from the nominal which bear investigating.
> > > >
> > > >
> > > >Ed
> > > >
> > > >Ed Anderson
> > > >RV-6A N494BW Rotary Powered
> > > >Matthews, NC
> > > >----- Original Message -----
> > > >From: "Steve Brooks" <steve@tsisp.com>
> > > >To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > > >Sent: Wednesday, May 05, 2004 7:18 AM
> > > >Subject: [FlyRotary] Re: Mystery of the leaking coolant
> > > >
> > > >
> > > > > Yes, it does sound like a good idea. I've looked for a sender and
> >gauge,
> > > > > but haven't found any. Does anyone have a good source for these ?
> > > > >
> > > > > Steve Brooks
> > > > >
> > > > > -----Original Message-----
> > > > > From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]On
> > > > > Behalf Of Bill Dube
> > > > > Sent: Tuesday, May 04, 2004 9:04 PM
> > > > > To: Rotary motors in aircraft
> > > > > Subject: [FlyRotary] Re: Mystery of the leaking coolant
> > > > >
> > > > >
> > > > >
> > > > > >
> > > > > >With the overflow plugged it was probably building up some pretty
> >good
> > > > > >pressure, which I'm sure led to the failure of the pump seal. It
is
> >such
> > > > > an
> > > > > >odd thing to have happened, but I'm glad that my days of chasing
the
> > > >drips
> > > > > >of coolant are over. I think that the hoses must be there to
stay,
> >since
> > > > > >they didn't blow off.
> > > > >
> > > > > In "The Book" Tracy strongly suggests installing a
coolant
> >system
> > > > > pressure gauge. It sounds like it might be a good suggestion, in
light
> >of
> > > > > the trouble you had.
> > > > >
> > > > >
> > > > >
> > > > > >> Homepage: http://www.flyrotary.com/
> > > > > >> Archive: http://lancaironline.net/lists/flyrotary/List.html
> > > > >
> > > > >
> > > > > >> Homepage: http://www.flyrotary.com/
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> > > > >
> > > >
> > > >
> > > >
> > > > >> Homepage: http://www.flyrotary.com/
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> > >
> > >
> > > >> Homepage: http://www.flyrotary.com/
> > > >> Archive: http://lancaironline.net/lists/flyrotary/List.html
> >
> >
> >
> > >> Homepage: http://www.flyrotary.com/
> > >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
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