Speed Calculator

[Camps23]

Hi all,
Can someone give me a hand figuring out what speed this boat should run at ?
Also a quick explenation of how the spped calculator functions and where to find one..
Thanks

28.5" Toysport Syncron
AquaCraft Brushless B36 Motor (1800kv) with 5mm Motor Shaft.
Aquacraft 45 amp speed controller
X440 prop
2 turnigy 2s 5000mah 40c batteries

[dana]

My guess is low 40's.

[Diegoboy]

I think 36 MPH
an X642 should see low to mid 40's

[electric]

Yes, I agree with 35mph - 37mph. Bump it up to the x442 and you should see the low 40 -44 or so... By the way, that is a great boat, my brother had one and it turns wonderfully. If they had a simliar design for a lower price point they would sell a ton of them.

[Camps23]

Ya really looking forward to it. I pick I up Wednesday. Im getting the 440 prop and Octura M445.
Would the M445 be ok or to big ?

[electric]

Ya really looking forward to it. I pick I up Wednesday. Im getting the 440 prop and Octura M445.
Would the M445 be ok or to big ?

M445 is not too big for the boat, but too big for your esc. You probably will pull too many amps for it. That said, I have run Super Vee's with that same controller running a M445 for short runs and it worked. Just know that the esc is definitely at risk. You really need like a 120amp esc with the m445 and then you will be in great shape with very high top end(upper 40's - 50).

I have to add, if it is one of those "blue finned" aquacraft esc's, I must say they are work horses and I have abused them for many years with about 5 or so boats (family members) and none of them have given out. They really are the toughest "40amp" esc's I have ever seen. They must be capable of handling way more amps than they state.

[Camps23]

M445 is not too big for the boat, but too big for your esc. You probably will pull too many amps for it. That said, I have run Super Vee's with that same controller running a M445 for short runs and it worked. Just know that the esc is definitely at risk. You really need like a 120amp esc with the m445 and then you will be in great shape with very high top end(upper 40's - 50).

I have to add, if it is one of those "blue finned" aquacraft esc's, I must say they are work horses and I have abused them for many years with about 5 or so boats (family members) and none of them have given out. They really are the toughest "40amp" esc's I have ever seen. They must be cable of handling way more amps than they state.

It is one of the blue finned esc's. The previous owner of the boat ran that prop and esc with no issues.
I plan to pickup a seaking 120a esc first thing anyway. Alot of great advice on this site
Plan is to be in the 50's by end of summer once I get comfortable with
how it runs

[BHChieftain]

Here's a simple speed calc that somebody posted here a while ago, I forgot who developed it...
Chief

[puttekula]

http://www.offshoreelectrics.com/conversion.htm