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MOTION35 10-31-2009 06:08 PM
prop help
 
spectre 36 bravo1 36p looks labbed 5200 rpm mph 113
need 400 more rpms what can I do.

Velocity Vector 10-31-2009 06:55 PM
Originally Posted by MOTION35 (Post 2983200)
spectre 36 bravo1 36p looks labbed 5200 rpm mph 113
need 400 more rpms what can I do.
Buy my 34's they have 2 hrs. on them 800.00 shipped to your door.

MOTION35 11-01-2009 06:12 AM
i have 34 b:coolcowboy:

t500hps 11-01-2009 06:53 AM
I have a set of 32 Bravo's that have been worked a bit getting them closer to 33's. They have added cup and although not labbed I had nearly an inch of the leading edges sharpened somewhat trying to get some more rpm (this left a portion of the blade at stock thickness for strength).....they still didn't work for my application so they are just sitting in the garage. For comparison, they run about 150-200 less rpm's than my labbed 32's. I'll let them go for $650.00

Russ C.

RaggedEdge 11-01-2009 07:56 AM
Originally Posted by t500hps (Post 2983357)
I have a set of 32 Bravo's that have been worked a bit getting them closer to 33's.
Russ C.


What effect did the work have on the RPM? Were they better after the work was done?

HTGMotorsports 11-01-2009 08:19 AM
Originally Posted by MOTION35 (Post 2983352)
i have 34 b:coolcowboy:
What do the 34's do on your boat ?

MOTION35 11-01-2009 11:23 AM
34 b1 112 mph at 5600 rpm

t500hps 11-01-2009 11:53 AM
Originally Posted by RaggedEdge (Post 2983385)
What effect did the work have on the RPM? Were they better after the work was done?

Rpm's really didn't change......added cup reduced rpm a little, sharpening them got that little bit back. The labbed (thinned) 32's I have do get a little more rpm but they are completely diffferent props.....I ended up with some Maximus that were the better all around prop so the Bravos haven't been on the boat much.

HTGMotorsports 11-01-2009 02:49 PM
Originally Posted by MOTION35 (Post 2983463)
34 b1 112 mph at 5600 rpm
It sound to me like your motor is happier at the lower rpm...what makes you think you want rpm's higher...did you dyno? If there is more power at 5600rpm you should go faster...not slower. Your slip is very low...the 36's especially !

MOTION35 11-01-2009 09:33 PM
props
 
My motors pull peak hp 5600 rpm. After 5600 the power comes down. What is my slip at know. :coolcowboy:

HTGMotorsports 11-02-2009 11:32 AM
Your are at 4-5 % with the 36's assuming all your numbers are correct. Maybe try a 34 or 35 5-blade and keep your motor a little under 5600...I think your fairly close...I'm sure your motor makes good power from 5200-5600 so anywhere in that range will be good. Good luck Rob

MOTION35 11-02-2009 10:42 PM
prop
 
that great i'm going out wed more tuning.. wow my slip is there .

Griff 11-02-2009 11:46 PM
Originally Posted by HTGMotorsports (Post 2983959)
Your are at 4-5 % with the 36's assuming all your numbers are correct. Maybe try a 34 or 35 5-blade and keep your motor a little under 5600...I think your fairly close...I'm sure your motor makes good power from 5200-5600 so anywhere in that range will be good. Good luck Rob
Assuming that he has 1.5 ratio drives as well.

Here is a prop slip calculator
http://go-fast.com/Prop_Slip_Calculator.htm

I would just send the 36's to BBlades and tell him what you are looking for.

MOTION35 11-03-2009 10:47 PM
no I have 1.36 gears


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