Hydromotive P5X results are in
 

25 daytona single step. 7lbs procharged 502 mag

30 lab bravo =plained out good . Hit rev limiter 5400rpm 85 mph on gps
34 natural bravo= prop wanted blow out while planing. 5000rpm 91mph on gps
31 hydrmotive p5x = prop never blew out,plained out at 2100 rpms,boat turns better and seems like it runs smoother.5200 rpms 92mph on gps. I dont think the 34 bravo would plain out with full fuel and 5 people, it was on the verge of blowing out until about 45 mph. The p5x ran a little faster and it never wanted to blow out ever. Made the boat feel totally different. Seems like a great prop, thanks Julie at throttle up. I told her my numbers and she got me the right prop the first try!

Re: Hydromotive P5X results are in
 

We also tested another 25 daytona with a double step and a really high x dimension. He could not plain out with the 34. He was using a 32 lab bravo and clicked 112 on the gps. It also wanted to blow out a little. With the p5x he plained out easily and he went 115 mph on gps and he never blew the prop out.

Re: Hydromotive P5X results are in
 

What were your rpm's with the P5x? What were the rpms with your friends rpms

Re: Hydromotive P5X results are in
 

My rpms were 5200. His were 6300 on his recall tach. He thinks he could have went maybe a little faster but the rear of his boat was getting a little squirelly he said. I am not running a nose cone and he is. I wonder what that would do for my numbers. He of course is running a much bigger motor.

Re: Hydromotive P5X results are in
 

How did they carry the nose? I thought the P5X is a bow lifting prop. I run the regular P5s and the Spectre runs flat, but when I run the Bravo 4 blades, the nose is about a foot higher than when the Hydromotives are on the boat. I like the Hydromotives much better.

Re: Hydromotive P5X results are in
 

That is the problem, I was told, with trying to run a 5 blade on an eliminator tunnel. It picks up the transom too much and makes the boat feel loose.

Re: Hydromotive P5X results are in
 

good info on setups...
i have a 25 single step and have monkeyed around with many props...according to eliminator (jerry may), the single step should be setup to run "flat" and the two-step with 5 degrees of bow lift...

i tried a 5 blade 30p hering....blew out trying to plane..had major issues trying to get hering to "fix" it....it looks real nice hanging in the garage...

various 4 blade b1....and settled on a 32p non-labbed...right at 112 at 5600

my setup issue was to get rid of the 60-80 mph "hop"...i was told to have the "rake" taken out of the 4 blade to give a little more transom lift to make the boat run flat...

very interested in the details on the setup with the 5 blade hydro...where is the "x", how much trim, any mid range "hop"....

thanks
gm

Re: Hydromotive P5X results are in
 

How did you get your slip so low to get those speed numbers? As for the prop it is a bow lifting and my boat (single step) runs flat. Seans(double step) runs with the nose up. You can see light through the tunnel when he is coming towards you. I think maybe his x is too high,he said it is squirrely with any prop but it felt a little better with the 5 blade. We will measure the x's and post soon. Both boats at 90 mph the single step feels more stable.

Re: Hydromotive P5X results are in
 

10% slip is about right for a cat....
on the calculator...
5600 (hit limiters) @ 10% with 1.36 gears and a 32 pitch prop gets you at 115mph....so 112 was right in there...

i have found a big difference in props at "cruising" speeds.. i use 3000 rpm as my reference....i see 60mph with the 32p 4 blade...with the 5 blade hering it was slower (55 mph)...that did not make much sense to me...

are either of the 25's discussed above using a standoff box???

gm

Re: Hydromotive P5X results are in
 

No,I figured you must be runnin 1.36 gears. Did you notice a big diff with a nose cone?

Re: Hydromotive P5X results are in
 

So far the best speed I have had is with a Houston Prop labed bravo1 30 with a top speed of 105.8 @ 5800 12% slip. The same weekend I ran the 29 P5x & best speed was 101.3. My computer did not log the run so I did not know what the RPM was. I like the P5X for the way it carries the bow but I just did not see the speed. Hopefully I will get another chance to go out & compare my 29 P5x, 30 labed bravo & stock 32.

I also have a stock 34 & takes me half a day to get planed out since it blows out so bad.

Re: Hydromotive P5X results are in
 

BLOWNBOAT,

I was a rider in a 28 Daytona that had a nose cone on side and no cone on the other. The drive without the cone started picking up a lot more rpms above 85mph compared to the side with the nose cone. We stopped at 105 because there was a several hundred rpm different at that point.

We either had 32 Bravo 1s or 31 Quad IVs, I don't remember what was on at that time. The drive had a leading edge cone on it and his other drive was getting fixed so we threw this one on.

