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Re: Prop suggestions

PostPosted: Sun Apr 23, 2017 11:43 am
by HOT PURSUIT
Rule of thumb: 4th blade takes away about 200RPM, moving 1 pitch up or down adds or detracts 200RPM. That's the beauty of ENERTIA, pulls almost as well as a 4 blade :mrgreen:

HP

Re: Prop suggestions

PostPosted: Mon May 22, 2017 10:06 am
by iammarcuse
Have a look at this thread. viewtopic.php?f=14&t=6440
I did a bunch of prop testing and your drive ratio is important to your prop choice. The Volvo drive came in 8 ratios. 1.43, 1.51, 1.60, 1.66, 1.79, 1.89, 1.97, 2.18 You need to find out what ratio you are turning before you start buying props. My guess is it will be a 1.51 or 1.60 but it should say on it somewhere. I would not use an Enertia on anything with a ratio above 1.51. They are small diameter and need to spin fast to work on that boat.

Re: Prop suggestions

PostPosted: Mon May 22, 2017 7:00 pm
by tripvw
I'm running a 19p 3 blade stainless not sure of the brand but I'm hitting rev limiter at 3/4 throttle and running 52mph. I'm thinking about switching to a 21.mine jumps out of the hole but I really want to get closer to 60 or even faster if possible.

Re: Prop suggestions

PostPosted: Mon May 22, 2017 10:06 pm
by iammarcuse
Scoots wrote:Thanks for all the suggestions.

So heres what I got, 4 people and gear on board. 3 blade alum 21p14 1/4? Basically a stock prop but brand new. Decent out of the hole, think I'll need better for heavy skiers and wake boarding. Couldnt get to 5k rpm, best I could get wide out was 4900 and that GPS'd at 53 bouncing off 54. Going to check the throttle linkage this week to make sure im getting WOT. All that being said, if I didnt give a crap about out of the hole and wanted total top speed whats your knee jerk answer?



Here our a few numbers from the thread i posted. I am pretty sure the Volvo is 1.60 which would mean a Tempest or Mirage would get the best top speed. As I said before, the Enertia does best on 1.50 gear ratio. But honestly there is not a whole lot more there over a stock 21 Vengeance. Lose 3 people and you are at 57 mph at over 5000 rpm.

5.7l Mercruiser MPI with 1.50 drive

Props :-----------------21 Vengence-------- ---20 Enertia---------21 Enertia

RPM @ 30 MPH---------------3,000---------------3,150----------------3,100

RPM @ 40 MPH---------------3,750---------------3,900----------------3,800
-
RPM @ 50 MPH---------------4,600---------------4,800----------------4,700

RPM @ WOT------------------5,200---------------5,250----------------5,100

GPS speed WOT--------------58.1----------------57.5-----------------58.7

SPEEDO WOT------------------65------------------64-------------------66


6.2L Mercruiser MPI with 1.65 drive

Props :------------------------20 Enertia-------------22 Enertia-----------21 Vengeance------------21 Mirage

Holeshot---------------------- Excellent --------------Very Good------------Excellent-------------------Very Good

3000 RPM ---------------------27 mph-----------------30 mph---------------31 mph--------------------33 mph

4000 RPM----------------------39 mph-----------------43 mph---------------42.5 mph------------------44 mph

RPM @ WOT-------------------5,400--------------------5100------------------5200----------------------5100
-----------------------------Hit Rev Limiter
GPS speed WOT---------------55.5--------------------57.5------------------58-------------------------60
Speedo reading----------------61-----------------------63---------------------63------------------------- 65

Re: Prop suggestions

PostPosted: Mon May 29, 2017 11:22 am
by HOT PURSUIT
Yup! Thanks iammarcuse! Absolutely correct on drive ratio. Been awhile and I totally forgot that point!

HP

Re: Prop suggestions

PostPosted: Tue May 30, 2017 8:22 am
by AndrewT
iammarcuse wrote:
Scoots wrote:Thanks for all the suggestions.

So heres what I got, 4 people and gear on board. 3 blade alum 21p14 1/4? Basically a stock prop but brand new. Decent out of the hole, think I'll need better for heavy skiers and wake boarding. Couldnt get to 5k rpm, best I could get wide out was 4900 and that GPS'd at 53 bouncing off 54. Going to check the throttle linkage this week to make sure im getting WOT. All that being said, if I didnt give a crap about out of the hole and wanted total top speed whats your knee jerk answer?



Here our a few numbers from the thread i posted. I am pretty sure the Volvo is 1.60 which would mean a Tempest or Mirage would get the best top speed. As I said before, the Enertia does best on 1.50 gear ratio. But honestly there is not a whole lot more there over a stock 21 Vengeance. Lose 3 people and you are at 57 mph at over 5000 rpm.

5.7l Mercruiser MPI with 1.50 drive

Props :-----------------21 Vengence-------- ---20 Enertia---------21 Enertia

RPM @ 30 MPH---------------3,000---------------3,150----------------3,100

RPM @ 40 MPH---------------3,750---------------3,900----------------3,800
-
RPM @ 50 MPH---------------4,600---------------4,800----------------4,700

RPM @ WOT------------------5,200---------------5,250----------------5,100

GPS speed WOT--------------58.1----------------57.5-----------------58.7

SPEEDO WOT------------------65------------------64-------------------66


6.2L Mercruiser MPI with 1.65 drive

Props :------------------------20 Enertia-------------22 Enertia-----------21 Vengeance------------21 Mirage

Holeshot---------------------- Excellent --------------Very Good------------Excellent-------------------Very Good

3000 RPM ---------------------27 mph-----------------30 mph---------------31 mph--------------------33 mph

4000 RPM----------------------39 mph-----------------43 mph---------------42.5 mph------------------44 mph

RPM @ WOT-------------------5,400--------------------5100------------------5200----------------------5100
-----------------------------Hit Rev Limiter
GPS speed WOT---------------55.5--------------------57.5------------------58-------------------------60
Speedo reading----------------61-----------------------63---------------------63------------------------- 65


:worship: