flyrotary@lancaironline.net Mailing List Archive

Mark, I am running a multi-v pully that is slightly undersized from the stock pulley. It is about 1/2 inch smaller in diameter. I don't know who makes them but Adkins used to sell it. Maybe you can find out from him. Good Luck, Dave Leonard > > 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/ > > > > > >> 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 > > > > > > > > >> 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 >