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27hp gdsd too slow?

Author	Message
jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	27hp gdsd too slow? Running at 27 gdsd on a 15X50 allweld. I know it has the crimped bottom, but with just myself (210lbs), a battery, and 6 gallons of gas I can MAYBE touch 21mph...surely I should be running mid 20's correct? I'm wondering if it could be prop wear? The motor is an 09 with 120 hours. Any suggestions/thoughts? _________________ 27 gdsd pushing a 16X48 gd boat
Sun Oct 09, 2011 10:44 pm

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? Well - starting with the prop wear - 2 or 3 blade and when you measure across the widest part of the blade - how wide is the blade ??? (not diameter - but blade width) _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Sun Oct 09, 2011 10:53 pm

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? 3 blade...and it looks like the widest part on one of the blades is 3.5" _________________ 27 gdsd pushing a 16X48 gd boat
Sun Oct 09, 2011 11:16 pm

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? Prop is like new then.... Any tach for checking RPMs.... Have you tried moving weight around - gas tank to front of boat ??? Tried turning the trim knob till about half of prop is surfacing and RPMs come up a bit ??? _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Sun Oct 09, 2011 11:30 pm

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? Running about 3600-3800 rpm at WOT. Tried putting a buddy on the bow, adjusted trim almost every way possible. Still runs about the same. _________________ 27 gdsd pushing a 16X48 gd boat
Sun Oct 09, 2011 11:46 pm

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? Sounds like too much trim or some kind of drag issue with the hull.... When I turn that prop at 3800 rpm - my speed is 28 mph in a GD hull.... _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Mon Oct 10, 2011 6:34 am

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? Yeah, thats about what i figured i'd be running in a 15x50...im all out of guesses. Im gonna take it to a local guy here who builds custom boats and see if he has some input. _________________ 27 gdsd pushing a 16X48 gd boat
Mon Oct 10, 2011 10:15 am

Woodiebuster MMT Elite Member Joined: Wed Mar 03, 2010 7:00 pm Posts: 6060 Location: Choudrant, La	Re: 27hp gdsd too slow? _________________ CSM Custom 18x42 Battleship with a 36 PD beating you to the hole My Rig (Old Motor) viewtopic.php?f=5&t=45193 (New Motor) viewtopic.php?f=5&t=54733 Stumps Fear Me
Tue Oct 11, 2011 4:45 pm

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? The gear ratios are different - but only slightly - no more than 1 to 2mph difference at similar rpms... _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Tue Oct 11, 2011 6:31 pm

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? anything think some float boxes would help my boat run a little faster? im thinking by getting the ass end out of the water a bit, i may pick up a few mph...thoughts? _________________ 27 gdsd pushing a 16X48 gd boat
Thu Oct 13, 2011 11:26 pm

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? I would guess - no... Pods just help from a dead stop to decrease draft which is why they are great in helping an outboard get up in shallow water - they add drag at planing speed - IMO you would get more gains by relocating fuel and battery to the front of the hull... _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Thu Oct 13, 2011 11:36 pm

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? roger that...gas tank is already up there...only thing left to try is the battery. Trying to avoid buying a new boat. _________________ 27 gdsd pushing a 16X48 gd boat
Thu Oct 13, 2011 11:38 pm

gariverrat New Member Joined: Sun Jun 05, 2011 8:18 pm Posts: 2 Location: Valdosta, Ga	Re: 27hp gdsd too slow? Also need to make sure that you have the correct mud motor on the boat relative to transom height. Transom height effects your trim/speed. My Express 15x48 has a ribbed bottom and 23 vanguard. WOT with one person, fuel full and some gear is 26 mph. Good luck. _________________ 1548 Express, 23 Gd Surface drive
Mon Oct 24, 2011 8:13 pm

jthib24 MMT Pro Member Joined: Sat Aug 20, 2011 1:28 pm Posts: 93 Location: Orange, TX	Re: 27hp gdsd too slow? Just got the motor back from the shop. Had new belt put on and a tune up done. Took it out today...with me (210), my buddy (180), and my lab (90), ran 23-24 and hit 26 in the shallows! Not bad I'd say. _________________ 27 gdsd pushing a 16X48 gd boat
Wed Nov 02, 2011 12:25 am

Gigafowl MMT Elite Member Joined: Tue Jan 13, 2009 7:19 pm Posts: 6441 Location: Trinity Bay - Texas	Re: 27hp gdsd too slow? All right - thats about as good as you could ask for speed wise with that load You ought to be ready to go for opener now Good Luck _________________ Eat - Sleep - Hunt ! ! ! "It is good to have an end to journey toward; but it is the journey that matters, in the end."
Wed Nov 02, 2011 6:57 am

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27hp gdsd too slow?

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