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Thread: Light weight alternator

  1. #1
    Charlie Longley's Avatar
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    Light weight alternator

    What’s everyone using for an alternator to keep the weight down? My Super Cub project has a generator which I am going to switch out.

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    skukum12's Avatar
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    Been using a BnC for about 17 years now on the O320. No issues, no sqwauks. About 1100 hours or so.
    "Always looking up"
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  3. #3
    Charlie Longley's Avatar
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    Quote Originally Posted by skukum12 View Post
    Been using a BnC for about 17 years now on the O320. No issues, no sqwauks. About 1100 hours or so.
    The belt driven one? I am looking at it with their starter.
    Last edited by Charlie Longley; 09-13-2020 at 08:42 PM. Reason: typo

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    buy a DENSO----1600 hrs on RV-8---same alternator--jnternally regulated---40 amps--no problems---


    "You cannot teach experience, you must acquire it."
    Captain Cub
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    Charlie Longley's Avatar
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    Quote Originally Posted by yellowbird69 View Post
    buy a DENSO----1600 hrs on RV-8---same alternator--jnternally regulated---40 amps--no problems---
    It’s certified airplane and I don’t want to chase a field approval.

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    I like the Denso $130, and the BanC mounting kit for $65,. 200 bucks total. I think some states have defunded the FAA and the police for the peaceful protesters so with no police or FAA I think the Denso is fine on certified.
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    skukum12's Avatar
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    Quote Originally Posted by Charlie Longley View Post
    The belt driven one? I am looking at it with their starter.
    Yup, starter too.
    "Always looking up"
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    OldCuby's Avatar
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    Will the B&C with mounting kit fit with the front oil cooler (Niagara) on my '63 O320 SC? My engine mechanic had no luck with the Plane Power.

    Sent from my SM-T827R4 using SuperCub.Org mobile app
    Jim Newton
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    wireweinie's Avatar
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    Quote Originally Posted by OldCuby View Post
    Will the B&C with mounting kit fit with the front oil cooler (Niagara) on my '63 O320 SC? My engine mechanic had no luck with the Plane Power.

    Sent from my SM-T827R4 using SuperCub.Org mobile app
    I believe that any of them with the front mount cooler will require reshaping one leg of the cooler. Not really a big deal.

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    I’ve got the B&C L40 with external regulator along with a Skytech XL lightweight starter on my O-235 powered PA-16 with Field approval. If you go with the Denso internal regulated, you can’t use an EarthX battery, so plan accordingly.


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    wireweinie's Avatar
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    The L40 is now called the BC400 when installed on certified aircraft. It's name was changed when it was STC'd

    Although I don't put automotive alternators on aircraft, why wouldn't you be able to use an EarthX battery with one? The usual limitation is that the battery needs to be big enough to handle the output of the alternator.

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    Does an internally regulated automotive alternator have a crow bar over voltage protection circuit? The EarthX is sensitive to overvoltage issues where as the lead acid battery has resiliency.
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    What about accessory case alternators? B&C makes them. Mine works well. Field approvable?
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    wireweinie's Avatar
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    Quote Originally Posted by stewartb View Post
    What about accessory case alternators? B&C makes them. Mine works well. Field approvable?
    I usually sign them off as meeting the requirements of CAR3. I did get a field approval for the Plane-Power direct drive model and others have gotten field approvals for the B&C.

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    Not a lot of weight savings going to b&c belt drive and you need to switch power on and off. B&C rear mount field approved is where you will save the most and no oil cooler issues

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    Charlie Longley's Avatar
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    Quote Originally Posted by dirthog4 View Post
    Not a lot of weight savings going to b&c belt drive and you need to switch power on and off. B&C rear mount field approved is where you will save the most and no oil cooler issues
    There would be a lot of weight saving because I am replacing a generator.
    I am considering the accessory pad model as well though.

  17. #17

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    Have a nephew that replaced generator on a pa12 not worth the price and a days worth of labor Like 600.00 or so for a pound

  18. #18
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    I got a plane power field approved when you used to be able to do that. And “belt pulley removed from flywheel” and I think it mentioned an earthx battery in there too.


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  19. #19
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    Quote Originally Posted by dirthog4 View Post
    Not a lot of weight savings going to b&c belt drive and you need to switch power on and off. B&C rear mount field approved is where you will save the most and no oil cooler issues
    Different situation but I still have the stock 35A generator on my 1953 C180.
    I like it & see no need to change to an alternator.
    If I did, what I'd like to do is to install one of those tiny B&C alternators that mount on the vacuum pump pad.
    I think it puts out plenty of juice for my minimal VFR-only needs.
    But 1) it's too long, so there would be firewall clearance issues.
    and 2) my experience is that the Seattle FSDO is not field approval friendly (!!) nowadays.
    Cessna Skywagon-- accept no substitute!
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