Another prop question
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Another prop question
So our top speed is 12 mph @ 5800rpm with a fairly light boat ( need to weigh her) michigan prop recommends Michigan Wheel Vortex 13-7/8" x 11 RH 941411 boat prop.
I have no idea what is on boat now, but damn we are just way too slow, i can drop to cruise rpm about 4600 and it is still 10 mph speed checked with 2 phones and chart plotter
Engine is 1990 2 stroke suzuki DT90...I should be closer to 20 mph right? O
I got past by a pontoon and 6 people last weekend with a 50 merc on back....
I have no idea what is on boat now, but damn we are just way too slow, i can drop to cruise rpm about 4600 and it is still 10 mph speed checked with 2 phones and chart plotter
Engine is 1990 2 stroke suzuki DT90...I should be closer to 20 mph right? O
I got past by a pontoon and 6 people last weekend with a 50 merc on back....
Check out "Dudes" site www.whereisdude.com
Re: Another prop question
I have had very good results with Michigan prop suggestions to get to WOT RPM. If you're running a clean prop at 5800 RPM, I would wonder about prop depth from what I have read. Do you get easy blowouts while in a tight turn? If so, I would wonder if the prop isn't deep enough. Otherwise I would suspect too deep. I would think too deep would be more likely, but...
I am just thinking out loud.
I am just thinking out loud.
Last edited by urbnsr on Tue Jul 17, 2018 6:30 pm, edited 1 time in total.
Paul
Re: Another prop question
I notice if i trim up even a little bit it gets real loud ,either ehaust ie prop out of water, trimming all the way down does nothing to bow ht or speed.
I hope to get down to boat after work tomorrow and get prop numbers and see how it sits stationary and then compare to under way, engine could be too high which explains trim issue
I hope to get down to boat after work tomorrow and get prop numbers and see how it sits stationary and then compare to under way, engine could be too high which explains trim issue
Check out "Dudes" site www.whereisdude.com
Re: Another prop question
Also to after reread, it may be too high, i get a pretty big rooster tail
Also it will rev higher very easily, i limit it at 10 mph which gives me no over rev.
So more pcs of puzzle, thanks for insight!
Also it will rev higher very easily, i limit it at 10 mph which gives me no over rev.
So more pcs of puzzle, thanks for insight!
Check out "Dudes" site www.whereisdude.com
Re: Another prop question
Sounds like it's too high like others are saying. Also check to make sure RPM reading is accurate.
2008 South Bay 825CLR
2011 Yamaha F150TLR
2011 Chevy Silverado
2011 Yamaha F150TLR
2011 Chevy Silverado
Re: Another prop question
Tell me about the boat---is it rated for 90---or larger motor? Length, number of toons, weight, etc. If trimming up does nothing-you may be underpowered or too much weight in front of boat, etc..... FYI---I have 20ft Lowe 25in toons, 2 fishing seats up front-90 HP Merc Optimax, Merc SS prop 13 x 16in prop 27mph GPS
2009 LOWE SS204 25in logs
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
Re: Another prop question
no idea on engine, it is original according to titles and paperwork I havewwind3 wrote: ↑Tue Jul 17, 2018 4:46 pmTell me about the boat---is it rated for 90---or larger motor? Length, number of toons, weight, etc. If trimming up does nothing-you may be underpowered or too much weight in front of boat, etc..... FYI---I have 20ft Lowe 25in toons, 2 fishing seats up front-90 HP Merc Optimax, Merc SS prop 13 x 16in prop 27mph GPS
1990 Suzuki DT90
24 ft, 2 pedestal seats up front, no furniture (we use folding camp chairs) normal fuel load is about 15 gallons, 2 batteries, composite deck floor (about 250# more than marine ply and carpet) that about it
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Check out "Dudes" site www.whereisdude.com
Re: Another prop question
What HP is it rated for ? Being a 24 ft boat is most of your problem. That's why trimming the motor has no effect-or very little. My boat sits with rear down so it tends to try to get on plane better...as you can see I'm still throwing a LOT of water at 27mph--but trimming does increase speed a lot....I can trim my motor up a lot before it blows out....I cruise at 18-19 mph at 4000-4200 rpms. Redline on my motor is 5850 rpms
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2009 LOWE SS204 25in logs
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
- curtiscapk
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- Location: OP KS\Hillsdale Lake
Re: Another prop question
Looks really high... maybe you should notch it like mine...
