Bravo 1 vs Hydromotive
 

I know the differences between both props are the Bravo 1 gives more bow lift and the Hydromotive gives more stern lift. Now lets say you have a Bravo and raise up the engines shouldn't that be the same as putting on Hydro's. I dont think you can raise the engines as much with the Hydros as you can with the Bravos?

Re: Bravo 1 vs Hydromotive
 

The blade design and geometry are different.

You can change the performance of the boat and motor combination by adjusting X dimension with either propeller. You can't make one to be like the other though, by raising the X.

The Bravo 1 can typically maintain better efficiency at higher drive heights. This doesn't mean the Hydro isn't as good of a propeller, it just has a different personality and works better in some applications while the Bravo 1 works better in other applications.

Re: Bravo 1 vs Hydromotive
 

The Bravo I is oconsidered a bow lifting design and the original design Hydromotive (Semi-cleavers) are sternlifters.

Julie

Re: Bravo 1 vs Hydromotive
 

SO which would do better in an older heavier boat?

Re: Bravo 1 vs Hydromotive
 

How do ya know which part you need lifted???

Re: Bravo 1 vs Hydromotive
 

VI Mike, Bravo 1.

If the bow drops and the stern feels light at WOT, you need more bow lift.

If slip % raises at WOT, you need bow lift.

There are other examples too.

Call us anytime.

Re: Bravo 1 vs Hydromotive
 

I think I get it know let me go see what happens at WOT :evilb:

Re: Bravo 1 vs Hydromotive
 

Typicaly Deep Vee boats with no steps will run better in Bow Lifting props. Stepped hulls are candidates for stern lifters or bow lifters.

Julie

Re: Bravo 1 vs Hydromotive
 

Well Johno's Renegade ran better with the Hydro's even though he never tested the Bravo's he's running exceptionally well for the power he has. Has anyone ever tried a Bravo and then a Hydro on a concept? If so what were the performance differences?

Re: Bravo 1 vs Hydromotive, Prop testing.
 

I have run both the Bravo 1 and Hydro Quad 1V, and the Hydro 1V-X which is somewhat Bravo 1 like in its design. The only surefire and scientific method to determine the right prop for your application is to test!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Test for the following, and don't be afraid to use a stopwatch.

1. Time to plane.
2. Cavitation while coming on plane.
3. Midrange speed versus rpm (effeciency).
4 Acceleration time (30 - 50) (40 - 70) etc.
5. Turning hold, blowout at various speeds. Both left and right hand turns. Can you feel the blowout coming and is it smooth ar all at once.
6. Top Speed vs RPM. Effeciency.
7. Smoothness.
8. Rough Water holding. Does it loose grip easily when in confused waters.

I know that most people only look at # 6, but the job of a good prop is to provide the best combination of all of the above. If you approach prop testing like race car drivers approach tire testing, you can see how foolish we are to only be concerned with the top speed and nothing else.

DonCig

Re: Bravo 1 vs Hydromotive
 

Nicely said DonCig!

Julie

Re: Bravo 1 vs Hydromotive
 

throttleup have you done any props for the older baja outlaws 24footers I have with 500 plus hp which props work better I have over 600hp in mine

Re: Bravo 1 vs Hydromotive
 

sorry about the I HAVE :rolleyes:

Re: Bravo 1 vs Hydromotive
 

Airtime,
MAtt & Julie hooked me up with a Rev4 23", similar motor specs as yours. Worked great. Allan4 was racing his 24 Outlaw & thats also what he had the best results with & similar HP. The 24 Outlaw needs lots of torque & hp to get her moving.

Re: Bravo 1 vs Hydromotive
 

Airtime,

What year is your hull and what model is the boat?
What power and at what RPM is your peak hP produced?
What drive and gear ratio?
WOT RPM?
WOT MPH via gps?

With this info I should be able to better assist you.

Julie

Re: Bravo 1 vs Hydromotive
 

The Rev 4 is a great alternative for 4BL characteristics in the lower pitch ranges. It also has alot of rake and less diameter which means it can carry the bow better.

It was originally designed with single engine, slightly under powered stern drives in mind. We have found it to work great on all types of applications including some outboards.

Re: Bravo 1 vs Hydromotive
 

Thanks guys

Julie,

I have the unfortunate experiance of owning a Bladerunner 32. It has twin mercury 300x outboards running Bravo 1 28 inch. When I get to around 80mph, the nose of the boat suddenly dives into the water and the rear of the boat tries to go first.

The gearboxes are very low in the water.

I am running the left box on the right and vice versa ( turning in? ) - as advised by the builder.

I am also only seeing 5400RPM on an engine that can get to 6100.

Should I try for the 26 inch props? Bravo 1 ?

Is the boats attempt at suicide due to the props or just bad design?

Is this boat manufactured by Ice Marine or is it Bladerunner out of New Zealand? I have worked with the NZ boats and know a bit about the Ice Marine boat. Either way you obviously have an issue or two. Lets try to get them worked out for you.

Julie
[email protected]

FYI, the Ice Marine boat, that ran here locally had 26P
Bravo I's. But of course we cannot count on the set up of the boats being the same.

Julie

Simple, you have great props already for your type of application. You are turning the propellers the correct way. Labbing the props correctly for the hull will put you at5700 and keep the bow up. However, 300 X's have a higher operating range (6100-6800). This means Labbing a set of 26 Bravo 1's would be a better move than doing the 28's.