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Discussion Starter · #1 ·
I need some help with getting the right prop. I recently got a 24'8" Transport XLR8 and powered it with a Yamaha 300 HPDI. I placed a 23 degree pitch non-ported power tech OFX on it, as suggested. My problem is that I can not get my RPM over 4700 and my MPH over 52. When I trim up the motor the boat starts porpoising badly. The prop gives me good hole shot, but the end out performance is not what I expect (ie 5500 RPM and about 60mph). Does anybody have any suggestions....Thanks
 

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yeah, Chris can get you close after 4 tries. Try that if you got all day or just want to waste a day on the water. I've heard he guesses on all his applications and gets his info from the powertech website. The same one that has no clue about shallowwater boats.

But he is close to the water and will work with you all day if necessary. That is better that anyone in Texas.
 

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GolfDude said:
yeah, Chris can get you close after 4 tries. Try that if you got all day or just want to waste a day on the water. I've heard he guesses on all his applications and gets his info from the powertech website. The same one that has no clue about shallowwater boats.

But he is close to the water and will work with you all day if necessary. That is better that anyone in Texas.
I got my prop info from the power tech website two yrs ago when I bought my Transport and they were IMO right on.
13 inch 15 pitch. on a yamaha 150 vmax..........33 mph at 5300rpm wot.
That hull is not made for speed and the rpm could be another 200 higher, but I'm not changing it.
 

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Why not get with Power Tech. They should be able to take care of your problems!!! Especially if it's a new prop. They usually let you return it and send you a different prop.
 

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Don't going throwing money at someone else to fix your problem. That hull and motor combo has been tested and played with a bunch. I've driven three different XLR8's, two with 300hpdi's. One is TV's demo boat with the 160 gallon fuel capacity. Both of those had PowerTech four blade props. I can't remember model discreption, but they are the one with more radical design than the traditional round eared four blade. Sweeped tips with alot of cup. Strange looking at first but they work. Both those boats got the performance that your looking for. I'm thinking that something might not be right with the prop you have or another issue that isn't allowing the motor to spool up.
Not to spoil your day, but keep a close eye on the bottom of your boat. Particularly down the sides of the running pad.
 

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Porpoising or Bottle Nose Dolphining?

Have you tried calling Tran and seeing what he thinks? I suggest getting him to get a handful of props and meeting you at the water. The OFX is a great prop and may work well on other boats, but every boat (even of the same make) and prop (even of the same make) are different.

If you do this make sure he brings a prop that does not have as much rake. The OFX is high rake and lifts the bow.

Once you get the top end where it needs to be you can port (AKA - ventilate) a prop to get you better hole shot if it's lacking.
 

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Discussion Starter · #16 ·
Thanks for all of the advice, guys. Talked to Louie Bauman, Chris at Cosatal props and a guide down at Baffin that runs the exact same set up. I will probabely spend the morning on the water with Chris to try to get the right prop. I am going to get the throttle linkage checked out and the tach to make everything is ok.
They all think I should be running a 3 blade Yamaha VMax 25 pitch. I think it will run fast but I am concerned about the hole shot. We will see....
 
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