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#11850099 - 09/26/16 12:12 PM ranger z21 porposing at low speedat
rwb9043 Offline
Outdoorsman

Registered: 06/19/14
Posts: 73
Loc: burleson tx
my 2005 ranger z21with a yamaha hpdi 250 with a 10in plate and a 25t1 prop the boat will porpoising at low speed up until about 38 to 42mph the problem started after i added the to 10 ft power poles, i have tried alternating fuel tanks and moving everything possible to the front i know this is somewhat the nature of these boats but never did before adding the poles, would a hydraulic plate have any advantages? i seen where someone bbc had added trim tabs i have some 5deg motor wedges that i have orderd but not yet installed they look a little extreme maybe should have gotten the 2 deg insted any one ever ran into this problem any help would be greatly appreciated.

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#11850487 - 09/26/16 04:14 PM Re: ranger z21 porposing at low speedat [Re: rwb9043]
ssmith Online   content
Extreme Angler

Registered: 11/22/07
Posts: 2594
Loc: scotland tx
you can take a boat that preforms well an hang 75 lbs a foot off the back of the boat an it will preform differently.

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#11850863 - 09/26/16 07:26 PM Re: ranger z21 porposing at low speedat [Re: rwb9043]
rwb9043 Offline
Outdoorsman

Registered: 06/19/14
Posts: 73
Loc: burleson tx
yep im sure the poles are whats causing it im looking for a way correct it if possible


Edited by rwb9043 (09/26/16 07:27 PM)

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#11851462 - 09/27/16 07:11 AM Re: ranger z21 porposing at low speedat [Re: rwb9043]
Josh@SCP Offline
Angler

Registered: 04/27/07
Posts: 397
Loc: Winnsboro TX
Does the boat have a jackplate on it now or did they mount the poles with a sandwich bracket? If it does then you might need a little more bight added to the prop.
_________________________

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#11852864 - 09/27/16 08:46 PM Re: ranger z21 porposing at low speedat [Re: Josh@SCP]
rwb9043 Offline
Outdoorsman

Registered: 06/19/14
Posts: 73
Loc: burleson tx
it has a 10in slidemaster jackplate with a 25t1 prop i dont recall what it is set at but i have checked the motor height before think it was in range that was correct

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#11853321 - 09/28/16 07:20 AM Re: ranger z21 porposing at low speedat [Re: rwb9043]
steve@hydrodynamics Offline
TFF Celebrity

Registered: 08/25/06
Posts: 6668
Loc: Quitman,Tx
a hydraulic plate will get rid of that mid range porpoise by lowering it down.
i would not install those wedges, as it will take away max available trim.

do like josh says.. get the prop looked at first, then add a hydraulic plate later
if you want. (btw, i have them on sale)

also take a good look at the mounts on the power poles.. you want them high enough
so they don't drag. you can loosen the side bolts on the slide master and raise the poles
as high as they will go. that might help some too.
_________________________
www.hydrodynamics-usa.com
903-763-5225





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#11854529 - 09/28/16 06:21 PM Re: ranger z21 porposing at low speedat [Re: steve@hydrodynamics]
rwb9043 Offline
Outdoorsman

Registered: 06/19/14
Posts: 73
Loc: burleson tx
i would love to send you the prop just need to find an extra to get me by so i can send you mine been useing the boat about every weekend

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