Hello Gentlemen,
I've been punching some numbers into Hughs spreadsheet, aiming for a 7 TSR, 2 meter, 2 blade prop, 5 degree angle of attack.
Since I'm using a lower number of blades, this means they get thicker towards the root as compared to 3 or 4.
My question is how much wood can I comprimise by going with a slightly thinner root?
Here are the numbers:
First 3 stations (of 10) call out for 293 mm , 273 mm , 211 mm. Then it gradually tapers down to 71 mm upwards of the 3 station (4th station is 167 mm).
I would like to keep the total width at 200 mm. In other words, the blade will have the same width from the third station all the way down to the root.
Second, how much of the blade root goes "inside the hub" . Do I have to add this to the total length of the blade in order to have a useful diameter of 2 mt in the wind?
How do I interpet "drop"?
Thanks,
Warrior