Not being awkward but I have often seen this said but I have never seen any numbers that prove the extra efficiency. Do you have any?
You're not be awkward at all. It depends on choosing the correct pitch and diameter for the model if you go for a bronze prop. I find that you need to speak to Simon or Dan at Protean to get the best one as they know their props and what they are capable of. Get a wrong one and it doesnt really produce more but does look prettier. Get the right one and the performance over a standard brass item is noticable- I'd say between 20-25% more efficenct.
However you do pay for what you get, bronze items are more expensive for obvious reasons- they are cast and from a lost wax method so they have to be made from scratch everytime, and they are made from bronze which is more expensive than brass at times.
The brass props are good, relatively cheap and get you going- you can choose from a wide variety as Ron says and work out diameters and number of blades, etc, for yourself.
I've used both types over the years and I prefer to use brass and bronze over plastic ones, the choice is entirely upto you but the difference is comparable to Formula 1 teams- bronze items are the Mercedes and Ferraris whilst brass ones are Sauber or Renault.
