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hilyert wrote:
I have the same set up 1988 17'Montauk with new 70hp 4 Yamaha. I mounted all the way up. Yes it is quicker, less fuel consummed but you tend to loose any help from you trim and tilt most of the time. on slick water it can run up to 6600 rpms but I think that is too much so I tone it down and try and keep it at 5500
or below. What RPM should I be turning? I also get some secondary spray comming off the transom / prop planed out unless I trim the motor nearly half the way down. I don't know what to make of that.
The heavier the load (people) the more it needs to be trimed down.
The F70 redlines at 6300, and starts dropping ignition / FI cycles at 6450 RPM. So if you're hitting 6600, you are definitely leaving performance on the table - meaning you'll increase your top speed and improve your mileage by going to a different prop.
Tom,
The actual model I have is a PowrTech RED 3R13PYM90.
back on 1/13/12 you replied to me that the RED3 is a good prop which
PowerTech describes as ..... best all purpose prop, similar to Stiletto (Advantage)
I guess I have to amend my opinion. The PowerTech RED3 does not seem to be like the Stiletto Advantage which has no trouble on a Yamaha F70 (or Evinrude E-TEC 90 for that matter) mounted all the way up on a Montauk.
