---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/23/22: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:44 AM - Re: AC current reading for Revmaster engine (dj_theis) 2. 06:37 AM - Regulator location (dj_theis) 3. 07:00 AM - Re: Regulator location (Art Zemon) ________________________________ Message 1 _____________________________________ Time: 05:44:08 AM PST US Subject: AeroElectric-List: Re: AC current reading for Revmaster engine From: "dj_theis" > Checking the DC current after the voltage regulator would not be as indicative since there would be some loss in the regulator and if the regulator is the shunt type DC current would not represent what the stator is actually producing. Ive measured and analyzed the Revmaster charge system numerous ways. The OEM regulator is NOT a shunt regulator. Trying to measure the AC current will provide absolutely no advantage (unless you are replacing the original regulator with a shunt,). A shunt regulator will effectively double the heating of the worst case charging (the original regulator is a half wave, not a full wave). I would strongly advocate using the original equipment regulator. And definitely not installing a shunt regulator. This charge system has (at least) 4 flaws. 1) low air flow/cooling. 2) erroneous stator design with magnetically saturated laminates. 3) no resin coating infusion on the windings 4) low air flow/cooling. I injected DC current from a lab supply through the stator winding on the bench and measured the rise in temperature of the surface of the stator wire and the center laminate steel. Ive concluded that continuous DC at 15 amps with an ambient temperature of 100 F will not create a temperature rise that is damaging (steady state of below 140 F). I can forward the temperature curves if anyone is interested. Increasing air flow is job 1, wrt cooling this stator. Impregnating the wiring is an improvement that I advocate but do not have data on it. My direct conversation with the stator wire manufacturer, and their recommendation suggests to me it would be an improvement. I can share the method of impregnating the stator wiring that Im using with the web, but Im reluctant to advertise this until I can verify there is no damage to the ignition coils. Ive tested impregnation on the stator coils but the locally mounted ignition coil wire is different (much smaller and from an unknown supplier). Hope this helps, Dan -------- Dan Theis Scratch building Sonex #1362 Still working on the Revmaster Alternator improvement Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507925#507925 ________________________________ Message 2 _____________________________________ Time: 06:37:42 AM PST US Subject: AeroElectric-List: Regulator location From: "dj_theis" Ive been trading emails with another builder and they asked my thoughts on the location of the ships voltage regulator. What are the pros and cons to mounting the regulator on the occupant side of the firewall. My thoughts are below but I think this is a question better served by this forum than my opinion. Pros: Likely cooler environment (although you might not appreciate the added heat in the summer). Cons: Harder to find blast air for cooling The high voltage AC wires are routed through a longer path (65 VAC open circuit) Ive never seen this done on certified aircraft or land vehicles. (Maybe not a good reason but something to consider) If they do go up in smoke you will be breathing that smoke. Can the forum comment additionally? Thanks, Dan -------- Dan Theis Scratch building Sonex #1362 Still working on the Revmaster Alternator improvement Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507926#507926 ________________________________ Message 3 _____________________________________ Time: 07:00:55 AM PST US From: Art Zemon Subject: Re: AeroElectric-List: Regulator location Dan, I installed B&C Aero regulators. The installation instructions specifically state that they are to be installed on the cockpit side of the firewall, not in the engine compartment. -- Art Z. On Fri, Sep 23, 2022 at 8:49 AM dj_theis wrote: > > I=99ve been trading emails with another builder and they asked my t houghts > on the location of the ship=99s voltage regulator. =9CWhat a re the pros and > cons to mounting the regulator on the occupant side of the firewall. =9D > > My thoughts are below but I think this is a question better served by thi s > forum than my opinion. > > Pros: > Likely cooler environment (although you might not appreciate the added > heat in the summer). > > Cons: > Harder to find blast air for cooling > The high voltage AC wires are routed through a longer path (65 VAC open > circuit) > I=99ve never seen this done on certified aircraft or land vehicles. (Maybe > not a good reason but something to consider) > If they do go up in smoke you will be breathing that smoke. > > Can the forum comment additionally? > > Thanks, > > Dan -- My blog: CheerfulCurmudgeon.com *=9CWe are all visitors to this time, this place. 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