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| prop depth question https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=6&t=62885 |
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| Author: | Westalwaterfowl [ Sun Jul 26, 2015 8:42 pm ] |
| Post subject: | prop depth question |
Hi folks, I've been searching a while with no direct conclusion to my problem. I'm running a 1436 boat with 1' full width pod, 8hp go devil longtail. My adjustment nut has my longtail just in the water deep enough to push at idle, in fact I have to pull up on the handle to make the prop grab, however at wot my cav plate seems to be to deep making my engine work really hard, I'm guessing 6-8 inches bellow surface as I can't see the plate at wot. My godevil is an older model and I only have 1/8 to 1/4" of plate past the spine that runs down the center on the top of my cav plate. Question is. Is that really enough to bend down and bring my prop up at wot, and since I really need to drop the adjustment bolt 1/4 turn or so I'm afraid it will only get worse? I'm planning on either a 13 or 22 hp predator upgrade but would really prefer to figure this out first. Thanks! |
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| Author: | BlueShamu [ Sun Jul 26, 2015 9:49 pm ] |
| Post subject: | Re: prop depth question |
Are you adjusting the trim tab on the cav plate? Most liberals seem to suffer from the same mental condition....it's called stupidity! |
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| Author: | Westalwaterfowl [ Mon Jul 27, 2015 7:25 am ] |
| Post subject: | Re: prop depth question |
| Author: | BlueShamu [ Mon Jul 27, 2015 10:20 am ] |
| Post subject: | Re: prop depth question |
Yes...a little goes a long way. Got a pic? Sent from my iPhone using Tapatalk |
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| Author: | kibb [ Mon Jul 27, 2015 4:54 pm ] |
| Post subject: | Re: prop depth question |
^x2 |
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| Author: | SwampDonkey1 [ Wed Jul 29, 2015 6:58 am ] |
| Post subject: | Re: prop depth question |
| Author: | Glades Ranger [ Wed Jul 29, 2015 8:36 am ] |
| Post subject: | Re: prop depth question |
Good idea, SwampDonkey1! Much easier to bend the "trim tab" than the plate...have one on my 2004 MB LT and it was easy to fine tune the planing depth. A friend has a 20 year old GD 25 LT and never had to mess with the cavitation plate, he was lucky, each hull/load is different necessitating this tinkering. |
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| Author: | BlueShamu [ Wed Jul 29, 2015 9:36 am ] |
| Post subject: | prop depth question |
This is all you need to do with a Go-Devil: Again, a little goes a long way. Sent from my iPhone using Tapatalk |
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| Author: | Westalwaterfowl [ Wed Jul 29, 2015 11:33 am ] |
| Post subject: | Re: prop depth question |
Thanks guys! Yea I'm gonna have to take a Metabo to mine, it's not made like that. I'll upoad a pic this eve when I get home. |
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| Author: | Westalwaterfowl [ Wed Jul 29, 2015 3:04 pm ] |
| Post subject: | Re: prop depth question |
Here's how my plate is made, I wasn't sure if that small bit of plate past the spin would be enough adjustment to give me the lift I need, I highlighted where I'm thinking of making cuts to actually give me a trim tab. |
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| Author: | BlueShamu [ Wed Jul 29, 2015 3:12 pm ] |
| Post subject: | Re: prop depth question |
Looks like somebody cut your trim tab off! LOL...at least compared to what's on GD's literature. I'd take a pic of mine...but, it's 3 hours away. Sent from my iPhone using Tapatalk |
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| Author: | Russ [ Wed Jul 29, 2015 3:18 pm ] |
| Post subject: | Re: prop depth question |
That should be fine. You probably only need a half inch off at most. It doesn't take a whole lot to affect change on it. |
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| Author: | Westalwaterfowl [ Wed Jul 29, 2015 3:22 pm ] |
| Post subject: | Re: prop depth question |
That's what I was thinking 1/2-3/4" I think it came from the factory like that. It's an old motor, serial # 1300 lol. |
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| Author: | BlueShamu [ Wed Jul 29, 2015 4:28 pm ] |
| Post subject: | prop depth question |
My 16 hp is an early '90's vintage and I know it has the trim tab. We were using 5. & 8 hp's back in the 80's on fiberglass pirogues....can't really recall if they had them or not. Most liberals seem to suffer from the same mental condition....it's called stupidity! |
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| Author: | Westalwaterfowl [ Wed Jul 29, 2015 5:52 pm ] |
| Post subject: | Re: prop depth question |
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