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Just so that you all know
Posted: Sat Oct 04, 2014 9:34 pm
by Mike Killay
On the weekend I tested a 1983 Mariner 2 hp on flat water in a cutting off the Thames.
It developed a bollard pull of 50 lbs.
Re: Just so that you all know
Posted: Sat Oct 04, 2014 10:09 pm
by Niander101
DO a test with a seagull?
Re: Just so that you all know
Posted: Sun Oct 05, 2014 5:50 am
by Collector Inspector
Yes!
There should be more of this type of testing.
B
Re: Just so that you all know
Posted: Sun Oct 05, 2014 2:08 pm
by Adrian Dale
Change the pitch/diameter of the prop and change the bollard pull.. there are many variables in this type of testing
AJ
Re: Just so that you all know
Posted: Sun Oct 05, 2014 4:42 pm
by Charles uk
Exactly AJ.
If you attach a rev counter to your motor when your doing your bollard pull, you will see significantly less revs than when the hull is running free, it's a reasonable assumption that less revs equal less power.
Perhaps that's why Seagull's spring balance was built into a special transom bracket, so it could measure the push when the hull was running free, which would give a more accurate reading.
Though the static bollard pull might be closer to the truth with a 4 : 1 gearbox.
Re: Just so that you all know
Posted: Mon Oct 06, 2014 12:09 am
by Mike Killay
Adrian Dale wrote:Change the pitch/diameter of the prop and change the bollard pull.. there are many variables in this type of testing
AJ
Is that why the featherweight is only quoted at 45lbs, but the same engine with 40 plus leg is quoted at 55lbs?