Mirage Props Blowout/cavatation
12-18-2002 | 09:29 AM
#21
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Joined: Oct 2002
Posts: 263
Likes: 11
From: nowhere
Jayl13
I have a 272 SR-1 formula with twin 330's putting out 350hp with 25p Mirages turning tops in.
If I trim tabs and drives full down and push throttles up to 3000 RPM's and leave them there. I can't trim the drives and tabs fast enough to keep the bow of the boat from digging in.
You need to get some prop work done in a serious way.
Sounds like Houstonprop is on the right track.
Oh BTW I top out 1/2 tank of gas and 3 adults runs 71.5 on GPS.
Hope that gives you some #'s to work with.
I was thinking that the Formula is also heavier so your #'s should be better
I have a 272 SR-1 formula with twin 330's putting out 350hp with 25p Mirages turning tops in.
If I trim tabs and drives full down and push throttles up to 3000 RPM's and leave them there. I can't trim the drives and tabs fast enough to keep the bow of the boat from digging in.
You need to get some prop work done in a serious way.
Sounds like Houstonprop is on the right track.
Oh BTW I top out 1/2 tank of gas and 3 adults runs 71.5 on GPS.
Hope that gives you some #'s to work with.
I was thinking that the Formula is also heavier so your #'s should be better
12-18-2002 | 11:21 AM
#22
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Joined: Jun 2002
Posts: 374
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From: waterford,mi
houstin
Darin, I believe merc says 4800-5000, the tests I've read seem to be running best at the upper end.
Just don't want to be up against the limiter, 5000 would be good
then on a cold day it would still hit 5100
thanks.... john
Just don't want to be up against the limiter, 5000 would be good
then on a cold day it would still hit 5100
thanks.... john
12-19-2002 | 12:15 AM
#23
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Joined: Jul 2002
Posts: 1,387
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From: Houston,texas
Re: Re: houston I need lift off...
Originally posted by HOUSTONPROP
Fountain27ho496, where exactly do you want the RPM's to be at WOT. Let me know I can dial you in.
Fountain27ho496, where exactly do you want the RPM's to be at WOT. Let me know I can dial you in.
sorryI am so short but I have had a16 hr day so far and not done yet. you can call thursday if you like .
Last edited by HOUSTONPROP; 12-19-2002 at 12:32 AM.
12-19-2002 | 12:29 AM
#24
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From: Houston,texas
Originally posted by OPIE272
Jayl13
I have a 272 SR-1 formula with twin 330's putting out 350hp with 25p Mirages turning tops in.
If I trim tabs and drives full down and push throttles up to 3000 RPM's and leave them there. I can't trim the drives and tabs fast enough to keep the bow of the boat from digging in.
You need to get some prop work done in a serious way.
Sounds like Houstonprop is on the right track.
Oh BTW I top out 1/2 tank of gas and 3 adults runs 71.5 on GPS.
Hope that gives you some #'s to work with.
I was thinking that the Formula is also heavier so your #'s should be better
Jayl13
I have a 272 SR-1 formula with twin 330's putting out 350hp with 25p Mirages turning tops in.
If I trim tabs and drives full down and push throttles up to 3000 RPM's and leave them there. I can't trim the drives and tabs fast enough to keep the bow of the boat from digging in.
You need to get some prop work done in a serious way.
Sounds like Houstonprop is on the right track.
Oh BTW I top out 1/2 tank of gas and 3 adults runs 71.5 on GPS.
Hope that gives you some #'s to work with.
I was thinking that the Formula is also heavier so your #'s should be better
Happy Holiday!!!!!!!
HAPPY HOLIDAYS EVERYONE!!!!!!
12-21-2002 | 11:26 AM
#30
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Joined: Oct 2002
Posts: 1,053
Likes: 0
From: DFW, Texas
Kind of off topic but....
Darrin,
What's your thoughts on the finish of the prop; polished or satin? The assumption I've had (based on others opinions) is that polished perform better because the are smooth (and of course they look good). I've recently heard that a satin finish actually perform better.
So, if you labbed 2 of the exact sames props in the same application and give one a polished finish and the other a satin finish, besides appearance, what differences might there be?
What's your thoughts on the finish of the prop; polished or satin? The assumption I've had (based on others opinions) is that polished perform better because the are smooth (and of course they look good). I've recently heard that a satin finish actually perform better.
So, if you labbed 2 of the exact sames props in the same application and give one a polished finish and the other a satin finish, besides appearance, what differences might there be?
