Quote:
Originally Posted by moosepileit
Looking at switching to an IR model and adding OVP to it.
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It's basically pointless to add OV protection to an automotive-style IR alternator, as shutting off power to the field wire (which is what the OV protection does) will not stop the OV condition.
With an IR alternator, a failure mode exists where it "feeds itself" and rather than using external voltage from the field wire. This failure mode does not exist in externally regulated alternators, hence the reason they are used in aircraft.
A caveat is the PlanePower IR alternators which have eliminated this failure mode. There may be others but I'm not aware of them.
Yes, automotive alternators are cheaper but you do have this risk.
__________________
Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.
VAF Advertiser -
Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
Linear Mode
