Today, I ran my new to me 26p hydromotive Q4 OT. First off, I was very happy with the way it handled, it drove best at 1/4 above, where as the trophy drove best 1/4 below. Made two passes in the opposite direction, gps @ 87 one way and 92 the other with one passenger.
Hydromotive first run
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whipper
Well-Known Member
What gears 1.62 Sporty? Thats awesome!!
Right in the magic 7% slippage number very efficient!! 1.87,s you would be below 3% not unheard of just more rare. Todds props have been known to be that low though. Sweet props!!
If that 225 promax has 1.87 gears or 1.75 gears, I would think it is more than a 26 pitch. With NO slip at all with 1.87 gears and 6750 rpms it comes out to 88.86mph. Even with 1.75 gears it would still be in the negative for slip, to 0% slip.
Todd's props may be good (and they are!), but they are not running that well.
I have a "27" pitch ot that I run, and based on the slip numbers it runs, it has to be more than a 27. I have no problem believing 4-5% but not 1-3%.
Todd's props may be good (and they are!), but they are not running that well.
I have a "27" pitch ot that I run, and based on the slip numbers it runs, it has to be more than a 27. I have no problem believing 4-5% but not 1-3%.
Its a stock 225pm with an Allison worked 1.87 sportmaster, the prop is suppose to be out of the box stock ran 3 times. The 92 was with current and the 87 was against current, and we had 15mph wind, but dont remember which way it was blowing. I had one passenger, 2 batteries, and all my fishing gear, but no troller. My 26p trophy best solo is 88.4 gps.
Allyfishing
Well-Known Member
That's smokn. :big grin
you have to add 1" for cupping and I think the OT props are a hair stiff where as the X-0t seem to run more normal slip numbers. The pitch is really just a reference number in my opinion as most props are progressive now days and the stamped number is just the average as leading edge pictch may be less than what is stamped and trailing pitch may be more than what is stamped, plue the trailing edge cup and tip cup also add to the efficincy....So slip number in my opinion are just to see if you are in the ballpark and the number on the gps and rpm guage are what really matter.
I have run Hoss's breify and they seemed to have much higher slip numbers but still accelerated and topended really well, the calculator just said not as efficient...I just like the way 4 blades turn and handle which is the only reason I sold them
I have run Hoss's breify and they seemed to have much higher slip numbers but still accelerated and topended really well, the calculator just said not as efficient...I just like the way 4 blades turn and handle which is the only reason I sold them
I have a 225X so my limiter is 6850 and the 27 ot I have is 91.x whether it is myself or another person. It hits the limiter easily.
So, I have the same gear ratio, 1 more pitch, and 100 rpms more, and can't get the speed you are running.
Every single boat is different, and I am not trying to argue. After many years even at my young age being around this I have found one thing that does not lie... numbers. My setup comes in at 93.64 with no slip. So the numbers say I am coming back at 2% or so slip... which is not possible. The prop is more like a 27 1/2 to a 28.
You must have one heck of a current there!
So, I have the same gear ratio, 1 more pitch, and 100 rpms more, and can't get the speed you are running.
Every single boat is different, and I am not trying to argue. After many years even at my young age being around this I have found one thing that does not lie... numbers. My setup comes in at 93.64 with no slip. So the numbers say I am coming back at 2% or so slip... which is not possible. The prop is more like a 27 1/2 to a 28.
You must have one heck of a current there!
current definatly could be a factor. Also engine height and gearcase work can effect things as well as lip.
Have you tried more engine height every 1/8" to a point seems to be about 1 to 1.5 mph on my slower 200 EFI setup, I kept going up to get my best speeds until the boat no longer reponded to trim in the mid range 55 to 65
Have you tried more engine height every 1/8" to a point seems to be about 1 to 1.5 mph on my slower 200 EFI setup, I kept going up to get my best speeds until the boat no longer reponded to trim in the mid range 55 to 65
I didn't go any higher than 1/4 above that day. I didn't have alot of time to test it because I had to go to work. This was also the same day I "solo" bat turned a worked 27p srx @ 1/4 above and to much trim. The boat did warn me @ 90 when the stern started to walk sideways and I thought to myself " I read about this and this is not good" so slowing down and trying to control the boat, I'm guessing that I was able to slow to 80 mph before it happened.
catfish123
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If I had a 26 pitch OT that would run 92 mph on an XB2003 with a 225 Promax with 1.87 ratio, at 6750 rpm's, I wouldn't try to get anyone, including Todd to work "magic" on it because it's already there. Great running!!!
GotMyAlly
Well-Known Member
Did you ever get that prop worked or is it still stock? That one had some thick blades when I had it. Might have a little more in it with a little work.
catfish123
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Matt's prop is still stock........He has run my 27 OT that is much thinner and tweaked for the combo he is running. It runs exactly the same mph and is into the limiter just like his. We were both surprised by this because his prop is much thicker than mine.
whipper
Well-Known Member
X1!! Dont ever work that prop or sell it unless its to ME!!
Once and a while a prop comes along like yours thats for sure. Those prop slip calculators as mentioned are only for referance for sure. Ive used them lots with new props to test out as a base line. But ive had a few that dont make sence according to running the numbers with the standaerd 7% slip factor with allisons. Ive ran a few according to my gps are running 0 slip. The one thing those calculators dont factor in is our hulls. If there was such a feature it would say {pluss 5mph if your an Allison owner}:beer: Because are Boats rock!! In more ways than one.
