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I'm not sure on a mechanical gearing onto the main engine crankshaft and packaging this into the airframe. Instead, how about no supercharger on the main engine = power boost from reduced load, and reduced size/mass. Then use the auxiliary engine as variable speed/power to drive a supercharger and then duct the air forwards into the main engine. Still going to need a decent power secondary engine though I think e.g. dH Gipsy 6 for 200hp.Or go for two common engines side by side through a common gearbox to drive one propeller each as per MC.72? Avoiding the complexity of a high power gearbox.
I'm not sure on a mechanical gearing onto the main engine crankshaft and packaging this into the airframe. Instead, how about no supercharger on the main engine = power boost from reduced load, and reduced size/mass. Then use the auxiliary engine as variable speed/power to drive a supercharger and then duct the air forwards into the main engine. Still going to need a decent power secondary engine though I think e.g. dH Gipsy 6 for 200hp.
Or go for two common engines side by side through a common gearbox to drive one propeller each as per MC.72? Avoiding the complexity of a high power gearbox.
