Quote:
Originally Posted by RV6-KPTW
Scott,
Is the IO360 200hp really a good choice? I have a really smooth A1D and a whirlwind prop (RV200) sitting in the wings if so. Weight is close for the engine, the prop is quite a bit lighter. I question the extra horsepower of the 390 - is the extra 10hp desired or needed?
Appreciate your thoughts.
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Is the extra power desired? You have to answer that one your self.
Is it needed? No. Particularly for a builder that can resist adding a lot of un-needed weight (full leather interior, etc.)
The 390 was chosen because of the desire to design a larger 2 place SBS RV (with more range, baggage space, etc.) but still have about the same overall performance as an RV-7. If you desire that, then the full 210 HP is needed.
BTW, in reality the IO-390 is about 15 HP more.... my understanding is that even though the IO-360 is
rated at 200 HP, a stock, unmodified one will usually dyno at about 195 HP.
But if that level of power will meet your needs, the angle valve IO-360 will be a good engine choice.
Without making some other changes to compensate for W&B, a lighter weight prop (particularly on the slightly lighter IO-360) will cause some loss in utility in regards to your ability to fill that larger baggage compartment.