Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3207827 for flyrotary@lancaironline.net; Wed, 05 May 2004 18:39:44 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i45MdeSn001346 for ; Wed, 5 May 2004 18:39:42 -0400 (EDT) Message-ID: <001401c432f1$dc6266c0$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Coolant Pressure Gauge Date: Wed, 5 May 2004 18:39:43 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine 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" To: "Rotary motors in aircraft" 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" > >To: "Rotary motors in aircraft" > >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" > > > >To: "Rotary motors in aircraft" > > > >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