Re: Hydromotive P5X results are in
 

blownboat...
i can't really comment on the nosecone deal.. it has always had a nose cone...
i can tell you that i tried a 2" shorty and the boat did not like that at all...could not roll it over..
i have a standard length lower and the top of my drive is about two inches below the rubrail

i have learned that estimating x dimensions on daytonas by looking at the drive relative to the rubrail is only meaningful when comparing apples to apples...the two step daytona has a completly different center pod and therefore the rubrail comparison to a single step is not valid ..

gm

Re: Hydromotive P5X results are in
 

Well we will see soon, I am going to try the same length lower but it has a nose cone on it. It is amazing that it would make that much difference. Jspeeddemon,Was that a p5x or just a regular p5 hydromotive. Hydromotive sais the x is a bow lifting prop and the p5 is a stern lifting prop. Throttle up sais you may get a little more stern lift with the x just because it is a 5 blade, but not much. Maybe that is why seans red daytona is loose in the back,or will to high of an x do that. Humm...

Re: Hydromotive P5X results are in
 

I have learned the easiest way to compare is to go from prop center line & compare to the lowest part of the sponsons. This way works good for single engines but when twins are compared it getts a little more tricky. Different hulls will still make a difference but at least there are 2 common points this way.

By the way, My 26 is 1/2" above,

Re: Hydromotive P5X results are in
 

Yes you are correct, according to the prop info I received the P5X is a bow lifter but the fifth blade gives the extra lift which Daytonas don't care for, for the most part. I was told definitely the P5 will not work at all. My info came from the Max Machine Worx folks who have been involved in testing the five blades with several of their customers.

Re: Hydromotive P5X results are in
 

The P5-X gives some stern lift but not like the P5. The semi-cleaver blades like Hydromotives or herrings give a greater amount of stern lift than the P5-X prop.

Julie

Re: Hydromotive P5X results are in
 

It worked great on mine,but then again I am only running in the low 90s and I have a low x dimension!

Re: Hydromotive P5X results are in
 

I put P5X's on my 42 Fountain, and ran 94 at 5250 still hitting the rev limiter. Great Prop, handled well, has a slight cavitation at startup but digs right in right before leveling out. Cruising is the best, I cut 40 Gallons of fuel out of a typical weekend.

Thanks to Julie at Throttle-Up she was a great help.

Re: Hydromotive P5X results are in
 

Blownboat, Where do you boat?? Havasu?? I'll be in Phoenix over thanksgiving and was wondering what there is to do around that town, Havasu looks to be about 3 hours away??? What else is there?? I'll have the prego wife and 2 year old, and they mentioned the ZOO, I;m not really into it but I guess I'll take them!!
Any info. would be great!!
Thanks!!

Re: Hydromotive P5X results are in
 

what do you mean by the prop blowing out?

Re: Hydromotive P5X results are in
 

When your prop looses bite in the water, slipping in the water. On many boats just as the bow drops down when taking off the motor winds up and with some props if you dont let off the throttle the boat won't move and your rpms will continue to climb. Some boats with a high x dimension blow out easier and can not even get up on plane. Some may have a better definition than me. Larger pitch props blow out easier .

Re: Hydromotive P5X results are in
 

Blownboat - I have a 26' Eliminator Daytona with an HP500 that is Whipple Charged at 6psi of Boost. On a 32p Bravo 4 blade prop with 1.36 gears in an imco 4*4 drive I am only getting 95mph on GPS at 5K rpm. With a decent amount of gas and a few people it runs 91-93 at 4800. I ran a 30P Labbed 4blade prop and hit 104 at 5650rpm.

Do you think this is a prop I should consider??

Re: Hydromotive P5X results are in
 

BgBoost1, what is your X. Are you having any problems with the 30? With my X 1/2 above the bottom sponsons I can not stay on plane below 2800 rpm (30 mph). Any less then that & the boat starts falling off plane. With the 29 P5x I can stay on plane as low as 2000 rpm. Still playing with it but my top end is off with P5x by about 5 mph

Re: Hydromotive P5X results are in
 

blownboat. so what solves blow out? larger prop with less pitch? whats my x dimension? i have a 79 35ft cig mistress w/ ssm#3a's b/w 10 plate trans and am building 850hp blower motors. boat had 555n/a with 3 blade cleavers of unknown make. anyone from the old school remeber what prop characteristics a 35 mistress likes? thaks folks for any help or advice you can lend. ratman

Re: Hydromotive P5X results are in
 

Bgboost1,
The only way to know if a P5X will work on your boat is to try one. If you want to try one out we have P5X test props available, let us know.

One reason you saw the difference is speed with the lab prop was the increase in rpm. Without comparing a stock prop and a lab prop running at the same rpm it's hard to tell if the lab finishing attributed to the speed increase or of it was the increase in rpm which resulted in more HP.

Matt

Re: Hydromotive P5X results are in
 

Hey Throttleup,

What about us guys who have the earlier bravo ones? I have a 1997 Bravo One drive that was beefed up by Teague Custom Marine. It still has the smaller prop shaft. Will the 5 bladed props work in a single engine 29 footer, or will the torque break the prop shaft?

Re: Hydromotive P5X results are in
 

When the 5 blade props came out everyone was reluctant to put them on standard prop shafts.

We started selling them to some customers with standard props shafts and so far there have been no problems.

If you generally boat in smooth water or don't fly the boat I don't think you will have a problem with a 5 blade and the standard prop shaft.

