My Rio EP Brushless conversion

[Brushless55]

My temps were fine, battery wasn't hot at all but the motor and ESC got warm not so hot I couldn't touch them and hold my fingers there. I wouldn't mind going down a size but I tried the 31 and 34mm props from Hobbycity and they just won't push it on plane or get much speed. Can you guys give me a link to a couple of smaller props with higher pitches. maybe even a 3 blade prop that would work. I don't want to burn anything out but I want speed!!

I wouldn't mind a smaller prop but the one's I have just dont cut it right now.

Going smaller on the prop would get you less speed and harder out of the hole

[hyrulejedi86]

Well, I definetly don't want less speed! Alot of people were just saying that the 42 was probably to big and I don't want to mess anything up if it were to big.

[Brushless55]

A 38-40mm would be good, possibly even a 36mm may get the job done..

[hyrulejedi86]

Can you suggest one with a pitch similar to the Rio Ep stock, or how do I find out what the pitch is so I can get the right one the first time, hopefully! :)

[hyrulejedi86]

I was just thinking, if I wanted to switch to a 3 blade prop how would I adjust the size if I found that a 38mm 2 blade prop worked?

[SweetZ28]

Hi a smaller prop may get you faster speed i learned this ...if your motor is high RPM ...like yours 39,600RPM on your 3s battery that's very high mine is 30,500RPM on 3S and i used a 31.5mm and it flew I am going to try a 29mm.
With your set up if it is doing the RPM it supposed to be and is a good motor I say go smaller prop. what size is the hole in your props? i use 3/16" props carbon fiber ones i grind down the 40MM size to what i like.
Did you see my video?

[hyrulejedi86]

I did see your video it looks really fast!

I tried a 31mm from hobbycity but it wouldn't get on plane or get going at a good speed at all!

That's why I tried the stock prop which did amazing. I think maybe if I had a smaller prop with a higher pitch it might work better but I don't know where to start. The flex shaft is 3mm in size so that's what the hole in the prop has to be as well.

[SweetZ28]

I did see your video it looks really fast!

I tried a 31mm from hobbycity but it wouldn't get on plane or get going at a good speed at all!

That's why I tried the stock prop which did amazing. I think maybe if I had a smaller prop with a higher pitch it might work better but I don't know where to start. The flex shaft is 3mm in size so that's what the hole in the prop has to be as well.

Those props probably are no good ...if there plastic it probably flexed like crazy at that RPM and made it not grab the water and push...I used a plastic 30 something MM prop and it just sat there cavatating!
The carbon fiber stuff don't flex...

[SweetZ28]

Hi go here on the top try these props they should fit your boat.....i would get a 35 and 32mm and maybe the next size smaller ... a note on these get a razor blade and hold it on a angle and scrape around the whole back of each blad to make the 2 blades sharp ...I got 2MPH more by doing this on a fiberglass prop.

http://www.offshoreelectrics.com/products.php?cat=119

[SweetZ28]

Here is how you sharpen by scraping with razor or exacto blade.

[Brushless55]

Hi a smaller prop may get you faster speed i learned this ...if your motor is high RPM ...like yours 39,600RPM on your 3s battery that's very high mine is 30,500RPM on 3S and i used a 31.5mm and it flew I am going to try a 29mm.
With your set up if it is doing the RPM it supposed to be and is a good motor I say go smaller prop. what size is the hole in your props? i use 3/16" props carbon fiber ones i grind down the 40MM size to what i like.
Did you see my video?

Going smaller and smaller does not mean faster and faster speeds
you will get to a point that the prop does much of nothing for your boat going with a smaller prop

[Brushless55]

Can you suggest one with a pitch similar to the Rio Ep stock, or how do I find out what the pitch is so I can get the right one the first time, hopefully! :)

you have a lot or rpm so you don't really need alot of pitch..
it's all about trial and error in picking the right prop

so far your doing real good!

[SweetZ28]

Going smaller and smaller does not mean faster and faster speeds
you will get to a point that the prop does much of nothing for your boat going with a smaller prop

Yes but there is only one way of finding this out and its testing I tested bigger props and smaller then smaller and smaller ones but not the smallest made my boat faster than with a bigger prop because my boats motor never got up to full RPM with a big prop.
He just has to test a few props ...I think the small plastic ones did no good as they flexed badly due to his hight RPMs and if he runs the same size in fiber glass, metal,or Carbon fiber it will work much different than those cheapo Hobbyking plastic props... That's my thoughts.

[Brushless55]

Yes but there is only one way of finding this out and its testing I tested bigger props and smaller then smaller and smaller ones but not the smallest made my boat faster than with a bigger prop because my boats motor never got up to full RPM with a big prop.
He just has to test a few props ...I think the small plastic ones did no good as they flexed badly due to his hight RPMs and if he runs the same size in fiber glass, metal,or Carbon fiber it will work much different than those cheapo Hobbyking plastic props... That's my thoughts.

this is a mono hull and the tiny props do not do that well
and with any prop change one needs to make an adjustment to the strut to get the most out of the prop

[mr.gunner]

Hello,

I'm new here and I'll be receiving my boat within a few days.

I've got a plan to modify my boat and looking into the same motor as you. My question is that do you need to change the motor coupler to the one you mentioned? or, the stock coupler can fit the new motor properly.

I'm from Thailand and sorry for my bad English.