Top Speed ?

[jackson2088]

I've had my boat (20012 215 Express Cruiser 5.0L Alpha One) for about a month and in calm water the top speed I've been able to achieve is 34 MPH @ about 5K RPM. Normal speed that it will stay on plain is 23MPH @ 3000-3100 RPM. From reviews I've read say top speed is 47 MPH @ 4800 RPM and cruising speed 37 @ 3600 RPM. I'm sure that is empty however I feel 13 MPH in the top end is a big difference. Is something wrong or is this normal?

 

[JimT]

What is the condition of the bottom of your boat? A dirty bottom can effect performance. If the bottom is clean you should have your prop checked and tuned if needed.

 

[scoflaw]

Checked by GPS?

 

[jackson2088]

Bottom is clean and speed was checked via GPS, top speed was 30kts or 34 mph.

 

[scoflaw]

Undamaged stock prop? Trimmed out till you loose speed?

 

[kaz911]

I've had my boat (20012 215 Express Cruiser 5.0L Alpha One) for about a month and in calm water the top speed I've been able to achieve is 34 MPH @ about 5K RPM. Normal speed that it will stay on plain is 23MPH @ 3000-3100 RPM. From reviews I've read say top speed is 47 MPH @ 4800 RPM and cruising speed 37 @ 3600 RPM. I'm sure that is empty however I feel 13 MPH in the top end is a big difference. Is something wrong or is this normal?

if you are reaching max RPM which it seems @5k RPM - then the PO might have changed the Prop to a lower pitch - or you have prop damage. I don't know the right size for your boat but others here might.

A fouled boat will DECREASE your max RPM.

If PO did a lot of watersports it is quite common to put a lower pitch prop on since it gives you a quicker hole shot so you can pull more skiers.

Find a good Prob dealer who will let you try the different size prop's for your Alpha One so you can get the right one.