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Old 11-08-2017, 02:59 AM   #11
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Extended trim tabs add drag so being all the up should yield top speed. What was the WOT? Is the bottom free of marine growth?
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Old 11-08-2017, 03:08 AM   #12
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WOT showed as ~4550 on the tach. It's being hauled Thursday morning for hull survey/to check the bottom and identify props.
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Old 11-08-2017, 12:29 PM   #13
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Quote:
Originally Posted by codingparadox View Post
WOT showed as ~4550 on the tach. It's being hauled Thursday morning for hull survey/to check the bottom and identify props.
Your WOT is right on are you certain about how you measured speed?
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Old 11-08-2017, 01:09 PM   #14
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I can run 37mph (on a gps) at about the same rpm.
This is at 3600ft elevation though.

So at sea level you should definitely be getting more.

general rule of losing 3% per thousand feet of elevation gain.
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Old 11-08-2017, 04:54 PM   #15
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I can run 37mph (on a gps) at about the same rpm.
This is at 3600ft elevation though.

So at sea level you should definitely be getting more.

general rule of losing 3% per thousand feet of elevation gain.
The OP said he did 30 kt which is 34.5 mph so he is pretty much there.
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Old 11-08-2017, 05:08 PM   #16
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The OP said he did 30 kt which is 34.5 mph so he is pretty much there.
Agree, Mike

Not knowing, I was curious if he would gain 10% +/- over my speed at sea level.

Lots of factors for sure.
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Old 11-08-2017, 07:30 PM   #17
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Measured 30.0 kt with navionics on my iPhone 6S -- dash was showing more like 38 mph, so it's reading a bit high. This is on Lake Washington, which is effectively sea level. If ~35mph is what's expected then we're okay, I'm just reading a bunch of conflicting stuff on various forum posts and boat postings with the same configuration elsewhere.
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