excursion

After a long winter project too re-build my HP500's,in the 37 Active Thunder, got some time on them today with 5 different sets of props.

1) 30 stock bravo's,"not new" 5800rpm 87.4mph

2) 31 work bravo's "from Throttle Up" 5500&5800/ 78mph
Something was terrible wrong with on of these props had major slip out of the hole and one ran 400 rpm more than the other.

3) 32 stock bravo's "new" 5550 rpm 86.8 mph

4) 33 labbed Mercury "new" 5600 rpm 87.2mph

5) 30 Mercury 5 Blades "new" 5300rpm 84mph


Over all the Stock 32's were the best, cruise was up by 3 mph and hole shot great.

The 5 blades were 6 mph faster at 3000rpm than the 32's

Going to have my 30's worked into 31's and should be the perfect setup.

Any suggestion's??

excursion

The 31's were not mine, I borrowed them from a friend, I have told him what I noticed when running them. He is going to try them on his boat first, to see if any difference.

I am sure they will fix them, they are great people.
I will be sending mine to them as well.

ATPatrick

JAmes,

You normally spinning those engines that high?

Pat

t500hps

Yeah, take me next time

excursion

Hey Pat,.....No to answer your question, my peak horsepower will be at 5600 rpm, just trying to take in account for the rpm loss I will have for the summer heat, It was only 55 today and no humidity, when the summer humidity and 90 degree day I will easy loose 200/300 rpm. So I think a nice pair of worked 30's will be perfect.

Pure Energy

What was your speed @ 3000 rpm with the 5 blades? 6 mph over 4 blades, that would be great. How much HP?

excursion

Yes, the 5 Blades at 3000rpm were 6 mph faster over the 32 bravo's and 8 mph over the 30 bravo's. We estimate them to have about 585hp. Another AT with 525EFI's tried the samr props and could barely get 5000rpm, so I spun them 300rpm more. Very hard shifting into gear, they are a huge prop.

Pure Energy

Do you have XR drives? I would like to increase my cruise but I have 1990 Bravos, motors are 640 hp and I would be afraid the drives would explode!!

excursion

No, I have regular Bravo's, and that is what I have heard with the 5 blades that they bite so hard that if they leave the water and on re-entry are busting drives, dont want any part of that.

docmanrich37

James I have my set of XZ uppers with 6 hrs. on them for sale if needed.Those set of 30's you tried are for sale if anyone is interested.They are 5 blades.I'm going to call Matt & Julie today to get mine set cut for the rpms i need.