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| 27hp gdsd too slow? http://mudmotortalk.com/mmt_v2/viewtopic.php?f=2&t=22947 |
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| Author: | jthib24 [ Sun Oct 09, 2011 10:44 pm ] |
| Post subject: | 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? |
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| Author: | Gigafowl [ Sun Oct 09, 2011 10:53 pm ] |
| Post subject: | 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) |
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| Author: | jthib24 [ Sun Oct 09, 2011 11:16 pm ] |
| Post subject: | Re: 27hp gdsd too slow? |
3 blade...and it looks like the widest part on one of the blades is 3.5" |
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| Author: | Gigafowl [ Sun Oct 09, 2011 11:30 pm ] |
| Post subject: | 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 ??? |
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| Author: | jthib24 [ Sun Oct 09, 2011 11:46 pm ] |
| Post subject: | 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. |
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| Author: | Gigafowl [ Mon Oct 10, 2011 6:34 am ] |
| Post subject: | 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.... |
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| Author: | jthib24 [ Mon Oct 10, 2011 10:15 am ] |
| Post subject: | 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. |
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| Author: | Woodiebuster [ Tue Oct 11, 2011 4:45 pm ] |
| Post subject: | Re: 27hp gdsd too slow? |
| Author: | Gigafowl [ Tue Oct 11, 2011 6:31 pm ] |
| Post subject: | Re: 27hp gdsd too slow? |
The gear ratios are different - but only slightly - no more than 1 to 2mph difference at similar rpms... |
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| Author: | jthib24 [ Thu Oct 13, 2011 11:26 pm ] |
| Post subject: | 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? |
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| Author: | Gigafowl [ Thu Oct 13, 2011 11:36 pm ] |
| Post subject: | 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... |
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| Author: | jthib24 [ Thu Oct 13, 2011 11:38 pm ] |
| Post subject: | 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. |
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| Author: | gariverrat [ Mon Oct 24, 2011 8:13 pm ] |
| Post subject: | 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. |
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| Author: | jthib24 [ Wed Nov 02, 2011 12:25 am ] |
| Post subject: | 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. |
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| Author: | Gigafowl [ Wed Nov 02, 2011 6:57 am ] |
| Post subject: | 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 |
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