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2 engines 2 props?

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HeliDev

Well-Known Member
Joined
Jul 7, 2003
Messages
108
My helo desing is going to require a bit of power, in the order of 200hp. Ive been thinking that perhaps instead of using one 200hp+ engine, using 2 smaller ones. I know that there will be a weight peanalty, but there are some advantages as well, OEI performance for one.
One thing I have been thinking about though is using two props instead of one.
How much would I be able to reduce my prop diameter by? For example if I was using one 50in prop, could I drop to 2 25s? I know the relationship wont be linear, but how closae is it?
Thoughts appreciated
 
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