Spetz

Just wondering what prop to buy

It's a Kyosho Bluestreak 800
930mm hull, V type

Motor is a .16, and I added a tune header and pipe (actually for a car but I retrofitted it)
Gonna run about 30% nitro

I got a smaller prop than standard, and it revved too much without speed
And got a much bigger one than standard and it revved too little with no speed
I think the big one was 50mm and the standard is 40mm but not sure of pitch

Also, what's the difference between twin and triple blade props?

Ron Olson

My Feedback: (1)

50mm is way too big for a .16 . You should be using something in the 37-40mm range.

ryan_t888

For a surface driven boat, the prop will aerate during acceleration. This is normal and will dissapear when you get the hull moving on plane.

Ryan

Spetz

I did get a 38mm I think and it just revved heaps but didn't go anywhere


What makes more of an effect? Pitch or diameter?
Also 2 and 3 blade props? What's the difference?

Ron Olson

My Feedback: (1)

Was it cavitating? Try giving it a little toss when launching it. That will help the boat to get up to speed a little easier.

Spetz

What's cavitating?

Ron Olson

My Feedback: (1)

Cavitating/cavitation is when you get air around the prop which won't let it grab water. The engine will rev but not go anywhere.
I've gotten to where I toss all of my boats and those of others. It's more a force of habit now, especially if you've been hosed down a few times by a large mono that the driver is a little trigger happy with.

Spetz

I think it does that a bit but not sure

I just want a prop so that the engine doesn't struggle to rev, but gives me a speed boost

So, what would I do, get more pitch, or get larger diameter?
I am not that interested in acceleration, more the speeds it reaches

glennb2006

Hi Spetz, we all are! But, the prop has to accelerate the boat up to get the best top speed, it is always a compromise and lots of things affect each other.

One prop that may work well on my boat might not run on yours because of different settings, prop depth, strut angle, hull shape all affect how the prop works.

So, the best way is to get some different props and to test and adjust to see what works best for you.

It really is a lot of trial and error.

Glenn

Spetz

I hate trial and error [&o]

glennb2006

Trial and error is what this hobby is all about to get fast. Fear not, you'll get used to it!!

Happy Christmas, maybe Santa will bring you a sack full of props for Christmas!!

Glenn

Spetz

Thanks for the help