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Posts: 8
| Hello guys I have new Yamaha f50 on a Ranger 680t I bought. I have no prop yet and need to buy one. Thinking 4 blade for stern heavy boat with only 50 hp maybe 12 pitch? If anyone has any experience with similar setup I would love to hear about it thx.
Edited by Tomkat 5/21/2019 7:39 PM
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Posts: 3469
Location: Elk River, Minnesota | Hiya,
This is only going to be a ballpark estimate just from what I could gather on a little research...
The boat weighs 800 pounds on it's own, so adding the motor (250), batteries (assuming 3 @ 50 pounds) a trolling motor (40), 20 gallons of fuel (120) you are looking at a rig that is roughly around 1300 to 1400 pounds... If the boat doesn't have an onboard tank (it was optional some years from what I could gather) that would maybe reduce the fuel weight by half... so you'd be around 1300 at most.
The gear ratio of the motor is 1.85:1 so I would think you are looking at either a 13 pitch or an 11 pitch for your motor. My gut instinct says the 11 is going to be closer overall. With that rig, you might find an 11 pitch 4 blade as a good choice to help try and get the rear of the boat up with some ability to trim the bow...and...you might be able to raise the motor off of the transom a bolt or possibily 2 without any real loss of handling.
The boat will not be a fast boat by any means, but with the right prop, it will handle and perform well for you.
Steve |
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Posts: 8
| Thx for that. I would have rather got the 60hp but got a great price on the 50 so I’ll see how it does I would be happy with 30 mph if I get that. I had a Lund 1650 explorer ss with a 50hp and could get 31-32 mph and it was a similar size and weight. If I remember correctly I had a 12 pitch black max prop on that boat |
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Posts: 44
| I had until recently a 681T with a carb 60 HP Yamaha. That version has the bigger fuel tank in the front of the boat. Put a Power Tech 4 blade SST on it, and the prop was too big. On the road for work, will look on Friday what size it was. While too big, the Power Tech prop handled very well and definitely made the boat run better plus was much easier with the tiller handle torque. The reps that answer the phone at Power Tech were very helpful. |
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Posts: 8
| Thx Goaliedad |
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