A GUESS ?

JIM SILVERHEELS · Posted: Thu Dec 27, 2012 5:47 pm Post subject: A GUESS ?

Anyone care to guess how much HP the battery charging coil takes away from a Leopard motor? just wondering as usual
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jeff grose · Posted: Thu Dec 27, 2012 6:21 pm Post subject:

Funny you mention that Jim, I was thinking the same thing last night, why worry about self charging a battery that I keep a float charge a few days prior to a race, besides we use a external starter all the time and pray that the onboard works when needed.
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#31 Gillard/PDBAmerica
IAME Leopards by P1 Engines
Tag Sr./FKCS/WKA
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JIM SILVERHEELS · Posted: Thu Dec 27, 2012 6:39 pm Post subject: MY GUESS

My guess .05 hp. assuming it's got a 3 amp charger.. dont know if it does.

1 hp equals 746 watts so 3 amps times 12 volts divided by 746 would be about .05 hp.
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jeff grose · Posted: Thu Dec 27, 2012 7:14 pm Post subject:

whoa now Jim, I wasn't thinking about it that hard Confused

but if .05 hp is worth 1000th of a sec. I'll take it, Very Happy

just cause I work at the space center don't mean I'm a rocket sciencetist
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jlgracing
#31 Gillard/PDBAmerica
IAME Leopards by P1 Engines
Tag Sr./FKCS/WKA
Driver: Jesse Grose
Remember: "No matter where you go,there you are"

Russell Stevens · Joined: 15 Oct 2012 Posts: 100

That extra power shows up as a TUR-BOW-BOOST on a Rotax. Rotax guys are all sandbagging to keep the weight off... True story!

JIM SILVERHEELS · Posted: Fri Dec 28, 2012 4:35 am Post subject: RUSTY

Rusty, with the Rotax, they're taking the power generated by the coil and feeding it to the starter and then engaging the starter to help the Rotax motor put out more power. A sly trick by the Austrians. our secret
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Russell Stevens · Joined: 15 Oct 2012 Posts: 100

Gotcha, that explains why bendix lasts so much longer than on the Leopard. Learn something new every day, now if you will excuse me I need to swap out my power band, and lube the muffler bearings. Laughing

Brian Degulis · Posted: Fri Dec 28, 2012 3:43 pm Post subject:

I think you might only see a gain when the battery is charging. I'm just comparing it to a belt driven alternator. When the battery is charged and with nothing else drawing power the alternator isn't consuming as much HP as it is when it's putting out. So you might get near the same gain simply by making sure the battery is fully charged.

Brian

KURT RODGERS · Posted: Fri Dec 28, 2012 4:28 pm Post subject:

JIM SILVERHEELS · Posted: Fri Dec 28, 2012 6:18 pm Post subject: Brian

Brian, yer a thinker, the key start RL does have a voltage regulator and as you say, if it's not charging, it aint robbing hp. You may skip any homework assignment tonite me boy !
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