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Old 08-24-2023, 08:09 AM
hk1232's Avatar
hk1232 hk1232 is offline
Join Date: Jan 2022
Location: Minneapolis, MN
Posts: 13
Default Rotax 915iS + Extra weight to change CG

Someone tell me why the Rotax 915iS in an RV-9 (like the Lockwood demo) always propose extending the forward position rather than adding weight to align more closely with the heavier Lycoming.

I understand lighter is better, but if there are downsides of the lighter engine isn't this a reasonable approach to normalizing the CG?

The Rotax is 185 lbs and a Lycoming 320 is 244 lbs. A 2" x 8" lead disc would come close to zeroing it out. I haven't done any FW forward work yet but that doesn't seem like it would be a space issue.
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