prop selection
07-01-2005, 04:11 PM
#11
Re: prop selection
Tested a 23 mirage plus last night. I lost 4mph on top end, and midrange felt like it suffered also. I have come to the conclusion that I have a tach problem, and was turning my 25 a little harder than I thought. I calibrated my tach up against a digital snap-on timing light that I know to be accurate, however I only tested it up to around 3,500 or so rpm's.
I am thinking that my tach may have an issue in the higher
rpm range. I am going to test it this weekend up to 5,200
or so. If I calculate the prop slip with either of the two props it comes out to less than 1% ( which I know cannot be correct) Which is part of what leads me to belive that I am turning more rpm's than I thought (which is a good problem
to have!) I am thanful for guys like Ready2go, and Magnum27
that let me come down last night and try their props out, because I was about to just buy a 23 mirage, and I would have been a sick puppy if I had!! THANKS GUYS!!!! I am thinking more along the lines of a labbed 25 now, but I would still like to try a 4 blade. I should know a little more after the weekend.
I am thinking that my tach may have an issue in the higher
rpm range. I am going to test it this weekend up to 5,200
or so. If I calculate the prop slip with either of the two props it comes out to less than 1% ( which I know cannot be correct) Which is part of what leads me to belive that I am turning more rpm's than I thought (which is a good problem
to have!) I am thanful for guys like Ready2go, and Magnum27
that let me come down last night and try their props out, because I was about to just buy a 23 mirage, and I would have been a sick puppy if I had!! THANKS GUYS!!!! I am thinking more along the lines of a labbed 25 now, but I would still like to try a 4 blade. I should know a little more after the weekend.
07-01-2005, 04:41 PM
#12
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Location: Huntersville, NC
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Re: prop selection
wow that is surprising -- i'm running a TRS drive as well -- labbed 25p mirage turned down to a 24 -- and i can only get 5000 rpms MAX.
I need to be at 5400 - 5600 -- i would think a 23p would be perfect for me
I wonder why the differences?
I need to be at 5400 - 5600 -- i would think a 23p would be perfect for me
I wonder why the differences?
07-03-2005, 11:51 PM
#13
Re: prop selection
Just got home from the lake. I definatly had a tach problem
at 4,400 on my tach I am actually turning 4,800. With my 25
tempest plus It consistantly ran 68 on the GPS, the highest I seen was 68.2. Which at 4,800 RPM's puts my prop slip right at 10% . I would still like to try a couple more props, but as of now I think my best bet is going to be a labbed 25, and hope for around 5,100 or so. I am not for shure whether I would
be best getting my 25 tempest+ labbed or going with a labbed mirage. I would really like to try a 25 mirage to see how it compares to my 25 tempest+. Has any one out there had
any experiances with a labbed prop at these RPM & speed ranges ifso how much speed did you pick up,(I know most people advertise 2-3 mph) But what have you guys seen.
If anyone has some props in my range that they would consider getting rid of please let me know.
at 4,400 on my tach I am actually turning 4,800. With my 25
tempest plus It consistantly ran 68 on the GPS, the highest I seen was 68.2. Which at 4,800 RPM's puts my prop slip right at 10% . I would still like to try a couple more props, but as of now I think my best bet is going to be a labbed 25, and hope for around 5,100 or so. I am not for shure whether I would
be best getting my 25 tempest+ labbed or going with a labbed mirage. I would really like to try a 25 mirage to see how it compares to my 25 tempest+. Has any one out there had
any experiances with a labbed prop at these RPM & speed ranges ifso how much speed did you pick up,(I know most people advertise 2-3 mph) But what have you guys seen.
If anyone has some props in my range that they would consider getting rid of please let me know.
07-05-2005, 02:21 PM
#15
Charter Member
Charter Member
Re: prop selection
I have a 24" pitch 15.5 diameter hydromotive 3 blade for $250 + shipping. It used to get me to 76gps at 5500+ rpms with the 500hp and 71 speedo with the 400hp at 4900, If you are interested. I think the shipping would be an additional $15 Chris
Last edited by IRONMAN; 07-05-2005 at 02:23 PM. Reason: add
Gold Member
07-09-2005, 02:20 PM
#17
Charter Member
Charter Member
Re: prop selection
I found that the TRS, Transmission and lower X made no measureable difference when I changed to bravo. But I have not completely dialed in the new setup yet.
