Quick question

[v6james]

How do you find out the details of a prop ie numbers on it?

What is better plastic or stainless steel?

What is the effects of changing props as in pitch, size etc.

Quite new to all this cheers for the help

 

[Tabes117]

Re: Quick question

Aluminum vs stainless steel. Stainless steel has less flex, better performance. If you hit something an aluminum prop fin will break off, saving your lower unit. Stainless prop fin will not.

Smaller pitch will generally give you more hole shot where a larger pitch will increase your top speed. As a rule every 2" drop in pitch increases your WOT by about 200 RPMs.

 

[v6james]

Re: Quick question

sorry bit slow on tecnical terms what does WOT mean and whole shot mean?

also how do you tell what pitch is of the prop?

 

[v6james]

Re: Quick question

I have 2 props 1 says:

DD QUICKSILVER 48 16988 A5 18P

the other:

HU 13 - 1/4" X 21

whats the difference?

its on a 1500 150hp mercury outboard?

 

[Tabes117]

Re: Quick question

Your quicksilver is a mercury 18 pitch prop, the other is a 21 pitch prop.

Hole shot is quicker acceleration from a stop. WOT is wide open throttle. You do a search on the web for your specific engine, horsepower etc. and find what the RPMs at WOT should be. Then take your boat out for a ride and see what your actual RPMs at WOT. That way you could see if you want to adjust your RPMs up or down. You may be content with the prop you have on there now.

The 18 would be faster from a stop, if you are pulling skiers etc. The 21 would give you more top speed.

 

[steelespike]

Re: Quick question

If you read the helps on the top of the iboats prop store page it will help you.
Selecting a prop is like selecting a single gear in your car to do everything.
Prop material plastic(composite)most look down their noses at them but there have been some very interesting results here with adjustable composite props.(Flotorque)?They are reasonable and apparently can be effective.They are somewhat delicate you can carry a replacement blade.Stainless is very expensive and most will out perform other types .More durable than all others
but more expensive to repair.Aluminum cost less they are effective but generally not exciting.Less delicate than composite and repairable at reasonable prices.The Turning point Rascal and Hustler
Do give stainless performance at Aluminum prices.Generally pitch is the primary consideration when selecting a prop.The diameter will follow based on the application design.