First build... Cheap boat, lots of power

[masonis1]

2700kv

[seehuusen]

pitch is distance travelled...

37 x 1.4 x 4mm prop is what I use currently.

so pitch is 37 x 1.4 = 51.8mm per revolution

So in my case, on 3S:
2500 x 11.1 x 51.8mm = 1437450 mm/min = 86.247 km/h (~53.59mph)

And on 4S:
2500 x 14.8 x 51.8mm = 114.996 km/h (~71.46mph)

I recall you saying you had a 42x55 sized prop, from my understanding, 42mm in diameter and 55mm per revolution for pitch (1.25p)
You'd probably get a fair bit of bit with that prop, was it a 2 blade or 3 blade variety?

Comparing mine against yours, if you have a two bladed prop, you should be having a theoretical speed of 98.901 km/h or 60.95mph (with 2700kv motor on 3S)
Hmmm, I do have a smaller prop at home that would net me a higher pitch, with 58mm per revolution, but I doubt that pitch (1.7) is going to be efficient...

Have you tested your top speed with GPS or other?

[masonis1]

I dint have a GPS to test and frankly, I'm scared to get to top speed yet

[srislash]

With pitch and multiple blades comes more amp draw.2 blade prop pulling 80 amps,the same 3 blade prop will pull 120.

[masonis1]

What really is the point of a 3 blade

[srislash]

More bite on take off or out of the corners. The 1:1's use 5blades because they are hopping in and out of water.

[masonis1]

If I had a 3 blade I'd have more torque twist and steer then I already have...

[seehuusen]

thanks for the amp draw info srislash, that's really good info! :)

It is my understanding, with more blades comes less slippage, offering more bite/torque as well as better high-end speed
The ideal prop has one blade... obviously these are fairly hard to balance LOL

Your torque twist could probably be eliminated by a longer rudder?

[srislash]

A three blade is usually slower than a two.There are frictional forces at work.Did you know that a drag boats prop is hot at the end of a run.

[seehuusen]

Really!!!! I did not know that, LOL that's crazy...

[masonis1]

That's cool info

[masonis1]

Seasons coming around, can't wait to see my little boat but idk about the miss geico, maybe sell???

[izcain]

Hey Mason been awhile since I was on here since I got busy with some things. Looks like you really revamped the ol girl. Looked really nice on the runs minus the dog coming loose.

[masonis1]

Yup, kinda depressing but she isn't fixed yet!

[masonis1]

Ran it not too long ago- I had an extra brushless from my short course truck and threw it in- it's a 3600kv lrp x20 10.5t motor. On 2s it's perfect- perfect speed and it handles it and the motor never got warm after 15 minutes of going around the pond. On 3s it's stupid fast and I pulled it out before I could do any damage! On 2s it's just a tad slower than the 2700 on 3s and I couldn't be happier with it now. The miss Gieco is for sale now and I'm Hoping to sell it and get a 1/10 or 1/8 race buggy so I have something just for racing and my other trucks for bashing.
I'm happy with this little boat! A blast and it handles like a dream.