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| Prop size and ratio https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=41&t=53444 |
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| Author: | Stevenc386 [ Thu May 22, 2014 7:50 pm ] |
| Post subject: | Prop size and ratio |
I have built a surface drive with a predator 13.5. I purchased a hill marine 8x4 and started with a 1 to 1 ratio. It just didn't perform like I wanted maybe 12 mph I'm pushing a 1648 I know I need more hp but for now my budget only allows me to have this set up. I have since reduced my ratio to 1.60 to 1. What prop size do you guys think I can push now? Thanks |
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| Author: | 50fps [ Fri May 23, 2014 1:42 pm ] |
| Post subject: | Re: Prop size and ratio |
Your RPM will determine what pitch you need with the new ratio. |
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| Author: | LA Prop [ Fri May 23, 2014 5:24 pm ] |
| Post subject: | Re: Prop size and ratio |
Did they sell u a long tail prop if so that will have a lot to do with how it runs_ |
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| Author: | 2500 [ Fri May 23, 2014 8:18 pm ] |
| Post subject: | Re: Prop size and ratio |
I have a homemade surface drive on a 16x48 with a 16hp predator that is stock and I started with a 8x6 long tail prop and got 12mph max with a 1 to 1 ratio and alot of slip. Today I got my new 10x8 hill marine surface drive prop put on and went to the river for a test run with a 1 to 1.3 ratio I got 18 mph but I was not able to get the rpms up so im going to a 1 to 1.6 ratio. Both test runs were done with two people and fishing gear. My boat is a 1973 lowe so its built well. |
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| Author: | Mag10 [ Tue May 27, 2014 11:32 am ] |
| Post subject: | Re: Prop size and ratio |
The last motor I built was a 16 hp with a 1.5:1 reduction slinging a Hill Marine 10X8. It spins the 10X8 with no problem and could probably be geared more in the 1.35:1 or so. On the 13 hp I would stick with 1.5:1 reduction and a 10X8. Getting a surface piercing prop on your build will make a big difference. Less drag with a smaller amount of outdrive in the water. Post up some pics of your build if you get a chance. Mag10 |
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| Author: | Stevenc386 [ Tue Jun 03, 2014 8:03 pm ] |
| Post subject: | Re: Prop size and ratio |
thanks for the info I will post some pics soon. |
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| Author: | Stevenc386 [ Tue Jun 03, 2014 8:08 pm ] |
| Post subject: | Re: Prop size and ratio |
where is the best place to get a surface piercing prop? thanks |
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| Author: | LA Prop [ Wed Jun 04, 2014 7:08 pm ] |
| Post subject: | Re: Prop size and ratio |
| Author: | Mag10 [ Thu Jun 05, 2014 10:55 am ] |
| Post subject: | Re: Prop size and ratio |
I have had pretty good luck with Hill Marine. |
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| Author: | LA Prop [ Thu Jun 05, 2014 8:03 pm ] |
| Post subject: | Re: Prop size and ratio |
Yea they got some good stuff I'm a hill dealer they are very easy to deal with and they are very knowledgeable. And their prices are very reasonable |
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