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You are getting multiple answers because fast electrics do not follow the laws of mathematics. In many cases one plus one does not equal two. what works on one boat will not directly translate to the same performance on another. The state of charge of the batteries, the size of the connectors, the amount of power loss due heating wiring all contribute to what you see at the propellor.
When judging a suitable prop diameter and pitch we generally tend to experiment starting with less than what we want as an end point to see what effect the chosen prop has on the rest of the boat's components. You say that you do not wish to buy a bunch of $50.00 props, well think another way is a few props going to exceed the cost of a baked ESC or motor? Also when an ESC fries it can take your new boat with it. Better to err on the side of caution as you choose a new propellor.
As Roland has already stated you can buy props for less than $20.00 and balance or detongue them to get an idea of what specs you need. You can then purchase a better quality prop with similar specs. Some even experiment with cheap plastic/carbon props when choosing an ideal prop and then purchase a metal prop with the required specs.
Without the possibility of failure you cannot simply purchase one prop to upgrade your new boat to achieve a specific speed. If you look back over the forum there was one member with a seemingly huge wallet who wanted to buy himself a 100 plus mile per hour boat basically off the shelf. He was not prepared to build up to that speed, he just wanted information on every specific item he needed to reach the magical ton out of the box. Appears that he may not have accepted the advice of the forum as he has been very quiet for some time now.
When judging a suitable prop diameter and pitch we generally tend to experiment starting with less than what we want as an end point to see what effect the chosen prop has on the rest of the boat's components. You say that you do not wish to buy a bunch of $50.00 props, well think another way is a few props going to exceed the cost of a baked ESC or motor? Also when an ESC fries it can take your new boat with it. Better to err on the side of caution as you choose a new propellor.
As Roland has already stated you can buy props for less than $20.00 and balance or detongue them to get an idea of what specs you need. You can then purchase a better quality prop with similar specs. Some even experiment with cheap plastic/carbon props when choosing an ideal prop and then purchase a metal prop with the required specs.
Without the possibility of failure you cannot simply purchase one prop to upgrade your new boat to achieve a specific speed. If you look back over the forum there was one member with a seemingly huge wallet who wanted to buy himself a 100 plus mile per hour boat basically off the shelf. He was not prepared to build up to that speed, he just wanted information on every specific item he needed to reach the magical ton out of the box. Appears that he may not have accepted the advice of the forum as he has been very quiet for some time now.
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