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  #11  
Old 01-05-2018, 11:59 PM
chriscencula chriscencula is offline
 
Join Date: Mar 2008
Location: Northern California
Posts: 52
Default

FWIW, the B&C starter employs a ?series field" - as does the Skytec 'NL' 'inline ' starter.

I'm in the midst of an investigation/study to characterize the current requirements of various starter models.

Based upon some measurements of the Skytec 149LS series on an O360-A1A, the first compression stroke typically requires 400 amps or more to get past TDC. I've measured two different starters on the same model engine with different batteries and wiring feeding the starters. Both starters had quite similar cranking current profiles.

Would be interested in making similar measurements on other starters - if anyone reading this in the Sacramento has a different model Skytec (different than the 149LS) and is interested in helping, please let me know. I'm also seeking someone in the area with a B & C for the same type of measurement.

Measurement of the current profile consists of putting a "clamp on" (really better described as a "clamp around") current meter around a conductor carrying current to the starter. The engine is then cranked through 2-3 revolutions with the mags off, during which time the current profile is recorded.
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  #12  
Old 01-06-2018, 08:51 PM
Sodbuster Sodbuster is offline
 
Join Date: Mar 2010
Location: Danville, IN
Posts: 31
Default Skytec starter question - NL vs XLT

Years back my friend and I (both Rockets) were having trouble starting as well as several RVs on the field. We were all using the Skytec LS starters (in my opinion is junk). I was using an aftermarket Concord 25 size RG battery. On my Rocket I ran the battery down cranking till it wouldn't turn with the LS starter (didn't take long). I then put a B&C starter on, it cranked 2 or 3 blades and it was done. I then put on a Skytec NL starter. It cranked like a fresh battery. Several pilots were watching and all put on NL starters. There is a reason. The LS is a permanent magnet motor (which takes more amperage to start) with a 3.7 to 1 reduction gear. The NL has a series wound motor and a 6.5 to 1 reduction. If you want more details, give me a call at 317-718-3415.
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