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Engine Selection - weight ?

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Jerry

Radial Skybolt Builder: 220.45% completed
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How can one determine the max weight foran airplane's engine ?


The radial version of the Skybolt was designed for the Ven M14, which is 470 - 485 pounds. The original Skybolt was designed for a 180 hp engine and now they're flying with 350 hp engines.


I'm told that the P&W, which weighs in at 560 - 680 pounds is way too much weight.


Looking at other radial engines I'm finding weights of:
Jake 755: 415 - 557 pounds
Lycoming R680: 505 - 523 pounds


Do I need to do a sample weight and balance to determine if an engine will work ?
 

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