Elevation and power

Keta · 02-25-2010, 10:10 AM

My boat, a 21' Striper with a 302, is slugish at 4000' plus and I have trouble getting it on plane. I have 2 props that put me just above and just below the proper rpm and it still takes shifting weight forward and droping the outdrive fully down to get on plane so I don't think it's a prop issue.

I haven't had the money to take my boat to the coast so here's my question. Will my boat have more power at sea level or do I have to re power to get it to work like it should.

StickFish · 02-25-2010, 10:50 AM

You will have more power at sea level. With my current prop, my boat runs great at or near sea level. At 5,000' I need to drop down in size and pitch to make up for the lower amount of o2 in the air. You might need to re-prop or watch your rpms in the ocean depends.

Keta · 02-25-2010, 11:02 AM

Quote:

Originally Posted by StickFish

You will have more power at sea level. With my current prop, my boat runs great at or near sea level. At 5,000' I need to drop down in size and pitch to make up for the lower amount of o2 in the air. You might need to re-prop or watch your rpms in the ocean depends.

I realy need to take her over to the coast and get tuna blood on her.

Mooch · 02-25-2010, 03:48 PM

For every 1000' of elevation a naturally aspirated gas engine looses about 3% of its power.

At 4000'+ you're down 12% or more.