Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: Andy TA on May 09, 2019, 12:38:21 pm
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Ok – Noob question alert !! Please be gentle with me
I have a couple of FE monos that I am about to start building and am collecting stuff for. I would like (eventually) like to race them (at club level) and obviously want to start with something that is heading towards a race set up.
I have searched high and low for info on set up and motors and things, put together loads of kv/rpm spreadsheets and interrogated FE people until their ears bled and am still none the wiser.
Please help before I give up and set light to it all and dance around the flames with a pair of pants on my head.
Mono 1 –
620mm hull length
3s
Mono 2 –
800mm hull length
4s
So lets start with a motor
On 3s the kv x v thing comes out at
38850 rpm with a 3500v motor
At 80% efficiency that gives around 31000 rpm
On 4s the kv x v thing comes out at
38924 rpm with a 2630kv motor
At 80% efficiency that gives around 31000 rpm
All of these seem OK for RPM according to the web people and their calculations
Chatting to the FE people it seems that they are all running 2500kv or less at 3s and 2200kv at 4s
They all seem to have pretty fast boats that run the required 5 mins for a race
What am I missing here? Why are my calcs so much different to theirs?
Andy