Prop advice

2017 mercury 25hp on tracker grizzly 1648

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Johnsk
Posts: 23
Joined: 20 Sep 2019, 15:33

Prop advice

Post by Johnsk » 07 Oct 2019, 07:20

Running a tracker 1648 (2018) mercury 25hp. Original prop was 9.5x11 stock got 5200-5300 rpm and 22-23mph wot , mercury prop selector tool said use a spitfire 4 blade 9.3x11, took boat out over weekend always run 2 guys 2 batteries and trolling motor and fishing gear . 5800 rpm 24-25mph , Is this the best I will get with this set up?

turbotodd
Posts: 1167
Joined: 24 Dec 2011, 22:06
Location: 72032

Prop advice

Post by turbotodd » 07 Oct 2019, 07:45

Put a SS 3 blade 11" on it and it should pick up some RPM. Might even have to go to a 12" depending on how much it picks up. Going a little over 6000 is fine as long as it ain't on the limiter all the time.

Johnsk
Posts: 23
Joined: 20 Sep 2019, 15:33

Prop advice

Post by Johnsk » 07 Oct 2019, 08:36

Thank you for the reply I thought about the stainless steel prop but they were over 300$ the whole shot with a four blade was night and day over the stock prop I think I might just save the money and put a 40 hp on it. Really thought I would get closer to 28/29mph with the 25hp, best advice on this forum buy the max hp your boat is rated for!

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DaleH
Donor
Posts: 2381
Joined: 12 Dec 2014, 14:32
Location: Eastern Mass

Prop advice

Post by DaleH » 07 Oct 2019, 10:37

Did you ever run your rig through the Prop Calculator listed as a sitcky post on the Motors forum?

FWIW the Turning Point 'pressed aluminum' 4-blade props give SS performance at a fraction of the price (< $100). Plus with their props you are never stuck, as they swap them out until you get exactly what YOU need and/or want.

That said, I doubt you'll ever see close to 30mph with a 25hp on that rig as configured ... less on the trailer :lol: ... LOL!
#1) 1st tin rebuild, 18' Lund http://forum.tinboats.net/viewtopic.php?f=21&t=36583
#2) 25' Parker refurb from EMPTY hull http://www.classicparker.com/phpBB3/vie ... p?f=15&t=6
#3) 16' V-tin rebuild http://forum.tinboats.net/viewtopic.php?f=21&t=36465
#4 Procraft SV14
#5) 16' Starcraft entirely NEW Transom Skins http://forum.tinboats.net/viewtopic.php?f=3&t=37548

Johnsk
Posts: 23
Joined: 20 Sep 2019, 15:33

Prop advice

Post by Johnsk » 07 Oct 2019, 11:13

I did try turning point it said they didn’t have any props for my motor and your right can’t hit 30mph with just me

turbotodd
Posts: 1167
Joined: 24 Dec 2011, 22:06
Location: 72032

Prop advice

Post by turbotodd » 07 Oct 2019, 17:55

With that 4 blade you might be able to lift the engine on the transom and it still bite (depending on the prop, hull, etc). The 4th blade generally will pull a MPH or so out of it, the extra blade has a little drag. I think if you could lift it a little and play around with the setup, you should see 30 with a light load. The more you load it the more it's gonna slow down, and that's a big hull already for 25hp. The 40 outta run 30 probably not much more though-remember-it's heavier which offsets some of the extra power. Have you considered a jack plate, PT&T or breakaway? Those would lift it and move it back and in the case of the PT&T (CMC is popular brand), you get that extra benefit of power tilt/trim. Most that install them see 2-5 mph improvement after playing with it. I want one; can't justify the cost right now with everything else going on.

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