prop selection
 

MY father has an 87 272 SR1 formula with 2 350's With alpha
drives ( non- counter rotation ) He is currently running 23
pitch cleavers, and would like to upgrage them to either
mirage, mirage plus, or 4-blade bravos. Does anyone have any experiance with prop selection on these particular boats?
I think he would like the midrange and eficiancy of the 4-blades, but I am hoping someone has played around with some props on these boats, any sugestions? He can
spin his 23 cleavers about 4800-4900.

Re: prop selection
 

4 blades will kill the alphas. I would try a 3 blade mirage non plus. Your also spinning the 350's a little high. That era of 350 mags maxed out at 4600rpms.

Re: prop selection
 

Bajarunner, why don't you like the Plus series?

I would try a set of 23 Mirage Plus. They typically have better mid range than the straight Mirage series.

Re: prop selection
 

the 23 mirage plus is kind of what we had in mind, or 24 bravos. I didn't think anything about the bravos being hard on the alpha drives is that something to consider?

Re: prop selection
 

The only reason i say that, is i had a boat just like that setup. twin 26ft baja, 350 mags, twin alphas, non counter. I had the non plus on it, and tried the plus ones. it slowed it down. dont know why?? Now i have a 29 outlaw, same pitch mirages except they are plus. tried some non plus on it and it was about the same. i think my rpms went up a little.

no scientific reason, just figured since i had a similar setup, might be a place to start. I did hear (never tried) that the bravo 1's props eat up alphas, since they cant handle the torque.

Re: prop selection
 

If a boat's running attitude likes the Mirage propeller, they are ussually a little faster on the top than the Plus series. We have seen the Plus's do a little better at cruise though. The differences at either spot are typically minimal.

As always, every identical boat is different.