4 and 5 blade props?

[hugo]

that sounds great, thanks for the input. i will definetly try and get my hands on one. i see you stayed with 17 on all three props, im running a 19 now with good resluts is it advisable to stay at a 19 pitch or drop to an 18 or 17 pitch? did your rpm drop when going from 3 to 4 blade as some say it will? im maxed at 5500-5600 now and dont want to drop any more than that. i beleive my motor is rated at 5800 max rpm.