Re: [Amel Yacht Owners] Engine RPM vs Boat speed for Amel-Super-Maramu 2000


VLADIMIR SONSEV
 

Joel,
Thanks a lot. I have an original Autoprop.
I will check my tachometer.
I appreciate your help.

On Jan 10, 2016 7:44 PM, "'Joel Potter' jfpottercys@... [amelyachtowners]" <amelyachtowners@...> wrote:
 

Vladimir, with your 75 H.P. engine, if you have a Max-Prop, that speed and RPM are about right, well within the range. If you have an Auto-Prop, the RPM are about 600 slower and that speed is a bit slower than normal by about ½ a knot. All things considered, nothing for concern and within normal ‘range’.

However, keep this in mind. In 35 years of selling used Amel’s by the hundreds, I have NEVER seen a tachometer on an Amel , or any other boat for that matter, after being tested with a certified pulse/stroboscopic tachometer, where the tachometer on the boat was less than 100 RPM too fast or too slow, and many times more than 100 RPM, sometimes a lot more. Tachometers are notoriously inaccurate, especially modern ones which take their information from an electrical pulse from the alternator or other source rather than an engine to tachometer rotating cable. If you are using accurate tide charts and GPS and something does not add up, have your tachometer tested, it’s inexpensive and easy to do so. It is often the culprit.

Have fun with your Amel, Joel

Joel F. Potter/Cruising Yacht Specialist LLC

THE EXPERIENCED AMEL GUY

954 462 5869 office

954 812 2485 cell

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, January 10, 2016 3:27 PM
To: amelyachtowners@...
Subject: Re: [Amel Yacht Owners] Engine RPM vs Boat speed for Amel-Super-Maramu 2000

Joel,

Max RPM is 2900 at 8.2 kn speed.
Is this OK?

On Jan 6, 2016 8:43 AM, "Joel jfpottercys@... jfpottercys@...> [amelyachtowners]" <amelyachtowners@... amelyachtowners@...> > wrote:

Vladimir, how many RPM will your engine develop at maximum and what speed does the boat achieve? What propellor are you using?

Joel F. Potter

THE EXPERIENCED AMEL GUY

954-812-2485 954-812-2485>

On Jan 6, 2016, at 8:15 AM, Vladimir Sonsev sonsev52@... sonsev52@...> [amelyachtowners] <amelyachtowners@... amelyachtowners@...> > wrote:

How many HP in your engine?
My boat was fully loaded.

On Jan 6, 2016 7:32 AM, "Alexandre Uster von Baar uster@... uster@...> [amelyachtowners]" <amelyachtowners@... amelyachtowners@...> > wrote:

Good morning Vladimir,
My speeds were similar, using the Volvo TMD 22.

1400 rpm 4.5 kt
1600 rpm: 5 kt
1800 rpm 5.5 kt

Sincerely, Alexandre
SM2K #289 NIKIMAT
Blue Haven Marina, Turks & Caicos Islands

--------------------------------------------
On Wed, 1/6/16, Vladimir Sonsev sonsev52@... sonsev52@...> [amelyachtowners] <amelyachtowners@... amelyachtowners@...> > wrote:

Subject: [Amel Yacht Owners] Engine RPM vs Boat speed for Amel-Super-Maramu 2000
To: amelyachtowners@... amelyachtowners@...>
Date: Wednesday, January 6, 2016, 5:29 AM

I bought my boat several months
ago. Boat was made in 2002, she has 75 HP Yanmar engine.

I decide to establish my boat performance characteristic. I
tested boat speed at three different engine RPM. My test
results are as follows:
Engine RPM Boat speed in
KN

1500.
4.7

2000.
6.3

2500.
7.5
Boat speed test minimised current or wind
effects. The speed was taking from GPS at maximum stable
speed.

I wonder if those results are as good as expected or not. Do
we have any similar data from Amel?
Vladimir Sonsev

S/V Life is Good

MS345

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