Last year I ended up buying or horse trading for a B/S X646/3 for my 29" Sprint Cat that is a dedicated 6s boat. On paper, the pitch and diameter looked pretty good so I went ahead and grabbed it. The prop showed up and seeing it in person was a whole different story. While the prop was perfect (no complaints with the seller), it was quite a bit larger in pitch and overall blade surface than I was expecting. I normally run an M545 or X448 and the X646/3 is huge in comparison!
Needless to say, things got cool last Fall and the dock got pulled where I normally run my boat. I never had a chance to run things to give it a try. Looking at this big honking prop is giving me concern about being too much pitch/ blade surface.
My setup is a 1600 kv Leopard 4082 with 5.5 mm bullets used for the motor to esc, and battery to esc connections. ESC is a Sea King 180 v2. Batteries are 2x Nanotech 45c, 5000 mah, 3s packs wired in series for 6s. Normal runtime for the M545 is 2:15 with remaining cell voltage (no load) 3.75 volts on average.
Temps are usually in the 90 degree range for the ESC, and 120's for the motor after a 2:15 run. Average summer temps for the lake is in the low 80's so I don't get much cooling effect in July/ August. Temps are better in May/ June before the water gets too warm.
Will the X646/3 be too much prop, or will I be OK?
As always, thanks for the input.
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