Prop Recommendation: Honda B75

[mullet]

Hi all,<br /><br />I've recently aquired a sweet older Honda B75 and I am wondering about switching from the 2-blade prop (which I believe to be the original) to a 3-blade aluminum prop. I am told this would give me some additional power. It would also give me a spare to keep for emergencies (the original prop, that is).<br /><br />Unfortunately with all the prop options out there I have become quickly confused as to what the appropriate choice would be.<br /><br />The motor sits on a 10'2" Zodiac Serie 131 inflatable (the SS Blutarski) that is primarily used for fishing and touring lakes. <br /><br />Any opinions would be appreciated.<br /><br />john

 

[Navigator]

Re: Prop Recommendation: Honda B75

mullett,<br /><br />If the 2 blade is running in the correct WOT (wide open throttle) range for the motor, switching to a three blade wont be a problem. If you are currently running in the very low range of WOT on your rig, you may want to consider droping down an inch in pitch with the 3 blade.<br /><br />Theoretically, a 2 blade is more efficient than a 3 blade because each blade bites into more "clean" water. In real life terms, a 3 blade should give you a bit more hole shot but a bit less top end, assuming the same pitch. On your 7.5, this isn't really going to make a whole lot of difference.<br /><br />I'd go for the 3 blade of the same pitch, and keep the 2 blader for a spare. This should give you a little more kick while trying to plane out. (but honestly, dont gets your hopes up...its really not that noticable )<br /><br />Enjoy<br />Nav

 

[Bear]

Re: Prop Recommendation: Honda B75

The 3 blade "too low pitch" sailboat propeller<br />9 1/4 x 7"<br /> http://boatingsolutions.com/AB1430/showdetl.cfm?&DID=6&Product_ID=204&CATID=1 <br /><br />QA 3150R Black Diamond 9 R 10 Alum 3 blade All Purpose <br />QA 3152R Black Diamond 9-1/4 R 11 Alum 3 blade All Purpose <br /> http://www.a1discountprop.com/qusi-hondaob.htm <br /><br />For your inflatable you need the larger pitch. (As you probably already know )

 

[mullet]

Re: Prop Recommendation: Honda B75

Navigator, Bear -- thank you! <br /><br />The price on those Black Diamonds is pretty good compared to what I've been quoted from the shops around here.<br /><br />Unfortunately I'm not sure what the WOT range for a old B75 is supposed to be, and as I don't have a tach I'm not sure how to check it on the water. (Forgive me, I'm new to this whole outboard business -- steep growth curve for the mechanically disinclined ). Maybe the ol' multi-meter would work...<br /><br />The motor runs very well, and I'm pretty certain the 2-blade prop is the original, so I'm assuming a prop swap to a three blade is going to work out fine. Maybe I shouldn't assume though...

 

[MajBach]

Re: Prop Recommendation: Honda B75

Whew! I glad that got cleared up. I was trying to picture a 10' zodiac becoming airborne with a seventy-five HP 360lb motor!

 

[neilgreen_uk@yahoo.com]

Re: Prop Recommendation: Honda B75

Hi Mullett<br />Do you know when the B75 was being made & how available parts are in UK ??<br />Neil