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Old 05-05-2018, 08:12 PM
vernon smith's Avatar
vernon smith vernon smith is offline
Join Date: Jun 2017
Location: Naples FL
Posts: 145
Default Blown "2 amp start fuse"

We did some checking and found the Rotax solenoid has 4.2 ohms resistance. then put an amp meter in the fuse position and get 2.2 amps draw during cranking. These numbers jive pretty well with Mr. Ohms law so the question is, should the start fuse be larger or am I developing a bad solenoid?

We could not find any specification for the Rotax solenoid but all the other solenoid specifications we were able to find would draw more amps than the Rotax.
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Old 05-05-2018, 08:25 PM
DHeal DHeal is offline
Join Date: Sep 2006
Location: Windsor, California
Posts: 756

I believe that Van's approved a 3 amp fuse for the starter circuit several years ago -- check with Van's techs. My circa 2013 RV-12 plans depict a 3 amp starter fuse. I have had no problems with this 3 amp fuse.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 725+ hours (as of Jan 2019)!
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Last edited by DHeal : 05-05-2018 at 08:29 PM.
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Old 05-05-2018, 08:27 PM
skydiverlv skydiverlv is offline
Join Date: Jul 2008
Location: kansas
Posts: 294

Larry Vandegrift
ULPower 260is
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