Needless to say we have had customers with HP 500's break XR prop shafts and other customers with 800hp and have no problems with the standard prop shaft. If really depends on how you drive the boat more than it has to do with the prop.

We have had some customers have fewer drive problems with 5 and 6 blade propellers than with 4. I imagine the reason for this is reduced vibration and prop shaft stress, especially in high drive height applications.

Matt

Re: Hydromotive P5X results are in
 

Sweet, thats what I like to hear!!!!!!!!!!!!!!!!!!!!!!!! :D :D :D :D :D :D :D :D :D :

Re: Hydromotive P5X results are in
 

TurboJack,Thanks for the Business,glad to hear the positive results,I am sure the P5X is a good prop but just not for every boat out there.Thanks again Darin

Re: Hydromotive P5X results are in
 

Keep in mind that these props are stock not lab finished. We have typically seen 2-4 MPH increases with labbing.

Julie

Re: Hydromotive P5X results are in
 

If on my last run with the P5x I would have gotten a computer log of the run I would then know at least what RPM I was running & call throttle up as to where to go from there. Since I thought I was running a log I did not pay any attention to the RPM. I have now pulled the motor to freshen it up since it has been 3 years since I have been thru it. Once I get motor back together I will go back out & see what the P5x will do on top end. I know I can not run around with the 30 bravo since my min. planing speed is 30mph when I am running the high x

Re: Hydromotive P5X results are in
 

This question is to Julie at Throttle-Up: What is the correct way to measure the X dimension. The one method that your company will recognize as good information on choosing the right prop (or at least a good starting point baseline).

Information that may be helpful on the above question? Awesome 31' Thundercat w/twin 525HP 600 Lb.torque motors with standard 1998 Bravo 1 drives. No cones. Since the motors are new and not in the boat till spring, the only reference I can give you is on the previous set-up. Twin 7.4L mags with 330hp, bravo 1 four blade 28P props. 70mph on GPS @4600rpm. Would not plane under 30mph. The ONLY time the props would blow out was under a very very tight turn under heavy throttle.

Getting to the point-------looking for the correct prop for a good starting point.

Re: Hydromotive P5X results are in
 

Rotax454,
Since there are so many 1", 2" and even 3" shorty lowers out there and many are running with spacers the best way is to measure from the center of the prop shaft to the bottm running surface of the hull.

Where the props you an before lab finished? What will be the WOT rpm of your new motors? Do you have dyno runs on the new motors?

There are many considerations when chosing a prop, it's best if we have the opportunity to talk to you and we can get all the information we need to make a recomendation. We also have test props that may be a good starting place.

Re: Hydromotive P5X results are in
 

What should the trim be set at when measuring this way? On my 25' Carrera cat, I measure the centerline of the prop shaft dead even with the outside sponsons (lowest part of the hull) when the trim is out where I run it at top speed (about +7 degrees from the sponson angle). If I lower the trim all the way down, the prop shaft centerline will be something like 2" below the outside sponsons.

Re: Hydromotive P5X results are in
 

For reference purpose we need to know where the prop shaft is when the drive is positioned so the prop shaft is parallel with the running surface of the bottom.

Re: Hydromotive P5X results are in
 

ROTAX 454 I will bet you could use the set of P5-32s I have for sale. They ran 5100 RPM on my HP500s. Let me know.

Shawn

Re: Hydromotive P5X results are in
 

Thanks Julie for the quick response. Do I measure from the "lowest" point of the hull (sponson) running surface? Of course to the centerline of the prop shaft. The props were NOT lab finished. The new motors will have a 5200 rpm WOT criteria. The heads/cams are being built for that specific 5200 usage. I am not planning on dyno testing the motors. Although I would certainly like to, just don't have a good source. I will try to Tyler Cocket and see if he (providing he has a dyno) willing to dyno my motors.

I am considering installing the 2" IMCO shorty lowers. Looking for your professional opinion on whether to stick with the stock bravo lowers (98 & up model) or going to the IMCO lower, and if so what height? Let me know on the X dimension question, then I will measure it correctly and get you the dimension. May help in answering so of my latter questions. Thanks again. Richard

Re: Hydromotive P5X results are in
 

Shawn, I will keep those in mind. The motors will be producing approx 550 HP and 600+ Lbs of torque. Don't know (only testing will show) if your props will hold the motors to the desired 5200 rpm level at WOT. What size cat do you have? How did the boat react to these props? Richard

Re: Hydromotive P5X results are in
 

Richard, I have a 36 Spectre with HP500s. I moved to a smaller prop because the boat was right around 65-70 MPH at 3200 - 3400 RPM and I was right where the boat porpoises. By going to a P5 31" I was out of the porpoise range during cruise speed where I spend most of my time and they would still run the same speed at a higher RPM. As far as your lower, I would go with a short one and use spacers as needed to get where you want. This will give you the most amount of adjustment. There are a lot of guys on this board that will let you test used parts and either return if they don't work, or you buy them if they do work, or you scratched them.

Good Luck

Shawn