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Craig and Paula
"THE FLOATER" rebuild Spring 2013
viewtopic.php?f=2&t=15328
94 Party Barge 24' 115 merc
Turning Point hustler 14 x 13 prop
22mph gps 3 people
12 F150
Overland Park Ks
Hillsdale Lake, KS
"THE FLOATER" rebuild Spring 2013
viewtopic.php?f=2&t=15328
94 Party Barge 24' 115 merc
Turning Point hustler 14 x 13 prop
22mph gps 3 people
12 F150
Overland Park Ks
Hillsdale Lake, KS
Re: Another prop question
Been reading today and are pontoon boats that much different than flat and v boats?
Everything points to make sure the ventilation plate is barely skimming surface, if that is true i would have to raise my engine? (From memory), the area above vent plate is more rounded thus if it is under water it is drag and splash back.....i hate when the rabbit hole splits off....
Hopefully this weekend i can get pictures while wifey drives, still need to check prop also
Everything points to make sure the ventilation plate is barely skimming surface, if that is true i would have to raise my engine? (From memory), the area above vent plate is more rounded thus if it is under water it is drag and splash back.....i hate when the rabbit hole splits off....
Hopefully this weekend i can get pictures while wifey drives, still need to check prop also
Check out "Dudes" site www.whereisdude.com
Re: Another prop question
Okay checked prop, it is aluminum 3 blade, 13.25 x 17
So is the aluminum 4 blade 13.875 x 11 the right choice? seems to be big difference between pitch altho I would have an extra blade....
No wonder there are 1 gazillion threads on props across the interwebz
So is the aluminum 4 blade 13.875 x 11 the right choice? seems to be big difference between pitch altho I would have an extra blade....
No wonder there are 1 gazillion threads on props across the interwebz
Check out "Dudes" site www.whereisdude.com
Re: Another prop question
Yep--raise engine so that plate is even with bottom of mounting pod---which may be hard to do with your transom.. Your boat is too long to trim up enough to get your toons out of the water,,, would take a bunch more horsepower. Show us pics with your new setup.. Good luck.bansil wrote: ↑Wed Jul 18, 2018 3:48 pmBeen reading today and are pontoon boats that much different than flat and v boats?
Everything points to make sure the ventilation plate is barely skimming surface, if that is true i would have to raise my engine? (From memory), the area above vent plate is more rounded thus if it is under water it is drag and splash back.....i hate when the rabbit hole splits off....
Hopefully this weekend i can get pictures while wifey drives, still need to check prop also
I had mine out today--26 mph at 5800 assuming tach is correct. Cruising at 18 mph and 4000 rpms....
2009 LOWE SS204 25in logs
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
Re: Another prop question
bansil wrote: ↑Wed Jul 18, 2018 3:48 pmBeen reading today and are pontoon boats that much different than flat and v boats?
Everything points to make sure the ventilation plate is barely skimming surface, if that is true i would have to raise my engine? (From memory), the area above vent plate is more rounded thus if it is under water it is drag and splash back.....i hate when the rabbit hole splits off....
Hopefully this weekend i can get pictures while wifey drives, still need to check prop also
Yep--raise engine so that plate is even with bottom of mounting pod---which may be hard to do with your transom.. Your boat is too long to trim up enough to get your toons out of the water,,, would take a bunch more horsepower. Show us pics with your new setup.. Good luck.
I had mine out today--26 mph at 5800 assuming tach is correct. Cruising at 18 mph and 4000 rpms....
2009 LOWE SS204 25in logs
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
90 Merc Optimax
Motorguide W55 Wireless
Underskinning
28 GPS
Re: Another prop question
How do i know if i need a hub kit
Check out "Dudes" site www.whereisdude.com