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vertical_edge_800
MMT Pro Member
Joined: Thu Dec 30, 2010 5:48 am Posts: 274 Location: Palmer, Alaska
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 GDSD 32+ mph cavitation issues
I strapped my GDSD on a lowe 1652 today and gave her a whirl... The prop keeps coming out of the water no matter what I do to the trim when I start going past 30mph. It spanks the rev limiter (4350 RPM). Has anyone ever tried bending the trim tabs on the skeg to try and hold the motor into the water better at high speed? I think once I'm done with my cam/piston/rockers and a higher pitched prop I could see 35mph but not if I cant even hold the prop in the water!
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Sat Jun 30, 2012 1:19 am |
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55@28
MMT Pro Member
Joined: Fri Apr 13, 2012 3:01 pm Posts: 238 Location: Eagle River, Alaska
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 Re: GDSD 32+ mph cavitation issues
Bend the two tabs on the sides up to help hold the prop down in the water at speed. Was having the same issue till i did it to mine. That is what they are for, bendingnthe main skeg for right/left is recommended if you have the 3 blade, but not a huge issue for me with weight distributed correctly.
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Sat Jun 30, 2012 2:07 am |
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Robn1020
MMT 1000 Club
Joined: Mon Feb 16, 2009 6:09 pm Posts: 4232 Location: Cypress, TX
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 Re: GDSD 32+ mph cavitation issues
X2 the tabs on the back. Mine did it too once I could get my boat over 33. Just a small bend up and problem was solved.
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Sat Jun 30, 2012 8:14 am |
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CootSlayerRMFT
MMT Elite Member
Joined: Thu Feb 02, 2012 12:53 am Posts: 7565 Location: Prairieville, LA
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 GDSD 32+ mph cavitation issues
I just did it to mine this week and it was immediately a lot better. I've still got a little fine tuning to do, but it's a clear difference.
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Sat Jun 30, 2012 8:52 am |
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vertical_edge_800
MMT Pro Member
Joined: Thu Dec 30, 2010 5:48 am Posts: 274 Location: Palmer, Alaska
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 Re: GDSD 32+ mph cavitation issues
I wasn't able to keep the prop from coming out of the water still. I'm going to cut the tabs off and weld some new ones on at a little more aggressive angle with a wider tab... maybe a little lower on the skeg. I tried bending them a little at a time until they were bent pretty far up, it helped a little but I still have to hold the motor down in the water. Total pain in the butt.
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Sat Jun 30, 2012 11:07 pm |
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brasso
MMT Elite Member
Joined: Fri Oct 07, 2011 12:58 am Posts: 5557
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 Re: GDSD 32+ mph cavitation issues
Get a motor with trim and be done with it
_________________ 1850 Uncle J Delta Performance level 4 GTR
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Sat Jun 30, 2012 11:12 pm |
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vertical_edge_800
MMT Pro Member
Joined: Thu Dec 30, 2010 5:48 am Posts: 274 Location: Palmer, Alaska
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 Re: GDSD 32+ mph cavitation issues
See my post in the classifieds for a GDSD frame 
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Sun Jul 01, 2012 12:34 am |
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brasso
MMT Elite Member
Joined: Fri Oct 07, 2011 12:58 am Posts: 5557
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 Re: GDSD 32+ mph cavitation issues
Lol I saw that and almost posted on it but held off. Seeing that the motor is already modded that's an excellent choice. Find yourself a gt frame 
_________________ 1850 Uncle J Delta Performance level 4 GTR
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Sun Jul 01, 2012 1:03 am |
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dog walker
MMT Elite Member
Joined: Tue Jan 13, 2009 6:08 pm Posts: 5282 Location: Meraux,La.
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 Re: GDSD 32+ mph cavitation issues
Hmmm I know a boy with a modded gdsd and has no issues keeping his down. It did take some bending to find the sweet spot though. Once it's up and running the motor will run fine,it just pops out every so often. Not enough to worry about.
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Sun Jul 01, 2012 7:59 am |
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vertical_edge_800
MMT Pro Member
Joined: Thu Dec 30, 2010 5:48 am Posts: 274 Location: Palmer, Alaska
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 Re: GDSD 32+ mph cavitation issues
All the bending in the world wasn't going to fix this... I cut the trim tabs off, made some new ones about 2x the size of the originals, then welded them on at a steeper angle. When I took it out for a test run it was still popping out a little, I bent them slightly more, and no more popping out of the water! I lost 1 mph, but that's worth it for not coming out of the water. Holds 30mph with 2x 200lb guys in deep water with some light waves, 31 by myself.
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Thu Jul 05, 2012 7:42 pm |
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vertical_edge_800
MMT Pro Member
Joined: Thu Dec 30, 2010 5:48 am Posts: 274 Location: Palmer, Alaska
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 Re: GDSD 32+ mph cavitation issues
*update... The big trim tab works great... in deep water... I took it through some slop yesterday and there was tons of salad hanging on it. I need to dress it up a little better... R&D project I guess.
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Sun Jul 08, 2012 12:42 am |
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take'emgator
MMT Super Elite Member
Joined: Mon Oct 19, 2009 6:38 pm Posts: 10201 Location: SETX
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 Re: GDSD 32+ mph cavitation issues
I was gonna say quit leaning/pushing down on the handle.....lol
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Sun Jul 08, 2012 1:50 am |
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