+- Fishing Forum (https://bigfishtackle.com/forum)
+-- Forum: Utah Fishing Forum (https://bigfishtackle.com/forum/forumdisplay.php?fid=386)
+--- Forum: Boats & Motors (https://bigfishtackle.com/forum/forumdisplay.php?fid=171)
+--- Thread: 2 vs 4 blade prop (/showthread.php?tid=442592)
2 vs 4 blade prop - kochanut - 09-16-2008
quick question. i would assume based on nothing more then the physics that a 4 bladed prop displaces more water then a 2 bladed prop (for a 8 horse kicker that is) but other then that whats the differance? i would also venture a guess and say weight. reason im asking is i was looking over bass pro dot com and noticed they had a sale for evenrude 8 horse motors, 2 bladed props. i bought TS's boat from him, and dont have ready access to call him and ask if he has a spare. has anyone ever noticed a differance when going from these two? i have also noticed from time to time a 2 bladed vs 4 bladed propr on peoples bow mount trolling motor, but i have never seen one on a stern mount motor, why is that? is it simply because a stern mount motor is designed to push the entire weight of a boat and needs the extra blades and a bow drive is to slowly pull the weight of the boat? just curious is all, i saw these things and steam started comming out of my ears from thinking to hard.
[signature]
Re: [kochanut] 2 vs 4 blade prop - bvs - 09-17-2008
You have the basic idea.
A 2-blade prop will have less "grab" in the water but give you more top-end speed due to lower drag. A 2-blade prop would be what you'd want to use for maximum on-plane speed on a flat-bottomed 12' aluminum boat.
4-blade props harness more of the torque out of the motor and are better for accerating a large load quickly. A 3-blade or 4-blade would be much better if you were using the outboard on a 24' deep-v fiberglass boat as a trolling kicker.
4-blade props are comonly used on underpowered i/o boats to help improve the hole-shot when water skiing but sacrifice about 5-10% of top-end speed
I think the main reason bow-mount motors use 2 blade props is that they are only used for slow and easy manuevering while standing on a casting deck and you don't want to end up in the drink.
[signature]
Re: [bvs] 2 vs 4 blade prop - wiperhunter2 - 09-18-2008
Welcome to the site Bvs and thanks for helping kochanut out with his question. It's good to know someone on the site has experience with the different props types. WH2
[signature]