Originally Posted by waynes world
Very interested in the propellers could you tell about them, are they hand made or readily available to buy, where from etc , I know about the web site on the wire but no real info on technical side.
Some tethered hydroplane competitors buy the cast props and tweak them but have seen them bend.
Many of the high performance competitors make their own out of steels like EN24T.
Mine is 4 inches in diameter out of HT steel I start by milling the root angle then twist the blade with something on the lines of a large tap wrench to the angle I require.
A template of the blade shape is then scribed on the rough blade.
With a series of angle gauges I proceed to hand finish with power and hand tools the required angles at various diameters on a jig I made.
Cupping etc. is then done, rear angle is critical to how it runs in the water the rooster tail give various clues when flat out.
My props are highly polished and razor sharp so extreme care is required to avoid injury.
Have been told that some of the fastest full size racing props are hand finished for that extra speed.
Roughed out prop on jig